From: Bill Kuker <bkuker@billkuker.com>
Date: Wed, 15 Apr 2009 13:07:26 +0000 (+0000)
Subject: (no commit message)
X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=cc98e37214bd225e68f840389401a4d3d52bb2a9;p=sw%2Fmotorsim

---

diff --git a/src/TriTest.java b/src/TriTest.java
new file mode 100644
index 0000000..03875b7
--- /dev/null
+++ b/src/TriTest.java
@@ -0,0 +1,135 @@
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Shape;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Area;
+import java.awt.geom.Ellipse2D;
+import java.awt.geom.GeneralPath;
+import java.awt.geom.PathIterator;
+import java.awt.geom.Rectangle2D;
+
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.JSlider;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+
+
+public class TriTest extends JPanel {
+	
+	double r = 0;
+	@Override
+	public void paint(Graphics gg){
+		Graphics2D g = (Graphics2D)gg;
+		
+		g.clearRect(0, 0, 600, 600);
+		GeneralPath p;
+		
+		p = new GeneralPath();
+		p.moveTo(100,100);
+		p.lineTo(200, 150);
+		p.lineTo(150, 180);
+		p.lineTo(100, 300);
+		p.closePath();
+		g.setColor(Color.red);
+		g.draw(growArea(p, r));
+		g.setColor(Color.black);		
+		g.draw(p);
+		
+		
+		p = new GeneralPath();
+		p.moveTo(10,10);
+		p.lineTo(50, 20);
+		p.lineTo(60, 30);
+		p.closePath();
+		g.setColor(Color.red);
+		g.draw(growArea(p, 10));
+		g.setColor(Color.black);		
+		g.draw(p);
+		
+	}
+	
+	private Area growArea( Shape a, double sz ){
+		Area ret = new Area();
+		
+		PathIterator i = a.getPathIterator(new AffineTransform(), .001);
+		double last[] = {0,0};
+		double first[] = {0,0};
+		while (!i.isDone()) {
+			double coords[] = new double[6];
+			int type = i.currentSegment(coords);
+			switch (type){
+				case PathIterator.SEG_MOVETO:
+					first[0] = last[0] = coords[0];
+					first[1] = last[1] = coords[1];
+					break;
+				case PathIterator.SEG_CLOSE:
+					coords[0] = first[0];
+					coords[1] = first[1];
+				case PathIterator.SEG_LINETO:
+					//Do it;
+					double len = Math.sqrt(Math.pow(last[0] - coords[0], 2) + Math.pow(last[1] - coords[1], 2));
+					double dx = coords[0]-last[0];
+					double dy = coords[1]-last[1];
+					double angle = Math.atan2(dy, dx);
+							
+					Area rect;
+					if ( sz > 0 )
+						rect = new Area(new Rectangle2D.Double(0,-sz,len,sz));
+					else
+						rect = new Area(new Rectangle2D.Double(0,0,len,-sz));
+					rect.transform(AffineTransform.getRotateInstance(angle));
+					rect.transform(AffineTransform.getTranslateInstance(last[0], last[1]));
+					ret.add(rect);
+					
+					if ( sz > 0 ){
+						ret.add(new Area(new Ellipse2D.Double(coords[0]-sz, coords[1]-sz, sz*2, sz*2)));
+					} else {
+						ret.add(new Area(new Ellipse2D.Double(coords[0]+sz, coords[1]+sz, -sz*2, -sz*2)));
+					}
+					
+					
+					last[0] = coords[0];
+					last[1] = coords[1];
+					break;
+				case PathIterator.SEG_CUBICTO:
+				case PathIterator.SEG_QUADTO:
+					throw new Error("Unflattend Geometry!");
+			}
+			i.next();
+		}
+		
+		if ( sz > 0 )
+			ret.add(new Area(a));
+		else
+			ret.intersect(new Area(a));
+		return ret;
+	}
+	
+	public static void main( String args[] ){
+		JFrame f = new JFrame();
+		f.setDefaultCloseOperation(f.DISPOSE_ON_CLOSE);
+		final TriTest t = new TriTest();
+		f.getContentPane().setLayout(new BorderLayout());
+		f.getContentPane().add(t, BorderLayout.CENTER);
+		f.getContentPane().add(new JSlider(){{
+				setMinimum(-100);
+				setMaximum(100);
+				addChangeListener(new ChangeListener(){
+					{ setValue(0); }
+					@Override
+					public void stateChanged(ChangeEvent arg0) {
+						t.r = getValue();
+						t.repaint();
+					}
+				});
+			}}, BorderLayout.SOUTH);
+
+		f.setSize(400,400);
+		f.setLocation(600,600);
+		f.show();
+		
+	}
+}