MyGUI_RotatingSkin.cpp

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/*
 * This source file is part of MyGUI. For the latest info, see http://mygui.info/
 * Distributed under the MIT License
 * (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
 */
 
#include "MyGUI_Precompiled.h"
#include "MyGUI_RotatingSkin.h"
#include "MyGUI_RenderItem.h"
#include "MyGUI_CommonStateInfo.h"
#include "MyGUI_RenderManager.h"
#include "MyGUI_GeometryUtility.h"
 
namespace MyGUI
{
 
    RotatingSkin::RotatingSkin() :
        mGeometryOutdated(false),
        mAngle(0.0f),
        mEmptyView(false),
        mCurrentColour(0xFFFFFFFF),
        mNode(nullptr),
        mRenderItem(nullptr)
    {
        mVertexFormat = RenderManager::getInstance().getVertexFormat();
    }
 
    void RotatingSkin::setAngle(float _angle)
    {
        mAngle = _angle;
        mGeometryOutdated = true;
 
        if (nullptr != mNode)
            mNode->outOfDate(mRenderItem);
    }
 
    void RotatingSkin::setCenter(const IntPoint& _center)
    {
        mCenterPos = _center;
        mGeometryOutdated = true;
 
        if (nullptr != mNode)
            mNode->outOfDate(mRenderItem);
    }
 
    IntPoint RotatingSkin::getCenter(bool _local) const
    {
        return mCenterPos + (_local ? IntPoint() : mCroppedParent->getAbsolutePosition());
    }
 
    void RotatingSkin::setVisible(bool _visible)
    {
        if (mVisible == _visible)
            return;
 
        mVisible = _visible;
        mGeometryOutdated = true;
 
        if (nullptr != mNode)
            mNode->outOfDate(mRenderItem);
    }
 
    void RotatingSkin::setAlpha(float _alpha)
    {
        uint32 alpha = ((uint8)(_alpha * 255) << 24);
        mCurrentColour = (mCurrentColour & 0x00FFFFFF) | (alpha & 0xFF000000);
 
        if (nullptr != mNode)
            mNode->outOfDate(mRenderItem);
    }
 
    void RotatingSkin::_correctView()
    {
        mGeometryOutdated = true;
 
        if (nullptr != mNode)
            mNode->outOfDate(mRenderItem);
    }
 
    void RotatingSkin::_setAlign(const IntSize& _oldsize)
    {
        // первоначальное выравнивание
        if (mAlign.isHStretch())
        {
            // растягиваем
            mCoord.width = mCoord.width + (mCroppedParent->getWidth() - _oldsize.width);
            mIsMargin = true; // при изменении размеров все пересчитывать
        }
        else if (mAlign.isRight())
        {
            // двигаем по правому краю
            mCoord.left = mCoord.left + (mCroppedParent->getWidth() - _oldsize.width);
        }
        else if (mAlign.isHCenter())
        {
            // выравнивание по горизонтали без растяжения
            mCoord.left = (mCroppedParent->getWidth() - mCoord.width) / 2;
        }
 
        if (mAlign.isVStretch())
        {
            // растягиваем
            mCoord.height = mCoord.height + (mCroppedParent->getHeight() - _oldsize.height);
            mIsMargin = true; // при изменении размеров все пересчитывать
        }
        else if (mAlign.isBottom())
        {
            // двигаем по нижнему краю
            mCoord.top = mCoord.top + (mCroppedParent->getHeight() - _oldsize.height);
        }
        else if (mAlign.isVCenter())
        {
            // выравнивание по вертикали без растяжения
            mCoord.top = (mCroppedParent->getHeight() - mCoord.height) / 2;
        }
 
        mCurrentCoord = mCoord;
        _updateView();
    }
 
    void RotatingSkin::_updateView()
    {
        mEmptyView = ((0 >= _getViewWidth()) || (0 >= _getViewHeight()));
 
        mGeometryOutdated = true;
 
        if (nullptr != mNode)
            mNode->outOfDate(mRenderItem);
    }
 
    void RotatingSkin::createDrawItem(ITexture* _texture, ILayerNode* _node)
    {
        MYGUI_ASSERT(!mRenderItem, "mRenderItem must be nullptr");
 
        mNode = _node;
        mRenderItem = mNode->addToRenderItem(_texture, true, false);
        mRenderItem->addDrawItem(this, (GEOMETRY_VERTICIES_TOTAL_COUNT - 2) * 3);
    }
 
    void RotatingSkin::destroyDrawItem()
    {
        MYGUI_ASSERT(mRenderItem, "mRenderItem must be not nullptr");
 
        mNode = nullptr;
        mRenderItem->removeDrawItem(this);
        mRenderItem = nullptr;
    }
 
    void RotatingSkin::doRender()
    {
        if (!mVisible || mEmptyView)
            return;
 
