A virtual class subclassed for each graphics driver FLTK uses. More...

#include <Fl_Device.H>

Inheritance diagram for Fl_Graphics_Driver:

Classes
struct	matrix
	A 2D coordinate transformation matrix. More...

Public Member Functions
virtual const char *	class_name ()
	Returns the name of the class of this object. More...

Fl_Color	color ()
	see fl_color(void).

virtual int	descent ()
	see fl_descent(). More...

virtual int	draw_scaled (Fl_Image *img, int X, int Y, int W, int H)
	Draws an Fl_Image scaled to width `W` & height `H` with top-left corner at X,Y. More...

Fl_Font	font ()
	see fl_font(void).

virtual void	font (Fl_Font face, Fl_Fontsize fsize)
	see fl_font(Fl_Font face, Fl_Fontsize size). More...

Fl_Font_Descriptor *	font_descriptor ()
	Returns a pointer to the current Fl_Font_Descriptor for the graphics driver.

void	font_descriptor (Fl_Font_Descriptor *d)
	Sets the current Fl_Font_Descriptor for the graphics driver.

virtual int	height ()
	see fl_height(). More...

Fl_Fontsize	size ()
	see fl_size().

virtual void	text_extents (const char *, int n, int &dx, int &dy, int &w, int &h)
	see fl_text_extents(const char*, int n, int& dx, int& dy, int& w, int& h). More...

virtual double	width (const char *str, int n)
	see fl_width(const char *str, int n). More...

virtual double	width (unsigned int c)
	see fl_width(unsigned int n). More...

virtual	~Fl_Graphics_Driver ()
	The destructor.

Public Member Functions inherited from Fl_Device
virtual const char *	class_name ()
	Returns the name of the class of this object. More...

virtual	~Fl_Device ()
	Virtual destructor. More...

Static Public Attributes
static const char *	class_id = "Fl_Graphics_Driver"

Static Public Attributes inherited from Fl_Device
static const char *	class_id = "Fl_Device"
	A string that identifies each subclass of Fl_Device. More...

Protected Member Functions
virtual void	arc (double x, double y, double r, double start, double end)
	see fl_arc(double x, double y, double r, double start, double end). More...

virtual void	arc (int x, int y, int w, int h, double a1, double a2)
	see fl_arc(int x, int y, int w, int h, double a1, double a2). More...

virtual void	begin_complex_polygon ()
	see fl_begin_complex_polygon(). More...

virtual void	begin_line ()
	see fl_begin_line(). More...

virtual void	begin_loop ()
	see fl_begin_loop(). More...

virtual void	begin_points ()
	see fl_begin_points(). More...

virtual void	begin_polygon ()
	see fl_begin_polygon(). More...

virtual void	circle (double x, double y, double r)
	see fl_circle(double x, double y, double r). More...

virtual int	clip_box (int x, int y, int w, int h, int &X, int &Y, int &W, int &H)
	see fl_clip_box(int x, int y, int w, int h, int &X, int &Y, int &W, int &H). More...

Fl_Region	clip_region ()
	see fl_clip_region().

void	clip_region (Fl_Region r)
	see fl_clip_region(Fl_Region r).

virtual void	color (Fl_Color c)
	see fl_color(Fl_Color c). More...

virtual void	color (uchar r, uchar g, uchar b)
	see fl_color(uchar r, uchar g, uchar b). More...

virtual void	copy_offscreen (int x, int y, int w, int h, Fl_Offscreen pixmap, int srcx, int srcy)
	see fl_copy_offscreen() More...

virtual void	curve (double X0, double Y0, double X1, double Y1, double X2, double Y2, double X3, double Y3)
	see fl_curve(double X0, double Y0, double X1, double Y1, double X2, double Y2, double X3, double Y3). More...

virtual void	draw (const char *str, int n, int x, int y)
	see fl_draw(const char *str, int n, int x, int y). More...

virtual void	draw (Fl_Bitmap *bm, int XP, int YP, int WP, int HP, int cx, int cy)
	Draws an Fl_Bitmap object to the device. More...

virtual void	draw (Fl_Pixmap *pxm, int XP, int YP, int WP, int HP, int cx, int cy)
	Draws an Fl_Pixmap object to the device. More...

virtual void	draw (Fl_RGB_Image *rgb, int XP, int YP, int WP, int HP, int cx, int cy)
	Draws an Fl_RGB_Image object to the device. More...

virtual void	draw (int angle, const char *str, int n, int x, int y)
	see fl_draw(int angle, const char *str, int n, int x, int y). More...

virtual void	draw_image (const uchar *buf, int X, int Y, int W, int H, int D=3, int L=0)
	see fl_draw_image(const uchar* buf, int X,int Y,int W,int H, int D, int L). More...

virtual void	draw_image (Fl_Draw_Image_Cb cb, void *data, int X, int Y, int W, int H, int D=3)
	see fl_draw_image(Fl_Draw_Image_Cb cb, void* data, int X,int Y,int W,int H, int D). More...

virtual void	draw_image_mono (const uchar *buf, int X, int Y, int W, int H, int D=1, int L=0)
	see fl_draw_image_mono(const uchar* buf, int X,int Y,int W,int H, int D, int L). More...

virtual void	draw_image_mono (Fl_Draw_Image_Cb cb, void *data, int X, int Y, int W, int H, int D=1)
	see fl_draw_image_mono(Fl_Draw_Image_Cb cb, void* data, int X,int Y,int W,int H, int D). More...

virtual void	end_complex_polygon ()
	see fl_end_complex_polygon(). More...

virtual void	end_line ()
	see fl_end_line(). More...

virtual void	end_loop ()
	see fl_end_loop(). More...

virtual void	end_points ()
	see fl_end_points(). More...

virtual void	end_polygon ()
	see fl_end_polygon(). More...

