我正在开发拼图类型的游戏,我有两个图像用于掩蔽,我已经实现了这个用于掩蔽的代码
- (UIImage*) maskImage:(UIImage *)image withMaskImage:(UIImage*)maskImage {
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGImageRef maskImageRef = [maskImage CGImage];
CGContextRef mainViewContentContext = CGBitmapContextCreate (NULL, maskImage.size.width, maskImage.size.height, 8, 0, colorSpace, kCGImageAlphaPremultipliedLast);
if (mainViewContentContext==NULL)
return NULL;
CGFloat ratio = 0;
ratio = maskImage.size.width/ image.size.width;
if(ratio * image.size.height < maskImage.size.height) {
ratio = maskImage.size.height/ image.size.height;
}
CGRect rect1 = {{0, 0}, {maskImage.size.width, maskImage.size.height}};
CGRect rect2 = {{-((image.size.width*ratio)-maskImage.size.width)/2,-((image.size.height*ratio)-maskImage.size.height)/2},{image.size.width*ratio, image.size.height*ratio}};
CGContextClipToMask(mainViewContentContext, rect1, maskImageRef);
CGContextDrawImage(mainViewContentContext, rect2, image.CGImage);
CGImageRef newImage = CGBitmapContextCreateImage(mainViewContentContext);
CGContextRelease(mainViewContentContext);
UIImage *theImage = [UIImage imageWithCGImage:newImage];
CGImageRelease(newImage);
return theImage;
}
+
=
这是我屏蔽后得到的最终结果。
现在我想以参数方式裁剪图像等(通过透明度裁剪图像)。
如果有人已经实现了这样的代码或关于这个场景的任何想法,请分享。
谢谢。
我正在使用这行代码作为Guntis Treulands 的建议
int i=1;
for (int x=0; x<=212; x+=106) {
for (int y=0; y<318; y+=106) {
CGRect rect = CGRectMake(x, y, 106, 106);
CGRect rect2x = CGRectMake(x*2, y*2, 212, 212);
UIImage *orgImg = [UIImage imageNamed:@"cat@2x.png"];
UIImage *frmImg = [UIImage imageNamed:[NSString stringWithFormat:@"%d@2x.png",i]];
UIImage *cropImg = [self cropImage:orgImg withRect:rect2x];
UIImageView *tmpImg = [[UIImageView alloc] initWithFrame:rect];
[tmpImg setUserInteractionEnabled:YES];
[tmpImg setImage:[self maskImage:cropImg withMaskImage:frmImg]];
[self.view addSubview:tmpImg];
i++;
}
}
orgImg 是原始猫图像,frmImg 框架用于保存单个部件,在 photoshop 中蒙版,cropImg 是原始 cat@2x.png 的 106x106 裁剪图像。
我的裁剪功能如下
- (UIImage *) cropImage:(UIImage*)originalImage withRect:(CGRect)rect {
return [UIImage imageWithCGImage:CGImageCreateWithImageInRect([originalImage CGImage], rect)];
}