ios 用程序绘制饼图的demo(3)

来源：未知责任编辑：责任编辑发表时间:2015-03-01 01:33　点击:次

        CGPathMoveToPoint(path, nil, starx, stary);
        CGPathAddArc(path, nil, 160, 230, 150, startAngle, endAngle, 0);
        CGPathAddLineToPoint(path, nil, endx, endy1);

        CGPathAddArc(path, nil, 160, 230 + spaceHeight, 150, endAngle, startAngle, 1);
        CGContextAddPath(context, path);

        [[colorArr objectAtIndex:i % [valueArr count]] setFill];
        [[UIColor colorWithWhite:0.9 alpha:1.0] setStroke];

        CGContextDrawPath(context, kCGPathFill);

        [[UIColor colorWithWhite:0.1 alpha:0.4] setFill];
        CGContextAddPath(context, path);
        CGContextDrawPath(context, kCGPathFill);


    }


    //整体渐变
    CGFloat componets [] = {0.0, 0.0, 0.0, 0.5,0.0,0.0,0.0,0.1};

    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();

    CGGradientRef gradient = CGGradientCreateWithColorComponents(colorspace, componets, nil, 2);

    CGContextDrawRadialGradient(context, gradient, CGPointMake(160,230), 0, CGPointMake(160,230), 150, 0 );

    CFRelease(colorspace);
    CGGradientRelease(gradient);


    CGContextRestoreGState(context);

    //绘制文字

    for(int i = 0; i< [valueArr count]; i++)
    {
        float origionx = 50 ;
        float origiony = i * 30 + 200;

        [[colorArr objectAtIndex:i % [valueArr count]] setFill];