drawing

问题 I'm trying to draw a checkmark in green with UIKit, but it is drawn in black instead. Here is the code: [[UIColor greenColor] set]; [@"✔" drawAtPoint:CGPointZero withFont:[UIFont systemFontOfSize:[UIFont systemFontSize]]]; Other strings are properly drawn in green with this method. I suspect that the checkmark glyph contains color information that overrides my choice of fill color, but drawing the same glyph with color in an UIWebView works. Is there a way to get the checkmark drawn in green

问题 Suppose i have drawn a bitmap image or simple circle on my canvas. How can i set OnTouchListener to check if my drawing has been touched? Since i will be drawing multiple circles on the canvas, I want each one of them to have some unique id so i can work accordingly. 回答1: You can't easily do this with canvas. You should handle touch events by yourself and check which circle you touch based on their coordinates/size/z-index. But you can make things easier if every circle will be a single view.

问题 In my app I create a canvas and add some bitmaps on it. The problem is that the objects are adding why touch the screen. So on one screens they appear on the middle on different the same, but their position in pixels are different. I mean that I got tablet and smartphone. When I touch one the object appear on both devices (multiplayer) but its not in the same place, because its passing the position by x and y. If someone understand what I mean, can you help me? Probably it must have something

问题 I have a project where i have to create a 4 way split screen using pygame. On this screen i have to draw the same image on each of the screen just have different view of the image. I just can not figure out how to create this 4 way split screen using pygame. I need my screen to be divided like above so i can draw my points onto each section. I have been looking around and I can not find anything like this so any help would be great thanks 回答1: In addition to the surface you have that gets

问题 How Would I go about placing text on the windows desktop? I've been told that GetDesktopWindow() is what I need but I need an example. 回答1: I'm assuming your ultimate goal is displaying some sort of status information on the desktop. You will have to do either: Inject a DLL into Explorer's process and subclass the desktop window (the SysListView32 at the bottom of the Progman window's hierarchy) to paint your text directly onto it. Create a nonactivatable window whose background is painted

问题 I have an NSSegmentedControl(todayButton) that contains an image. I'm trying to draw some text onto the image using the following: NSImage *img = [todayButton imageForSegment:0] [img lockFocus] [@"15" drawAtPoint:NSZeroPoint withAttributes:nil] [img unlockFocus] [img setTemplate:YES] The image gets set as a template and no errors are thrown but no text appears on the image. 回答1: I may be entirely wrong, but my gut tells me you may be running into NSImage caching issues. The system caches

问题 I have this formula in a function below. It's a fairly simple concept, yet this formula took me almost 2 weeks to get perfect. What it does is calculates what point to place an object at a given degree around and distance from a central point. It's useful for manually drawing circles, and also I primarily use it for a needle gauge component of mine. It calculates where to draw the needle. Now I'm trying to figure out how to modify this formula to take ovals or ellipses into account. I did

问题 Using the dot directed graph language, is it possible to create subgraphs with a different rankdir? I tried the following, which didn't work. Both graphs were left to right, despite the presence of rankdir="TB" in the subgraph. digraph g { rankdir="LR"; LEFT->RIGHT; clusterrank="local"; subgraph cluster1 { rankdir="TB"; node[style=filled]; color=black; TOP->BOTTOM; } } Is there some other syntax to get a Top/Bottom and Left/Right graph in the same diagram, or is this not possible? 回答1: Seems

问题 I need to create a rectangle object and then paint it to the applet using paint(). I tried Rectangle r = new Rectangle(arg,arg1,arg2,arg3); Then tried to paint it to the applet using g.draw(r); It didn't work. Is there a way to do this in java? I have scoured google to within an inch of its life for an answer, but I haven't been able to find an answer. Please help! 回答1: Try this: public void paint (Graphics g) { Rectangle r = new Rectangle(xPos,yPos,width,height); g.fillRect(r.getX(), r.getY(

问题 I have a couple of arcs and rects in a UIView , and a UIImageView as well. I want to have the UIImageView in the background. I have ordered it in IB so that the image view is behind my labels and buttons. First, I need to put an image in the image view, which I don't want to do in IB. I've tried this code UIImage *myImage = [UIImage imageNamed:@"image.png"]; UIImageView *myImageView = [[UIImageView alloc] initWithImage:@"myImage"]; But it doesn't work. After I get that working, what can I do