I'm using this code to create a filled rectangle with text and adding it to an image
CGRect textRect = CGRectMake(0, p_point.y, p_image.size.width+15, p_image.size.height+10)
[[UIColor colorWithRed:(70/255.0) green:(70/255.0) blue:(70/255.0) alpha:1] set];
CGContextFillRect(UIGraphicsGetCurrentContext(), textRect);
[[UIColor whiteColor] set];
[p_text drawInRect:textRect withFont:font lineBreakMode:NSLineBreakByTruncatingTail alignment:NSTextAlignmentCenter];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
i wish the rectangle will have round corners...
Related
I need some help reversing a triangle cutout.
I can make the rectangle with a triangle cutout on it's right:
using these coordinates:
NSInteger imageWidth=12, imageHeight=22;
NSImage* destImage = [[NSImage alloc] initWithSize:NSMakeSize(imageWidth,imageHeight)];
[destImage lockFocus];
// Constructing the path
NSBezierPath *leftTriangle = [NSBezierPath bezierPath];
[leftTriangle setLineWidth:1.0];
[leftTriangle moveToPoint:NSMakePoint(imageWidth+1, 0.0)];
[leftTriangle lineToPoint:NSMakePoint( 0, imageHeight/2.0)];
[leftTriangle lineToPoint:NSMakePoint( imageWidth+1, imageHeight)];
[leftTriangle closePath];
[[NSColor controlColor] setFill];
[[NSColor clearColor] setStroke];
...
What coordinates would I use to make the cutout on the other side, like this:
UPDATE: Inelegantly solved:
It helped to remember that measurements begin at the bottom left.
NSBezierPath *rightTriangle = [NSBezierPath bezierPath];
[rightTriangle setLineWidth:1.0];
[rightTriangle moveToPoint:NSMakePoint(0.0, 29)];
[rightTriangle lineToPoint:NSMakePoint( imageWidth, 20)];
[rightTriangle lineToPoint:NSMakePoint(0.0, 11)];
How do I draw a blurred shape in Cocoa? Think of a shadow with a blurRadius accompanying a filled path, but without sharp-edged foreground path shape.
What I tried is using a filled path with a shadow, and setting the fill color to transparent (alpha 0.0). But that makes the shadow invisible as well, as it is apparently taking the shadow casting "object's" alpha into account.
This is actually reasonably tricky. I struggled with this for a while until I came up with this category on NSShadow:
#implementation NSShadow (Extras)
//draw a shadow using a bezier path but do not draw the bezier path
- (void)drawUsingBezierPath:(NSBezierPath*) path alpha:(CGFloat) alpha
{
[NSGraphicsContext saveGraphicsState];
//get the bounds of the path
NSRect bounds = [path bounds];
//create a rectangle that outsets the size of the path bounds by the blur radius amount
CGFloat blurRadius = [self shadowBlurRadius];
NSRect shadowBounds = NSInsetRect(bounds, -blurRadius, -blurRadius);
//create an image to hold the shadow
NSImage* shadowImage = [[NSImage alloc] initWithSize:shadowBounds.size];
//make a copy of the shadow and set its offset so that when the path is drawn, the shadow is drawn in the middle of the image
NSShadow* aShadow = [self copy];
[aShadow setShadowOffset:NSMakeSize(0, -NSHeight(shadowBounds))];
//lock focus on the image
[shadowImage lockFocus];
//we want to draw the path directly above the shadow image and offset the shadow so it is drawn in the image rect
//to do this we must translate the drawing into the correct location
NSAffineTransform* transform=[NSAffineTransform transform];
//first get it to the zero point
[transform translateXBy:-shadowBounds.origin.x yBy:-shadowBounds.origin.y];
//now translate it by the height of the image so that it draws outside the image bounds
[transform translateXBy:0.0 yBy:NSHeight(shadowBounds)];
NSBezierPath* translatedPath = [transform transformBezierPath:path];
//apply the shadow
[aShadow set];
//fill the path with an arbitrary black color
[[NSColor blackColor] set];
[translatedPath fill];
[aShadow release];
[shadowImage unlockFocus];
//draw the image at the correct location relative to the original path
NSPoint imageOrigin = bounds.origin;
imageOrigin.x = (imageOrigin.x - blurRadius) + [self shadowOffset].width;
imageOrigin.y = (imageOrigin.y - blurRadius) - [self shadowOffset].height;
[shadowImage drawAtPoint:imageOrigin fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:alpha];
[shadowImage release];
[NSGraphicsContext restoreGraphicsState];
}
#end
I found one implementation which does exactly what I meant online. Written by Sean Patrick O'Brien. It is a category on NSBezierPath, like so:
#interface NSBezierPath (MCAdditions)
- (void)drawBlurWithColor:(NSColor *)color radius:(CGFloat)radius;
#end
#implementation NSBezierPath (MCAdditions)
- (void)drawBlurWithColor:(NSColor *)color radius:(CGFloat)radius
{
NSRect bounds = NSInsetRect(self.bounds, -radius, -radius);
NSShadow *shadow = [[NSShadow alloc] init];
shadow.shadowOffset = NSMakeSize(0, bounds.size.height);
shadow.shadowBlurRadius = radius;
shadow.shadowColor = color;
NSBezierPath *path = [self copy];
NSAffineTransform *transform = [NSAffineTransform transform];
if ([[NSGraphicsContext currentContext] isFlipped])
[transform translateXBy:0 yBy:bounds.size.height];
else
[transform translateXBy:0 yBy:-bounds.size.height];
[path transformUsingAffineTransform:transform];
[NSGraphicsContext saveGraphicsState];
[shadow set];
[[NSColor blackColor] set];
NSRectClip(bounds);
[path fill];
[NSGraphicsContext restoreGraphicsState];
[path release];
[shadow release];
}
#end
This code is downloadable from this blog post. I didn't find it separately as code anywhere online.
