imagerectangle() Drawing of rectangles line images using gd support in PHP

Draw a rectangle outline

imagerectangle() draws only the border. Use imagesetthickness() when a thicker outline is needed.

<?php
$image = imagecreatetruecolor(400, 240);
$background = imagecolorallocate($image, 255, 255, 255);
$red = imagecolorallocate($image, 200, 50, 50);
imagefilledrectangle($image, 0, 0, 399, 239, $background);
imagesetthickness($image, 3);
imagerectangle($image, 60, 50, 340, 190, $red);

header('Content-Type: image/png');
imagepng($image);
imagedestroy($image);
?>

Current example first; the original tutorial examples below are retained and cleaned up for continued learning.

header ("Content-type: image/jpeg");
$im = @ImageCreate (200, 200) 
or die ("Cannot Initialize new GD image stream");

$background_color = ImageColorAllocate ($im, 255, 255, 128);
$text_color = ImageColorAllocate ($im, 255, 0, 0);

imagerectangle ($im,0,0,199,199,$text_color);
//imagerectangle ($im,0,0,200,200,$text_color);


Imagejpeg ($im);
imagedestroy($im); //memory is removed.


imagerectangle ($im,0,0,199,199,$text_color);	imagerectangle ($im,0,0,200,200,$text_color);

Note that the canvas starts from 0,0 position. So to add border around one image we have to leave one pixel from the right and bottom edges.

Syntax

imagerectangle($image,$x1,$y1,$x2,$y2,$color)

`$image`	Image created using ImageCreate() or imagecreatetruecolor()
`$x1`	Upper left ( X : Horizontal ) coordinate of the rectangle
`$y1`	Upper left ( Y : Vertical ) coordinate of the rectangle
`$x2`	Bottom right ( X : Horizontal ) coordinate of the rectangle
`$y2`	Bottom right ( Y : Vertical ) coordinate of the rectangle
`$color`	Color of the borders by using imagecolorallocate().

Drawing rectangles & patterns using different thickness and colours using imagerectangle() in PHP GD

Example 1

Draw one rectangle using red colour.
Rectangle in red

header ("Content-type: image/jpeg");
$im = @ImageCreate (200, 200) 
or die ("Cannot Initialize new GD image stream");

$background_color = ImageColorAllocate ($im, 255, 255, 128);
$text_color = ImageColorAllocate ($im, 255, 0, 0); // red 

imagerectangle ($im,20,20,100,100,$text_color);

Imagejpeg ($im);
imagedestroy($im); //memory is removed.

Using two rectangles by changing colour

header ("Content-type: image/jpeg");
$im = @ImageCreate (200, 200) 
or die ("Cannot Initialize new GD image stream");

$background_color = ImageColorAllocate ($im, 255, 255, 128);
$text_color = ImageColorAllocate ($im, 255, 0, 0); // red 

imagerectangle ($im,20,20,100,100,$text_color);

$text_color = ImageColorAllocate ($im, 0, 0, 255); // blue
imagerectangle ($im,50,50,150,150,$text_color);

Imagejpeg ($im);
imagedestroy($im); //memory is removed.

Thickness of lines and generating patterns

By changing the value of $gap the gap between the rectangles can be changed. We used imagesetthickness() to change the thickness of the rectangles.
Patterns of rectangles

header ("Content-type: image/jpeg");
$im = @ImageCreate (601, 601) // added one pixel for border
or die ("Cannot Initialize new GD image stream");
$gap=10; // change this value to increase the lines 
$background_color = ImageColorAllocate ($im, 255, 255, 255);
$text_color = ImageColorAllocate ($im, 128, 255, 136);
imagesetthickness($im, 2);// thickness is changed
for($i=0;$i<=600;$i +=$gap){
imagerectangle ($im,$i,$i,(600-$i),(600-$i),$text_color);
}

Imagejpeg ($im);
imagedestroy($im); //memory is removed.

Changing colour of patterns

header ("Content-type: image/jpeg");
$im = @ImageCreate (601, 601) // added one pixel for border
or die ("Cannot Initialize new GD image stream");
$gap=10; // change this value to increase the lines 
$background_color = ImageColorAllocate ($im, 255, 255, 255);
$text_color = ImageColorAllocate ($im, 128, 255, 136);
imagesetthickness($im, 2);// thickness is changed
for($i=0;$i<=600;$i +=$gap){
$r=rand(1,255);
$g=rand(1,255);
$b=rand(1,255);
$text_color = ImageColorAllocate ($im, $r, $g, $b);	
imagerectangle ($im,$i,$i,(600-$i),(600-$i),$text_color);
}

Imagejpeg ($im);
imagedestroy($im); //memory is removed.

GD imagefilledrectangle() to create Bar Chart
GD functions GD imagearc()

Subhendu Mohapatra

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Draw Rectangle Outlines with imagerectangle()