java qr code scanner library Figure 4.4 The built-in fonts for GD. in Java

Creation QR Code in Java Figure 4.4 The built-in fonts for GD.

Figure 4.4 The built-in fonts for GD.
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These fonts are not pretty, but they do a reasonably good job for most low-resolution graphics, such as the ones you would display on a web page. Additionally, because they are compiled in and of a fixed size, they are really fast to use. For the built-in fonts, you can use the string(), stringUp(), char() and charUp() object methods. The last two methods are an inheritance from the C interface of libgd; in Perl, of course, there is no formal distinction between characters and strings.
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$im->string (gdMediumBoldFont, 0, 0, 'Black Medium Bold', $black); $im->stringUp(gdGiantFont, 0, 100, 'Red Giant', $red); $im->char (gdSmallFont, 50, 50, 'A', $black); $im->charUp (GD::Font->Tiny , 60, 50, 'B', $black);
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This example uses both the short name and the full GD::Font object name as arguments to the methods; they are interchangeable. The coordinates that these functions expect denote the upper left corner for string() and char(), and the lower left corner for stringUp() and charUp(). Of course, from the string s perspective, these are both the upper left corner, and maybe that s a better way to look at it. There are some methods available for the GD::Font objects that can be used to retrieve information.
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$nchars $offset $width $height = = = = gdGiantFont->nchars; GD::Font->Tiny->offset; gdSmallFont->width; gdSmallFont->height;
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The nchars() method tells us how many characters this font provides, and the offset() method gives us the ASCII value of the first character in the font. The width() and height() methods return the dimensions of a single character in the font, which is useful, since that means we don t have to hard-code font sizes in our programs.
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Table 4.3 The text drawing primitives for GD. The top part of the table shows all methods that work on the built-in fonts, and the bottom part of the table shows the method that can be used for TrueType fonts. Note that the possibilities of drawing TrueType strings are more flexible and advanced than for built-in fonts. string(font,x,y,string,color) stringUp(font,x,y,string,color) char(font,x,y,char,color) charUp(font,x,y,char,color) stringTTF(color,font,size, angle,x,y,string) draw a horizontal string starting at the specified point draw a vertical string starting at the specified point draw a single character starting at the specified point draw a vertical character starting at the specified point draw a string with a TrueType font of the specified size starting at the specified point
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TrueType fonts and GD
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Versions of GD since 1.20 also support TrueType fonts, which can be drawn with the stringTTF() method. This method can be called as an object method ($gd_object->stringTTF()), in which case it draws the string on the calling object, or as a class method (GD::Image->stringTTF()), in which case it returns the bounding box of the text to be drawn, without actually drawing it. The list returned from this method consists of eight elements, denoting four coordinate pairs: the x and y coordinates of the lower left, lower right, upper right and upper left corner, in that order. The stringTTF() method draws the string aligned to the left side of the baseline of the font. The following code first requests the bounding box for a string, and then adapts the coordinates by subtracting the horizontal and vertical offset from the baseline. This ensures that the string is aligned to the requested coordinates with its upper left corner.
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DRAWING WITH GD
$text $font $fontsize $angle ($x, $y)
= = = = =
'String'; '/usr/share/fonts/ttfonts/arialbd.ttf'; 12; 0; (20, 25);
@bb = GD::Image->stringTTF(0, $font, $fontsize, $angle, $x, $y, $text); $x += $x - $bb[6]; $y += $y - $bb[7]; $im->stringTTF($black, $font, $fontsize, $angle, $x, $y, $text);
You might wonder why we bother recalculating the x coordinate as well as the y coordinate. That is because sometimes the bounding box returned by stringTTF() is slightly offset to the right; in other words, the baseline used to draw the string is not always exactly vertically aligned with the requested coordinates. If you don t need such precision, you can dispense with this check.
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