Search Results

Search found 716 results on 29 pages for 'rect'.

Page 21/29 | < Previous Page | 17 18 19 20 21 22 23 24 25 26 27 28  | Next Page >

• Exporting to PNG from Adobe Illustrator cutting off edges

  - by Luther Baker

  I created a 40px x 40px image in Adobe Illustrator CS4. I saved as an .ai file and then tried to export as a PNG. Adobe Illustrator automatically crops the background and tightens the export to a rect around all the objects which if fine. In this case, I am not working edge to edge so my image is not quite 40px wide. But, unfortunately, Illustrator is not exporting the entire image. I end up with an image that is 34px wide. Indeed, the icon I draw starts on the left hand side but the right edge of my object cut off. Any ideas why this is happening? I can't imagine Illustrator CS4 can't correctly to export to PNG.

  Read the article

• CATiledLayer: Determining levelsOfDetail when in drawLayer

  - by Russell Quinn

  I have a CATiledLayer inside a UIScrollView and all is working fine. Now I want to add support for showing different tiles for three levels of zooming. I have set levelsOfDetail to 3 and my tile size is 300 x 300. This means I need to provide three sets of tiles (I'm supplying PNGs) to cover: 300 x 300, 600 x 600 and 1200 x 1200. My problem is that inside "(void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx" I cannot work out which levelOfDetail is currently being drawn. I can retrieve the bounds currently required by using CGContextGetClipBoundingBox and usually this requests a rect for one of the above sizes, but at layer edges the tiles are usually smaller and therefore this isn't a good method. Basically, if I have set levelsOfDetail to 3, how do I find out if drawLayer is requesting level 1, 2 or 3 when it's called? Thanks, Russell.

  Read the article

• What is an Efficient algorithm to find Area of Overlapping Rectangles

  - by namenlos

  My situation Input: a set of rectangles each rect is comprised of 4 doubles like this: (x0,y0,x1,y1) they are not "rotated" at any angle, all they are "normal" rectangles that go "up/down" and "left/right" with respect to the screen they are randomly placed - they may be touching at the edges, overlapping , or not have any contact I will have several hundred rectangles this is implemented in C# I need to find The area that is formed by their overlap - all the area in the canvas that more than one rectangle "covers" (for example with two rectangles, it would be the intersection) I don't need the geometry of the overlap - just the area (example: 4 sq inches) Overlaps shouldn't be counted multiple times - so for example imagine 3 rects that have the same size and position - they are right on top of each other - this area should be counted once (not three times) Example The image below contains thre rectangles: A,B,C A and B overlap (as indicated by dashes) B and C overlap (as indicated by dashes) What I am looking for is the area where the dashes are shown - AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA--------------BBB AAAAAAAAAAAAAAAA--------------BBB AAAAAAAAAAAAAAAA--------------BBB AAAAAAAAAAAAAAAA--------------BBB BBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBB BBBBBB-----------CCCCCCCC BBBBBB-----------CCCCCCCC BBBBBB-----------CCCCCCCC CCCCCCCCCCCCCCCCCCC CCCCCCCCCCCCCCCCCCC CCCCCCCCCCCCCCCCCCC CCCCCCCCCCCCCCCCCCC

  Read the article

• underline text in UIlabel

  - by semix

  How to underline a text that could be multiple lines of string? I find some people suggest UIWebView, but it is obviously too heave a class for just text rendering. My thoughts was to figure out the start point and length of each string in each line. And draw a line under it accordingly. I meet problems at how to figure out the length and start point forthe string. Can anybody help me on this? I try to use UILable::textRectForBounds, this should be the drawing bounding rect for the text right? Then I have to work on the aligment ? How can I get the start point of each line when it is center-justified and right justfied? I am new here, so thank in advance.