	Fl_Graphics_Driver ()
	The constructor.

virtual void	gap ()
	see fl_gap(). More...

virtual void	line (int x, int y, int x1, int y1)
	see fl_line(int x, int y, int x1, int y1). More...

virtual void	line (int x, int y, int x1, int y1, int x2, int y2)
	see fl_line(int x, int y, int x1, int y1, int x2, int y2). More...

virtual void	line_style (int style, int width=0, char *dashes=0)
	see fl_line_style(int style, int width, char* dashes). More...

virtual void	loop (int x0, int y0, int x1, int y1, int x2, int y2)
	see fl_loop(int x0, int y0, int x1, int y1, int x2, int y2). More...

virtual void	loop (int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3)
	see fl_loop(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3). More...

void	mult_matrix (double a, double b, double c, double d, double x, double y)
	see fl_mult_matrix(double a, double b, double c, double d, double x, double y).

virtual int	not_clipped (int x, int y, int w, int h)
	see fl_not_clipped(int x, int y, int w, int h). More...

virtual void	pie (int x, int y, int w, int h, double a1, double a2)
	see fl_pie(int x, int y, int w, int h, double a1, double a2). More...

virtual void	point (int x, int y)
	see fl_point(int x, int y). More...

virtual void	polygon (int x0, int y0, int x1, int y1, int x2, int y2)
	see fl_polygon(int x0, int y0, int x1, int y1, int x2, int y2). More...

virtual void	polygon (int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3)
	see fl_polygon(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3). More...

virtual void	pop_clip ()
	see fl_pop_clip(). More...

void	pop_matrix ()
	see fl_pop_matrix().

virtual void	push_clip (int x, int y, int w, int h)
	see fl_push_clip(int x, int y, int w, int h). More...

void	push_matrix ()
	see fl_push_matrix().

virtual void	push_no_clip ()
	see fl_push_no_clip(). More...

virtual void	rect (int x, int y, int w, int h)
	see fl_rect(int x, int y, int w, int h). More...

virtual void	rectf (int x, int y, int w, int h)
	see fl_rectf(int x, int y, int w, int h). More...

void	restore_clip ()
	see fl_restore_clip().

void	rotate (double d)
	see fl_rotate(double d).

virtual void	rtl_draw (const char *str, int n, int x, int y)
	see fl_rtl_draw(const char *str, int n, int x, int y). More...

void	scale (double x)
	see fl_scale(double x).

void	scale (double x, double y)
	see fl_scale(double x, double y).

double	transform_dx (double x, double y)
	see fl_transform_dx(double x, double y).

double	transform_dy (double x, double y)
	see fl_transform_dy(double x, double y).

double	transform_x (double x, double y)
	see fl_transform_x(double x, double y).

double	transform_y (double x, double y)
	see fl_transform_y(double x, double y).

virtual void	transformed_vertex (double xf, double yf)
	see fl_transformed_vertex(double xf, double yf). More...

void	translate (double x, double y)
	see fl_translate(double x, double y).

virtual void	vertex (double x, double y)
	see fl_vertex(double x, double y). More...

virtual void	xyline (int x, int y, int x1)
	see fl_xyline(int x, int y, int x1). More...

virtual void	xyline (int x, int y, int x1, int y2)
	see fl_xyline(int x, int y, int x1, int y2). More...

virtual void	xyline (int x, int y, int x1, int y2, int x3)
	see fl_xyline(int x, int y, int x1, int y2, int x3). More...

virtual void	yxline (int x, int y, int y1)
	see fl_yxline(int x, int y, int y1). More...

virtual void	yxline (int x, int y, int y1, int x2)
	see fl_yxline(int x, int y, int y1, int x2). More...

virtual void	yxline (int x, int y, int y1, int x2, int y3)
	see fl_yxline(int x, int y, int y1, int x2, int y3). More...

Protected Attributes
matrix *	fl_matrix
	Points to the current coordinate transformation matrix.

Friends
void	fl_arc (double x, double y, double r, double start, double end)
	Adds a series of points to the current path on the arc of a circle. More...

void	fl_arc (int x, int y, int w, int h, double a1, double a2)
	Draw ellipse sections using integer coordinates. More...

void	fl_begin_complex_polygon ()
	Starts drawing a complex filled polygon. More...

void	fl_begin_line ()
	Starts drawing a list of lines.

void	fl_begin_loop ()
	Starts drawing a closed sequence of lines.

void	fl_begin_points ()
	Starts drawing a list of points. More...

void	fl_begin_polygon ()
	Starts drawing a convex filled polygon.

class	Fl_Bitmap

void	fl_circle (double x, double y, double r)
	fl_circle() is equivalent to fl_arc(x,y,r,0,360), but may be faster. More...

int	fl_clip_box (int x, int y, int w, int h, int &X, int &Y, int &W, int &H)
	Intersects the rectangle with the current clip region and returns the bounding box of the result. More...

Fl_Region	fl_clip_region ()
	Returns the current clipping region.

void	fl_clip_region (Fl_Region r)
	Replaces the top of the clipping stack with a clipping region of any shape. More...

void	fl_color (Fl_Color c)
	Sets the color for all subsequent drawing operations. More...

void	fl_color (uchar r, uchar g, uchar b)
	Sets the color for all subsequent drawing operations. More...

FL_EXPORT void	fl_copy_offscreen (int x, int y, int w, int h, Fl_Offscreen pixmap, int srcx, int srcy)
	Copy a rectangular area of the given offscreen buffer into the current drawing destination. More...

void	fl_curve (double X0, double Y0, double X1, double Y1, double X2, double Y2, double X3, double Y3)
	Adds a series of points on a Bezier curve to the path. More...

void	fl_draw (const char *str, int n, int x, int y)
	Draws starting at the given `x`, `y` location a UTF-8 string of length `n` bytes.

void	fl_draw (int angle, const char *str, int n, int x, int y)
	Draws at the given `x`, `y` location a UTF-8 string of length `n` bytes rotating `angle` degrees counter-clockwise. More...

void	fl_draw_image (const uchar *buf, int X, int Y, int W, int H, int D, int L)
	Draws an 8-bit per color RGB or luminance image. More...

void	fl_draw_image (Fl_Draw_Image_Cb cb, void *data, int X, int Y, int W, int H, int D)
	Draws an image using a callback function to generate image data. More...

void	fl_draw_image_mono (const uchar *buf, int X, int Y, int W, int H, int D, int L)
	Draws a gray-scale (1 channel) image. More...

