php生成文字png图片的函数

3. /*
4. php生成文字png图片，调用方式:
5. http://www.yourdomian.com/text_png.php3?msg=helloworld+class&rot=15&size=48&font=fonts/ARIAL.TTF
7. */
9. Header("Content-type: image/png");
11. class textPNG {
12. var $font = 'fonts/TIMES.TTF'; //默认字体. 相对于脚本存放目录的相对路径.
13. var $msg = "undefined"; // 默认文字.
14. var $size = 24;
15. var $rot = 0; // 旋转角度.
16. var $pad = 0; // 填充.
17. var $transparent = 1; // 文字透明度.
18. var $red = 0; // 在黑色背景中...
19. var $grn = 0;
20. var $blu = 0;
21. var $bg_red = 255; // 将文字设置为白色.
22. var $bg_grn = 255;
23. var $bg_blu = 255;
25. function draw() {
26. $width = 0;
27. $height = 0;
28. $offset_x = 0;
29. $offset_y = 0;
30. $bounds = array();
31. $image = "";
33. // 确定文字高度.
34. $bounds = ImageTTFBBox($this->size, $this->rot, $this->font, "W");
35. if ($this->rot $font_height = abs($bounds[7]-$bounds[1]);
36. } else if ($this->rot > 0) {
37. $font_height = abs($bounds[1]-$bounds[7]);
38. } else {
39. $font_height = abs($bounds[7]-$bounds[1]);
40. }
42. // 确定边框高度.
43. $bounds = ImageTTFBBox($this->size, $this->rot, $this->font, $this->msg);
44. if ($this->rot $width = abs($bounds[4]-$bounds[0]);
45. $height = abs($bounds[3]-$bounds[7]);
46. $offset_y = $font_height;
47. $offset_x = 0;
49. } else if ($this->rot > 0) {
50. $width = abs($bounds[2]-$bounds[6]);
51. $height = abs($bounds[1]-$bounds[5]);
52. $offset_y = abs($bounds[7]-$bounds[5])+$font_height;
53. $offset_x = abs($bounds[0]-$bounds[6]);
55. } else {
56. $width = abs($bounds[4]-$bounds[6]);
57. $height = abs($bounds[7]-$bounds[1]);
58. $offset_y = $font_height;;
59. $offset_x = 0;
60. }
62. $image = imagecreate($width+($this->pad*2)+1,$height+($this->pad*2)+1);
64. $background = ImageColorAllocate($image, $this->bg_red, $this->bg_grn, $this->bg_blu);
65. $foreground = ImageColorAllocate($image, $this->red, $this->grn, $this->blu);
67. if ($this->transparent) ImageColorTransparent($image, $background);
68. ImageInterlace($image, false);
70. // 画图.
71. ImageTTFText($image, $this->size, $this->rot, $offset_x+$this->pad, $offset_y+$this->pad, $foreground, $this->font, $this->msg);
73. // 输出为png格式.
74. imagePNG($image);
75. }
76. }
78. $text = new textPNG;
80. if (isset($msg)) $text->msg = $msg; // 需要显示的文字
81. if (isset($font)) $text->font = $font; // 字体
82. if (isset($size)) $text->size = $size; // 文字大小
83. if (isset($rot)) $text->rot = $rot; // 旋转角度
84. if (isset($pad)) $text->pad = $pad; // padding
85. if (isset($red)) $text->red = $red; // 文字颜色
86. if (isset($grn)) $text->grn = $grn; // ..
87. if (isset($blu)) $text->blu = $blu; // ..
88. if (isset($bg_red)) $text->bg_red = $bg_red; // 背景颜色.
89. if (isset($bg_grn)) $text->bg_grn = $bg_grn; // ..
90. if (isset($bg_blu)) $text->bg_blu = $bg_blu; // ..
91. if (isset($tr)) $text->transparent = $tr; // 透明度 (boolean).
93. $text->draw();
94. ?>

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