Started Building Animals Recipe w/Jim

Author: lynnlangit

src/org/teachingextensions/logo/MultiTurtlePanel.java

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+package org.teachingextensions.logo;
+
+import java.awt.BasicStroke;
+import java.awt.Cursor;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.RenderingHints;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Line2D;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.swing.ImageIcon;
+import javax.swing.JFrame;
+
+import org.teachingextensions.logo.Turtle.Animals;
+import org.teachingextensions.windows.ProgramWindow;
+
+public class MultiTurtlePanel extends ProgramWindow
+{
+  private List<Turtle> turtles;
+  private Image        image;
+  private Animals      animal;
+  public MultiTurtlePanel()
+  {
+    turtles = new ArrayList<Turtle>();
+  }
+  public void addTurtle(Turtle turtle)
+  {
+    this.turtles.add(turtle);
+  }
+  @Override
+  public void paint(Graphics g)
+  {
+    super.paint(g);
+    paintLines((Graphics2D) g);
+    paintTurtle((Graphics2D) g);
+  }
+  private void paintLines(Graphics2D g)
+  {
+    for (Turtle turtle : turtles)
+    {
+      if (turtle == null) { return; }
+      g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+      g.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
+      g.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
+      g.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
+      for (LineSegment l : turtle.getTrail())
+      {
+        if (l != null)
+        {
+          g.setColor(l.getColor());
+          g.setStroke(new BasicStroke(l.getWidth(), BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER));
+          g.draw(new Line2D.Double(l.getStart().x, l.getStart().y, l.getEnd().x, l.getEnd().y));
+        }
+      }
+    }
+  }
+  private void paintTurtle(Graphics2D g)
+  {
+    for (Turtle turtle : turtles)
+    {
+      if (turtle == null || turtle.isHidden()) { return; }
+      Image image = getImage();
+      int xCenter = image.getWidth(null) / 2;
+      int yCenter = image.getHeight(null) / 2;
+      int x = turtle.getX() - xCenter;
+      int y = turtle.getY() - yCenter;
+      AffineTransform rotate = AffineTransform.getRotateInstance(Math.toRadians(turtle.getHeadingInDegrees()),
+          xCenter, yCenter);
+      AffineTransform move = AffineTransform.getTranslateInstance(x, y);
+      move.concatenate(rotate);
+      g.drawImage(image, move, null);
+    }
+  }
+  public synchronized Image getImage()
+  {
+    if (image == null)
+    {
+      setAnimal(Animals.Turtle);
+    }
+    return image;
+  }
+  public synchronized Animals getAnimal()
+  {
+    if (animal == null)
+    {
+      setAnimal(Animals.Turtle);
+    }
+    return animal;
+  }
+  public synchronized void setAnimal(Animals animal)
+  {
+    this.animal = animal;
+    image = new ImageIcon(this.getClass().getResource(animal + ".png")).getImage();
+  }
+  public void setCursor(int cursor)
+  {
+    this.setCursor(Cursor.getPredefinedCursor(cursor));
+  }
+  public void showPanel()
+  {
+    JFrame frame = new JFrame("Animals");
+    frame.getContentPane().add(this);
+    ProgramWindow.createStandardFrame(frame);
+    this.repaint();
+  }
+  public void ___()
+  {
+    // blank for the DeepDive
+  }
+}

src/org/teachingkidsprogramming/section07events/ManyAnimals.java

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+package org.teachingkidsprogramming.section07events;
+
+import org.teachingextensions.logo.MultiTurtlePanel;
+import org.teachingextensions.logo.Turtle;
+import org.teachingextensions.windows.MouseLeftClickListener;
+
+public class ManyAnimals implements MouseLeftClickListener
+{
+  public ManyAnimals()
+  {
+    showSomeTurtles();
+  }
+  private void showSomeTurtles()
+  {
+    MultiTurtlePanel mt = new MultiTurtlePanel();
+    Turtle t1 = new Turtle();
+    mt.addTurtle(t1);
+    t1.setX(100);
+    t1.setY(300);
+    Turtle t2 = new Turtle();
+    mt.addTurtle(t2);
+    t1.setX(300);
+    t1.setY(100);
+    mt.showPanel();
+  }
+  @Override
+  public void onLeftMouseClick(int x, int y)
+  {
+    // createTurtles (recipe below) --#8
+    //------------- Recipe for createTurtles --#8
+    // Remove previous Tortoise from your program window --#9
+    // programWindow.removePaintable();
+    // Set the count of Turtles to a random number between 10 and 50 --#2.5
+    // Create a tortoise at 200, 300 --#2.1
+    // Add the circle to your program window --#2.4
+    //------------- End of createTurtles recipe --#8
+  }
+  public static void main(String[] args)
+  {
+    new ManyAnimals();
+  }
+}