I am displaying text using Quartz. Here is my code:
CGContextRef myContext = UIGraphicsGetCurrentContext();
CGContextSelectFont(myContext, "Helvetica", 12, kCGEncodingMacRoman);
CGContextSetCharacterSpacing(myContext, 8);
CGContextSetTextDrawingMode(myContext, kCGTextFillStroke);
CGContextSetRGBFillColor(myContext, 0, 0, 0, 1);
CGContextSetRGBStrokeColor(myContext, 0, 0, 0, 1);
CGContextSetTextMatrix(myContext,CGAffineTransformMake(1, 0, 0, -1, 0, 0));
CGContextShowTextAtPoint(myContext, textOrigin.x, textOrigin.y,[way.name UTF8String],[way.name length]);
This displays my text the right way up and in the right direction, however I also need to add a rotation to the text using CGAffineTransformMakeRotation(angle);
. I can't seem to work out how to aply two affine transforms to the text matrix, though, without one overwriting the other. Any help would be great.
You can combine matrices with CGAffineTransformConcat, e.g.
CGAffineTransform finalTransf = CGAffineTransformConcat(t1, t2);
If you just need to apply rotation to an existing matrix, use CGAffineTransformRotate, e.g.
CGAffineTransform t = CGAffineTransformMake(1, 0, 0, -1, 0, 0);
CGAffineTransform t = CGAffineTransformRotate(t, M_PI/2);
CGContextSetTextMatrix(myContext, t);