简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Home> Backend Development> PHP Tutorial> body text

How to draw sine and cosine curves on pictures in php

WBOY
Release： 2016-07-25 08:55:28
Original
1044 people have browsed it
  2. /**
  3. * How to draw sine and cosine curves on pictures
  4. * edit: bbs.it-home.org
  5. */
  6. define("MAX_WIDTH_PIXEL", 600);
  7. define("MAX_HEIGHT_PIXEL", 240);
  8. //Send header information
  9. header("Content -type: image/gif");
  10. //Create image
  11. $img = imageCreate(MAX_WIDTH_PIXEL, MAX_HEIGHT_PIXEL);
  12. //Set color
  13. $bgcolor = imageColorAllocate($img, 0xff, 0xe9, 0xe9);
  14. $red = imageColorAllocate($img, 255, 0, 0);
  15. $blue = imageColorAllocate($img, 0, 0, 255);
  16. $brown = imageColorAllocate($img, 100, 0, 0);
  17. $black = imageColorAllocate ($img, 0, 0, 0);
  18. $width = MAX_WIDTH_PIXEL/2; //Width
  19. $height = MAX_HEIGHT_PIXEL/2; //Height
  20. //Establish coordinate axis
  21. imageLine($img, $width, 0, $width, MAX_HEIGHT_PIXEL, $black);//y-axis
  22. imageLine($img, 0, $height, MAX_WIDTH_PIXEL, $height, $black);//x-axis
  23. //Depicting function graphics through loops
  24. for ($i=0; $i<=MAX_WIDTH_PIXEL; $i++)
  25. {
  26. $y1 = 100 * sin($i/100 * M_PI);
  27. imageSetPixel($img, $i, $height+$y1, $blue) ;
  28. $y2 = 100 * sin($i/300 * M_PI);
  29. imageSetPixel($img, $i, $height+$y2, $red);
  30. $y3 = 100 * sin($i/300 * M_PI) ;
  31. imageSetPixel($img, $i, $height-$y3, $brown);
  32. }
  33. //Display graphics
  34. imageGif($img);
  35. //Release resources
  36. imageDestroy($img);
  37. ?>
Copy code


Related labels：
php在图片上绘制正余弦曲线的方法
source：php.cn
Previous article：PHP automatically generates thumbnails based on URL (source code attached) Next article：Example code for dynamically generating line charts with PHP GD library
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
objective-c - iOS -- 图片旋转缩放后，怎么才能通过Quartz 2D 绘制在UIView上? 求助：图片经过旋转缩放后等操作，无法正确的通过- (void)drawRect:(CGRect)rect方法绘制在UIView上
From 2017-04-18 09:27:34
0
0
160
javascript - canvas中的fillText在IE8和更早版本中比例失调 使用canvas在IE下绘制折线图，因为要支持IE8以及更早版本，所以引用了html5.js和excanvas.js两个库。当使用fillText方法在canvas中添加文本的时候...
From 2017-04-11 13:12:45
0
1
184
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn：Public welfare online PHP training，Help PHP learners grow quickly！