对NSImage的一个扩展

概述作者：Codelif     学习了Cocoa的图片制作，受益很多。知道了图片是怎么画出来的。上层原理。可以对图片的图层 *** 作，如添加一个图层，删除图层，图片的混合，图片的缩放，矢量图图的制作，把字符串图片化，制作pdf的一些原理等。 // //  NSImage+ZCPanel.h //  Flected // //  Created by zhuzhichao on 08-12-11. //  

作者：Codelif

    学习了Cocoa的图片制作，受益很多。知道了图片是怎么画出来的。上层原理。可以对图片的图层 *** 作，如添加一个图层，删除图层，图片的混合，图片的缩放，矢量图图的制作，把字符串图片化，制作pdf的一些原理等。

// //  NSImage+ZCPanel.h //  Flected // //  Created by zhuzhichao on 08-12-11. //  copyright 2008 __MyCompanyname__. All rights reserved. #import <Cocoa/Cocoa.h> #import "CTGradIEnt.h" #define MAX_PIXEL_SIZE   600*800 #define PIC_WIDTH  800 #define PIC_HEIGHT 600 //Picture fram /*    NSBMPfileType,    NsgiFfileType,    NSJPEGfileType,0); background-color:inherit">   NSPNGfileType,0); background-color:inherit">   NS@R_627_4301@fileType*/ @interface NSImage (ZCPanel) + (NSImage *) prettyGradIEntimage:(NSSize)gradIEntSize;  // Generates a 256 by 256 pixel image with a complicated gradIEnt in it. + (NSImage *) reflectedImage:(NSImage *)sourceImage amountReflected:(float)fraction; + (NSImage *) createScalesImage:(NSImage *)sourceImage flipFlag:(BOol)bFlip amountReflected:( + (NSImage *) rotateImage:(NSImage*)sourceImage bydegrees:(float)deg; + (NSImage *) imageFromCGImageRef:(CGImageRef)image; //FROME CGImageRef to NSImage - (CGImageRef) nsImagetoCGImageRef;//FROME  NSImage to CGImageRef - (BOol) setSmoothingEffect; //Set smoothing effect BOol) saveImage:(NSImage*)image           saveType:(NSBitmAPImagefileType)storageType          propertIEs:(NSDictionary *)propertIEs          ToTarget:(Nsstring *) targePath;           - (CGImageRef)@R_404_4148@Forfile: (Nsstring*)name atPath: (Nsstring*)filePath; @end //  AppController+ZCBundImage.m #import "NSImage+ZCPanel.h" float distance(NSPoint aPoint); enum pixelComponents { red, green, blue, Alpha }; #define PI 3.14159265358979323846264338327950288 @implementation NSImage (ZCPanel) ////倒立，深度 + (NSImage *)reflectedImage:(NSImage *)sourceImage amountReflected:(float)fraction {     NSImage *reflection = [[NSImage alloc] initWithSize:[sourceImage size]];     [reflection setFlipped:YES];     [reflection lockFocus];     CTGradIEnt *fade = [CTGradIEnt gradIEntWithBeginningcolor:[NScolor colorWithCalibrateDWhite:1.0 Alpha:0.5] endingcolor:[NScolor clearcolor]];     [fade fillRect:NSMakeRect(0, 0, [sourceImage size].wIDth, [sourceImage size].height*fraction) angle:90.0];       [sourceImage drawAtPoint:NSMakePoint(0,0) fromrect:NSZeroRect operation:NSCompositeSourceIn fraction:1.0];     [reflection unlockFocus];     return [reflection autorelease]; } //缩放到目的大小，太小了不缩放添加背景 + (NSImage *)createScalesImage:(NSImage *)sourceImage flipFlag:(float)fraction {     //set flipped     [sourceImage setScalesWhenResized:YES];     if(bFlip)     {         [sourceImage setFlipped:YES];     }          //source picture size     NSSize srcSize = [sourceImage size];     unsigned int uiWIDth= srcSize.wIDth;     unsigned int uiHeight= srcSize.height;      //target bg picture size int bgWIDth = PIC_WIDTH; int bgHeight = PIC_HEIGHT;     NSSize tarSize =NSMakeSize(bgWIDth, bgHeight);     if(uiWIDth>=bgWIDth && uiHeight >= bgHeight)     {         [sourceImage setSize:tarSize];         return [[sourceImage copy] autorelease];     if(uiWIDth>bgWIDth && uiHeight < bgHeight)         [sourceImage setSize:tarSize];                  //target bg picture         NSImage *targetimage = [[NSImage alloc] initWithSize:tarSize];         [targetimage lockFocus];         //fill target bg picture,using white color         [[NScolor whitecolor] set];         NSRectFill(NSMakeRect(0, bgWIDth, bgHeight*fraction));          //draw         [sourceImage drawAtPoint:NSMakePoint(0,(bgHeight - uiHeight)*0.5) fromrect:NSZeroRect operation:NSCompositeSourceIn fraction:1.0];         [targetimage unlockFocus];         return [targetimage autorelease];     }     if(uiWIDth<bgWIDth && uiHeight >bgHeight) //target bg picture         NSImage *targetimage = [[NSImage alloc] initWithSize:tarSize];         [targetimage lockFocus];         [[NScolor whitecolor] set];         NSRectFill(NSMakeRect(0, bgWIDth*fraction)); //draw         [sourceImage drawAtPoint:NSMakePoint((bgWIDth- uiWIDth)*0.5, 0) fromrect:NSZeroRect