Added triangle, quad bezier, cubic bezier drawing to DrawNode

cocos/2d/CCDrawNode.cpp

@@ -437,6 +437,86 @@ void DrawNode::drawPolygon(Point *verts, unsigned int count, const Color4F &fill
     free(extrude);
 }
 
+void DrawNode::drawTriangle(const Point &p1, const Point &p2, const Point &p3, const Color4F &color)
+{
+    unsigned int vertex_count = 2*3;
+    ensureCapacity(vertex_count);
+
+    Color4B col = Color4B(color);
+    V2F_C4B_T2F a = {Vertex2F(p1.x, p1.y), col, Tex2F(0.0, 0.0) };
+    V2F_C4B_T2F b = {Vertex2F(p2.x, p2.y), col, Tex2F(0.0,  0.0) };
+    V2F_C4B_T2F c = {Vertex2F(p3.x, p3.y), col, Tex2F(0.0,  0.0) };
+
+    V2F_C4B_T2F_Triangle *triangles = (V2F_C4B_T2F_Triangle *)(_buffer + _bufferCount);
+    V2F_C4B_T2F_Triangle triangle = {a, b, c};
+    triangles[0] = triangle;
+
+    _bufferCount += vertex_count;
+    _dirty = true;
+}
+
+void DrawNode::drawCubicBezier(const Point& from, const Point& control1, const Point& control2, const Point& to, unsigned int segments, const Color4F &color)
+{
+    unsigned int vertex_count = (segments + 1) * 3;
+    ensureCapacity(vertex_count);
+
+    Tex2F texCoord = Tex2F(0.0, 0.0);
+    Color4B col = Color4B(color);
+    Vertex2F vertex;
+    Vertex2F firstVertex = Vertex2F(from.x, from.y);
+    Vertex2F lastVertex = Vertex2F(to.x, to.y);
+
+    float t = 0;
+    for(unsigned int i = segments + 1; i > 0; i--)
+    {
+        float x = powf(1 - t, 3) * from.x + 3.0f * powf(1 - t, 2) * t * control1.x + 3.0f * (1 - t) * t * t * control2.x + t * t * t * to.x;
+        float y = powf(1 - t, 3) * from.y + 3.0f * powf(1 - t, 2) * t * control1.y + 3.0f * (1 - t) * t * t * control2.y + t * t * t * to.y;
+        vertex = Vertex2F(x, y);
+
+        V2F_C4B_T2F a = {firstVertex, col, texCoord };
+        V2F_C4B_T2F b = {lastVertex, col, texCoord };
+        V2F_C4B_T2F c = {vertex, col, texCoord };
+        V2F_C4B_T2F_Triangle triangle = {a, b, c};
+        ((V2F_C4B_T2F_Triangle *)(_buffer + _bufferCount))[0] = triangle;
+
+        lastVertex = vertex;
+        t += 1.0f / segments;
+        _bufferCount += 3;
+    }
+    _dirty = true;
+}
+
+void DrawNode::drawQuadraticBezier(const Point& from, const Point& control, const Point& to, unsigned int segments, const Color4F &color)
+{
+    unsigned int vertex_count = (segments + 1) * 3;
+    ensureCapacity(vertex_count);
+
+    Tex2F texCoord = Tex2F(0.0, 0.0);
+    Color4B col = Color4B(color);
+    Vertex2F vertex;
+    Vertex2F firstVertex = Vertex2F(from.x, from.y);
+    Vertex2F lastVertex = Vertex2F(to.x, to.y);
+
+    float t = 0;
+    for(unsigned int i = segments + 1; i > 0; i--)
+    {
+        float x = powf(1 - t, 2) * from.x + 2.0f * (1 - t) * t * control.x + t * t * to.x;
+        float y = powf(1 - t, 2) * from.y + 2.0f * (1 - t) * t * control.y + t * t * to.y;
+        vertex = Vertex2F(x, y);
+
+        V2F_C4B_T2F a = {firstVertex, col, texCoord };
+        V2F_C4B_T2F b = {lastVertex, col, texCoord };
+        V2F_C4B_T2F c = {vertex, col, texCoord };
+        V2F_C4B_T2F_Triangle triangle = {a, b, c};
+        ((V2F_C4B_T2F_Triangle *)(_buffer + _bufferCount))[0] = triangle;
+
+        lastVertex = vertex;
+        t += 1.0f / segments;
+        _bufferCount += 3;
+    }
+    _dirty = true;
+}
+
 void DrawNode::clear()
 {
     _bufferCount = 0;

cocos/2d/CCDrawNode.h

@@ -73,6 +73,15 @@ public:
     */
     void drawPolygon(Point *verts, unsigned int count, const Color4F &fillColor, float borderWidth, const Color4F &borderColor);
 	
+    /** draw a triangle with color */
+    void drawTriangle(const Point &p1, const Point &p2, const Point &p3, const Color4F &color);
+
+    /** draw a cubic bezier curve with color and number of segments */
+    void drawCubicBezier(const Point& from, const Point& control1, const Point& control2, const Point& to, unsigned int segments, const Color4F &color);
+
+    /** draw a quadratic bezier curve with color and number of segments */
+    void drawQuadraticBezier(const Point& from, const Point& control, const Point& to, unsigned int segments, const Color4F &color)
+    
     /** Clear the geometry in the node's buffer. */
     void clear();
     /**