FL_EXPORT void	fl_draw_image_mono (Fl_Draw_Image_Cb cb, void *data, int X, int Y, int W, int H, int D)
	Draws a gray-scale image using a callback function to generate image data. More...

void	fl_end_complex_polygon ()
	Ends complex filled polygon, and draws.

void	fl_end_line ()
	Ends list of lines, and draws.

void	fl_end_loop ()
	Ends closed sequence of lines, and draws.

void	fl_end_points ()
	Ends list of points, and draws.

void	fl_end_polygon ()
	Ends convex filled polygon, and draws.

void	fl_font (Fl_Font face, Fl_Fontsize size)
	Sets the current font, which is then used in various drawing routines. More...

void	fl_gap ()
	Call fl_gap() to separate loops of the path. More...

void	fl_line (int x, int y, int x1, int y1)
	Draws a line from (x,y) to (x1,y1)

void	fl_line (int x, int y, int x1, int y1, int x2, int y2)
	Draws a line from (x,y) to (x1,y1) and another from (x1,y1) to (x2,y2)

void	fl_line_style (int style, int width, char *dashes)
	Sets how to draw lines (the "pen"). More...

void	fl_loop (int x0, int y0, int x1, int y1, int x2, int y2)
	Outlines a 3-sided polygon with lines.

void	fl_loop (int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3)
	Outlines a 4-sided polygon with lines.

void	fl_mult_matrix (double a, double b, double c, double d, double x, double y)
	Concatenates another transformation onto the current one. More...

int	fl_not_clipped (int x, int y, int w, int h)
	Does the rectangle intersect the current clip region? More...

void	fl_pie (int x, int y, int w, int h, double a1, double a2)
	Draw filled ellipse sections using integer coordinates. More...

class	Fl_Pixmap

void	fl_point (int x, int y)
	Draws a single pixel at the given coordinates.

void	fl_polygon (int x0, int y0, int x1, int y1, int x2, int y2)
	Fills a 3-sided polygon. More...

void	fl_polygon (int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3)
	Fills a 4-sided polygon. More...

void	fl_pop_clip ()
	Restores the previous clip region. More...

void	fl_pop_matrix ()
	Restores the current transformation matrix from the stack.

void	fl_push_clip (int x, int y, int w, int h)
	Intersects the current clip region with a rectangle and pushes this new region onto the stack. More...

void	fl_push_matrix ()
	Saves the current transformation matrix on the stack. More...

void	fl_push_no_clip ()
	Pushes an empty clip region onto the stack so nothing will be clipped.

void	fl_rect (int x, int y, int w, int h)
	Draws a 1-pixel border inside the given bounding box. More...

void	fl_rectf (int x, int y, int w, int h)
	Colors with current color a rectangle that exactly fills the given bounding box.

void	fl_restore_clip ()
	Undoes any clobbering of clip done by your program.

class	Fl_RGB_Image

void	fl_rotate (double d)
	Concatenates rotation transformation onto the current one. More...

void	fl_rtl_draw (const char *str, int n, int x, int y)
	Draws a UTF-8 string of length `n` bytes right to left starting at the given `x`, `y` location.

void	fl_scale (double x)
	Concatenates scaling transformation onto the current one. More...

void	fl_scale (double x, double y)
	Concatenates scaling transformation onto the current one. More...

double	fl_transform_dx (double x, double y)
	Transforms distance using current transformation matrix. More...

double	fl_transform_dy (double x, double y)
	Transforms distance using current transformation matrix. More...

double	fl_transform_x (double x, double y)
	Transforms coordinate using the current transformation matrix. More...

double	fl_transform_y (double x, double y)
	Transforms coordinate using the current transformation matrix. More...

void	fl_transformed_vertex (double xf, double yf)
	Adds coordinate pair to the vertex list without further transformations. More...

void	fl_translate (double x, double y)
	Concatenates translation transformation onto the current one. More...

void	fl_vertex (double x, double y)
	Adds a single vertex to the current path. More...

void	fl_xyline (int x, int y, int x1)
	Draws a horizontal line from (x,y) to (x1,y)

void	fl_xyline (int x, int y, int x1, int y2)
	Draws a horizontal line from (x,y) to (x1,y), then vertical from (x1,y) to (x1,y2)

void	fl_xyline (int x, int y, int x1, int y2, int x3)
	Draws a horizontal line from (x,y) to (x1,y), then a vertical from (x1,y) to (x1,y2) and then another horizontal from (x1,y2) to (x3,y2)

void	fl_yxline (int x, int y, int y1)
	Draws a vertical line from (x,y) to (x,y1)

void	fl_yxline (int x, int y, int y1, int x2)
	Draws a vertical line from (x,y) to (x,y1), then a horizontal from (x,y1) to (x2,y1)

void	fl_yxline (int x, int y, int y1, int x2, int y3)
	Draws a vertical line from (x,y) to (x,y1) then a horizontal from (x,y1) to (x2,y1), then another vertical from (x2,y1) to (x2,y3)

FL_EXPORT void	gl_start ()
	Creates an OpenGL context.

Detailed Description

A virtual class subclassed for each graphics driver FLTK uses.

Typically, FLTK applications do not use directly objects from this class. Rather, they perform drawing operations (e.g., fl_rectf()) that operate on the current drawing surface (see Fl_Surface_Device). Drawing operations are functionally presented in Drawing Things in FLTK and as function lists in the Drawing functions and Color & Font functions modules. The fl_graphics_driver global variable gives at any time the graphics driver used by all drawing operations. Its value changes when drawing operations are directed to another drawing surface by Fl_Surface_Device::set_current().

The Fl_Graphics_Driver class is of interest if one wants to perform new kinds of drawing operations. An example would be to draw to a PDF file. This would involve creating a new Fl_Graphics_Driver derived class. This new class should implement all virtual methods of the Fl_Graphics_Driver class to support all FLTK drawing functions.

Member Function Documentation

◆ arc() [1/2]

void Fl_Graphics_Driver::arc	(	double	x,
		double	y,
		double	r,
		double	start,
		double	end
	)

protectedvirtual

see fl_arc(double x, double y, double r, double start, double end).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ arc() [2/2]

void Fl_Graphics_Driver::arc	(	int	x,
		int	y,
		int	w,
		int	h,
		double	a1,
		double	a2
	)

protectedvirtual

see fl_arc(int x, int y, int w, int h, double a1, double a2).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ begin_complex_polygon()

void Fl_Graphics_Driver::begin_complex_polygon ( )

protectedvirtual

see fl_begin_complex_polygon().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ begin_line()

void Fl_Graphics_Driver::begin_line ( )

protectedvirtual

see fl_begin_line().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ begin_loop()

void Fl_Graphics_Driver::begin_loop ( )

protectedvirtual

see fl_begin_loop().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ begin_points()

void Fl_Graphics_Driver::begin_points ( )

protectedvirtual

see fl_begin_points().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ begin_polygon()

void Fl_Graphics_Driver::begin_polygon ( )

protectedvirtual

see fl_begin_polygon().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ circle()

void Fl_Graphics_Driver::circle	(	double	x,
		double	y,
		double	r
	)

protectedvirtual

see fl_circle(double x, double y, double r).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ class_name()

virtual const char * Fl_Graphics_Driver::class_name ( )

inlinevirtual

Returns the name of the class of this object.

