Merge pull request #3056 from DarraghCoy/cc_draw_solid_circle

Add ccDrawSolidCircle

cocos2dx/draw_nodes/CCDrawingPrimitives.cpp

@@ -383,6 +383,52 @@ void CC_DLL ccDrawCircle( const Point& center, float radius, float angle, unsign
     ccDrawCircle(center, radius, angle, segments, drawLineToCenter, 1.0f, 1.0f);
 }
 
+void ccDrawSolidCircle( const Point& center, float radius, float angle, unsigned int segments, float scaleX, float scaleY)
+{
+    lazy_init();
+    
+    const float coef = 2.0f * (float)M_PI/segments;
+    
+    GLfloat *vertices = (GLfloat*)calloc( sizeof(GLfloat)*2*(segments+2), 1);
+    if( ! vertices )
+        return;
+    
+    for(unsigned int i = 0;i <= segments; i++) {
+        float rads = i*coef;
+        GLfloat j = radius * cosf(rads + angle) * scaleX + center.x;
+        GLfloat k = radius * sinf(rads + angle) * scaleY + center.y;
+        
+        vertices[i*2] = j;
+        vertices[i*2+1] = k;
+    }
+    vertices[(segments+1)*2] = center.x;
+    vertices[(segments+1)*2+1] = center.y;
+    
+    s_pShader->use();
+    s_pShader->setUniformsForBuiltins();
+    s_pShader->setUniformLocationWith4fv(s_nColorLocation, (GLfloat*) &s_tColor.r, 1);
+    
+    ccGLEnableVertexAttribs( kVertexAttribFlag_Position );
+    
+#ifdef EMSCRIPTEN
+    setGLBufferData(vertices, sizeof(GLfloat)*2*(segments+2));
+    glVertexAttribPointer(kVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, 0);
+#else
+    glVertexAttribPointer(kVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
+#endif // EMSCRIPTEN
+    
+    glDrawArrays(GL_TRIANGLE_FAN, 0, (GLsizei) segments+1);
+    
+    free( vertices );
+    
+    CC_INCREMENT_GL_DRAWS(1);
+}
+
+void CC_DLL ccDrawSolidCircle( const Point& center, float radius, float angle, unsigned int segments)
+{
+    ccDrawSolidCircle(center, radius, angle, segments, 1.0f, 1.0f);
+}
+
 void ccDrawQuadBezier(const Point& origin, const Point& control, const Point& destination, unsigned int segments)
 {
     lazy_init();

cocos2dx/draw_nodes/CCDrawingPrimitives.h

@@ -113,6 +113,10 @@ void CC_DLL ccDrawSolidPoly( const Point *poli, unsigned int numberOfPoints, ccC
 void CC_DLL ccDrawCircle( const Point& center, float radius, float angle, unsigned int segments, bool drawLineToCenter, float scaleX, float scaleY);
 void CC_DLL ccDrawCircle( const Point& center, float radius, float angle, unsigned int segments, bool drawLineToCenter);
 
+/** draws a solid circle given the center, radius and number of segments. */
+void CC_DLL ccDrawSolidCircle( const Point& center, float radius, float angle, unsigned int segments, float scaleX, float scaleY);
+void CC_DLL ccDrawSolidCircle( const Point& center, float radius, float angle, unsigned int segments);
+
 /** draws a quad bezier path
  @warning This function could be pretty slow. Use it only for debugging purposes.
  @since v0.8

samples/Cpp/TestCpp/Classes/DrawPrimitivesTest/DrawPrimitivesTest.cpp

@@ -172,6 +172,13 @@ void DrawPrimitivesTest::draw()
     
 	CHECK_GL_ERROR_DEBUG();
     
+	// draw a pink solid circle with 50 segments
+	glLineWidth(2);
+	ccDrawColor4B(255, 0, 255, 255);
+    ccDrawSolidCircle( VisibleRect::center() + ccp(140,0), 40, CC_DEGREES_TO_RADIANS(90), 50, 1.0f, 1.0f);
+    
+	CHECK_GL_ERROR_DEBUG();
+    
 	// open yellow poly
 	ccDrawColor4B(255, 255, 0, 255);
 	glLineWidth(10);