I am using UIView subclass to draw an alphabet using QuartzCore Framework.Using this code only hollow characters are drawn(By Making the stroke color- blue color).Here I need each pixel position (coordinates) of the character that is added on current view.Please give me an idea how I will get each pixel point coordinates(Only the blue points in the code below) of the hollow character drawn.
The code is below:
/*UIView Subclass Method*/
- (void)drawRect:(CGRect)rect
{
//Method to draw the alphabet
[self drawChar:@"A" xcoord:5 ycoords:35];
}
-(void)drawChar:(NSString *)str xcoord: (CGFloat)x ycoord: (CGFloat)y
{
const char *text = [str UTF8String];//Getting the alphabet
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSelectFont(ctx, "Helvetica", 40.0, kCGEncodingMacRoman);
CGContextSetTextDrawingMode(ctx, kCGTextFillStroke);
CGContextSetStrokeColorWithColor(ctx, [UIColor blueColor].CGColor);//to make the character hollow-Need only these points
CGContextSetFillColorWithColor(ctx, [UIColor clearColor].CGColor);//Fill color of character is clear color
CGAffineTransform xform = CGAffineTransformMake(
1.0, 0.0,
0.0, -1.0,
0.0, 0.0);//Giving a transformation to the alphabet
CGContextSetTextMatrix(ctx, xform);
CGContextShowTextAtPoint(ctx, x, y, text, strlen(text));//Generating the character
}