![]() Initial Code Template /* Drawing Program that allows you to draw some shapes */ package drawingcanvas /** * * Binkster * version 1 */ import java.awt.* import javax.swing. Null object patterns deal with null objects. In fact, when we call this class, we will also pass it our own created class with its Canvas extension so the program will know to use the JFrame window to draw the shapes. The null object design pattern describes the uses of null objects and their behavior in the system. The Graphics class contains many of the drawing functions to draw basic shapes like circles, lines, and squares (rectangles).įinally, there is the JFrame class that allows the programmer to create a window where the drawings will be rendered. We happily present you a simple hack and tweak to re-size according. The Graphics class can be added to any program using the import statement, ‘import java.awt.*”. You may be wondering, how to play those java games which are either very big or small for your mobile phone’s screen resolution. Next, there is the Graphics class that we will need to help draw our shapes. This function is where we will do all of our drawings prior to passing the shapes to the JFrame function. How to make Round JButtons Making a Frame Non Resizable in Java How to create a simple alert message in java Getting X and Y coordinates of JFrame. ![]() As stated above, this will allow us to have access to the “paint” function (in which we will override). Rectangles are displayed but nothing happens when the mouse is over. ![]() Plus, I wanted to touch on the Canvas extension I will be using to have access to the “paint” function.įirst, we will tell our program to extend the Canvas class. That the cursor change when the mouse is over one of the rectangles. A Little Info about the Graphics, Canvas, and JFrame Classes.īefore I show you the initial code, I wanted to explain the two main classes we will be using to create our shapes.
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