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1: /* ImageGraphicAttribute.java 2: Copyright (C) 2003 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package java.awt.font; 40: 41: import java.awt.Graphics2D; 42: import java.awt.Image; 43: import java.awt.geom.Rectangle2D; 44: 45: /** 46: * This is an implementation of GraphicAttribute which draws images in a 47: * TextLayout. 48: * 49: * @author Lillian Angel 50: * @author Michael Koch 51: */ 52: public final class ImageGraphicAttribute 53: extends GraphicAttribute 54: { 55: private Image image; 56: private float originX; 57: private float originY; 58: 59: /** 60: * Constucts an instance from the specified Image. The origin is at (0, 0). 61: * 62: * @param image - image to construct from. 63: * @param alignment - the alignment 64: */ 65: public ImageGraphicAttribute(Image image, int alignment) 66: { 67: this(image, alignment, 0, 0); 68: } 69: 70: /** 71: * Constucts an instance from the specified Image. The origin is at (originX, 72: * originY). 73: * 74: * @param image - image to construct from 75: * @param alignment - the alignment 76: * @param originX - x point of origin 77: * @param originY - y point of origin 78: */ 79: public ImageGraphicAttribute(Image image, int alignment, float originX, 80: float originY) 81: { 82: super(alignment); 83: this.image = image; 84: this.originX = originX; 85: this.originY = originY; 86: } 87: 88: /** 89: * Draws the image at the specified location, relative to the 90: * origin. 91: * 92: * @param g - the graphics to use to render the image 93: * @param x - the x location 94: * @param y - the y location 95: */ 96: public void draw(Graphics2D g, float x, float y) 97: { 98: g.drawImage(image, (int) (x - originX), (int) (y - originY), null); 99: } 100: 101: /** 102: * Compares this to the specified Object 103: * 104: * @param obj - the object to compare 105: * @return true if the obj and this are equivalent 106: */ 107: public boolean equals(Object obj) 108: { 109: if (! (obj instanceof ImageGraphicAttribute)) 110: return false; 111: 112: return equals((ImageGraphicAttribute) obj); 113: } 114: 115: /** 116: * Compares this to the ImageGraphicAttribute given, by 117: * comparing all fields and values. 118: * 119: * @param rhs - the ImageGraphicAttribute to compare 120: * @return true if the object given is equivalent to this 121: */ 122: public boolean equals(ImageGraphicAttribute rhs) 123: { 124: return ((this == rhs) || ((this.getAscent() == rhs.getAscent()) 125: && (this.getAdvance() == rhs.getAdvance()) 126: && (this.getAlignment() == rhs.getAlignment()) 127: && (this.getBounds().equals(rhs.getBounds())) 128: && (this.getDescent() == rhs.getDescent()) 129: && (this.hashCode() == rhs.hashCode()) 130: && (this.image.equals(rhs.image)) 131: && (this.originX == rhs.originX) 132: && (this.originY == rhs.originY))); 133: } 134: 135: /** 136: * Returns distance from the origin to the right edge of the image of this. 137: * 138: * @return the advance 139: */ 140: public float getAdvance() 141: { 142: return Math.max(0, image.getWidth(null) - originX); 143: } 144: 145: /** 146: * Returns the the distance from the top of the image to the origin of this. 147: * 148: * @return the ascent. 149: */ 150: public float getAscent() 151: { 152: return Math.max(0, originY); 153: } 154: 155: /** 156: * Gets the bounds of the object rendered, relative to the position. 157: * 158: * @return the bounds of the object rendered, relative to the position. 159: */ 160: public Rectangle2D getBounds() 161: { 162: // This is equivalent to what Sun's JDK returns. 163: // I am not entirely sure why the origin is negative. 164: return new Rectangle2D.Float(- originX, - originY, image.getWidth(null), 165: image.getHeight(null)); 166: } 167: 168: /** 169: * Returns the distance from the origin to the bottom of the image. 170: * 171: * @return the descent 172: */ 173: public float getDescent() 174: { 175: return Math.max(0, image.getHeight(null) - originY); 176: } 177: 178: /** 179: * Gets the hash code for this image. 180: * 181: * @return the hash code 182: */ 183: public int hashCode() 184: { 185: return image.hashCode(); 186: } 187: }