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NOTE Detailed coverage of the AWT's support for painting, including graphics, fonts, and font
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To paint to the surface of an applet involves these steps: 1 In the applet class, override the paint( ) method specified by Component (and inherited by Applet)
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2 Inside your version of paint( ), use one or more of the AWT-based output methods defined by the Graphics class Two are used in this recipe: drawString( ), which outputs a text string, and drawLine( ), which draws a line 3 You can set the drawing color by calling setForeground( ) To set the background, call setBackground( ) 4 To cause output to be displayed, call repaint( ) This will result in a call to paint( )
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The paint( ) method is defined by Component and is inherited by Applet It is shown here: void paint(Graphics g) This method is called each time that an applet must redisplay its output This situation can occur for several reasons For example, the window in which the applet is running can be overwritten by another window and then uncovered Or, the applet window can be minimized and then restored The paint( ) method is also called when the applet begins execution Whatever the cause, whenever the applet must redraw its output, paint( ) is called Therefore, paint( ) is where you will put the code that outputs to the surface of an applet The paint( ) method has one parameter of type javaawtGraphics This parameter contains the graphics context, which describes the graphics environment in which the applet is running This context is used by various drawing methods, such as drawString( ) Graphics also defines various methods that output to the applet s surface Two of these methods are used by this recipe The first is drawString( ), which outputs a text string It is shown here: void drawString(String msg, int x, int y) This method outputs the string passed in msg, beginning at the X,Y location specified by x and y The string is drawn in the current foreground color In a Java window, the upper-left corner is location 0,0 However, x and y specify the upper-left edge of the baseline of the characters, not their upper-left corner Therefore, you must take this into consideration when attempting to write a string in the upper-left corner of the window The second output method is drawLine( ), which draws a line It is shown here: void drawLine(int startX, int startY, int endX, int endY) It draws a line in the current foreground color The line begins at startX,startY and ends at endX,endY You can set the background color by calling setBackground( ) You can set the drawing color by calling setForeground( ) These methods are specified by Component They are shown here void setBackground(Color newColor) void setForeground(Color newColor)
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Here, newColor specifies the new color The class Color, which is packaged in javaawt, defines the constants shown here that can be used to specify colors:
Colorblack Colorblue Colorcyan ColordarkGray Colorgray Colorgreen ColorlightGray Colormagenta Colororange Colorpink Colorred Colorwhite Coloryellow
Uppercase versions of the constants are also defined As a general rule, an applet never calls paint( ) directly Instead, when the surface of the applet needs to be painted, it will execute a call to repaint( ) The repaint( ) method is defined by the AWT It requests that the runtime system execute paint( ) Thus, for another part of your applet to output to its window, simply store the output and then call repaint( ) This causes a call to paint( ), which can display the stored information For example, if part of your applet needs to output a string, it can store this string in a String variable and then call repaint( ) Inside paint( ), you will output the string using drawString( )
NOTE Technically, calling repaint( ) on heavyweight components (including Applet and JApplet)
results in a call to update( ), which in its default implementation calls paint( ) Therefore, if you override update( ), you must make sure that paint( ) is ultimately called The repaint( ) method has four forms The one used by this recipe is shown here: void repaint( ) This version causes the entire window to be repainted Other versions of repaint( ) let you specify a region to be repainted
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