2014/10/15 下午 10:10:10

iphone Programming Glossary: imagecontext

How to display an image on a MKOverlayView?

http://stackoverflow.com/questions/3891850/how-to-display-an-image-on-a-mkoverlayview

Create the imagecontext by defining the colorspace and the address of the location to store the data CGContextRef imageContext CGBitmapContextCreate imageData width height 8 width 4 imageColorSpace kCGImageAlphaPremultipliedLast CGContextSaveGState.. imageData width height 8 width 4 imageColorSpace kCGImageAlphaPremultipliedLast CGContextSaveGState imageContext Scale the image to the opposite orientation so it can be easylier drawn with CGContectDrawImage CGContextTranslateCTM imageContext.. Scale the image to the opposite orientation so it can be easylier drawn with CGContectDrawImage CGContextTranslateCTM imageContext 0 height CGContextScaleCTM imageContext 1.0 1.0 if image.imageOrientation UIImageOrientationLeft CGContextRotateCTM imageContext..

UIImage Shadow Trouble

http://stackoverflow.com/questions/962827/uiimage-shadow-trouble

height width int width int w width int h height CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB CGContextRef imageContext CGBitmapContextCreate NULL w h 8 4 w colorSpace kCGImageAlphaPremultipliedFirst CGContextBeginPath imageContext CGRect rect.. imageContext CGBitmapContextCreate NULL w h 8 4 w colorSpace kCGImageAlphaPremultipliedFirst CGContextBeginPath imageContext CGRect rect CGRectMake 0 0 w h addRoundedRectToPath imageContext rect 10 10 CGContextClosePath imageContext CGContextClip.. kCGImageAlphaPremultipliedFirst CGContextBeginPath imageContext CGRect rect CGRectMake 0 0 w h addRoundedRectToPath imageContext rect 10 10 CGContextClosePath imageContext CGContextClip imageContext CGContextDrawImage imageContext CGRectMake 0 0 w h..