CODEWITHSUNDEEP
javaswingjava-2d
user2112303
user2112303

Reputation: 51

Rectangle keeps going off panel(Screen)

Can anybody tell me how I can stop the rectangles from going off the panel (screen) in my game? The rectangles move side by side with keystrokes.

Upvotes: 2

Views: 950

Answers (2)

camickr
camickr

Reputation: 324118

Don't use a KeyListener. Swing was designed to be used with Key Bindings.

See Motion With the Keyboard for working examples. The examples will also do boundary checking to make sure the component is contained within its parents bounds.

Upvotes: 2

An SO User
An SO User

Reputation: 24998

Here is what you should do :
1. Keep a track of (x,y) coordinates of your rectangles.
2. Ensure that x + width of your rectangle is not greater than width of the JPanel for checking the collision with right edge
3. Ensure that x is not less than 0 to check the collision left edge.
4. Ensure that y + height is not greater than height of the JPanelto check the collision with bottom edge

Can you guess what it will be for the top edge ?

Upvotes: 2

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