Use of the class_name() function is discouraged because it will be removed from future FLTK versions.

The class of an instance of an Fl_Device subclass can be checked with code such as:

if ( instance->class_name() == Fl_Printer::class_id ) { ... }

Reimplemented from Fl_Device.

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_GDI_Printer_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ clip_box()

int Fl_Graphics_Driver::clip_box	(	int	x,
		int	y,
		int	w,
		int	h,
		int &	X,
		int &	Y,
		int &	W,
		int &	H
	)

protectedvirtual

see fl_clip_box(int x, int y, int w, int h, int &X, int &Y, int &W, int &H).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ color() [1/2]

virtual void Fl_Graphics_Driver::color ( Fl_Color c )

inlineprotectedvirtual

see fl_color(Fl_Color c).

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ color() [2/2]

virtual void Fl_Graphics_Driver::color	(	uchar	r,
		uchar	g,
		uchar	b
	)

inlineprotectedvirtual

see fl_color(uchar r, uchar g, uchar b).

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ copy_offscreen()

void Fl_Graphics_Driver::copy_offscreen	(	int	x,
		int	y,
		int	w,
		int	h,
		Fl_Offscreen	pixmap,
		int	srcx,
		int	srcy
	)

protectedvirtual

see fl_copy_offscreen()

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, and Fl_Xlib_Graphics_Driver.

◆ curve()

void Fl_Graphics_Driver::curve	(	double	X0,
		double	Y0,
		double	X1,
		double	Y1,
		double	X2,
		double	Y2,
		double	X3,
		double	Y3
	)

protectedvirtual

see fl_curve(double X0, double Y0, double X1, double Y1, double X2, double Y2, double X3, double Y3).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ descent()

virtual int Fl_Graphics_Driver::descent ( )

inlinevirtual

see fl_descent().

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ draw() [1/5]

virtual void Fl_Graphics_Driver::draw	(	const char *	str,
		int	n,
		int	x,
		int	y
	)

inlineprotectedvirtual

see fl_draw(const char *str, int n, int x, int y).

Reimplemented in Fl_PostScript_Graphics_Driver, Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, and Fl_Xlib_Graphics_Driver.

◆ draw() [2/5]

virtual void Fl_Graphics_Driver::draw	(	Fl_Bitmap *	bm,
		int	XP,
		int	YP,
		int	WP,
		int	HP,
		int	cx,
		int	cy
	)

inlineprotectedvirtual

Draws an Fl_Bitmap object to the device.

Specifies a bounding box for the image, with the origin (upper left-hand corner) of the image offset by the cx and cy arguments.

Reimplemented in Fl_PostScript_Graphics_Driver, Fl_GDI_Printer_Graphics_Driver, Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, and Fl_Xlib_Graphics_Driver.

◆ draw() [3/5]

virtual void Fl_Graphics_Driver::draw	(	Fl_Pixmap *	pxm,
		int	XP,
		int	YP,
		int	WP,
		int	HP,
		int	cx,
		int	cy
	)

inlineprotectedvirtual

Draws an Fl_Pixmap object to the device.

Specifies a bounding box for the image, with the origin (upper left-hand corner) of the image offset by the cx and cy arguments.

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_GDI_Printer_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ draw() [4/5]

virtual void Fl_Graphics_Driver::draw	(	Fl_RGB_Image *	rgb,
		int	XP,
		int	YP,
		int	WP,
		int	HP,
		int	cx,
		int	cy
	)

inlineprotectedvirtual

Draws an Fl_RGB_Image object to the device.

Specifies a bounding box for the image, with the origin (upper left-hand corner) of the image offset by the cx and cy arguments.

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ draw() [5/5]

virtual void Fl_Graphics_Driver::draw	(	int	angle,
		const char *	str,
		int	n,
		int	x,
		int	y
	)

inlineprotectedvirtual

see fl_draw(int angle, const char *str, int n, int x, int y).

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ draw_image() [1/2]

virtual void Fl_Graphics_Driver::draw_image	(	const uchar *	buf,
		int	X,
		int	Y,
		int	W,
		int	H,
		int	D = `3`,
		int	L = `0`
	)

inlineprotectedvirtual

see fl_draw_image(const uchar* buf, int X,int Y,int W,int H, int D, int L).

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ draw_image() [2/2]

virtual void Fl_Graphics_Driver::draw_image	(	Fl_Draw_Image_Cb	cb,
		void *	data,
		int	X,
		int	Y,
		int	W,
		int	H,
		int	D = `3`
	)

inlineprotectedvirtual

see fl_draw_image(Fl_Draw_Image_Cb cb, void* data, int X,int Y,int W,int H, int D).

Reimplemented in Fl_PostScript_Graphics_Driver, Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, and Fl_Xlib_Graphics_Driver.

◆ draw_image_mono() [1/2]

virtual void Fl_Graphics_Driver::draw_image_mono	(	const uchar *	buf,
		int	X,
		int	Y,
		int	W,
		int	H,
		int	D = `1`,
		int	L = `0`
	)

inlineprotectedvirtual

see fl_draw_image_mono(const uchar* buf, int X,int Y,int W,int H, int D, int L).

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ draw_image_mono() [2/2]

virtual void Fl_Graphics_Driver::draw_image_mono	(	Fl_Draw_Image_Cb	cb,
		void *	data,
		int	X,
		int	Y,
		int	W,
		int	H,
		int	D = `1`
	)

inlineprotectedvirtual

see fl_draw_image_mono(Fl_Draw_Image_Cb cb, void* data, int X,int Y,int W,int H, int D).

Reimplemented in Fl_PostScript_Graphics_Driver, Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, and Fl_Xlib_Graphics_Driver.

◆ draw_scaled()

int Fl_Graphics_Driver::draw_scaled	(	Fl_Image *	img,
		int	X,
		int	Y,
		int	W,
		int	H
	)

virtual

Draws an Fl_Image scaled to width W & height H with top-left corner at X,Y.

Returns: zero when the graphics driver doesn't implement scaled drawing, non-zero if it does implement it.