  Read the article

• Using PDF in iPad

  - by RVN

  Has Anyone tried using PDF in iPad Application, using CGPDf functions. I have used this in iPhone and it works perfectly , but when i use the same code in iPad , the Page are Shrunk in size, after a try outs i set the Scale as follows CGContextScaleCTM(context,1.85, -1.80); This time the it fits the screen perfectly , but that was just a trial and error , why does it not fit the screen as in iPhone, i have set the view size correctly too. Anyone having a clue about it please let me know. and also this is my drawRect method where i am drawing the PDF page void drawRect:(CGRect)rect{ UIGraphicsBeginPDFPage(); CGContextRef context = UIGraphicsGetCurrentContext(); CGPDFPageRef page = CGPDFDocumentGetPage(pdf, pageNumber); CGContextSaveGState(context); CGContextTranslateCTM(context, 1.0, self.frame.size.height); CGContextScaleCTM(context,1.0, -1.0); CGContextDrawPDFPage(context, page); CGContextRestoreGState(context); } Thanks

  Read the article

• Core Text's CTFramesetterSuggestFrameSizeWithConstraints() returns incorrect size everytime

  - by nsapplication

  According to the docs, CTFramesetterSuggestFrameSizeWithConstraints () "determines the frame size needed for a string range". Unfortunately the size returned by this function is never accurate. Here is what I am doing: NSAttributedString *string = [[[NSAttributedString alloc] initWithString:@"lorem ipsum" attributes:nil] autorelease]; CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef) string); CGSize textSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, CFRangeMake(0,0), NULL, CGSizeMake(rect.size.width, CGFLOAT_MAX), NULL); The returned size always has the correct width calculated, however the height is always slightly shorter than what is expected. Is this the correct way to use this method? Is there any other way to layout Core Text? Seems I am not the only one to run into problems with this method. See https://devforums.apple.com/message/181450.

  Read the article

• WPF absolute positioning in InkCanvas

  - by Nilu

  Hi, I'm trying to position a rectangle in an InkCanvas. I am using the following method. Unfortunately when I add the rectangle it gets displayed at (0,0). Although when I query to see the whether the left property is 0 I get a non zero values. Does anyone know why this might be? Cheers, Nilu InkCanvas _parent = new InkCanvas(); private void AddDisplayRect(Color annoColour, Rect bounds) { Rectangle displayRect = new Rectangle(); Canvas.SetTop(displayRect, bounds.Y); Canvas.SetLeft(displayRect, bounds.X); // check to see if the property is set Trace.WriteLine(Canvas.GetLeft(displayRect)); displayRect.Width = bounds.Width; displayRect.Height = bounds.Height; displayRect.Stroke = new SolidColorBrush(annoColour); displayRect.StrokeThickness = 1; _parent.Children.Add(displayRect); }

  Read the article

• customize uipopovercontroller in ipad

  - by Jaimin

  i want to change the image of popover. it is having blue tint at the top so i want it to be of different color. how can i do it... - (void)presentPopoverFromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated can i do it with this method.. make my own view and place a image in that view. i read in some posts that it is not possible to change color and also i didnt fine any instance method of UIPopOverController class to do this.. thanks in advance.

  Read the article

• UIImage created from CGImageRef fails with UIImagePNGRepresentation

  - by Ari J.R.

  I'm using the following code to crop and create a new UIImage out of a bigger one. I've isolated the issue to be with the function CGImageCreateWithImageInRect() which seem to not set some CGImage property the way I want. :-) The problem is that a call to function UIImagePNGRepresentation() fails returning a nil. CGImageRef origRef = [stillView.image CGImage]; CGImageRef cgCrop = CGImageCreateWithImageInRect( origRef, theRect); UIImage *imgCrop = [UIImage imageWithCGImage:cgCrop]; ... NSData *data = UIImagePNGRepresentation ( imgCrop); -- libpng error: No IDATs written into file Any idea what might wrong or alternative for cropping a rect out of UIImage? Many thanks!

  Read the article

• UIView drawRect; class variables out of scope

  - by Toby Wilson

  Short & sweet version of my last question in light of new information. I have a UIVIew with an init and a drawrect method (and another thread and a bunch of other stuff, but I'll keep it short & sweet). All of the class variables that I alloc and init in the -(id)init method are out of scope/nil/0x0 in the drawRect method, and I am unable to access them. For example; In the interface: NSObject* fred; In the implementation: -(id)init { if(self == [super init]) { fred = [[NSObject alloc] init]; } return self; } -(void)drawRect:(CGRect)rect { NSLog(@"Fred is retained %i times",[fred retainCount]); //FAIL NSLog(@"But his variable is actually just pointing at uninitialised 0x0, so you're not reading this in the debugger because the application has crashed before it got here." } Should add that init IS being called before drawRect also. Anyone have any ideas?

