QuadCurveControlPoint.java Source code

Introduction

Here is the source code for QuadCurveControlPoint.java

Source

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));

        }
    }
}