imagearc() Drawing of arc line images and circles using gd support in PHP

imagearc($image,$center_x,$center_y,$width,$height,
	$start_angle,$end_angle,$color)

`$image`	Image created using ImageCreate() or imagecreatetruecolor()
`$center_x`	x coordinate of center ( X : Horizontal )
`$center_y`	y coordinate of center ( Y : Vertical )
`$width`	Width of the arc
`$height`	Height of the arc
`$start_angle`	Angle of the start in degree. 3 Oclock position is 0 degree.
`$end_angle`	Angle of the end of the arc in degree.
`$color`	Color of the borders by using imagecolorallocate().

Drawing arc, circles and patterns using different colours, width and height by imagearc() in PHP GD

Creating full circle using imagearc()

We need to maintain $width and $height equal , $start_angle should be 0 (degree ) and $end_angle should be 360 ( degree ).

Example

<?Php
header ("Content-type: image/jpeg");
$width=300;$height=300;
$im = @ImageCreate ($width,$height) // added one pixel for border
or die ("Cannot Initialize new GD image stream");

$background_color = ImageColorAllocate ($im, 255, 255, 255);
$text_color = ImageColorAllocate ($im, 255, 0,0);
imagearc($im,150,150,290,290,0,360,$text_color); // outer face
imagearc($im,80,100,50,50,0,360,$text_color); // left eye 
imagearc($im,220,100,50,50,0,360,$text_color); // right eye
imagearc($im,150,150,150,150,45,135,$text_color); // mouth

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

Concentric circle using imagearc()

Common center for all the circles.
Circles using imagearac

<?Php
header ("Content-type: image/jpeg");
$width=601;$height=601;
$im = @ImageCreate ($width,$height) // added one pixel for border
or die ("Cannot Initialize new GD image stream");
$gap=20; // change this value to increase the lines 
$background_color = ImageColorAllocate ($im, 255, 255, 255);
$text_color = ImageColorAllocate ($im, 0, 255,250);
imagesetthickness($im,1);
$text_color = ImageColorAllocate ($im, 255, 0,0);
for($i=0;$i<=$width;$i +=$gap){
imagearc($im,$width/2,$height/2,($width)-$i,($height)-$i,0,360,$text_color);
}
Imagejpeg ($im);
imagedestroy($im); //memory is removed. 
?>

Change the colours of the circle by using random numbers between 1 and 255 ( R G B )
Color Circles using imagearac

<?Php
header ("Content-type: image/jpeg");
$width=601;$height=601;
$im = @ImageCreate ($width,$height) // added one pixel for border
or die ("Cannot Initialize new GD image stream");
$gap=20; // change this value to increase the lines 
$background_color = ImageColorAllocate ($im, 255, 255, 255);
imagesetthickness($im,1);
$text_color = ImageColorAllocate ($im, 255, 0,0);
for($i=0;$i<=$width;$i +=$gap){
$r=rand(1,255);
$g=rand(1,255);
$b=rand(1,255);	
$text_color = ImageColorAllocate ($im, $r, $g,$b);		
imagearc($im,$width/2,$height/2,($width)-$i,($height)-$i,0,360,$text_color);
}

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

Circle using imageellipse()

We can also use ellipse functions imageellipse() or imagefilledellipse() to draw circles by using equal width and height. Here there is no need to specify start angle and end angle.
GD functions imagefilledarc() imagerectangle() imageellipse() imagefilledellipse()

imagearc(): arc using PHP GD

Creating full circle using imagearc()

Example

Concentric circle using imagearc()

Circle using imageellipse()

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