quartz-graphics

I have a triangle solver, I want a way to use the values I get from the answer to draw a triangle to the screen that matches it. If you subclass a UIView you can implement something like this in drawRect to draw a triangle: -(void)drawRect:(CGRect)rect { CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextBeginPath(ctx); CGContextMoveToPoint (ctx, CGRectGetMinX(rect), CGRectGetMinY(rect)); // top left CGContextAddLineToPoint(ctx, CGRectGetMaxX(rect), CGRectGetMidY(rect)); // mid right CGContextAddLineToPoint(ctx, CGRectGetMinX(rect), CGRectGetMaxY(rect)); // bottom left

Are there any alternatives to Core-Plot for drawing graphs in iPhone SDK? I am having hard time integrating core-plot in my app. Lot of issues. Can you please suggest some alternatives to core-plot? meetpd Some of the alternatives that I found were: http://sebkade.wordpress.com/2010/05/06/basic-graph-class-for-iphone/ http://www.rgraph.net/ http://www.ivisualization.com/ http://www.vvi.com/apps/vvidget http://cocoacontrols.com/platforms/ios/controls/tapku-graph (thanks Sudo for this link) http://www.shinobicontrols.com/ (latest addition) https://github.com/sweetynebhwani/deSimpleChart These

I've got 4 different iPhone/Cocoa/Core Animation/Objective-C books in front of me, along with numerous sample code from the web. Yet somehow I still feel like I'm missing some fundamental understanding of how drawing works in Quartz 2D . Is drawRect() meant to simply be a hook in which to execute your drawing code? Or is this method supposed to also redraw regions that are "damaged", and need repainting? Can I just draw my stuff once and then it "sticks", or must I repaint the whole scene at any time via drawRect() ? Java's Graphics2D object works this way- you must draw your whole "image"

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: Gradients on UIView and UILabels On iPhone which is: CAGradientLayer *gradient = [CAGradientLayer layer]; [gradient setFrame:rect]; [gradient setColors:[NSArray

I wonder if someone can distinguish precisely between these? For my understanding, Core Graphics is just a "Framework Package" which contains Quartz Core and Quartz 2D. But I'm not sure about if Quartz 2D actually is Quartz Core? Maybe someone can draw some lines there? What makes up the differences between these? When looking at the documentation, I see Quartz Core is listing up all the Core Animation stuff only. So Quartz Core == Core Animation? Brad Larson From the Quartz 2D Programming Guide : The Quartz 2D API is part of the Core Graphics framework, so you may see Quartz referred to as

I am working with unod redo operations on CgLayer, I have tried some code, but not able to get it working, dont know , where I am getting wrong, below is my code, which i have written this is my drawRect function - (void)drawRect:(CGRect)rect { m_backgroundImage = [UIImage imageNamed:@"bridge.jpg"]; CGPoint drawingTargetPoint = CGPointMake(0,0); [m_backgroundImage drawAtPoint:drawingTargetPoint]; switch(drawStep) { case DRAW: { CGContextRef context = UIGraphicsGetCurrentContext(); if(myLayerRef == nil) { myLayerRef = CGLayerCreateWithContext(context, self.bounds.size, NULL); }

I'm having a memory leak when using this custom method which returns a CGImageRef. I can't release "cgImage" properly because I have to return it. What chould I do ? - (CGImageRef)rectRoundedImageRef:(CGRect)rect radius:(int)radius { CGSize contextSize = CGSizeMake(rect.size.width, rect.size.height); CGFloat imageScale = (CGFloat)1.0; CGFloat width = contextSize.width; CGFloat height = contextSize.height; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, width * imageScale, height * imageScale, 8, 0, colorSpace,