Question

我使用CGContextFillPath绘制Quartz 2D形状，如下所示：

    CGContextRef conPattern = CGBitmapContextCreate(NULL,
                                                    shp.size.width*2,
                                                    shp.size.height*2,
                                                    8,
                                                    0,
                                                    rgbColorSpace,
                                                    (CGBitmapInfo)kCGImageAlphaPremultipliedFirst);

    CGContextSetLineWidth(conPattern, 10);
    CGContextSetStrokeColorWithColor(conPattern, [UIColor blackColor].CGColor);

    Line * start = [verticesPassed objectAtIndex:0];
    StandPoint * startPoint = start.origin;

    CGContextMoveToPoint(conPattern, ([startPoint.x floatValue]-shp.origin.x)*2 , ([startPoint.y floatValue]-shp.origin.y)*2);

    for (Line * vertice in verticesPassed) {
        StandPoint * standPoint = vertice.origin;
        CGContextAddLineToPoint(conPattern, ([standPoint.x floatValue]-shp.origin.x)*2, ([standPoint.y floatValue]-shp.origin.y)*2);
    }

    CGContextSetFillColorWithColor(conPattern, [UIColor yellowColor].CGColor);
    CGContextFillPath(conPattern);

    [self drawText:conPattern startX:0 startY:20 withText:standName];
    [self drawText:conPattern startX:0 startY:50 withText:standNumber];

    //Make the main image and color it with pattern.
    CGImageRef cgImage = CGBitmapContextCreateImage(conPattern);

    UIImage *imgPattern = [[UIImage alloc]initWithCGImage:cgImage];

这很好用，并绘制我填充的形状。我想要做的就是显示已画出的线条。

我尝试在CGContextStrokePath中添加，但没有运气：

Line * start = [verticesPassed objectAtIndex:0];
    StandPoint * startPoint = start.origin;

    CGContextMoveToPoint(conPattern, ([startPoint.x floatValue]-shp.origin.x)*2 , ([startPoint.y floatValue]-shp.origin.y)*2);

    for (Line * vertice in verticesPassed) {
        StandPoint * standPoint = vertice.origin;
        CGContextAddLineToPoint(conPattern, ([standPoint.x floatValue]-shp.origin.x)*2, ([standPoint.y floatValue]-shp.origin.y)*2);
    }

    CGContextSetFillColorWithColor(conPattern, [UIColor yellowColor].CGColor);
    CGContextFillPath(conPattern);

    CGContextStrokePath(conPattern);

有人可以建议我如何实现这个目标吗？

Answer 1

填写时会消耗路径。如果你想要填充和描边，那么你应该使用

CGContextDrawPath(conPattern, kCGPathFillStroke); // both fill and stroke

一起使用CGContextFillPath和CGContextStrokePath？ iOS版

1 个答案: