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A rectangle is an area of the canvas defined by four corners, just like a rectangle that you can draw using paper and pencil You define a rectangle s dimensions by identifying coordinates for the upper-left corner and the lower-right corner Four types of rectangles can be drawn on a canvas These are an outlined rectangle, filled rectangle, outlined rectangle with rounded corners, and a filled rectangle with rounded corners An outlined rectangle is one where only line segments connecting the corners are drawn The inside of the rectangle remains the same color as the outside of the rectangle The
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filled rectangle also draws line segments to connect corners, but the inside of the rectangle is filled with the same color as the drawn line segments And as the names imply, each of these types of rectangles can have squared corners or rounded corners You create an outlined rectangle by calling the drawRect() method and the filled rectangle by calling the fillRect() method Both methods create a square-cornered rectangle and require four parameters The first two parameters are the coordinates of the upperleft corner of the rectangle (x1, y1), and the last two parameters are the width and height of the rectangle (x2, y2) The color used to draw a rectangle must be set using the setColor() method (discussed previously in this chapter) before drawing the rectangle Otherwise the current color of the graphic context is used both to color the outline and fill the inside of the rectangle, depending on the type of rectangle being drawn By setting the color of the graphic context that draws a filled rectangle to 255, 255, 255 and using 0, 0, getWidth(), getHeight() as the coordinates of the rectangle, you can erase all images from the canvas Creating a round-cornered rectangle is nearly identical to creating a square-cornered rectangle, except you must specify the horizontal and vertical diameter of the arc used to create the round corners The horizontal diameter is referred to as the arc width, and the vertical diameter is referred to as the arc height The diameter represents the sharpness of the corner, where the smaller the diameter, the sharper the corner appears Both the horizontal and vertical diameters are defined as integers You should experiment using different diameter values before deciding on the diameters that are best to use with your application You create a round-cornered rectangle by calling the drawRoundRect() method and fillRoundRect() method, respectively Both methods require six parameters The first four parameters identify the upper-left corner and lower-right corner of the rectangle The fifth and sixth parameters are integers representing the horizontal diameter and vertical diameter of the corners
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We are going to look at two ways to draw a rectangle on the canvas Listing 7-7 draws two outlined rectangles, one with square corners and the other with rounded corners Listing 7-8 contains the JAD file for Listing 7-7 Listing 7-9 draws the same two rectangles, except these are filled rectangles Its JAD file appears in Listing 7-10 The listings begin like the other listings discussed in this chapter, by declaring references for instances of the Display class and the MyCanvas class, which is defined within these listings These instances are created and assigned within the constructor The required methods for a MIDlet are then defined
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The structure of the MyCanvas class definition also resembles those of other listings that you ve explored previously in this chapter First, references are declared for the Exit command and the instances of the MIDlet class The actual instances are created in the constructor of the MyCanvas definition where they are also assigned to these references The Exit command and the CommandListener are both then associated with the canvas You ll notice that the definition of the paint() methods of Listing 7-7 and Listing 7-9 are different from each other The paint() method in Listing 7-7 draws an outlined rectangle with square corners using the default color of the graphic context This rectangle appears in the upper-left portion of the canvas, where the upper-left corner is located at coordinate 2, 2 and the width and height of the rectangle is 20, 20 Next, a rounded corner outlined rectangle is drawn on the same canvas at a location lower than the first rectangle The upper-left corner of this rectangle is at coordinate 20, 20, and the width and height are 60, 60 Since this is a round-cornered rectangle, we also need
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