  Read the article

• Freehand drawing with Quartz 2D

  - by qutaibah

  I am trying to develop a simple freehand-drawing app for red-marking some of my images. Below is a method that is called from within the drawRect. I want to ask if there is a way to avoid add the path every time the path is redrawn? Also, the way the draw method is set up, the drawing gets a bit slow and choopy after a few seconds. How can I improve the smoothness of the drawn path? thanks -(void)freehandDraw:(CGContextRef)context inRect:(CGRect)rect { CGPathAddLineToPoint( path, NULL, drawTip.x, drawTip.y); CGContextAddPath( context, path); CGContextStrokePath(context); } // method

  Read the article

• composite colors : CALayer and blend mode on iPhone

  - by Ali

  I'm trying to use core image on the iphone. I'm able to composite my colors using quartz to draw an uiview, but i want to separate each component into CALayer (UIview consume more resources). So i have a white mask i want to use to filter a background bitmap, and i want to try diffrent blending mode. UNfortunately, the layers are only "adding" their colors. Here is my code : @implementation WhiteLayerHelper - (void)drawLayer:(CALayer *)theLayer inContext:(CGContextRef)myContext { // draw a white overlay, with special blending and alpha values, so that the saturation can be animated CGContextSetBlendMode(myContext,kCGBlendModeSaturation); CGContextSetRGBFillColor(myContext,1.0,1.0,1.0,0.9); CGContextFillRect(myContext,[UIScreen mainScreen].bounds); } @end And here is the main view drawrect code, where i use my CALayer : - (void)drawRect:(CGRect)rect { //get the drawing context CGContextRef myContext = UIGraphicsGetCurrentContext(); // draw the background [self fillContext:myContext withBounds:m_overlayRect withImage:m_currentImage]; [whiteLayer renderInContext:myContext]; } Is there something wrong ?

  Read the article

• Placement coordinates of bitmapData in AS3

  - by TheDarkIn1978

  i've programatically created a vector graphic (rect), repositioned the graphic, and set up an MOUSE_MOVE eventListener to trace color information of the graphic using getPixel(). however, the bitmapData is placed at 0,0 of the stage and i don't know how to move it so that it matches the graphic's location. var coloredSquare:Sprite = new GradientRect(200, 200, 0xFFFFFF, 0x000000, 0xFF0000, 0xFFFF00); coloredSquare.x = 100; addChild(coloredSquare); var coloredSquareBitmap:BitmapData = new BitmapData(coloredSquare.width, coloredSquare.height, true, 0); coloredSquareBitmap.draw(coloredSquare); coloredSquare.addEventListener(MouseEvent.MOUSE_MOVE, readColor); function readColor(evt:Event):void { var pixelValue:uint = coloredSquare.getPixel(mouseX, mouseY); trace(pixelValue.toString(16)); }

  Read the article

• Clipping different parts of an image with path

  - by huggie

  I've recently asked a question about clipping an image via path at view's drawRect method. http://stackoverflow.com/questions/2570653/iphone-clip-image-with-path Krasnyk's code is copied below. - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGMutablePathRef path = CGPathCreateMutable(); //or for e.g. CGPathAddRect(path, NULL, CGRectInset([self bounds], 10, 20)); CGPathAddEllipseInRect(path, NULL, [self bounds]); CGContextAddPath(context, path); CGContextClip(context); CGPathRelease(path); [[UIImage imageNamed:@"GC.png"] drawInRect:[self bounds]]; } It works very well. However, when my image is larger than the view itself, how do I show different parts of the image? I tried tweaking around with translation on the locations (show as bounds above) of ellipse and/or UIImage drawInRect but some complex effects (Unwanted clipping, weird elipse size) I can't explain happens.

  Read the article

• UIButton not firing selector if I draw it using CALayer

  - by Horatiu Paraschiv

  Hi everybody I create this button like this: _myButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain]; DLBadgeLayerDelegate *layerDelegate = [[DLBadgeLayerDelegate alloc] init]; _myButton.frame = CGRectMake(0.0 , 0.0, 100.0, 100.0); [_myButton addTarget:self action:@selector(myButtonTapped:) forControlEvents:UIControlEventTouchUpInside]; _myButton.layer.backgroundColor = [[UIColor redColor] CGColor]; _myButton.center = CGPointMake(10.0, 10.0); [self addSubview:_myButton]; [_myButton release]; The button appears on the screen but if I tap on it nothing happens. If I just create a Rounded rect button instead with no custom drawing on its layer or if I just leave the layer line of code out all works well. Do you have any Idea why do I get this behaviour as I would like to do some custom drawing in the button's layer?

