Purple Turtle!

lec40_git/Purple_Turtle.java

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+import java.awt.*;
+import java.awt.geom.Line2D;
+
+/**
+ * A simple "Turtle Graphics" style tool for students.
+ */
+public class Turtle {
+    private Graphics2D g2d;
+    private double x = 0;
+    private double y = 0;
+    private double heading = 0; // Degrees, 0 is East
+
+    public Turtle(Graphics2D g2d) {
+        this.g2d = g2d;
+        // Set default stroke
+        g2d.setStroke(new BasicStroke(3));
+    }
+
+    public void setColor(Color c) {
+        g2d.setColor(Color.MAGENTA);
+    }
+
+    public void forward(double pixels) {
+        double rad = Math.toRadians(heading);
+        double newX = x + Math.cos(rad) * pixels;
+        double newY = y + Math.sin(rad) * pixels;
+
+        g2d.draw(new Line2D.Double(x, y, newX, newY));
+
+        x = newX;
+        y = newY;
+    }
+
+    public void turnRight(double degrees) {
+        heading += degrees;
+    }
+
+    public void turnLeft(double degrees) {
+        heading -= degrees;
+    }
+}