![]() GradientPaint gradient = new GradientPaint ( Graphics2d.fillRect(0, 0, getWidth(), getHeight()) Here are the methods we can call on a Graphics2D object: Here are the methods we can call on a Graphics reference: Actually, a Graphics2D object can do more than a Graphics object. That's because there are things we can do with a Graphics2D reference that we can't do with a Graphics reference. However, we can cast it with a new Graphics2D variable: So, if we need to use a method from the Graphics2D class, we can' use the g in paintComponent(Graphics g) directly. ![]() ![]() Actually, the object referenced by g is an instance of the Graphics2D class. The argument for paintComponent() is a type Graphics which is from : We're telling it what color to paint with and then what shape to paint, where it goes, and how big it is. #JAVA 1.8 80 COLORPICKER PAINT ISSUES CODE#The following block of code Graphics method which is the key in this section. Here, we're making a subclass of JPanel which is a widget that we can add to a frame: G.fillRect(0, 0, getWidth(), getHeight()) įtDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) Overriding paintComponent() is arguably the most important concept to understand in writing custom Swing components. Standard Swing components already handle this functionality for their graphics, so it is only for the case of custom components with specialized rendering that this method must be overridden. This rendering may include drawing graphics inside a canvas, but it also include doing anything custom to a standard component, such as rendering a gradient for the background of a button. In the following code, we make a subclass of JPanel and override one method, paintComponent().Īpplications that have components with any custom rendering may need to override this method to perform that custom rendering. The repaint() call eventually leads to paintComponent() being called. However, we can ask the system to refresh the display by calling repaint(). It is the actual drawing canvas that will be displayed. The system calls it.Ī Graphics object is the argument to this method. ![]() When we want to draw our own graphics on the screen, we should put our graphics code inside the paintComponent() method. Java Graphics Interface III - paintComponent ![]()
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