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);
?>

<?php
header ("Content-type: image/jpeg");
$im = imagecreatetruecolor (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);
?>


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

<?php
header ("Content-type: image/jpeg");
$im = imagecreatetruecolor (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);
?>

Using two rectangles by changing colour

<?php
header ("Content-type: image/jpeg");
$im = imagecreatetruecolor (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);
?>

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

<?php
header ("Content-type: image/jpeg");
$im = imagecreatetruecolor (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);
?>

Changing colour of patterns

<?php
header ("Content-type: image/jpeg");
$im = imagecreatetruecolor (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);
?>

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

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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Draw Rectangle Outlines with imagerectangle()