Data update

Task/Simple-turtle-graphics/Java/simple-turtle-graphics.java

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+/* Class Turtle starts here */
+
+import java.awt.geom.AffineTransform;
+
+public class Turtle extends java.lang.Object
+{
+	private final java.awt.Graphics2D origin;
+	private java.awt.Graphics2D g2;
+
+	public Turtle(java.awt.Graphics2D origin)
+	{
+		this.origin = origin;
+		origin();
+	}
+	public void origin()
+	{
+		g2=(java.awt.Graphics2D)origin.create();
+	}
+	public void relativePosition(int xoff, int yoff)
+	{
+		AffineTransform at=g2.getTransform();
+		at.concatenate(AffineTransform.
+                       getTranslateInstance(xoff,yoff));
+		g2.setTransform(at);
+	}
+	public void turnByDegrees(int thetaInDegrees)
+	{
+		AffineTransform at=g2.getTransform();
+		at.concatenate(AffineTransform.
+                       getRotateInstance(Math.toRadians(thetaInDegrees)));
+		g2.setTransform(at);
+	}
+	public void forward(int len)
+	{
+		g2.drawLine(0,0,len,0);
+		relativePosition(len,0);
+	}
+}
+
+/* Class CanvasComponent starts here*/
+
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+
+public class CanvasComponent extends javax.swing.JComponent
+{
+    protected void paintComponent(Graphics g)
+    {
+        Turtle turtle=new Turtle((Graphics2D)g);
+
+        turtle.origin();
+
+        turtle.relativePosition(50,50);
+
+        house(turtle,100,200,50);
+
+        turtle.origin();
+
+        turtle.relativePosition(200,50);
+
+        double[] numbers=new double[]{0.5, 0.33333, 2, 1.3, 0.5};
+
+        barchart(turtle,200,numbers);
+    }
+    private void barchart(Turtle turtle,int size,double[] numbers)
+    {
+        double max=0;
+        for(double d:numbers)
+        {
+            if(d>max)
+                max=d;
+        }
+        double width=size/ numbers.length;
+        int xpos=400;
+        for(double d:numbers)
+        {
+            int h=(int) (size * (d / max));
+            rectangle(turtle, (int)width, h);
+            xpos+=width;
+            turtle.relativePosition((int)width,0);
+        }
+    }
+    private void house(Turtle turtle,int width,
+                       int height, int roofheight)
+    {
+        rectangle(turtle,width,height);
+        turtle.relativePosition(0,height);
+        double dist= Math.sqrt(roofheight*roofheight+width/2*width/2);
+        double angle= Math.toDegrees(Math.asin(roofheight/dist));
+        turtle.turnByDegrees((int)angle);
+        turtle.forward((int)dist);
+        turtle.turnByDegrees(-2*(int)angle);
+        turtle.forward((int)dist);
+    }
+    private void rectangle(Turtle turtle,int width, int height)
+    {
+        for(int i=0;i<2;++i)
+        {
+            turtle.forward(width);
+            turtle.turnByDegrees(90);
+            turtle.forward(height);
+            turtle.turnByDegrees(90);
+        }
+
+    }
+}
+
+/* Class MainClass starts here */
+
+import javax.swing.*;
+import java.awt.*;
+
+public class MainClass
+{
+    public static void main(String[] args)
+    {
+        CanvasComponent canvas=new CanvasComponent();
+        canvas.setPreferredSize(new Dimension(800,600));
+        JFrame f=new JFrame();
+        JPanel p=new JPanel(new BorderLayout());
+        p.add(canvas);
+        f.setContentPane(p);
+        f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
+        f.pack();
+        f.setVisible(true);
+    }
+}