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Printer_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ end_complex_polygon()

void Fl_Graphics_Driver::end_complex_polygon ( )

protectedvirtual

see fl_end_complex_polygon().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ end_line()

void Fl_Graphics_Driver::end_line ( )

protectedvirtual

see fl_end_line().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ end_loop()

void Fl_Graphics_Driver::end_loop ( )

protectedvirtual

see fl_end_loop().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ end_points()

void Fl_Graphics_Driver::end_points ( )

protectedvirtual

see fl_end_points().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ end_polygon()

void Fl_Graphics_Driver::end_polygon ( )

protectedvirtual

see fl_end_polygon().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ font()

virtual void Fl_Graphics_Driver::font	(	Fl_Font	face,
		Fl_Fontsize	fsize
	)

inlinevirtual

see fl_font(Fl_Font face, Fl_Fontsize size).

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ gap()

void Fl_Graphics_Driver::gap ( )

protectedvirtual

see fl_gap().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ height()

virtual int Fl_Graphics_Driver::height ( )

inlinevirtual

see fl_height().

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ line() [1/2]

void Fl_Graphics_Driver::line	(	int	x,
		int	y,
		int	x1,
		int	y1
	)

protectedvirtual

see fl_line(int x, int y, int x1, int y1).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ line() [2/2]

void Fl_Graphics_Driver::line	(	int	x,
		int	y,
		int	x1,
		int	y1,
		int	x2,
		int	y2
	)

protectedvirtual

see fl_line(int x, int y, int x1, int y1, int x2, int y2).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ line_style()

void Fl_Graphics_Driver::line_style	(	int	style,
		int	width = `0`,
		char *	dashes = `0`
	)

protectedvirtual

see fl_line_style(int style, int width, char* dashes).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ loop() [1/2]

void Fl_Graphics_Driver::loop	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		int	x2,
		int	y2
	)

protectedvirtual

see fl_loop(int x0, int y0, int x1, int y1, int x2, int y2).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ loop() [2/2]

void Fl_Graphics_Driver::loop	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		int	x2,
		int	y2,
		int	x3,
		int	y3
	)

protectedvirtual

see fl_loop(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ not_clipped()

int Fl_Graphics_Driver::not_clipped	(	int	x,
		int	y,
		int	w,
		int	h
	)

protectedvirtual

see fl_not_clipped(int x, int y, int w, int h).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ pie()

void Fl_Graphics_Driver::pie	(	int	x,
		int	y,
		int	w,
		int	h,
		double	a1,
		double	a2
	)

protectedvirtual

see fl_pie(int x, int y, int w, int h, double a1, double a2).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ point()

void Fl_Graphics_Driver::point	(	int	x,
		int	y
	)

protectedvirtual

see fl_point(int x, int y).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ polygon() [1/2]

void Fl_Graphics_Driver::polygon	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		int	x2,
		int	y2
	)

protectedvirtual

see fl_polygon(int x0, int y0, int x1, int y1, int x2, int y2).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ polygon() [2/2]

void Fl_Graphics_Driver::polygon	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		int	x2,
		int	y2,
		int	x3,
		int	y3
	)

protectedvirtual

see fl_polygon(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ pop_clip()

void Fl_Graphics_Driver::pop_clip ( )

protectedvirtual

see fl_pop_clip().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ push_clip()

void Fl_Graphics_Driver::push_clip	(	int	x,
		int	y,
		int	w,
		int	h
	)

protectedvirtual

see fl_push_clip(int x, int y, int w, int h).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ push_no_clip()

void Fl_Graphics_Driver::push_no_clip ( )

protectedvirtual

see fl_push_no_clip().

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ rect()

void Fl_Graphics_Driver::rect	(	int	x,
		int	y,
		int	w,
		int	h
	)

protectedvirtual

see fl_rect(int x, int y, int w, int h).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ rectf()

void Fl_Graphics_Driver::rectf	(	int	x,
		int	y,
		int	w,
		int	h
	)

protectedvirtual

see fl_rectf(int x, int y, int w, int h).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ rtl_draw()

virtual void Fl_Graphics_Driver::rtl_draw	(	const char *	str,
		int	n,
		int	x,
		int	y
	)

inlineprotectedvirtual

see fl_rtl_draw(const char *str, int n, int x, int y).

Reimplemented in Fl_PostScript_Graphics_Driver, Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, and Fl_Xlib_Graphics_Driver.

◆ text_extents()

void Fl_Graphics_Driver::text_extents	(	const char *	t,
		int	n,
		int &	dx,
		int &	dy,
		int &	w,
		int &	h
	)

virtual

see fl_text_extents(const char*, int n, int& dx, int& dy, int& w, int& h).

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ transformed_vertex()

void Fl_Graphics_Driver::transformed_vertex	(	double	xf,
		double	yf
	)

protectedvirtual

see fl_transformed_vertex(double xf, double yf).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ vertex()

void Fl_Graphics_Driver::vertex	(	double	x,
		double	y
	)

protectedvirtual

see fl_vertex(double x, double y).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ width() [1/2]

virtual double Fl_Graphics_Driver::width	(	const char *	str,
		int	n
	)

inlinevirtual

see fl_width(const char *str, int n).

Reimplemented in Fl_PostScript_Graphics_Driver, Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, and Fl_Xlib_Graphics_Driver.

◆ width() [2/2]

virtual double Fl_Graphics_Driver::width ( unsigned int c )

inlinevirtual

see fl_width(unsigned int n).

Reimplemented in Fl_Quartz_Graphics_Driver, Fl_GDI_Graphics_Driver, Fl_Xlib_Graphics_Driver, and Fl_PostScript_Graphics_Driver.

◆ xyline() [1/3]

void Fl_Graphics_Driver::xyline	(	int	x,
		int	y,
		int	x1
	)

protectedvirtual

see fl_xyline(int x, int y, int x1).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ xyline() [2/3]

void Fl_Graphics_Driver::xyline	(	int	x,
		int	y,
		int	x1,
		int	y2
	)

protectedvirtual

see fl_xyline(int x, int y, int x1, int y2).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ xyline() [3/3]

void Fl_Graphics_Driver::xyline	(	int	x,
		int	y,
		int	x1,
		int	y2,
		int	x3
	)

protectedvirtual

see fl_xyline(int x, int y, int x1, int y2, int x3).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ yxline() [1/3]

void Fl_Graphics_Driver::yxline	(	int	x,
		int	y,
		int	y1
	)

protectedvirtual

see fl_yxline(int x, int y, int y1).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ yxline() [2/3]

void Fl_Graphics_Driver::yxline	(	int	x,
		int	y,
		int	y1,
		int	x2
	)

protectedvirtual

see fl_yxline(int x, int y, int y1, int x2).

