cocos2d-x3.2DrawNode绘图API

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class CC_DLL DrawNode : public Node

{

public:

//初始化一个DrawNode对象，然后被addChild添加进去就ok了

static DrawNode* create();

//画实心圆，参数分别是圆心位置、圆半径、圆填充颜色，如果要画空心圆，就把圆当多边形画(这个多边形点数很多而已)

void drawDot(const Vec2 &pos, float radius, const Color4F &color);

//画线段，从from到to，2*radius是线段的宽度和radius是线段两头半圆形的半径

void drawSegment(const Vec2 &from, const Vec2 &to, float radius, const Color4F &color);

//画多边形，verts为点集，count为点数，fillColor为填充颜色，borderWidth为边缘线宽，borderColor为边缘线颜色

void drawPolygon(Vec2 *verts, int count, const Color4F &fillColor, float borderWidth, const Color4F &borderColor);

//画三角形，三人顶点及其填充色

void drawTriangle(const Vec2 &p1, const Vec2 &p2, const Vec2 &p3, const Color4F &color);

//画三次贝塞尔曲线

void drawCubicBezier(const Vec2& from, const Vec2& control1, const Vec2& control2, const Vec2& to, unsigned int segments, const Color4F &color);

//画二次贝塞尔曲线

void drawQuadraticBezier(const Vec2& from, const Vec2& control, const Vec2& to, unsigned int segments, const Color4F &color);

/** Clear the geometry in the node's buffer. */

void clear();

/**

* @js NA

* @lua NA

*/

const BlendFunc& getBlendFunc() const;

/**

* @code

* When this function bound into js or lua,the parameter will be changed

* In js: var setBlendFunc(var src, var dst)

* @endcode

* @lua NA

*/

void setBlendFunc(const BlendFunc &blendFunc);

void onDraw(const Mat4 &transform, uint32_t flags);

// 新的绘图渲染函数

virtual void draw(Renderer *renderer, const Mat4 &transform, uint32_t flags) override;

CC_CONSTRUCTOR_ACCESS:

DrawNode();

virtual ~DrawNode();

virtual bool init();

protected:

void ensureCapacity(int count);

GLuint _vao;

GLuint _vbo;

int _bufferCapacity;

GLsizei _bufferCount;

V2F_C4B_T2F *_buffer;

BlendFunc _blendFunc;

CustomCommand _customCommand;

bool _dirty;

private:

CC_DISALLOW_COPY_AND_ASSIGN(DrawNode);

};

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//创建DrawNode对象

DrawNode *drawNode = DrawNode::create();

//加入场景就OK

this->addChild(drawNode, 20);

//画实心圆

drawNode->drawDot(Vec2(100, 100), 50, Color4F(0.5,0.6,0,1));

//画线段

drawNode->drawSegment(Vec2(100,100), Vec2(100,220), 0.5, Color4F(0,1,0,1));

// 画多边形

Vec2 points[] = { Vec2(s.height/4, 10), Vec2(s.width - 10, s.height/5), Vec2(s.width/3*2,s.height) };

drawNode->drawPolygon(points, sizeof(points)/sizeof(points[0]), Color4F(1,0,0,0.5), 2, Color4F(0,0,1,1));

// 画三角形

drawNode->drawTriangle(Vec2(10, 10), Vec2(70, 30), Vec2(100, 140), Color4F(CCRANDOM_0_1(), CCRANDOM_0_1(), CCRANDOM_0_1(), 0.5));

// 画二次贝塞尔曲线

drawNode->drawQuadraticBezier(Vec2(s.width - 150, s.height - 150), Vec2(s.width - 70, s.height - 10), Vec2(s.width - 10, s.height - 10),

10, Color4F(CCRANDOM_0_1(), CCRANDOM_0_1(), CCRANDOM_0_1(), 0.5));

// 画三次贝塞尔曲线

draw->drawCubicBezier(Vec2(s.width - 250, 40), Vec2(s.width - 70, 100), Vec2(s.width - 30, 250), Vec2(s.width - 10, s.height - 50),

10, Color4F(CCRANDOM_0_1(), CCRANDOM_0_1(), CCRANDOM_0_1(), 0.5));