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As you ll recall from 6, each MIDlet has one instance of the Display class, and the Display class has one derived class called the Displayable class Everything a MIDlet displays on the screen is created by an instance of a class that is derived from the Displayable class The Display class hierarchy is shown here: public class Display public abstract class Displayable public abstract class Screen extends Displayable public abstract class Canvas extends Displayable public class Graphics The Displayable class has two subclasses: Screen and Canvas The Screen class and its derivatives are used to create high-level components that you learned about in the previous chapter The Canvas class and its derivatives are used to gain low-level access to the display, which is necessary for graphic- and animation-based applications A graphic is used with a canvas You can think of an instance of the Canvas class as an artist s canvas on which you draw images that might include text An instance of the Graphics class is similar to the artist s tools that are used to draw an image For example, color, lines, and arcs are some of the graphic tools available to create an image on the canvas The Canvas class and

determines the transmission of packets to a given destination on a path determined also by the source address (this was impossible in Ipv4) The IPv6 routing must also provide good support for mobility for example, to those users who, by means of a portable PC and a cellular phone, can connect themselves to the Internet in different places

If you tell the program to use dithering (you can specify any amount of dithering between 0 and 100 percent), it may use multiple colors in a checkerboard pattern in those areas to give the appearance of the color you removed If no dithering is used, the removed colors are replaced with another solid color (see Figure 14-6) Dithering can be useful in giving the appearance of gradations or subtle color shifts, but be forewarned, it adds to the file size

7:

Figure 14-6

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the Graphics class give you pixel control over everything that appears on the canvas This low-level control is particularly noticeable whenever text is placed on the canvas because you control every aspect of how characters are formed to display the text Let s step back to recall how you display text using the high-level user interface First, you create an instance of a text field, text box, or string item and then associate text with the instance Next, the setCurrent() is called and passed the instance (or a container such as a form that contains the instance) You don t need to be concerned about describing how the device s application manager is to form each character of the text on the screen However, displaying text using the Graphics class requires you to specify the height, width, and other characteristics that describe how each character of the text is to be drawn on the screen Your application is actually drawing each character as compared to simply specifying the text that you want displayed You ll learn how to draw characters later in this chapter A Canvas is created by instantiating a concrete subclass, which is discussed later in this chapter

Few images actually need all 256 colors available in a GIF color palette Try reducing the number of colors all the way down to 8 or 16, and work your way back up as high as you need to go to make the image look acceptable This assures that you reach the minimum colors more easily than if you try to work from the most colors on down Remember, the fewer colors in the palette, the smaller the file size

The canvas is divided into a virtual grid in which each cell represents one pixel Coordinates mark the column and row of a cell within the grid (Figure 7-1) The x coordinate represents the column, and the y coordinate represents the cell s row The first cell located in the upper-left corner of the grid has the coordinate location of 0, 0, where the first zero is the x coordinate and the other zero is the y coordinate As you probably imagine, the size of the canvas is device dependent since canvas size and the screen size are the same The screen size of a mobile telephone might be different from the screen size of a PDA, and yet both devices are capable of running the same MIDlet Your MIDlet should determine the canvas size of the device that implements your graphic application before drawing on the screen The canvas size is measured in pixels Your MIDlet should determine the canvas size of the device by calling the getWidth() and getHeight() methods of the Canvas class

.

Figure 7-1

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