I have a simple CALayer subclass (BoxLayer) with this drawLayer method:
- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx {
NSLog(#"drawLayer");
NSGraphicsContext *nsGraphicsContext;
nsGraphicsContext = [NSGraphicsContext graphicsContextWithGraphicsPort:ctx
flipped:NO];
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:nsGraphicsContext];
// ...Draw content using NS APIs...
NSPoint origin = { 21,21 };
NSRect rect;
rect.origin = origin;
rect.size.width = 128;
rect.size.height = 128;
NSBezierPath * path;
path = [NSBezierPath bezierPathWithRect:rect];
[path setLineWidth:4];
[[NSColor whiteColor] set];
[path fill];
[[NSColor grayColor] set];
[path stroke];
[NSGraphicsContext restoreGraphicsState];
}
I then have this awakeFromNib in my NSView subclass:
- (void)awakeFromNib {
CALayer* rootLayer = [CALayer layer];
[self setLayer:rootLayer];
[self setWantsLayer:YES];
box1 = [CALayer layer];
box1.bounds = CGRectMake(0, 0, 70, 30);
box1.position = CGPointMake(80, 80);
box1.cornerRadius = 10;
box1.borderColor = CGColorCreateGenericRGB(255, 0, 0, 1);
box1.borderWidth = 1.5;
[rootLayer addSublayer:box1];
box2 = [BoxLayer layer];
[box2 setDelegate:box2];
[box2 setNeedsDisplay];
[rootLayer addSublayer:box2];
}
My drawLayer is never called though, but why not?
Thank you
Possibly because the frame of your layer seems to be equal to CGRectZero, so the OS might think it's invisible so it doesn't need to draw it.
On a side note, why are going the complicated way of setting the layer's delegate to itself and implementing drawLayer:inContext: instead of using drawInContext: directly?
I have a custom NSView that lives inside of a NSScrollView that is in a NSSplitView. The custom view uses the following drawing code:
- (void)drawRect:(NSRect)dirtyRect {
NSGraphicsContext *ctx = [NSGraphicsContext currentContext];
[ctx saveGraphicsState];
// Rounded Rect
NSRect rect = [self bounds];
NSRect pathRect = NSMakeRect(rect.origin.x + 3, rect.origin.y + 6, rect.size.width - 6, rect.size.height - 6);
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:pathRect cornerRadius:kDefaultCornerRadius];
// Shadow
[NSShadow setShadowWithColor:[NSColor colorWithCalibratedWhite:0 alpha:0.66]
blurRadius:4.0
offset:NSMakeSize(0, -3)];
[[NSColor colorWithCalibratedWhite:0.196 alpha:1.0] set];
[path fill];
[NSShadow clearShadow];
// Background Gradient
NSGradient *gradient = [[NSGradient alloc] initWithStartingColor:[UAColor darkBlackColor] endingColor:[UAColor lightBlackColor]];
[gradient drawInBezierPath:path angle:90.0];
[gradient release];
// Image
[path setClip];
NSRect imageRect = NSMakeRect(pathRect.origin.x, pathRect.origin.y, pathRect.size.height * kLargeImageRatio, pathRect.size.height);
[self.image drawInRect:imageRect
fromRect:NSZeroRect
operation:NSCompositeSourceAtop
fraction:1.0];
[ctx restoreGraphicsState];
[super drawRect:dirtyRect];
}
I have tried every different type of operation but the image still draws on top of the other half of the NSSplitView like so:
…instead of drawing under the NSScrollView. I think this has to do with drawing everything instead of the dirtyRect only, but I don't know how I could edit the image drawing code to only draw the part of it that lies in the dirtyRect. How can I either prevent it from drawing on top, or only draw the dirty rect for this NSImage?
