GraphicsfillRectint

GraphicsfillRectint refers to the Java AWT and Swing method Graphics.fillRect(int x, int y, int width, int height). It is the operation that fills the interior of a rectangle with the current drawing color. The name as written is a concatenation of the class name, method, and parameter types, but in code it is invoked as Graphics.fillRect(x, y, width, height).

Parameters and behavior: The parameters specify the rectangle’s top-left corner (x, y) and its size (width, height). The method returns void. The fill uses the current color set on the Graphics context, which can be changed with setColor(Color). The filled area is subject to the current clip region; parts outside the clip are not drawn. If width or height is zero or negative, the call has no effect. The rectangle is axis-aligned and not rotated by this operation.

Usage context: This method is commonly used in custom painting code, such as overriding a component’s paintComponent(Graphics g) method in Swing. After preparing the Graphics context (often casting to Graphics2D for advanced features), a programmer can fill backgrounds, UI elements, or shapes by issuing fillRect calls with appropriate coordinates and sizes. It is typically paired with drawing outlines of rectangles via drawRect or with other fill methods for more complex shapes.

Related concepts: Other related methods include fillRect in Graphics2D, clearRect to clear a region, and drawRect to draw an outline. Understanding coordinate systems (origin at the top-left in most Java graphical contexts) and color management via setColor is essential for predictable results.