With this tutorial we shall show you how to draw simple shapes in a Java Desktop Application. This is a very important step when designing your own graphics for your App
Basically, all you have to do in order to draw shapes in a Java application is:
- Create a new
Frame. - Create a class tha extends
Componentclass and override thepaintmethod. - Use
Graphics2D.drawOvalto draw an oval shape in the screen
Let’s see the code snippet that follows:
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | package com.javacodegeeks.snippets.desktop;import java.awt.Component;import java.awt.Frame;import java.awt.Graphics;import java.awt.Graphics2D;public class DrawingComponentsExample { public static void main(String[] args) {// Create a frameFrame frame = new Frame();// Add a component with a custom paint methodframe.add(new CustomPaintComponent());// Display the frameint frameWidth = 300;int frameHeight = 300;frame.setSize(frameWidth, frameHeight);frame.setVisible(true); } /** * To draw on the screen, it is first necessary to subclass a Component * and override its paint() method. The paint() method is automatically called * by the windowing system whenever component's area needs to be repainted. */ static class CustomPaintComponent extends Component {public void paint(Graphics g) { // Retrieve the graphics context; this object is used to paint shapes Graphics2D g2d = (Graphics2D)g; // Draw an oval that fills the window int x = 0; int y = 0; int width = getSize().width-1; int height = getSize().height-1; /** * The coordinate system of a graphics context is such that the origin is at the * northwest corner and x-axis increases toward the right while the y-axis increases * toward the bottom. */ g2d.drawOval(x, y, width, height);} }} |
This was an example on how to draw components.