        Vertex* verticies = mRenderItem->getCurrentVertexBuffer();
 
        float vertex_z = mNode->getNodeDepth();
 
        if (mGeometryOutdated)
        {
            _rebuildGeometry();
            mGeometryOutdated = false;
        }
 
        for (int i = 1; i < GEOMETRY_VERTICIES_TOTAL_COUNT - 1; ++i)
        {
            verticies[3 * i - 3].set(mResultVerticiesPos[0].left, mResultVerticiesPos[0].top, vertex_z, mResultVerticiesUV[0].left, mResultVerticiesUV[0].top, mCurrentColour);
            verticies[3 * i - 2].set(mResultVerticiesPos[i].left, mResultVerticiesPos[i].top, vertex_z, mResultVerticiesUV[i].left, mResultVerticiesUV[i].top, mCurrentColour);
            verticies[3 * i - 1].set(mResultVerticiesPos[i + 1].left, mResultVerticiesPos[i + 1].top, vertex_z, mResultVerticiesUV[i + 1].left, mResultVerticiesUV[i + 1].top, mCurrentColour);
        }
 
        mRenderItem->setLastVertexCount((GEOMETRY_VERTICIES_TOTAL_COUNT - 2) * 3);
    }
 
    void RotatingSkin::_setColour(const Colour& _value)
    {
        uint32 colour = texture_utility::toNativeColour(_value, mVertexFormat);
        mCurrentColour = (colour & 0x00FFFFFF) | (mCurrentColour & 0xFF000000);
 
        if (nullptr != mNode)
            mNode->outOfDate(mRenderItem);
    }
 
    void RotatingSkin::setStateData(IStateInfo* _data)
    {
        RotatingSkinStateInfo* data = _data->castType<RotatingSkinStateInfo>();
 
        setAngle(data->getAngle());
        setCenter(data->getCenter());
 
        _setUVSet(data->getRect());
    }
 
    void RotatingSkin::_setUVSet(const FloatRect& _rect)
    {
        mCurrentTexture = _rect;
 
        mGeometryOutdated = true;
 
        if (nullptr != mNode)
            mNode->outOfDate(mRenderItem);
    }
 
    inline float len(float x, float y)
    {
        return std::sqrt(x * x + y * y);
    }
 
    void RotatingSkin::_rebuildGeometry()
    {
        /*
            0 1
            3 2
        */
#ifdef M_PI
#undef M_PI
#endif
        const float M_PI = 3.141593f;
 
        float width_base = (float)mCurrentCoord.width;
        float height_base = (float)mCurrentCoord.height;
 
        // calculate original unrotated angles of uncropped rectangle verticies: between axis and line from center of rotation to vertex)
        float baseAngles[RECT_VERTICIES_COUNT];
        baseAngles[0] = std::atan2((float)mCenterPos.left, (float)mCenterPos.top) + M_PI / 2;
        baseAngles[1] = std::atan2(- width_base + (float)mCenterPos.left, (float)mCenterPos.top) + M_PI / 2;
        baseAngles[2] = std::atan2(- width_base + (float)mCenterPos.left, - height_base + (float)mCenterPos.top) + M_PI / 2;
        baseAngles[3] = std::atan2((float)mCenterPos.left, - height_base + (float)mCenterPos.top) + M_PI / 2;
 
        // calculate original unrotated distances of uncropped rectangle verticies: between center of rotation and vertex)
        float baseDistances[RECT_VERTICIES_COUNT];
        baseDistances[0] = len((float)mCenterPos.left, (float)mCenterPos.top);
        baseDistances[1] = len(- width_base + (float)mCenterPos.left, (float)mCenterPos.top);
        baseDistances[2] = len(- width_base + (float)mCenterPos.left, - height_base + (float)mCenterPos.top);
        baseDistances[3] = len((float)mCenterPos.left, - height_base + (float)mCenterPos.top);
 
