add example donut io

Author: mikebarkmin

docs/de/book/examples/donut-io.md

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+---
+name: Donut IO
+lang: de
+---
+
+# Donut IO
+
+Dieses Beispiel zeigt die Wechsel der Bühne und die Interaktion mehrerer Figuren miteinander.
+
+![donut io example](/assets/donut-io.gif)
+
+## Quelltext
+
+- Java: https://github.com/openpatch/scratch-for-java/tree/main/examples/java/DonutIO

docs/de/public/assets/donut-io.gif

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+---
+name: Donut IO
+lang: en
+---
+
+# Donut IO
+
+This example show the switch of stages and the interaction of multiple sprites.
+
+![donut io example](/assets/donut-io.gif)
+
+## Source Code
+
+- Java: https://github.com/openpatch/scratch-for-java/tree/main/examples/java/DonutIO

docs/en/book/examples/donut-io.md

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+import org.openpatch.scratch.Sprite;
+
+public class Background extends Sprite {
+
+  public Background() {
+    this.addCostume("grid", "assets/grid.png");
+  }
+
+  public void run() {
+    this.setX(-WorldStage.CAM.getX() % 20);
+    this.setY(-WorldStage.CAM.getY() % 20);
+  }
+
+}

docs/en/public/assets/donut-io.gif

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+import java.awt.geom.Ellipse2D;
+import org.openpatch.scratch.Sprite;
+import org.openpatch.scratch.extensions.math.Random;
+import org.openpatch.scratch.extensions.math.Vector2;
+
+public class Donut extends Sprite {
+
+  private int strength;
+  protected double speed = 1;
+  protected Vector2 mapPosition;
+
+  public Donut() {
+    this(0, 0, 2);
+  }
+
+  public Donut(double mapX, double mapY, int strength) {
+    this.addCostume("donut", "assets/donut.png");
+    this.setHitbox(new Ellipse2D.Double(0, 0, 512, 480));
+
+    this.setMapPosition(new Vector2(mapX, mapY));
+
+    this.setStrength(strength);
+
+    this.setTint(Random.randomInt(240), Random.randomInt(240), Random.randomInt(240));
+  }
+
+  public void setStrength(int strength) {
+    this.strength = strength;
+    this.setSize(strength);
+  }
+
+  public void setMapPosition(Vector2 position) {
+    this.mapPosition = position;
+    this.setPosition(this.mapPosition.sub(WorldStage.CAM));
+  }
+
+  public void run() {
+    this.setPosition(this.mapPosition.sub(WorldStage.CAM));
+
+    var touchingDonut = this.getTouchingSprite(Donut.class);
+    if (touchingDonut != null && this.strength >= touchingDonut.strength) {
+      this.setStrength(this.strength + touchingDonut.strength);
+      touchingDonut.remove();
+    }
+  }
+}

examples/java/DonutIO/Background.java

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+public class FollowDonut extends Donut {
+
+  private PlayerDonut player;
+
+  public FollowDonut(PlayerDonut player) {
+    this.player = player;
+  }
+
+  public void run() {
+    var v = player.mapPosition.sub(this.mapPosition).unitVector();
+
+    this.setMapPosition(this.mapPosition.add(v).multiply(this.speed));
+
+    super.run();
+  }
+}

examples/java/DonutIO/Donut.java

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+import org.openpatch.scratch.Window;
+
+public class Game extends Window {
+
+  public static int LEVEL = 0;
+
+  public Game() {
+    super(800, 600, "assets");
+
+    this.setStage(new StartStage());
+  }
+
+  public static void main(String[] args) {
+    new Game();
+  }
+}

examples/java/DonutIO/FollowDonut.java

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+import org.openpatch.scratch.KeyCode;
+import org.openpatch.scratch.Stage;
+import org.openpatch.scratch.Window;
+import org.openpatch.scratch.extensions.text.Text;
+
+public class GameOverStage extends Stage {
+  public GameOverStage() {
+
+    this.add(new Background());
+
+    var text = new Text();
+    text.setTextSize(48);
+    text.setTextColor(200, 100, 100);
+    text.showText("Level " + Game.LEVEL + " is too hard for you!");
+    text.setPosition(0, 0);
+    this.add(text);
+
+    text = new Text();
+    text.setTextSize(32);
+    text.setTextColor(200, 100, 100);
+    text.showText("Press Space to start again!");
+    text.setPosition(0, -40);
+    this.add(text);
+  }
+
+  public void whenKeyPressed(int keyCode) {
+    System.out.println(keyCode);
+    if (keyCode == KeyCode.VK_SPACE) {
+      Game.LEVEL = 0;
+      Window.getInstance().setStage(new WorldStage());
+    }
+  }
+}

examples/java/DonutIO/Game.java

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+public class PlayerDonut extends Donut {
+
+  public PlayerDonut() {
+    super(0, 0, 10);
+  }
+
+  public void run() {
+    var v = this.getMouse().unitVector();
+
+    this.setMapPosition(this.mapPosition.add(v).multiply(this.speed));
+
+    super.run();
+
+  }
+}