operation:NSCompositeSourceIn fraction:1.0];         [targetimage unlockFocus];         return [targetimage autorelease];     else //(uiWIDth<bgWIDth && uiHeight < bgHeight) //[sourceImage setSize:tarSize];         [sourceImage drawAtPoint:NSMakePoint((bgWIDth - uiWIDth)*0.5, (bgHeight - uiHeight)*0.5) fromrect:NSZeroRect operation:NSCompositeSourceIn fraction:1.0]; //按照图片的中心旋转90.180.270,360度 float)deg     NSSize srcsize= [sourceImage size];     float srcw = srcsize.wIDth;     float srch= srcsize.height; float newdeg = 0; //旋转弧度 //double ratain = ((deg/180) * PI);     NSRect r1;     if(0< deg && deg <=90)         r1 = NSMakeRect(0.5*(srcw -srch), 0.5*(srch-srcw), srch, srcw);         newdeg = 90.0;     if(90< deg && deg <=180)         r1 = NSMakeRect(0, srcw, srch);         newdeg = 180.0;     if(180< deg && deg <=270)         newdeg = 270.0;     if(270< deg && deg <=360)         newdeg = 360; //draw new image     NSImage *rotated = [[NSImage alloc] initWithSize:[sourceImage size]];     [rotated lockFocus];     NSAffinetransform *transform = [NSAffinetransform transform];     [transform translateXBy:(0.5*srcw) yBy: (0.5*srch)];  //按中心图片旋转     [transform rotateBydegrees:newdeg];                   //旋转度数，rotateByradians：使用弧度     [transform translateXBy:(-0.5*srcw) yBy: (-0.5*srch)];     [transform concat];     [[sourceImage bestRepresentationForDevice: nil] drawInRect: r1];//矩形内画图 //[sourceImage drawInRect:r1 fromrect:NSZeroRect operation:NSCompositecopy fraction:1.0]; //[sourceImage drawAtPoint:arge/*NSZeroPoint*/ fromrect:NSMakeRect(arge.x, arge.y,ww ,wh)/*NSZeroRect*/ operation:NSCompositecopy fraction:1.0];     [rotated unlockFocus];     return [rotated autorelease]; }  //save image to file - (BOol)saveImage:(NSImage*)image                      //source image          saveType:(NSBitmAPImagefileType)storageType   //save type "NSJPEGfileType"          propertIEs:(NSDictionary *)propertIEs         //propertIEs "NSImageCompressionFactor = (NSNumber)0.8"          ToTarget:(Nsstring *) targePath               //save path     NSData *tempdata;     NSBitmAPImageRep *srcImageRep; BOol reflag = NO;     [image lockFocus];     srcImageRep = [NSBitmAPImageRep imageRepWithData:[image TIFFRepresentation]];     tempdata = [srcImageRep representationUsingType:storageType propertIEs:propertIEs];     reflag = [tempdata writetofile:targePath atomically:YES];     [image unlockFocus];     return reflag; // --------------------------------------------------------------------------------------------------------------------- - (CGImageRef)@R_404_4148@Forfile: (Nsstring*)name                         atPath: (Nsstring*)filePath // use ImageIO to get a @R_404_4148@ for a file at a given path     CGImageSourceRef    isr = NulL;     Nsstring *          path = [filePath stringByExpandingTildeInPath];     CGImageRef          image = NulL;   //  path = [path stringByAppendingPathComponent: name]; // create the CGImageSourceRef     isr = CGImageSourceCreateWithURL((CFURLRef)[NSURL fileURLWithPath: path], NulL);     if (isr) // create a @R_404_4148@: // - specify max pixel size // - create the @R_404_4148@ with honoring the EXIF orIEntation flag (correct transform) // - always create the @R_404_4148@ from the full image (ignore the @R_404_4148@ that may be embedded in the image - //                                                  reason: our MAX_ICON_SIZE is larger than existing @R_404_4148@)         image = CGImageSourceCreate@R_404_4148@AtIndex (isr, (CFDictionaryRef)[NSDictionary dictionaryWithObjectsAndKeys:             [NSNumber numberWithInt: MAX_PIXEL_SIZE],  kCGImageSource@R_404_4148@MaxPixelSize,255); color:inherit">             (ID)kcfBooleanTrue,                       kCGImageSourceCreate@R_404_4148@Withtransform,92); margin-top:0px!important; margin-right:0px!important; margin-bottom:0px!important; margin-left:0px!important; line-height:14px; List-style-type:decimal; padding-top:2px; padding-right:0px; padding-bottom:2px; padding-left:0px">             (ID)kcfBooleanTrue,                       kCGImageSourceCreate@R_404_4148@FromImageAlways,255); color:inherit">             NulL] );         CFRelease(isr);     return image; } + (NSImage*) imageFromCGImageRef:(CGImageRef)image     NSRect imageRect = NSMakeRect(0.0, 0.0, 0.0);     CGContextRef imageContext = nil;     NSImage* newImage = nil; // Get the image dimensions.     