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javagraphicscoordinate-systems

Drawing Arc in Java

I need to draw a Pie Arc in Java with start angle 350 and end angle 20.The cordinate system I follow is as follows:-

        |0  
        |
270-----------90 
        |
        |180

The problem here is that the start angle is greater than the end angle.For the other way round I have managed to draw the arc.Any help would be great.

Solution

  • You will have a start angle and an 'extent' angle and not an end angle. So, I don't think you would be having problem drawing an arc. 

    import java.awt.Graphics;
import javax.swing.JFrame;

public class Test extends JFrame{
    public static void main(String[] args){
        new Test();
    }
    public Test(){
        this.setSize(400,400);
        this.setVisible(true);
    }
    public void paint(Graphics g) {
        g.fillArc(100, 100, 100, 100, 70, 30);
    }
}

    enter image description here

    Alternatively, you can use the Arc2D class as well. One more thing to note that in java, this is the default co-ordinate mechanism.

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        |
180-----------0 
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        |270