1 files changed, 128 insertions, 0 deletions
diff --git a/CSMath/src/bezier/BezierPanel.java b/CSMath/src/bezier/BezierPanel.java
new file mode 100644
index 0000000..86b4dd9
--- /dev/null
+++ b/CSMath/src/bezier/BezierPanel.java
@@ -0,0 +1,128 @@
+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.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);
+	}
+}
+\ No newline at end of file