Reimplemented in Fl_PostScript_Graphics_Driver.

◆ yxline() [3/3]

void Fl_Graphics_Driver::yxline	(	int	x,
		int	y,
		int	y1,
		int	x2,
		int	y3
	)

protectedvirtual

see fl_yxline(int x, int y, int y1, int x2, int y3).

Reimplemented in Fl_PostScript_Graphics_Driver.

Friends And Related Function Documentation

◆ fl_arc [1/2]

void fl_arc	(	double	x,
		double	y,
		double	r,
		double	start,
		double	end
	)

friend

Adds a series of points to the current path on the arc of a circle.

You can get elliptical paths by using scale and rotate before calling fl_arc().

Parameters

[in]	x,y,r	center and radius of circular arc
[in]	start,end	angles of start and end of arc measured in degrees counter-clockwise from 3 o'clock. If `end` is less than `start` then it draws the arc in a clockwise direction.

Examples:

// Draw an arc of points
fl_begin_points();
fl_arc(100.0, 100.0, 50.0, 0.0, 180.0);
fl_end_points();
 
// Draw arc with a line
fl_begin_line();
fl_arc(200.0, 100.0, 50.0, 0.0, 180.0);
fl_end_line();
 
// Draw filled arc
fl_begin_polygon();
fl_arc(300.0, 100.0, 50.0, 0.0, 180.0);
fl_end_polygon();

◆ fl_arc [2/2]

void fl_arc	(	int	x,
		int	y,
		int	w,
		int	h,
		double	a1,
		double	a2
	)

friend

Draw ellipse sections using integer coordinates.

These functions match the rather limited circle drawing code provided by X and WIN32. The advantage over using fl_arc with floating point coordinates is that they are faster because they often use the hardware, and they draw much nicer small circles, since the small sizes are often hard-coded bitmaps.

If a complete circle is drawn it will fit inside the passed bounding box. The two angles are measured in degrees counter-clockwise from 3 o'clock and are the starting and ending angle of the arc, a2 must be greater or equal to a1.

fl_arc() draws a series of lines to approximate the arc. Notice that the integer version of fl_arc() has a different number of arguments than the double version fl_arc(double x, double y, double r, double start, double end)

Parameters

[in]	x,y,w,h	bounding box of complete circle
[in]	a1,a2	start and end angles of arc measured in degrees counter-clockwise from 3 o'clock. `a2` must be greater than or equal to `a1`.

◆ fl_begin_complex_polygon

void fl_begin_complex_polygon ( )

friend

Starts drawing a complex filled polygon.

The polygon may be concave, may have holes in it, or may be several disconnected pieces. Call fl_gap() to separate loops of the path.

To outline the polygon, use fl_begin_loop() and replace each fl_gap() with fl_end_loop();fl_begin_loop() pairs.

Note: For portability, you should only draw polygons that appear the same whether "even/odd" or "non-zero" winding rules are used to fill them. Holes should be drawn in the opposite direction to the outside loop.

◆ fl_begin_points

void fl_begin_points ( )

friend

Starts drawing a list of points.

Points are added to the list with fl_vertex()

◆ fl_circle

void fl_circle	(	double	x,
		double	y,
		double	r
	)

friend

fl_circle() is equivalent to fl_arc(x,y,r,0,360), but may be faster.

It must be the only thing in the path: if you want a circle as part of a complex polygon you must use fl_arc()

Parameters

[in] x,y,r center and radius of circle

◆ fl_clip_box

int fl_clip_box	(	int	x,
		int	y,
		int	w,
		int	h,
		int &	X,
		int &	Y,
		int &	W,
		int &	H
	)

friend

Intersects the rectangle with the current clip region and returns the bounding box of the result.

Returns non-zero if the resulting rectangle is different to the original. This can be used to limit the necessary drawing to a rectangle. W and H are set to zero if the rectangle is completely outside the region.

Parameters

[in]	x,y,w,h	position and size of rectangle
[out]	X,Y,W,H	position and size of resulting bounding box.

Returns: Non-zero if the resulting rectangle is different to the original.

◆ fl_clip_region

void fl_clip_region ( Fl_Region r )

friend

Replaces the top of the clipping stack with a clipping region of any shape.

Fl_Region is an operating system specific type.

Parameters

[in] r clipping region

◆ fl_color [1/2]

void fl_color ( Fl_Color c )

friend

Sets the color for all subsequent drawing operations.

For colormapped displays, a color cell will be allocated out of fl_colormap the first time you use a color. If the colormap fills up then a least-squares algorithm is used to find the closest color. If no valid graphical context (fl_gc) is available, the foreground is not set for the current window.

Parameters

[in] c color

◆ fl_color [2/2]

void fl_color	(	uchar	r,
		uchar	g,
		uchar	b
	)

friend

Sets the color for all subsequent drawing operations.

The closest possible match to the RGB color is used. The RGB color is used directly on TrueColor displays. For colormap visuals the nearest index in the gray ramp or color cube is used. If no valid graphical context (fl_gc) is available, the foreground is not set for the current window.

Parameters

[in] r,g,b color components

◆ fl_copy_offscreen

FL_EXPORT void fl_copy_offscreen	(	int	x,
		int	y,
		int	w,
		int	h,
		Fl_Offscreen	pixmap,
		int	srcx,
		int	srcy
	)

friend

Copy a rectangular area of the given offscreen buffer into the current drawing destination.

Parameters

x,y	position where to draw the copied rectangle
w,h	size of the copied rectangle
pixmap	offscreen buffer containing the rectangle to copy
srcx,srcy	origin in offscreen buffer of rectangle to copy

◆ fl_curve

void fl_curve	(	double	X0,
		double	Y0,
		double	X1,
		double	Y1,
		double	X2,
		double	Y2,
		double	X3,
		double	Y3
	)

friend

Adds a series of points on a Bezier curve to the path.

The curve ends (and two of the points) are at X0,Y0 and X3,Y3.

