Java Illuminated, 5th Edition

4.2 The Graphics Coordinate System and Color

JavaFX’s GraphicsContext class, in the javafx.scene.canvas package, provides methods to draw figures such as rectangles, circles, and lines; to set the colors for drawing; and to write text in a window.

To draw on the window, we specify the location where we want to put our shapes and the color we want the shapes to have.

A window is composed of pixels, which can be thought of as colored dots. A window with a width of 700 pixels and a height of 400 pixels has a total of 28,000 (700 * 400) pixels. Each pixel has a location expressed using an (x, y) coordinate system. The x coordinate specifies the horizontal position, beginning at 0 on the left side of the window and increasing as you move to the ...