Simple Draw an arc problem

Discussion in 'iOS Programming' started by oceandrive, Dec 19, 2008.

  1. macrumors newbie

    Nov 17, 2008

    Created an view based application in the Xcode and created a new View called chartView:UIView and mapped the controller using the IB .

    I wanted to draw a simple arc on my ChartView . So inside my drawRect method I put the code for the arc.

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
    CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);
    CGContextSetLineWidth(context, 2.0);
    int x = 150;
    int y= 100;
    int r= 80;
    CGContextSetRGBFillColor(context, 0, 1, 0, 1);
    CGContextMoveToPoint(context, x, y);
    CGContextAddArc(context,x , y, r, 0.0*M_PI/180.0, 90.0*M_PI/180.0, 0);

    I see an empty screen when I start my application.

    Can someone tell me if I am missing any step. Thanks For the help.
  2. Moderator emeritus


    Jun 15, 2000
    Start off with something basic, like filling a rect. If that works, go from there and try a basic arc. Also use positions relative to the view, using things like CGRectGetMinX instead of 0
  3. thread starter macrumors newbie

    Nov 17, 2008
    I started of with the QuartzDemo example and was able to draw the arc (in fact the complete pie chart) successfully. But once I strarted to draw the arc on the project which I created I am having the problem. Nothing shows on the screen.

    But when I drag and drop a text field or a label using the interface builder, I can see them on the simulator.

    Thanks for the help.
  4. thread starter macrumors newbie

    Nov 17, 2008
    issues fixed. had to delete an extra view on my Mainview.

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