 
        // calculate rotated positions of uncropped rectangle verticies (relative to parent)
        FloatPoint baseVerticiesPos[RECT_VERTICIES_COUNT];
 
        int offsetX = /*mCurrentCoord.left +*/ mCenterPos.left;
        int offsetY = /*mCurrentCoord.top +*/ mCenterPos.top;
 
        for (int i = 0; i < RECT_VERTICIES_COUNT; ++i)
        {
            baseVerticiesPos[i].left = offsetX + std::cos(-mAngle + baseAngles[i]) * baseDistances[i];
            baseVerticiesPos[i].top = offsetY - std::sin(-mAngle + baseAngles[i]) * baseDistances[i];
        }
 
        // base texture coordinates
        FloatPoint baseVerticiesUV[RECT_VERTICIES_COUNT] =
        {
            FloatPoint(mCurrentTexture.left, mCurrentTexture.top),
            FloatPoint(mCurrentTexture.right, mCurrentTexture.top),
            FloatPoint(mCurrentTexture.right, mCurrentTexture.bottom),
            FloatPoint(mCurrentTexture.left, mCurrentTexture.bottom)
        };
 
        // now we have rotated uncropped rectangle verticies coordinates
 
        // --------- here the cropping starts ---------
 
        // now we are going to calculate verticies of resulting figure
 
        // no parent - no cropping
        size_t size = RECT_VERTICIES_COUNT;
        if (nullptr == mCroppedParent->getCroppedParent())
        {
            for (int i = 0; i < RECT_VERTICIES_COUNT; ++i)
            {
                mResultVerticiesPos[i] = baseVerticiesPos[i];
                mResultVerticiesUV[i] = baseVerticiesUV[i];
            }
        }
        else
        {
            ICroppedRectangle* parent = mCroppedParent->getCroppedParent();
 
            VectorFloatPoint resultVerticiesPos = geometry_utility::cropPolygon(
                baseVerticiesPos,
                RECT_VERTICIES_COUNT,
                IntCoord(
                    parent->_getMarginLeft() - mCroppedParent->getLeft(),
                    parent->_getMarginTop() - mCroppedParent->getTop(),
                    parent->_getViewWidth(),
                    parent->_getViewHeight()));
 
            for (size_t i = 0; i < resultVerticiesPos.size(); ++i)
            {
                mResultVerticiesPos[i] = resultVerticiesPos[i];
            }
 
            size = resultVerticiesPos.size();
 
            // calculate texture coordinates
            FloatPoint v0 = baseVerticiesUV[3] - baseVerticiesUV[0];
            FloatPoint v1 = baseVerticiesUV[1] - baseVerticiesUV[0];
            for (size_t i = 0; i < GEOMETRY_VERTICIES_TOTAL_COUNT; ++i)
            {
                if (i < size)
                {
                    FloatPoint point = geometry_utility::getPositionInsideRect(mResultVerticiesPos[i], baseVerticiesPos[0], baseVerticiesPos[1], baseVerticiesPos[3]);
                    mResultVerticiesUV[i] = geometry_utility::getUVFromPositionInsideRect(point, v0, v1, baseVerticiesUV[0]);
                }
                else
                {
                    // all unused verticies is equal to last used
                    mResultVerticiesUV[i] = mResultVerticiesUV[size == 0 ? 0 : (size - 1)];
                }
            }
        }
 
 
        // now calculate widget base offset and then resulting position in screen coordinates
        const RenderTargetInfo& info = mRenderItem->getRenderTarget()->getInfo();
        float vertex_left_base = ((info.pixScaleX * (float)(mCroppedParent->getAbsoluteLeft()) + info.hOffset) * 2) - 1;
        float vertex_top_base = -(((info.pixScaleY * (float)(mCroppedParent->getAbsoluteTop()) + info.vOffset) * 2) - 1);
 
        for (size_t i = 0; i < GEOMETRY_VERTICIES_TOTAL_COUNT; ++i)
        {
            if (i < size)
            {
                mResultVerticiesPos[i].left = vertex_left_base + mResultVerticiesPos[i].left * info.pixScaleX * 2;
                mResultVerticiesPos[i].top = vertex_top_base + mResultVerticiesPos[i].top * info.pixScaleY * -2;
            }
            else
            {
                // all unused verticies is equal to last used
                mResultVerticiesPos[i] = mResultVerticiesPos[size == 0 ? 0 : (size - 1)];
            }
        }
    }
 
    float RotatingSkin::getAngle() const
    {
        return mAngle;
    }
 
} // namespace MyGUI