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Asked: 2026-06-05T00:00:51+00:00

//I am trying to create a basic race car in java. I made a

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//I am trying to create a basic race car in java. I made a rectangle for the body and now I am trying to make a triangle for the front. I looked online for code on creating a triangle but none of it looks like it is in the format as I have for the rectangle I have below. I got most of this code from “Video Game Programming for the Evil Genius” as a reference and now we are encouraged to create our own vehicle, but rectangles are the only shapes explained. I did copy the code from the rectangle to triangle expecting one to overlap the other, just so that I knew it worked, but it’s not. Would anyone be able to explain to me how to make a triangle and possibly a circle? Also is there anyway of doing this without having to create another class?

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public class Vehicle extends JFrame

 {
    final int WIDTH = 900; int HEIGHT = 650;

    Rectangle p1Body = new Rectangle(WIDTH/9,HEIGHT/2, WIDTH/30,WIDTH/30);
    Triangle p1Front = new Triangle(WIDTH/9,HEIGHT/2, WIDTH/30,WIDTH/30);

    Rectangle p2Body = new Rectangle(((WIDTH/9)+((int)((WIDTH/9)*1.5)/2)),(HEIGHT/2)+ 
    (HEIGHT/10),WIDTH/30,WIDTH/30);


public Vehicle()
    {
        super("Radical Racing");
        setSize(WIDTH,HEIGHT);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);

}
public void paint(Graphics g)
{
    super.paint(g);

    g.setColor(Color.DARK_GRAY);
    g.fillRect(0,0,WIDTH,HEIGHT);

    g.setColor(Color.BLUE);

    g.fill3DRect(p1Body.x,p1Body.y,p1Body.width,p1Body.height,true);
    g.setColor(Color.BLUE);
    g.fill3D(p1Front.x,p1Front.y,p1Front.width,p1Front.height,true);


    g.setColor(Color.red);

    g.fill3DRect(p2Body.x,p2Body.y,p2Body.width,p2Body.height,true);

}


public static void main(String[]args)
    {
        new Vehicle();
    }

}
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1 Answer

  1. Editorial Team

    Triangle can be done using Path2D(.Double) circle can be done using Ellipse2D(.Double)

    BTW, you might want to think about combining all of these shapes into one using Area – http://docs.oracle.com/javase/7/docs/api/java/awt/geom/Area.html. Area is very useful for manipulating shapes & testing if they contain a point etc.

    Check out Graphics2D.draw (or fill) (Shape)

    http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics2D.html#draw(java.awt.Shape)

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