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[英]How to get x and y position of UIImage in UIImageView?
[英]How to place the `UIColor` on `UIImage` at particular (X,Y) position?
我正在嘗試將UIColor
放置在UIImage
特定(X,Y)位置上,
但是沒辦法
在這里,我的代碼如下所示
下面的方法從UIImage
特定(X,Y)位置返回一個UIColor
- (UIColor *)isWallPixel:(UIImage *)image xCoordinate:(int)x yCoordinate:(int)y {
CFDataRef pixelData = CGDataProviderCopyData(CGImageGetDataProvider(image.CGImage));
const UInt8* data = CFDataGetBytePtr(pixelData);
int pixelInfo = ((image.size.width * y) + x ) * 4; // The image is png
UInt8 red = data[pixelInfo]; // If you need this info, enable it
UInt8 green = data[(pixelInfo + 1)]; // If you need this info, enable it
UInt8 blue = data[pixelInfo + 2]; // If you need this info, enable it
UInt8 alpha = data[pixelInfo + 3]; // I need only this info for my maze game
CFRelease(pixelData);
UIColor* color = [UIColor colorWithRed:red/255.0f green:green/255.0f blue:blue/255.0f alpha:alpha/255.0f]; // The
return color;
}
//Original Image, I get image pixels from this image.
UIImage* image = [UIImage imageNamed:@"plus.png"];
//Need convert Image
UIImage *imagedata = [[UIImage alloc]init];
//size of the original image
int Width = image.size.width;
int height = image.size.height;
//need to get this size of another blank image
CGRect rect = CGRectMake(0.0f, 0.0f, Width, height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
for (int i = 0; i <Width; i++) {
for (int j = 0; j < height; j++) {
//Here I got the Image pixel color from below highlighted method
UIColor *colordatra = [self isWallPixel:image xCoordinate:i yCoordinate:j];
CGContextSetFillColorWithColor(context, [colordatra CGColor]);
rect.origin.x = i;
rect.origin.y = j;
CGContextDrawImage(context, rect, imagedata.CGImage);
imagedata = UIGraphicsGetImageFromCurrentImageContext();
}
}
UIGraphicsEndImageContext();
請注意,我想使用某些功能,例如從特定位置獲取UIColor
並將該UIColor
放置在同一位置的另一個空白圖像上。
使用上面的代碼,我無法獲取此信息,請讓我知道我在哪里做錯了。
希望得到滿意的答復,
提前致謝。
通過使用uiView,您可以像這樣進行操作。實際上,您得到的x,y,寬度和高度
uiview *view = [uiview alloc]initwithframe:CGRectMake(x,y,width,height);
view.backgroundcolor =[UIColor colorWithRed:red/255.0f green:green/255.0f blue:blue/255.0f alpha:alpha/255.0f];
[self.YourImageView addsubview:view];
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