Drawing Rectangles in Java awt

Question

I am interested in drawing a Rectangle object using AWT methods (I know, it's old). I have looked at other code on the forum that has answers, but they are not working for me. Here is what I am looking to do...

paint(Graphics g) {
    Rectangle r = new Rectangle(5,5,20,20);
    g.drawRect(r.getX(),r.getY(),r.getWidth(),r.getHeight());
}

But what I have to do is:

g.drawRect((int)r.getX().........);

and cast every value to an int. Am I doing something wrong? The code examples that I found have the solution without the casting. If I don't cast, I get an error. Surely, there should be something more simple.

Thanks in advance.

Based on the documentation, Rectangle constructors accepts int values. https://docs.oracle.com/javase/7/docs/api/java/awt/Rectangle.html — Nasser Tahani, Apr 03 '18 at 13:56
Yes. The constructor accepts int values, but the get functions return doubles. drawRect accepts ints. — Nick, Apr 03 '18 at 14:09

score 0 · Answer 1 · answered Apr 03 '18 at 13:58

0

From javadoc here we can see that those methods return a double value, and the method drawRect in Graphics uses integers as parameters, as documented here, so you have to cast the double to an integer.

answered Apr 03 '18 at 13:58

Coreggon

505
2
5
17

I understand that. Here, the answer was upvoted 14 times, but is incorrect, then? https://stackoverflow.com/questions/11745595/how-to-create-a-rectangle-object-in-java-using-g-fillrect-method – Nick Apr 03 '18 at 14:10
@Nick That's indeed odd. I added a comment there. Let's see how this sorts itself out. – Marco13 Apr 03 '18 at 21:31

Nasser Tahani · Answer 2 · 2018-04-04T05:28:06.237

0

You can cast Graphics to Graphics2D to use its draw() method to draw 'java.awt.shap' objects like this:

paint(Graphics g) {
   Grahpics2D g2 = (Graphics2D) g;
   Shape s = new Rectangle(5,5,20,20);
   g2.draw(s);
}

edited Apr 04 '18 at 05:28

answered Apr 03 '18 at 14:20

Nasser Tahani

725
12
33

1

java.awt.Component doesn’t have a `paint(Graphics2D)` method, so writing a method with that signature will be meaningless. Perhaps you meant to recommend casting the Graphics object given to `paint(Graphics)` to a Graphics2D object? – VGR Apr 03 '18 at 15:05

score 0 · Answer 3 · answered Apr 03 '18 at 21:10

0

This is an easy way to do it. I figured it out:

paint(Graphics g) {
    Rectangle r = new Rectangle(5,5,30,30);
    g.drawRect(r.x,r.y,r.width,r.height);
}

answered Apr 03 '18 at 21:10

Nick

25
8

Assuming that this is "pseudocode". You would not need to create the `Rectangle` object just to call the `drawRect` method. But broadly speaking, casting the `Graphics` to `Graphics2D` gives you many nice new options, including the option to just to `graphics2D.draw(new Rectangle(...))` and much more. – Marco13 Apr 03 '18 at 21:33

Drawing Rectangles in Java awt

3 Answers3