Mega Code Archive
Select a Curve To Display Its Points and Flatness Index
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import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.QuadCurve2D;
import java.awt.geom.Rectangle2D;
import java.util.Vector;
import javax.swing.JFrame;
public class QuadCurveControlPoint extends JFrame {
DrawingCanvas canvas = new DrawingCanvas();
public QuadCurveControlPoint() {
getContentPane().add(canvas);
setSize(500, 500);
setVisible(true);
}
public static void main(String arg[]) {
new QuadCurveControlPoint();
}
class DrawingCanvas extends Canvas {
Vector quadCurves = new Vector();
QuadCurve2D selectedCurve = null;
Rectangle2D boundingRec = null;
public DrawingCanvas() {
setSize(400, 200);
quadCurves.addElement(new QuadCurve2D.Float(20, 20, 80, 160, 120, 20));
quadCurves.addElement(new QuadCurve2D.Float(120, 100, 160, 40, 200, 180));
for (int i = 0; i < quadCurves.size(); i++) {
QuadCurve2D curve = (QuadCurve2D) quadCurves.elementAt(i);
selectedCurve = curve;
boundingRec = curve.getBounds2D();
System.out.println(selectedCurve.getX1());
System.out.println(selectedCurve.getY1());
System.out.println(selectedCurve.getCtrlX());
System.out.println(selectedCurve.getCtrlY());
System.out.println(selectedCurve.getX2());
System.out.println(selectedCurve.getY2());
double flatness = selectedCurve.getFlatness();
System.out.println(flatness);
}
}
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
for (int i = 0; i < quadCurves.size(); i++) {
g2D.draw((QuadCurve2D) quadCurves.elementAt(i));
}
if (boundingRec != null) {
drawHighlightSquares(g2D, boundingRec);
}
}
public void drawHighlightSquares(Graphics2D g2D, Rectangle2D r) {
double x = r.getX();
double y = r.getY();
double w = r.getWidth();
double h = r.getHeight();
g2D.setColor(Color.black);
g2D.fill(new Rectangle.Double(x - 3.0, y - 3.0, 6.0, 6.0));
g2D.fill(new Rectangle.Double(x + w * 0.5 - 3.0, y - 3.0, 6.0, 6.0));
}
}
}
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