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package bezier;
import java.awt.Color;
import java.awt.Graphics;
import java.util.Collection;
import java.util.LinkedList;
import javax.swing.BorderFactory;
import javax.swing.JPanel;
import javax.swing.border.BevelBorder;
import bezier.geom.Bezier;
import bezier.geom.TDHPoint;
import bezier.geom.TDPoint;
import bezier.transforms.TDHCombination;
import bezier.transforms.TDHTransform;
import bezier.transforms.TDHTranslate;
import bezier.transforms.TDHXAxisReflection;
/*
* Panel that graphs a set of bezier curves.
*/
public class BezierPanel extends JPanel {
public final Collection<Bezier> curves;
private static final long serialVersionUID = 8748298173487657108L;
public BezierPanel() {
super();
curves = new LinkedList<>();
setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
}
public BezierPanel(Collection<Bezier> curvs) {
super();
curves = curvs;
setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
int ourWidth = getWidth();
int ourHeight = getHeight();
int halfWidth = ourWidth / 2;
int halfHeight = ourHeight / 2;
g.setColor(Color.WHITE);
/*
* Draw background
*/
g.fillRect(0, 0, ourWidth, ourHeight);
g.setColor(Color.BLUE);
/*
* Draw coordinate grid.
*/
g.drawLine(halfWidth, 0, halfWidth, ourHeight);
g.drawLine(0, halfHeight, ourWidth, halfHeight);
/*
* Transform to place points at center of grid w/ right orientation.
*/
TDHTransform translate = new TDHCombination(new TDHXAxisReflection(), new TDHTranslate(halfWidth, halfHeight));
for (Bezier curve : curves) {
/*
* Skip curves with no points.
*/
if (curve.controls.isEmpty()) {
continue;
}
{
/*
* Draw curve bounding box.
*/
g.setColor(curve.data.boxColor);
TDPoint[] ex = curve.extrema(translate);
g.drawLine((int) ex[0].x, (int) ex[0].y, (int) ex[1].x, (int) ex[1].y);
g.drawLine((int) ex[1].x, (int) ex[1].y, (int) ex[2].x, (int) ex[2].y);
g.drawLine((int) ex[2].x, (int) ex[2].y, (int) ex[3].x, (int) ex[3].y);
g.drawLine((int) ex[3].x, (int) ex[3].y, (int) ex[0].x, (int) ex[0].y);
}
g.setColor(curve.data.pointColor);
for (TDPoint control : curve.controls) {
/*
* Draw curve points.
*/
TDHPoint translatedPoint = translate.transform(control.multiply(curve.data.scale).toTDHPoint());
control = translatedPoint.toTDPoint();
drawCircle(g, control.x, control.y, 6);
}
g.setColor(curve.data.curveColor);
for (int i = 0; i < curve.data.parts; i++) {
/*
* Draw curve itself.
*/
double dT = 1.0 / curve.data.parts;
TDPoint firt = curve.scaleEval(dT * i);
TDPoint secod = curve.scaleEval(dT * (i + 1));
TDPoint first = translate.transform(firt.toTDHPoint()).toTDPoint();
TDPoint second = translate.transform(secod.toTDHPoint()).toTDPoint();
g.drawLine((int) first.x, (int) first.y, (int) second.x, (int) second.y);
}
}
}
/*
* Draw a circle of a given diameter at a point.
*/
private static void drawCircle(Graphics g, double x, double y, int diameter) {
g.fillOval((int) x - diameter / 2, (int) y - diameter / 2, diameter, diameter);
}
}
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