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POdraw line on MKMapView with pattern image
 

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    <p>I try to draw a line on a <code>MKMapView</code> with a pattern image. The drawing is done by adding a custom <code>MKMapOverlay</code> view. </p> <p>I'm able to get the line drawn, but it seems that the drawing is done using only the left, topmost pixel of the pattern image, instead of the whole image. </p> <p>Here is my drawing routine:</p> <pre><code>void drawPatternCellCallback(void *info, CGContextRef cgContext) { UIImage *patternImage = [UIImage imageNamed:@"tmpLine"]; CGContextDrawImage(cgContext, CGRectMake(0, 0, patternImage.size.width, patternImage.size.height), patternImage.CGImage); } - (void)drawMapRect:(MKMapRect)mapRect zoomScale:(MKZoomScale)zoomScale inContext:(CGContextRef)context { float alpha = 1; float tileW = 6.0f; float tileH = 4.0f; CGFloat lineWidth = MKRoadWidthAtZoomScale(zoomScale)*2; CGMutablePathRef path = CGPathCreateMutable(); if (path != nil) { //setup styles CGContextSetRGBStrokeColor(context, 0.0f, 0.0f, 1.0f, 0.5f); const CGPatternCallbacks kPatternCallbacks = {0, drawPatternCellCallback, NULL}; CGPatternRef strokePattern = CGPatternCreate( NULL, CGRectMake(0, 0, tileW, tileH), CGAffineTransformIdentity, tileW, // horizontal spacing tileH,// vertical spacing kCGPatternTilingConstantSpacing, true, &amp;kPatternCallbacks); //color sapce CGColorSpaceRef patternSpace = CGColorSpaceCreatePattern(NULL); CGContextSetStrokeColorSpace(context, patternSpace); //pattern CGContextSetStrokePattern(context, strokePattern, &amp;alpha); //joins/ends CGContextSetLineJoin(context, kCGLineJoinMiter); CGContextSetLineCap(context, kCGLineCapButt); CGContextSetLineWidth(context, lineWidth); //OK, let's draw it CGPoint firstCGPoint = [self pointForMapPoint:self.point1]; CGPoint lastCGPoint = [self pointForMapPoint:self.point2]; CGPathMoveToPoint(path, NULL, lastCGPoint.x, lastCGPoint.y); CGPathAddLineToPoint(path, NULL, firstCGPoint.x, firstCGPoint.y); CGContextAddPath(context, path); CGContextStrokePath(context); //house hold CGPathRelease(path); CGPatternRelease(strokePattern); CGColorSpaceRelease(patternSpace); } } </code></pre> <p>Any idea what's wrong?</p> <p>Thanx!</p>
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