Parameters

[in]	X0,Y0	curve start point
[in]	X1,Y1	curve control point
[in]	X2,Y2	curve control point
[in]	X3,Y3	curve end point

◆ fl_draw

void fl_draw	(	int	angle,
		const char *	str,
		int	n,
		int	x,
		int	y
	)

friend

Draws at the given x, y location a UTF-8 string of length n bytes rotating angle degrees counter-clockwise.

Note: When using X11 (Unix, Linux, Cygwin et al.) this needs Xft to work. Under plain X11 (w/o Xft) rotated text is not supported by FLTK. A warning will be issued to stderr at runtime (only once) if you use this method with an angle other than 0.

◆ fl_draw_image [1/2]

void fl_draw_image	(	const uchar *	buf,
		int	X,
		int	Y,
		int	W,
		int	H,
		int	D = `3`,
		int	L = `0`
	)

friend

Draws an 8-bit per color RGB or luminance image.

Parameters

[in]	buf	points at the "r" data of the top-left pixel. Color data must be in `r,g,b` order. Luminance data is only one `gray` byte.
[in]	X,Y	position where to put top-left corner of image
[in]	W,H	size of the image
[in]	D	delta to add to the pointer between pixels. It may be any value greater than or equal to 1, or it can be negative to flip the image horizontally
[in]	L	delta to add to the pointer between lines (if 0 is passed it uses `W` * `D`), and may be larger than `W` * `D` to crop data, or negative to flip the image vertically

It is highly recommended that you put the following code before the first show() of any window in your program to get rid of the dithering if possible:

Fl::visual(FL_RGB);

Fl::visual

static int visual(int)

Selects a visual so that your graphics are drawn correctly.

Definition: Fl_visual.cxx:118

Gray scale (1-channel) images may be drawn. This is done if abs(D) is less than 3, or by calling fl_draw_image_mono(). Only one 8-bit sample is used for each pixel, and on screens with different numbers of bits for red, green, and blue only gray colors are used. Setting D greater than 1 will let you display one channel of a color image.

Note:: The X version does not support all possible visuals. If FLTK cannot draw the image in the current visual it will abort. FLTK supports any visual of 8 bits or less, and all common TrueColor visuals up to 32 bits.

◆ fl_draw_image [2/2]

void fl_draw_image	(	Fl_Draw_Image_Cb	cb,
		void *	data,
		int	X,
		int	Y,
		int	W,
		int	H,
		int	D = `3`
	)

friend

Draws an image using a callback function to generate image data.

You can generate the image as it is being drawn, or do arbitrary decompression of stored data, provided it can be decompressed to individual scan lines easily.

Parameters

[in]	cb	callback function to generate scan line data
[in]	data	user data passed to callback function
[in]	X,Y	screen position of top left pixel
[in]	W,H	image width and height
[in]	D	data size in bytes (must be greater than 0)

See also: fl_draw_image(const uchar* buf, int X,int Y,int W,int H, int D, int L)

The callback function cb is called with the void* data user data pointer to allow access to a structure of information about the image, and the x, y, and w of the scan line desired from the image. 0,0 is the upper-left corner of the image, not x, y. A pointer to a buffer to put the data into is passed. You must copy w pixels from scanline y, starting at pixel x, to this buffer.

Due to cropping, less than the whole image may be requested. So x may be greater than zero, the first y may be greater than zero, and w may be less than W. The buffer is long enough to store the entire W * D pixels, this is for convenience with some decompression schemes where you must decompress the entire line at once: decompress it into the buffer, and then if x is not zero, copy the data over so the x'th pixel is at the start of the buffer.

You can assume the y's will be consecutive, except the first one may be greater than zero.

If D is 4 or more, you must fill in the unused bytes with zero.

◆ fl_draw_image_mono [1/2]

void fl_draw_image_mono	(	const uchar *	buf,
		int	X,
		int	Y,
		int	W,
		int	H,
		int	D = `1`,
		int	L = `0`
	)

friend

Draws a gray-scale (1 channel) image.

See also: fl_draw_image(const uchar* buf, int X,int Y,int W,int H, int D, int L)

◆ fl_draw_image_mono [2/2]

FL_EXPORT void fl_draw_image_mono	(	Fl_Draw_Image_Cb	cb,
		void *	data,
		int	X,
		int	Y,
		int	W,
		int	H,
		int	D = `1`
	)

friend

Draws a gray-scale image using a callback function to generate image data.

See also: fl_draw_image(Fl_Draw_Image_Cb cb, void* data, int X,int Y,int W,int H, int D)

◆ fl_font

void fl_font	(	Fl_Font	face,
		Fl_Fontsize	size
	)

friend

Sets the current font, which is then used in various drawing routines.

You may call this outside a draw context if necessary to call fl_width(), but on X this will open the display.

The font is identified by a face and a size. The size of the font is measured in pixels and not "points". Lines should be spaced size pixels apart or more.

◆ fl_gap

void fl_gap ( )

friend

Call fl_gap() to separate loops of the path.

It is unnecessary but harmless to call fl_gap() before the first vertex, after the last vertex, or several times in a row.

◆ fl_line_style

void fl_line_style	(	int	style,
		int	width = `0`,
		char *	dashes = `0`
	)

friend

Sets how to draw lines (the "pen").

If you change this it is your responsibility to set it back to the default using fl_line_style(0).

Parameters

[in]	style	A bitmask which is a bitwise-OR of a line style, a cap style, and a join style. If you don't specify a dash type you will get a solid line. If you don't specify a cap or join type you will get a system-defined default of whatever value is fastest.
[in]	width	The thickness of the lines in pixels. Zero results in the system defined default, which on both X and Windows is somewhat different and nicer than 1.
[in]	dashes	A pointer to an array of dash lengths, measured in pixels. The first location is how long to draw a solid portion, the next is how long to draw the gap, then the solid, etc. It is terminated with a zero-length entry. A `NULL` pointer or a zero-length array results in a solid line. Odd array sizes are not supported and result in undefined behavior.

Note: Because of how line styles are implemented on Win32 systems, you must set the line style after setting the drawing color. If you set the color after the line style you will lose the line style settings.; The dashes array does not work under Windows 95, 98 or Me, since those operating systems do not support complex line styles.

◆ fl_mult_matrix

void fl_mult_matrix	(	double	a,
		double	b,
		double	c,
		double	d,
		double	x,
		double	y
	)

friend

Concatenates another transformation onto the current one.

Parameters

[in] a,b,c,d,x,y transformation matrix elements such that X' = aX + cY + x and Y' = bX +dY + y

◆ fl_not_clipped

int fl_not_clipped	(	int	x,
		int	y,
		int	w,
		int	h
	)

friend

Does the rectangle intersect the current clip region?

Parameters

[in] x,y,w,h position and size of rectangle

Returns: non-zero if any of the rectangle intersects the current clip region. If this returns 0 you don't have to draw the object.

Note: Under X this returns 2 if the rectangle is partially clipped, and 1 if it is entirely inside the clip region.

◆ fl_pie

void fl_pie	(	int	x,
		int	y,
		int	w,
		int	h,
		double	a1,
		double	a2
	)

friend

Draw filled ellipse sections using integer coordinates.

Like fl_arc(), but fl_pie() draws a filled-in pie slice. This slice may extend outside the line drawn by fl_arc(); to avoid this use w - 1 and h - 1.

Parameters

[in]	x,y,w,h	bounding box of complete circle
[in]	a1,a2	start and end angles of arc measured in degrees counter-clockwise from 3 o'clock. `a2` must be greater than or equal to `a1`.

◆ fl_polygon [1/2]

void fl_polygon	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		int	x2,
		int	y2
	)

friend

Fills a 3-sided polygon.

The polygon must be convex.

◆ fl_polygon [2/2]

void fl_polygon	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		int	x2,
		int	y2,
		int	x3,
		int	y3
	)

friend

Fills a 4-sided polygon.

The polygon must be convex.

◆ fl_pop_clip

void fl_pop_clip ( )

friend

Restores the previous clip region.

You must call fl_pop_clip() once for every time you call fl_push_clip(). Unpredictable results may occur if the clip stack is not empty when you return to FLTK.

◆ fl_push_clip

void fl_push_clip	(	int	x,
		int	y,
		int	w,
		int	h
	)

friend

Intersects the current clip region with a rectangle and pushes this new region onto the stack.

Parameters

[in] x,y,w,h position and size

◆ fl_push_matrix

void fl_push_matrix ( )

friend

Saves the current transformation matrix on the stack.

The maximum depth of the stack is 32.

◆ fl_rect

void fl_rect	(	int	x,
		int	y,
		int	w,
		int	h
	)

friend

Draws a 1-pixel border inside the given bounding box.

This function is meant for quick drawing of simple boxes. The behavior is undefined for line widths that are not 1.

◆ fl_rotate

void fl_rotate ( double d )

friend

Concatenates rotation transformation onto the current one.

Parameters

[in] d - rotation angle, counter-clockwise in degrees (not radians)

◆ fl_scale [1/2]

void fl_scale ( double x )

friend

Concatenates scaling transformation onto the current one.

Parameters

[in] x scale factor in both x-direction and y-direction

◆ fl_scale [2/2]

void fl_scale	(	double	x,
		double	y
	)

friend

Concatenates scaling transformation onto the current one.

Parameters

[in] x,y scale factors in x-direction and y-direction

◆ fl_transform_dx

double fl_transform_dx	(	double	x,
		double	y
	)

friend

Transforms distance using current transformation matrix.

Parameters

[in] x,y coordinate

◆ fl_transform_dy

double fl_transform_dy	(	double	x,
		double	y
	)

friend

Transforms distance using current transformation matrix.

Parameters

[in] x,y coordinate

◆ fl_transform_x

double fl_transform_x	(	double	x,
		double	y
	)

friend

Transforms coordinate using the current transformation matrix.

Parameters

[in] x,y coordinate

◆ fl_transform_y

double fl_transform_y	(	double	x,
		double	y
	)

friend

Transforms coordinate using the current transformation matrix.

Parameters

[in] x,y coordinate

◆ fl_transformed_vertex

void fl_transformed_vertex	(	double	xf,
		double	yf
	)

friend

Adds coordinate pair to the vertex list without further transformations.

Parameters

[in] xf,yf transformed coordinate

◆ fl_translate

void fl_translate	(	double	x,
		double	y
	)

friend

Concatenates translation transformation onto the current one.

Parameters

[in] x,y translation factor in x-direction and y-direction

◆ fl_vertex

void fl_vertex	(	double	x,
		double	y
	)

friend

Adds a single vertex to the current path.

Parameters

[in] x,y coordinate

The documentation for this class was generated from the following files:

Classes

Public Member Functions

Static Public Attributes

Protected Member Functions

Protected Attributes

Friends

Detailed Description

Member Function Documentation

◆ arc() [1/2]

◆ arc() [2/2]

◆ begin_complex_polygon()

◆ begin_line()

◆ begin_loop()

◆ begin_points()

◆ begin_polygon()

◆ circle()

◆ class_name()

◆ clip_box()

◆ color() [1/2]

◆ color() [2/2]

◆ copy_offscreen()

◆ curve()

◆ descent()

◆ draw() [1/5]

◆ draw() [2/5]

◆ draw() [3/5]

◆ draw() [4/5]

◆ draw() [5/5]

◆ draw_image() [1/2]

◆ draw_image() [2/2]

◆ draw_image_mono() [1/2]

◆ draw_image_mono() [2/2]

◆ draw_scaled()

◆ end_complex_polygon()

◆ end_line()

◆ end_loop()

◆ end_points()

◆ end_polygon()

◆ font()

◆ gap()

◆ height()

◆ line() [1/2]

◆ line() [2/2]

◆ line_style()

◆ loop() [1/2]

◆ loop() [2/2]

◆ not_clipped()

◆ pie()

◆ point()

◆ polygon() [1/2]

◆ polygon() [2/2]

◆ pop_clip()

◆ push_clip()

◆ push_no_clip()

◆ rect()

◆ rectf()

◆ rtl_draw()

◆ text_extents()

◆ transformed_vertex()

◆ vertex()

◆ width() [1/2]

◆ width() [2/2]

◆ xyline() [1/3]

◆ xyline() [2/3]

◆ xyline() [3/3]

◆ yxline() [1/3]

◆ yxline() [2/3]

◆ yxline() [3/3]

Friends And Related Function Documentation

◆ fl_arc [1/2]

◆ fl_arc [2/2]

◆ fl_begin_complex_polygon

◆ fl_begin_points

◆ fl_circle

◆ fl_clip_box

◆ fl_clip_region

◆ fl_color [1/2]

◆ fl_color [2/2]

◆ fl_copy_offscreen

◆ fl_curve