I finally got it. I don't know if it is optimal yet, but I will find out when doing performance testing. I just had to figure out the intersection of the image rect and the dirty rect using NSIntersectionRect, then figuring out which subpart of the NSImage to draw for the drawInRect:fromRect:operation:fraction: call.
Here is the important part:
NSRect imageRect = NSMakeRect(pathRect.origin.x, pathRect.origin.y, pathRect.size.height * kLargeImageRatio, pathRect.size.height);
[self.image setSize:imageRect.size];
NSRect intersectionRect = NSIntersectionRect(dirtyRect, imageRect);
NSRect fromRect = NSMakeRect(intersectionRect.origin.x - imageRect.origin.x,
intersectionRect.origin.y - imageRect.origin.y,
intersectionRect.size.width,
intersectionRect.size.height);
[self.image drawInRect:intersectionRect
fromRect:fromRect
operation:NSCompositeSourceOver
fraction:1.0];
I have an NSBezierPath and I want to draw in inset shadow (similar to Photoshop) inside the path.
Is there anyway to do this? Also, I know you can -stroke paths, but can you stroke inside a path (similar to Stroke Inside in Photoshop)?
Update 3
static NSImage * graydient = nil;
if (!graydient) {
graydient = [[NSImage alloc] initWithSize: NSMakeSize(22, 22)];
[graydient lockFocus];
NSGradient * gradient = [[NSGradient alloc] initWithColorsAndLocations: clr(#"#262729"), 0.0f, clr(#"#37383a"), 0.43f, clr(#"#37383a"), 1.0f, nil];
[gradient drawInRect: NSMakeRect(0, 4.179, 22, 13.578) angle: 90.0f];
[gradient release];
[graydient unlockFocus];
}
NSColor * gcolor = [NSColor colorWithPatternImage: graydient];
[gcolor set];
NSShadow * shadow = [NSShadow new];
[shadow setShadowColor: [NSColor colorWithDeviceWhite: 1.0f alpha: 1.0f]];
[shadow setShadowBlurRadius: 0.0f];
[shadow setShadowOffset: NSMakeSize(0, 1)];
[shadow set];
[path fill];
[NSGraphicsContext saveGraphicsState];
[[path pathFromIntersectionWithPath: [NSBezierPath bezierPathWithRect: NSInsetRect([path bounds], 0.6, 0)]] setClip];
[gcolor set];
[shadow setShadowOffset: NSMakeSize(0, 1)];
[shadow setShadowColor: [NSColor blackColor]];
[shadow set];
[outer stroke];
[NSGraphicsContext restoreGraphicsState];
[NSGraphicsContext saveGraphicsState];
[[NSGraphicsContext currentContext] setCompositingOperation: NSCompositeSourceOut];
[shadow set];
[[NSColor whiteColor] set];
[inner fill];
[shadow set];
[inner fill];
[NSGraphicsContext restoreGraphicsState];
This is my final result. It looks pretty good. I had to change the shadow to White # 1.0 Alpha to make it work. Even though the shadow alpha norm for menu bar items is 0.5, it doesn't look half bad.
Many thanks go out to Joshua Nozzi.
I think you can do this by setting clip on the bezier path to use it as a mask and stroking the shadow, then adding a normal stroke if desired.
Update based on updated code:
Here you go. I'm feeling procrastinate-y tonight. :-)
// Describe an inset rect (adjust for pixel border)
NSRect whiteRect = NSInsetRect([self bounds], 20, 20);
whiteRect.origin.x += 0.5;
whiteRect.origin.y += 0.5;
// Create and fill the shown path
NSBezierPath * path = [NSBezierPath bezierPathWithRect:whiteRect];
[[NSColor whiteColor] set];
[path fill];
// Save the graphics state for shadow
[NSGraphicsContext saveGraphicsState];
// Set the shown path as the clip
[path setClip];
// Create and stroke the shadow
NSShadow * shadow = [[[NSShadow alloc] init] autorelease];
[shadow setShadowColor:[NSColor redColor]];
[shadow setShadowBlurRadius:10.0];
[shadow set];
[path stroke];
// Restore the graphics state
[NSGraphicsContext restoreGraphicsState];
// Add a nice stroke for a border
[path setLineWidth:1.0];
[[NSColor grayColor] set];
[path stroke];