https://github.com/dlegland/javageom

Geometry library for Java
https://github.com/dlegland/javageom

Last synced: about 13 hours ago
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Geometry library for Java

• Host: GitHub
• URL: https://github.com/dlegland/javageom
• Owner: dlegland
• License: lgpl-3.0
• Created: 2015-07-30T11:17:23.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2020-11-12T16:49:32.000Z (about 4 years ago)
• Last Synced: 2023-02-28T09:02:07.003Z (over 1 year ago)
• Language: Java
• Size: 2.3 MB
• Stars: 48
• Watchers: 8
• Forks: 16
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • Changelog: changes.txt
  • License: LICENSE.txt

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README

        
# javaGeom

JavaGeom is a geometry library for Java. 

It provides a general framework for creating, manipulating, and combining geometric primitives. Among the features:

* computation of intersection points between shapes

* composition create new shapes, 

* measures on shapes (area, perimeter...)

The project was formerly hosted on SourceForge, but is now hosted on GitHub: https://github.com/dlegland/javaGeom.

Some examples of use are in the "demo" directory.

## Sample application

Here is the content of the "JavaGeomDemo" application, that can be found in the demo directory:

    import java.awt.Graphics;

    import java.awt.Graphics2D;

    import java.util.Collection;

      

    import javax.swing.JFrame;

    import javax.swing.JPanel;

    

    import math.geom2d.AffineTransform2D;

    import math.geom2d.Box2D;

    import math.geom2d.Point2D;

    import math.geom2d.conic.Circle2D;

    import math.geom2d.line.LineSegment2D;

    import math.geom2d.line.StraightLine2D;

    

    public class JavaGeomDemo extends JPanel{

    	

      public JavaGeomDemo() {}

  	

      public void paintComponent(Graphics g){

          Graphics2D g2 = (Graphics2D) g;

  

          // Create some points

          Point2D p1 = new Point2D(40, 30);

          Point2D p2 = new Point2D(180, 100);

  				

          // Draw the two points, using a radius of 2 pixels.

          p1.draw(g2, 2);

          p2.draw(g2, 2);

		  

          // Create and draw a circle

          Circle2D circle1 = new Circle2D(80, 120, 40);

          circle1.draw(g2);

		

          // Create a line

          StraightLine2D line1 = new StraightLine2D(p1, p2);

  		

          // Draw the line, after clipping

          Box2D box = new Box2D(0, 200, 0, 200);

          line1.clip(box).draw(g2);

	  	

          Point2D p3 = new Point2D(20, 120);

          Point2D p4 = new Point2D(40, 140);

		  

          // Create line segment

          LineSegment2D  edge  = new LineSegment2D(p3, p4);

          edge.draw(g2);

  		

          // Compute a median line, and draw it

          StraightLine2D line2 = StraightLine2D.createMedian(p3, p4);

          p4.draw(g2, 2);

          p4.draw(g2, 2);

          line2.clip(box).draw(g2);

  

          // Compute intersection between 2 lines

          Point2D intLine = line2.intersection(line1);

          intLine.draw(g2, 2);

      

          // Compute intersections between a circle and lines

          Collection intersects = circle1.intersections(line2);

          for(Point2D point : intersects)

              point.draw(g2, 2);

      

          // Create some affine transforms

          AffineTransform2D sca = AffineTransform2D.createScaling(p4, 2, .8);

          AffineTransform2D tra = AffineTransform2D.createTranslation(30, 40);

          AffineTransform2D rot = AffineTransform2D.createRotation(p4, Math.PI/2);

      

          // Display the transformed shapes.

          circle1.transform(sca).draw(g2);

          circle1.transform(tra).draw(g2);

          line2.transform(rot).clip(box).draw(g2);

      }

  

      public final static void main(String[] args){

          JPanel panel = new JavaGeomDemo();

          JFrame frame = new JFrame("JavaGeom Demo");

          frame.setContentPane(panel);

          frame.setSize(250, 250);

          frame.setVisible(true);

      }

    }