ios 用程序绘制饼图的demo(2)

         
        CGContextAddArc(context, 160, 230, 150, startAngle, endAngle, 0); 
         
        CGContextClosePath(context); 
        CGContextDrawPath(context, kCGPathFill); 
         
         
         
        //绘制侧面  
        float starx = cos(startAngle) * 150  +160; 
        float stary = sin(startAngle) * 150 + 230; 
         
        float endx = cos(endAngle) * 150 + 160; 
        float endy = sin(endAngle) * 150 + 230; 
         
        //float starty1 = stary + spaceHeight;  
        float endy1 = endy + spaceHeight; 
         
         
        if(endAngle < K_PI) 
        { 
        } 
         
        //只有弧度《 3.14 的才会画前面的厚度  
        else if(startAngle < K_PI) 
        { 
            endAngle = K_PI; 
            endx = 10; 
            endy1 = 230+spaceHeight; 
        } 
         
        else 
            break; 
          
         
        //CGContextSetBlendMode(context, kCGBlendModeMultiply);  
         
         
        //绘制厚度  
        CGMutablePathRef path = CGPathCreateMutable();