初始化

cocos2d-x/cocos/platform/CCCanvasRenderingContext2D.h

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+/****************************************************************************
+ Copyright (c) 2018 Xiamen Yaji Software Co., Ltd.
+
+ http://www.cocos2d-x.org
+
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
+ ****************************************************************************/
+
+#pragma once
+
+#include "base/ccMacros.h"
+#include "base/CCData.h"
+#include "math/CCGeometry.h"
+
+#include <string>
+
+#ifndef OBJC_CLASS
+#ifdef __OBJC__
+#define OBJC_CLASS(name) @class name
+#else
+#define OBJC_CLASS(name) class name
+#endif
+#endif // OBJC_CLASS
+
+OBJC_CLASS(CanvasRenderingContext2DImpl);
+
+NS_CC_BEGIN
+
+class CC_DLL CanvasGradient
+{
+public:
+    CanvasGradient();
+    ~CanvasGradient();
+    void addColorStop(float offset, const std::string& color);
+};
+
+class CC_DLL CanvasRenderingContext2D
+{
+public:
+    CanvasRenderingContext2D(float width, float height);
+    ~CanvasRenderingContext2D();
+
+    // Rect
+    void rect(float x, float y, float width, float height);
+    void clearRect(float x, float y, float width, float height);
+    void fillRect(float x, float y, float width, float height);
+
+    void fillText(const std::string& text, float x, float y, float maxWidth = -1.0f);
+    void strokeText(const std::string& text, float x, float y, float maxWidth = -1.0f);
+    Size measureText(const std::string& text);
+    CanvasGradient* createLinearGradient(float x0, float y0, float x1, float y1);
+    void save();
+    // Paths
+    void beginPath();
+    void closePath();
+    void moveTo(float x, float y);
+    void lineTo(float x, float y);
+    void fill();
+    void stroke();
+    void restore();
+
+    // callback
+    using CanvasBufferUpdatedCallback = std::function<void(const Data&)>;
+    void setCanvasBufferUpdatedCallback(const CanvasBufferUpdatedCallback& cb);
+    void setPremultiply(bool multiply);
+    
+    // functions for properties
+    void set__width(float width);
+    void set__height(float height);
+    void set_lineWidth(float lineWidth);
+    void set_lineJoin(const std::string& lineJoin);
+    void set_lineCap(const std::string& lineCap);
+    void set_font(const std::string& font);
+    void set_textAlign(const std::string& textAlign);
+    void set_textBaseline(const std::string& textBaseline);
+    void set_fillStyle(const std::string& fillStyle);
+    void set_strokeStyle(const std::string& strokeStyle);
+    void set_globalCompositeOperation(const std::string& globalCompositeOperation);
+
+    // fill image data into Context2D
+    void _fillImageData(const Data& imageData, float imageWidth, float imageHeight, float offsetX, float offsetY);
+
+    // transform
+    void translate(float x, float y);
+    void scale(float x, float y);
+    void rotate(float angle);
+
+    void transform(float a, float b, float c, float d, float e, float f);
+    void setTransform(float a, float b, float c, float d, float e, float f);
+
+private:
+    void recreateBufferIfNeeded();
+
+public:
+
+    float __width = 0.0f;
+    float __height = 0.0f;
+
+    // Line styles
+    float _lineWidth = 1.0f;
+    std::string _lineJoin = "miter";
+    std::string _lineCap = "butt";
+
+    // Text styles
+    std::string _font = "10px sans-serif";
+    std::string _textAlign = "start";
+    std::string _textBaseline = "alphabetic";
+
+    // Fill and stroke styles
+    std::string _fillStyle = "#000";
+    std::string _strokeStyle = "#000";
+
+    // Compositing
+    std::string _globalCompositeOperation = "source-over";
+
+private:
+
+    CanvasBufferUpdatedCallback _canvasBufferUpdatedCB = nullptr;
+    CanvasRenderingContext2DImpl* _impl = nullptr;
+
+    bool _isBufferSizeDirty = true;
+    bool _premultiply = false;
+};
+
+NS_CC_END