imageRect.size.height = CGImageGetHeight(image);     imageRect.size.wIDth = CGImageGetWIDth(image); // Create a new image to receive the Quartz image data.     newImage = [[[NSImage alloc] initWithSize:imageRect.size] autorelease];     [newImage lockFocus]; // Get the Quartz context and draw.     imageContext = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];     CGContextDrawImage(imageContext, *(CGRect*)&imageRect, image);     [newImage unlockFocus];     return newImage; - (CGImageRef)nsImagetoCGImageRef//:(NSImage*)image;     NSData * imageData = [self TIFFRepresentation];     CGImageRef imageRef;     if(imageData)         CGImageSourceRef imageSource =          CGImageSourceCreateWithData(                             (CFDataRef)imageData,  NulL);         imageRef = CGImageSourceCreateImageAtIndex(                                imageSource,255); color:inherit">     return imageRef; BOol)setSmoothingEffect     NSBitmAPImageRep *rep = [[self representations] objectAtIndex: 0];     NSSize size = NSMakeSize ([rep pixelsWIDe], [rep pixelsHigh]);     if(size.wIDth >0 && size.height>0)         [self setSize: size];         return YES;     return NO;  // Generates a 256 by 256 pixel image with a complicated gradIEnt in it. + (NSImage *) prettyGradIEntimage:(NSSize)gradIEntSize     NSImage *newImage = [[self alloc] initWithSize:gradIEntSize];  // In this case, the pixel dimensions match the image size. int pixelsWIDe = gradIEntSize.wIDth; int pixelsHigh = gradIEntSize.height;         NSBitmAPImageRep *bitmapRep =          [[NSBitmAPImageRep alloc]          initWithBitmapDataPlanes: nil  // Nil pointer makes the kit allocate the pixel buffer for us.         pixelsWIDe: pixelsWIDe  // The compiler will convert these to integers, but I just wanted to  make it quite explicit         pixelsHigh: pixelsHigh          bitsPerSample: 8         samplesPerPixel: 4  // Four samples, that is: RGBA         hasAlpha: YES         isPlanar: NO  // The math can be simpler with planar images, but performance suffers..         colorSpacename: NSCalibratedRGBcolorSpace  // A calibrated color space gets us colorSync for free.         bytesPerRow: 0     // Passing zero means "you figure it out."         bitsPerPixel: 32];  // This must agree with bitsPerSample and samplesPerPixel.    char *imageBytes = [bitmapRep bitmapData];  // -bitmapData returns a voID*, not an NSData object ;-) int row = pixelsHigh;     while(row--)         int col = pixelsWIDe;         while(col--)          {             int              pixelindex = 4 * (row * pixelsWIDe + col);             imageBytes[pixelindex + red] = rint(fmod(distance(NSMakePoint(col/1.5,(255-row)/1.5)),255.0));  //red             imageBytes[pixelindex + green] = rint(fmod(distance(NSMakePoint(col/1.5, row/1.5)),0); background-color:inherit">// green             imageBytes[pixelindex + blue] = rint(fmod(distance(NSMakePoint((255-col)/1.5,0); background-color:inherit">// blue             imageBytes[pixelindex + Alpha] = 255;  // Not doing anything tricky with the Alpha value here...         }     [newImage addRepresentation:bitmapRep];     return [newImage autorelease]; float distance(NSPoint aPoint)  // Stole this from some guy named Pythagoras..  Returns the distance of aPoint from the origin.   return sqrt(aPoint.x * aPoint.x + aPoint.y *aPoint.y); //open selecter file panel /*static NSArray* openImagefiles() {      // Get a List of extensions to filter in our NSOpenPanel.     NSOpenPanel* panel = [NSOpenPanel openPanel];     [panel setCanChooseDirectorIEs:YES];    // The user can choose a folder; images in the folder are added recursively.     [panel setCanChoosefiles:YES];     [panel setAllowsMultipleSelection:YES];     if ([panel runModalForTypes:[NSImage imageUnfilteredfileTypes]] == NSOKbutton)         return [panel filenames];     return nil; }*/ @H_404_1391@ 总结

以上是内存溢出为你收集整理的对NSImage的一个扩展全部内容，希望文章能够帮你解决对NSImage的一个扩展所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。