  Read the article

• How to make the subview in a UIScrollView to refresh when we zoom it?

  - by wolverine

  I have subclassed UIView object inside a uiscrollview which displays a pdf page. I can zoom that page. But when I do so, the inside view is zoomed and is getting blurred. I understood that the inner view shud be refreshed and i called setNeedsDisplay. But no change have happened and its the same even now. Below is the code for drawRect for the subclassed uiview. - (void)drawRect:(CGRect)rect { if(document)//the pdf document object { CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextSaveGState(ctx); CGContextTranslateCTM(ctx, 0.00, [self bounds].size.height); NSLog(@"%f",[self bounds].size.height); CGContextScaleCTM(ctx, 1.0, -1.0); CGContextConcatCTM(ctx, CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, [self bounds], 0, true)); CGContextDrawPDFPage(ctx, page); CGContextRestoreGState(ctx); } }

  Read the article

• Gradient fill bitmap and CreatePatternBrush just gives black fill instead of gradient

  - by mtopley

  I'm trying to create a Gradient Brush in windows mobile as follows: HBITMAP hBitmap = CreateBitmap(16, 16, 1, 16, NULL); HDC hDC = CreateCompatibleDC(NULL); HBITMAP hPrevious = SelectObject(hDC,hBitmap); TRIVERTEX vert[2]; GRADIENT_RECT gRect; ... fill in vert and gRect GradientFill(hDC, vert, 2,&gRect, 1, Direction); SelectObject(hDC, hPrevious); Delete(hDC); HBRUSH hPatternBrush = CreatePatternBrush(hBitmap); HDC hDC = BeginPaint(hWnd, &ps); SelectObject(hDC, hPatternBrush); RoundRect(hDC, ...); EndPaint(hWND, &ps); This code create a round rect with a black background, not the pattern brush. I can draw the hBitmap which is used to create the brush and it draws the gradient. Anyone got a solution?

  Read the article

• How to fill a path with gradient in drawRect:?

  - by Derrick

  filling a path with a solid color is easy enough: CGPoint aPoint; for (id pointValue in points) { aPoint = [pointValue CGPointValue]; CGContextAddLineToPoint(context, aPoint.x, aPoint.y); } [[UIColor redColor] setFill]; [[UIColor blackColor] setStroke]; CGContextDrawPath(context, kCGPathFillStroke); I'd like to draw a gradient instead of solid red, but I am having trouble. I've tried the code listed in the Question/Answer: http://stackoverflow.com/questions/422066/gradients-on-uiview-and-uilabels-on-iphone which is: CAGradientLayer *gradient = [CAGradientLayer layer]; [gradient setFrame:rect]; [gradient setColors:[NSArray arrayWithObjects:(id)[[UIColor blueColor] CGColor], (id)[[UIColor whiteColor] CGColor], nil]]; [[self layer] setMasksToBounds:YES]; [[self layer] insertSublayer:gradient atIndex:0]; However, this paints the entire view that this is in with the gradient, covering up my original path.

  Read the article

• Are primitive types garbage collected in Android?

  - by snctln

  I know this may be a dumb question, but my background is more in c++ and managing my own memory. I am currently cutting down every single allocation that I can from one of my games to try and reduce the frequency of garbage collection and perceived "lag", so for every variable that I create that is an Object (String and Rect for example) I am making sure that I create it before hand in my constructor and not create temporary variables in simple 10 line functions... (I hope that makes sense) Anyways I was working though it some more tonight and I realized that I may be completely wrong about my assumption on garbage collection and primitive types (int, boolean, float) are these primitive type variables that I create in a 10 line function that gets called 20 times a second adding to my problem of garbage collection? So a year ago every few seconds I would see a message in logcat like GC freed 4010 objects / 484064 bytes in 101ms Now I see that message every 15-90 seconds or so... So to rephrase my question: Are primitive types (int, float, boolean, etc) included when seeing this message?

