28
Sep
Black Art of Java Game Programming by Joel
Black Art of Java Game Programming by Joel Fan Sams, Macmillan Computer Publishing ISBN: 1571690433 Pub Date: 11/01/96 Previous Table of Contents Next Creating Graphics Graphics operations are performed by a Graphics object (also known as a Graphics context). Graphics is a class that s defined in the package java.awt. Every applet has a Graphics object associated with it that addresses the screen real estate allocated for the applet. For example, the Graphics object of the applet from the preceding section paints to a rectangle that s 113 pixels wide and 117 pixels high. Figure 1-14 illustrates the coordinate system that s used by the Graphics object. Figure 1-14 Coordinate system of Graphics object Now let s look at some instance methods that java.awt.Graphics provides. Drawing drawLine(int x1, int y1, int x2, int y2) draws a line between (x1,y1) and (x2,y2). To draw a single point, use drawLine(x,y,x,y). drawRect(int x,int y,int w,int h) draws a rectangle at (x,y) with width w and height h. drawOval(int x, int y,int w,int h) draws an oval inside the rectangle at (x,y) with width w and height h. Filling fillRect(int x,int y,int w,int h) fills a rectangle with the specified dimensions. fillOval(int x,int y,int w,int h) fills an oval with the specified dimensions. Color setColor(Color c) sets the current Color of the Graphics object. Subsequent graphics
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