Turtle is back

gdx2d-demoDesktop/src/ch/hevs/gdx2d/demos/simple/DemoTurtle.java

@@ -0,0 +1,96 @@
+package ch.hevs.gdx2d.demos.simple;
+
+import com.badlogic.gdx.graphics.Color;
+
+import ch.hevs.gdx2d.components.graphics.Turtle;
+import ch.hevs.gdx2d.desktop.PortableApplication;
+import ch.hevs.gdx2d.lib.GdxGraphics;
+
+/**
+ * A very simple demonstration on how to display something animated with the
+ * turtle paradigm
+ * 
+ * @author Pierre-André Mudry (mui)
+ * @version 1.0
+ */
+public class DemoTurtle extends PortableApplication {
+	Turtle t;
+
+	/**
+	 * Draws the snowflake
+	 * @param length Length of the side of the flake
+	 * @param level The complexity level of the recursion
+	 */
+	void drawFlake(double length, int level) {
+		drawSegment(length, level);
+		t.turn(120);
+		drawSegment(length, level);
+		t.turn(120);
+		drawSegment(length, level);
+		t.turn(120);
+	}
+
+	/**
+	 * Draws a side of the flake
+	 * @param length length of the segment
+	 * @param level complexity level for the recursion
+	 */
+	void drawSegment(double length, int level) {
+		//Recursion shall end somewhere
+		if (level == 0) {
+			t.forward(length);
+			return;
+		}
+
+		double currentLevel = length / 3.0;
+		drawSegment(currentLevel, level - 1);
+		t.turn(-60);
+		drawSegment(currentLevel, level - 1);
+		t.turn(120);
+		drawSegment(currentLevel, level - 1);
+		t.turn(-60);
+		drawSegment(currentLevel, level - 1);
+	}
+
+	@Override
+	public void onInit() {
+		setTitle("Moving turtle demo, mui 2016");
+	}
+
+	int flakeSize = 2, animDirection = 1;
+
+	@Override
+	public void onGraphicRender(GdxGraphics g) {
+		if (t == null)
+			t = new Turtle(g, g.getScreenWidth(), g.getScreenHeight());
+
+		// Clears the screen
+		g.clear(Color.DARK_GRAY);
+
+		// Go to the top of the screen
+		t.changeColor(Color.WHITE);
+
+		/**
+		 * Locate the turtle at the bottom of the screen
+		 */
+		t.penDown();
+		t.setAngle(60);
+		t.jump((float) (g.getScreenWidth() * 0.5), (float) (g.getScreenHeight() * 0.25));
+
+		// Displays the snowflake
+		drawFlake(20 + flakeSize * 2, 4);
+
+		// Animate size
+		flakeSize += animDirection;
+
+		if (flakeSize == 100 || flakeSize == 2)
+			animDirection *= -1;
+
+		g.drawFPS();
+		g.drawSchoolLogo();
+	}
+
+	public static void main(String[] args) {
+		new DemoTurtle();
+	}
+}