2014/10/15 下午 10:05:00

iphone Programming Glossary: cgcontextconcatctm

Drawing rotated text with NSString drawInRect

http://stackoverflow.com/questions/10289898/drawing-rotated-text-with-nsstring-drawinrect

whiteColor .CGColor NSString str @ some test string CGAffineTransform transform1 CGAffineTransformMakeRotation M_PI 4 CGContextConcatCTM context transform1 CGContextTranslateCTM context 0 0 UIFont font UIFont systemFontOfSize 16.0 str drawInRect CGRectMake.. the context 90 degrees convert to radians CGAffineTransform transform1 CGAffineTransformMakeRotation 90.0 M_PI 180.0 CGContextConcatCTM context transform1 Move the context back into the view CGContextTranslateCTM context rect.size.height 0 Draw the string..

CGImage/UIImage lazily loading on UI thread causes stutter

http://stackoverflow.com/questions/1815476/cgimage-uiimage-lazily-loading-on-ui-thread-causes-stutter

CGContextScaleCTM context scaleRatioX scaleRatioY CGContextTranslateCTM context 0 currentHeight CGContextConcatCTM context transform CGContextDrawImage context CGRectMake 0 0 currentWidth currentHeight imgRef UIGraphicsEndImageContext..

MFMailComposeViewController image orientation

http://stackoverflow.com/questions/20204495/mfmailcomposeviewcontroller-image-orientation

context height 0 else CGContextScaleCTM context scaleRatio scaleRatio CGContextTranslateCTM context 0 height CGContextConcatCTM context transform CGContextDrawImage UIGraphicsGetCurrentContext CGRectMake 0 0 width height imgRef UIImage imageCopy UIGraphicsGetImageFromCurrentImageContext..

CGContextDrawPDFPage taking up large amounts of memory

http://stackoverflow.com/questions/2975240/cgcontextdrawpdfpage-taking-up-large-amounts-of-memory

Second move origin CGContextTranslateCTM g 0 rect.size.height Now apply the transform to draw the page within the rect CGContextConcatCTM g t Finally draw the page The important bit. Commenting out the following line fixes the crashing issue. CGContextDrawPDFPage..

How do I export UIImage array as a movie?

http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie

frameSize.height 8 4 frameSize.width rgbColorSpace kCGImageAlphaNoneSkipFirst NSParameterAssert context CGContextConcatCTM context frameTransform CGContextDrawImage context CGRectMake 0 0 CGImageGetWidth image CGImageGetHeight image image CGColorSpaceRelease..

Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints?

http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints

issue.pdfDoc pageIndex 1 pdfToPageTransform CGPDFPageGetDrawingTransform pdfPage kCGPDFMediaBox layer.bounds 0 true CGContextConcatCTM context pdfToPageTransform CGContextDrawPDFPage context pdfPage issue is the object containg the CGPDFDocumentRef . I synchronize..

how to fit pdf page in entire view

http://stackoverflow.com/questions/4321681/how-to-fit-pdf-page-in-entire-view

NSLog @ the scaleToApply is f scaleToApply NSLog @ the view bounds are @ self.view description if scaleToApply yScale CGContextConcatCTM ctx CGAffineTransformMakeTranslation 100 150 else CGContextConcatCTM ctx CGAffineTransformMakeTranslation 180 260 evans.. @ self.view description if scaleToApply yScale CGContextConcatCTM ctx CGAffineTransformMakeTranslation 100 150 else CGContextConcatCTM ctx CGAffineTransformMakeTranslation 180 260 evans CGContextConcatCTM ctx CGAffineTransformMakeScale scaleToApply scaleToApply.. CGAffineTransformMakeTranslation 100 150 else CGContextConcatCTM ctx CGAffineTransformMakeTranslation 180 260 evans CGContextConcatCTM ctx CGAffineTransformMakeScale scaleToApply scaleToApply CGContextConcatCTM ctx CGPDFPageGetDrawingTransform myPageRef kCGPDFCropBox..

problem with rendering pdf on the entire screen of pdf

http://stackoverflow.com/questions/4634331/problem-with-rendering-pdf-on-the-entire-screen-of-pdf

NSLog @ the scaleToApply is f scaleToApply NSLog @ the view bounds are @ self.view description if scaleToApply yScale CGContextConcatCTM ctx CGAffineTransformMakeTranslation 100 150 else CGContextConcatCTM ctx CGAffineTransformMakeTranslation 180 260 CGContextConcatCTM.. @ self.view description if scaleToApply yScale CGContextConcatCTM ctx CGAffineTransformMakeTranslation 100 150 else CGContextConcatCTM ctx CGAffineTransformMakeTranslation 180 260 CGContextConcatCTM ctx CGAffineTransformMakeScale scaleToApply scaleToApply.. ctx CGAffineTransformMakeTranslation 100 150 else CGContextConcatCTM ctx CGAffineTransformMakeTranslation 180 260 CGContextConcatCTM ctx CGAffineTransformMakeScale scaleToApply scaleToApply CGContextConcatCTM ctx CGPDFPageGetDrawingTransform myPageRef kCGPDFCropBox..

layer.renderInContext doesn't take layer.mask into account?

http://stackoverflow.com/questions/4896296/layer-renderincontext-doesnt-take-layer-mask-into-account

Reverse the coordinate switch CGAffineTransform ctm CGContextGetCTM context ctm CGAffineTransformInvert ctm CGContextConcatCTM context ctm CGContextDrawImage context CGRectMake 0 0 cWidth cHeight mosaicLayer.image.CGImage CGImageRef mergeResult CGBitmapContextCreateImage..

UIImagePickerController camera preview is portrait in landscape app

http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app

iOS UIImagePickerController result image orientation after upload

http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload

CGImageGetBitsPerComponent self.CGImage 0 CGImageGetColorSpace self.CGImage CGImageGetBitmapInfo self.CGImage CGContextConcatCTM ctx transform switch self.imageOrientation case UIImageOrientationLeft case UIImageOrientationLeftMirrored case UIImageOrientationRight..

AVFoundation + AssetWriter: Generate Movie With Images and Audio

http://stackoverflow.com/questions/5640657/avfoundation-assetwriter-generate-movie-with-images-and-audio

pxdata size.width size.height 8 4 size.width rgbColorSpace kCGImageAlphaNoneSkipFirst NSParameterAssert context CGContextConcatCTM context CGAffineTransformMakeRotation 0 CGContextDrawImage context CGRectMake 0 0 CGImageGetWidth image CGImageGetHeight..