How to draw geometric figures in php using GD2

This article mainly introduces the use of GD2 to draw geometric figures in PHP, and analyzes the common functions and specific usage techniques involved in GD2 drawing in the form of examples. Friends in need can refer to the following

The examples in this article describe PHP How to draw geometric figures using GD2. Share it with everyone for your reference, the details are as follows:

Using the GD2 function can not only draw line graphics, but also draw filled graphics, such as filled circles, filled rectangles, etc. The following is an introduction to the drawing methods of filled graphics commonly used in GD2.

bool imagefill( resource image, int x, int y, int color )

The imagefill() function is at the coordinates (x, y) of the image image (the image's The upper left corner is (0,0)) and the area is filled with color (that is, all points with the same color as (x, y) and adjacent points will be filled).

bool imagefilledarc ( resource image , int cx , int cy , int w , int h , int s , int e , int color , int style )

imagefilledarc( ) Draw an elliptical arc using cx, cy (the upper left corner of the image is 0, 0) in the image represented by image. Returns TRUE on success, or FALSE on failure. w and h specify the width and height of the ellipse, respectively, and the s and e parameters specify the start and end points in degrees. style can be the bitwise OR (OR) of the following values:

IMG_ARC_PIE
IMG_ARC_CHORD
IMG_ARC_NOFILL
IMG_ARC_EDGED

IMG_ARC_PIE and IMG_ARC_CHORD are Mutually exclusive; IMG_ARC_CHORD just connects the start and end points with a straight line, while IMG_ARC_PIE produces a circular boundary (if both are used, IMG_ARC_CHORD takes effect). IMG_ARC_NOFILL specifies that the arc or chord has only an outline, not a fill. IMG_ARC_EDGED specifies a straight line connecting the start and end points to the center point. Used with IMG_ARC_NOFILL, this is a good way to draw the outline of a pie chart (without filling it).

bool imagefilledellipse ( resource image , int cx , int cy , int w , int h , int color )

imagefilledellipse() In the image represented by image Draw an ellipse with cx, cy (the upper left corner of the image is 0, 0) as the center. w and h specify the width and height of the ellipse respectively. The ellipse is filled with color. Returns TRUE on success, or FALSE on failure.

bool imagefilledrectangle( resource image, int x1, int y1, int x2, int y2, int color )

This function draws a rectangle filled with color in the image image. The coordinates of its upper left corner are (x1, y1) and the coordinates of the lower right corner are (x2, y2). (0,0) is the upper left corner of the image.

For example: apply the above function to draw filled circles and filled squares, the code is as follows

<?php
  header("Content-type: image/png");//将图像输出到浏览器
  $img = imagecreate(400, 200);//创建一个400X200的画布
  $bg = imagecolorallocate($img, 0, 0, 255);//设置背景颜色
  $white = imagecolorallocate($img, 255, 255 ,255);//设置填充颜色
  imagefilledellipse($img, 100, 100, 150, 150, $white);//绘制填充圆形
  imagefilledrectangle($img, 200, 50, 300, 150, $white);//绘制填充正方形
  imagepng($img);//以png格式输出图像
  imagedestroy($img);//释放资源

The running results are as follows

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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