  Read the article

• drawRect context Error

  - by user361228

  Hi, I heard that a lot of people get a context error by not using drawRect Now I have this: - (void)drawRect:(CGRect)rect { NSLog(@"drawRect: Starts"); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0); CGContextSetLineWidth(context, 3.0); CGContextMoveToPoint(context, lineStart.x, lineStart.y); CGContextAddLineToPoint(context, lineEnd.x, lineEnd.y); CGContextStrokePath(context); } Error: <Error>: CGContextSetRGBStrokeColor: invalid context Which had work on previous programs, but not on this one. Whats different: I have a view controller, which calls this UIView: -(void)createLine:(CGPoint)start:(CGPoint)end { NSLog(@"createLine: Starts"); lineEnd = start; lineStart = end; self = [super initWithFrame:drawRect:CGRectMake(fmin(lineStart.x, lineEnd.x), fmin(lineStart.y, lineEnd.y), fabs(lineStart.x - lineEnd.x), fabs(lineStart.y - lineEnd.y))]; } This is my first question, and I am not sure how much info code I should be putting here so be easy on me :D Thanks

  Read the article

• How do I size a UITextView to it's content?

  - by drewh

  Is there a good way to adjust the size of a UITextView to conform to it's content? Say for instance I have a UITextView that contains one line of text: "Hello world" I then add another line of text: "Goodbye world" Is there a good way in Cocoa Touch to get the rect that will hold all of the lines in the text view so that I can adjust the parent view accordingly? As another example, look at the Notes field for events in the Calendar application--note how the cell (and the UITextView it contains) expands to hold all lines of text in the notes string.

  Read the article

• Getting Tap/Touch Position when selecting a TableView cell

  - by Omer

  Hi, hope to get some help here because this is something that really makes me mad... I have a view with a tableView, and when I tap a cell I want to present a popOver window pointing the arrow to the cell I tapped. the things that I think I need is: 1- the position of the cell in the screen (not in the view, because on large tables the Y value of the cell's rect could be grater than screen hight) or 2- a CGPoint or something similar that represents the point in the screen I tapped. I can't figured this out, and makes me really mad!!! Any help will very very very very usefull. Have a nice day.

  Read the article

• how to load an image to a grid using pygame, instead of just using a fill color?

  - by yao jiang

  I am trying to create a "map of a city" using pygame. I want to be able to put images of buildings in specific grid coords rather than just filling them in with a color. This is how I am creating this map grid: def clear(): for r in range(rows): for c in range(rows): if r%3 == 1 and c%3 == 1: color = brown; grid[r][c] = 1; else: color = white; grid[r][c] = 0; pygame.draw.rect(screen, color, [(margin+width)*c+margin, (margin+height)*r+margin, width, height]) pygame.display.flip(); Now how do I put images of buildings in those brown colored grids at those specific locations? I've tried some of the samples online but can't seem to get them to work. Any help is appreciated. If anyone have a good source for free sprites that I can use for pygame, please let me know. Thanks!

  Read the article

• How to use NSString drawInRect to centre text?

  - by Steve Folly

  How can I draw a string centred within a rect? I've started off with: (an extract from the drawRect method of my custom view) NSString* theString = ... [theString drawInRect:theRect withAttributes:0]; [theString release]; Now I'm assuming I need to set up some attributes. I've had a look through Apple's Cocoa documentation, but it's a bit overwhelming and can't find anything for how to add paragraph styles to the attributes. Also, I can only find horizontal alignment, what about vertical alignment? Thanks.

  Read the article

• How do I MOVE a circle drawn in a subclass of UIView by overwriting the method "drawRect"??

  - by Christoph v

  hi, I'm trying to figure out what i'm doing wrong but i just don't get it. Here is what i want to do: I want to draw a circle somewhere on the screen of the iphone and then i want the circle always to be displayed at the position where the user currently taps on the screen. I started by creating a subclass of UIView and adding the following lines into the "drawRect" method: - (void)drawRect:(CGRect)rect { //Create the main view! CGContextRef mainscreen = UIGraphicsGetCurrentContext(); //Draw the dot //will be a circle cause rectangle is a square CGRect dotRect = CGRectMake(50, 80, 100, 100); [[UIColor blueColor] set]; CGContextStrokeEllipseInRect(mainscreen, dotRect); CGContextFillEllipseInRect(mainscreen, dotRect); } The appears just fine but now i have no idea how to make it move around on the screen i've tried serveral things and nothing worked pls help!

  Read the article

< Previous Page | 17 18 19 20 21 22 23 24 25 26 27 28  | Next Page >