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Thread: Coloring The Nested Ellipses/Circles

  1. #1
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    Default Coloring The Nested Ellipses/Circles

    Hey all,

    I am learning Java Swing for 2 days and trying to do some simple codes for better learning.

    I have three(can be more) nested elllipse. I want to fill the gaps between the ellipses with different colors. However, have little coordinate problem. That piece of code can properly draws 3 circles (or whatever number you want). I just want to fill the gaps between those nested circles with different colors. How to use fill method and how to give it correct coordinate parameters to do that job?
    Thanks in advance.

    	protected void paintComponent(Graphics g) {
    		super.paintComponent(g);
    		Graphics2D obj = (Graphics2D)g;
    		obj.setRenderingHint(
    				RenderingHints.KEY_ANTIALIASING,
    				RenderingHints.VALUE_ANTIALIAS_ON);
     
    		int maxRadius = Math.min(getWidth(), getHeight());
    		//int alpha = 255;
    		//int range = 255 - 32; ignore those lines.
     
    		obj.setStroke(new BasicStroke(0, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
     
    		for(int i = 1; i< 4; i++){ // That code draws nested 3 circles.
     
    			float progress = (float) i / (float)4; //  it increases the radiance of the ellipses step by step.
    			//alpha = 255 - Math.round(range * progress);
    			//Color color = new Color(0, 0, 0, alpha);
     
     
    			int radius = Math.round(maxRadius * progress);
     
     
    			int x = (getWidth() - radius) / 2;
    			int y = (getHeight() - radius) / 2;
    			obj.setColor(Color.BLACK);	
    			obj.draw(new Ellipse2D.Float(x, y , radius, radius));
    			//obj.fill(new Ellipse2D.Float(x, y, radius,radius ));
     
     
    		}
     
    		obj.dispose();
    	}


  2. #2
    Senior Member PhHein's Avatar
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    Default Re: Coloring The Nested Ellipses/Circles

    Use obj.fill, as you've commented out and draw the largest circle first. Set a different color for each circle.

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