Low-Level Display: Canvas in Java

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Low-Level Display: Canvas
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FACE_SYSTEM FACE_MONOSPACE FACE_PROPORTIONAL STYLE_PLAIN STYLE_BOLD STYLE_ITALIC STYLE_UNDERLINED SIZE_SMALL SIZE_MEDIUM SIZE_LARGE Table 7-3
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System font face Monospace font face Proportional font face Plain font style Bold font style Italicized font style Underlined font style Small font size Medium font size Large font size
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You can determine the font face, font style, and font size of an instance of the Font class by calling the getFace() method, getStyle() method, and the getSize() method, respectively These methods return an integer that represents the value of the font constant listed in Table 7-3 The integer returned by the getStyle() method represents the combined style of the instance of the Font class, such as FontBOLD | FontITALIC You can use a series of other methods to query the individual font styles associated with a font These methods are isPlain(), isBold(), isItalic(), and isUnderlined() Each of these methods returns a boolean value that is true if the corresponding style is used in the font, otherwise a false value is returned
Aligning Text
Aligning text is probably the trickiest routine that you ll encounter when drawing text on the canvas because you ll need to know measurements of text that is already on the canvas as well as measurements of text being drawn Text is drawn within a virtual bounding box, which is an invisible box that defines the boundaries of the text First you specify a position on the screen by setting coordinates Let s call them x, y Next, you specify an anchor point that identifies the relationship of the coordinate to the bounding box
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Anchor Point Constant Description
LEFT HCENTER RIGHT TOP BASELINE BOTTOM Table 7-4 Coordinates represent the left edge of the boundary box Coordinates represent the horizontal center of the boundary box Coordinates represent the right edge of the boundary box Coordinates represent the top edge of the boundary box Coordinates represent the baseline for the text Coordinates represent the bottom edge of the boundary box
Anchor Point Constants
Suppose you want the coordinates to be the upper-left corner of the boundary box You then specify the anchor point TOP | LEFT Let s say that you want the coordinates to represent the lower-right corner of the boundary box You then use the BOTTOM | RIGHT anchor point The width and height of the text determine the coordinate of the opposite corner of the boundary box Anchor points are represented by anchor point constants, as shown in Table 7-4 There are three horizontal values, LEFT, HCENTER, and RIGHT, and three vertical values, TOP, BASELINE, and BOTTOM Horizontal and vertical values define the location within the bounding box of the specified coordinate The values are combined to define an anchor point Here s how this is done You pick a location on the screen, and if you want that position to be the upper-right of the bounding box, you set the anchor point to GRAPHICSTOP | GRAPHICSRIGHT The question that remains to be answered is how do you know which anchor point to use to draw your text However, there isn t a clear-cut answer Other text that abuts the boundary box usually determines text alignment within the boundary box Text is measured by ascent, descent, leading, font height, and advance Ascent is the measurement from the baseline of the text to the top of the highest character in the text Descent is from the baseline to the lowest character in the text Let s examine the following text to identify the ascent and descent: We work together The ascent is the distance between the bottom and the top of the W because the W is the highest character in the text The bottom of the W is the baseline The descent is the distance between the bottom of the g and the bottom of the W, or the bottom of any of the other characters of the text, because the g is the lowest character within the text
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