Question

我使用以下函数来旋转NSImage。它使用块代码以便在视网膜上正确渲染。现在的问题是它在非视网膜屏幕上呈现模糊。

我尝试检查视网膜显示器[NSWindow backingScaleFactor]，然后在非视网膜显示器上使用非阻滞方法，但是如果用户有视网膜Mac就不能使用它但是显示到外部非视网膜显示器，检查支持ScaleFactor报告视网膜屏幕。然后我在Apple的开发者网站上找到了这个文档：

支持高分辨率的API https://developer.apple.com/library/mac/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/APIs/APIs.html

但坦率地说，这是不可理喻的。如何修改以下功能，以便在非视网膜显示屏上不模糊？

- (NSImage *)imageRotatedByDegrees:(CGFloat)degrees {
// calculate the bounds for the rotated image
NSRect imageBounds = {NSZeroPoint, [self size]};
NSBezierPath *boundsPath = [NSBezierPath bezierPathWithRect:imageBounds];
NSAffineTransform *transform = [NSAffineTransform transform];

[transform rotateByDegrees:degrees];
[boundsPath transformUsingAffineTransform:transform];

NSRect rotatedBounds = {NSZeroPoint, [boundsPath bounds].size};

// center the image within the rotated bounds
imageBounds.origin.x = NSMidX(rotatedBounds) - (NSWidth (imageBounds) / 2);
imageBounds.origin.y = NSMidY(rotatedBounds) - (NSHeight (imageBounds) / 2);

NSImage *rotatedImage = [NSImage imageWithSize:rotatedBounds.size flipped:NO drawingHandler:^BOOL (NSRect dstRect) {
    // set up the rotation transform
    NSAffineTransform *transform=[NSAffineTransform transform];
    [transform translateXBy:+(NSWidth(rotatedBounds) / 2) yBy:+(NSHeight(rotatedBounds) / 2)];
    [transform rotateByDegrees:degrees];
    [transform translateXBy:-(NSWidth(rotatedBounds) / 2) yBy:-(NSHeight(rotatedBounds) / 2)];

    // draw the original image, rotated, into the new image
    [transform concat];
    [self drawInRect:imageBounds fromRect:NSZeroRect operation:NSCompositeCopy fraction:1.0];
    return YES;
}];

return rotatedImage;
}

由于

Answer 1

试试这个

（NSImage *）rotateImagedByDegrees：（CGFloat）degrees图像：（NSImage *）sourceImage {

NSImage *image = sourceImage;

if (degrees == 0)
{
    return image;
}
else
{

    NSRect imageBounds = {NSZeroPoint, [sourceImage size]};
    NSSize rotatedSize = NSMakeSize(sourceImage.size.height, sourceImage.size.width) ;
    NSImage* rotatedImage = [[NSImage alloc] initWithSize:rotatedSize] ;

    NSBezierPath* boundsPath = [NSBezierPath bezierPathWithRect:imageBounds];
    NSAffineTransform* transform = [NSAffineTransform transform];
    [transform rotateByDegrees:-1.0 * degrees];
    [boundsPath transformUsingAffineTransform:transform];
    NSRect rotatedBounds = {NSZeroPoint, [boundsPath bounds].size};
    imageBounds.origin.x = NSMidX(rotatedBounds) - (NSWidth(imageBounds) / 2);
    imageBounds.origin.y = NSMidY(rotatedBounds) - (NSHeight(imageBounds) / 2);

    rotatedImage = [NSImage imageWithSize:rotatedBounds.size flipped:NO drawingHandler:NO];

    NSAffineTransform* transform1 = [NSAffineTransform transform];
    [transform1 translateXBy:+(NSWidth(rotatedBounds) / 2) yBy:+(NSHeight(rotatedBounds) / 2)];
    [transform1 rotateByDegrees:-1.0 * degrees];
    [transform1 translateXBy:-(NSWidth(rotatedBounds) / 2) yBy:-(NSHeight(rotatedBounds) / 2)];
    [rotatedImage lockFocus] ;
    [transform1 concat] ;

    [sourceImage drawInRect:imageBounds
                   fromRect:NSMakeRect(0.0, 0.0, [sourceImage size].width, [sourceImage size].height)
                  operation:NSCompositeSourceOver fraction:1.0];

    [rotatedImage unlockFocus] ;
    return rotatedImage;

} }

在非视网膜上使用块码模糊的NSImage旋转

1 个答案: