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imagearc
Synopsis
int imagearc(image, start-x, start-y, width, height, degrees
start, degrees end,
color);
int image: Image
identifier
int start-x: Starting x
coordinate
int start-y: Starting y
coordinate
int width: Width of arc
int height: Height of
arc
int degrees start: Starting
angle
int degrees end: Ending
angle
int color: Color
Description
imagearc() draws an arc or ellipse of the specified color, centered at the x and y starting points. The height and width represent the major and minor axes of the ellipse, respectively. The hardest part to grasp of imagearc() is how the start and end angles work. 0 angle is the right-hand end of the minor axis of the ellipse. From there, the angle travels around the circumference of the ellipse, moving down and around to the left. Specifying a start angle of 0 and an ending angle of 90, for example, would create an arc starting at the middle right and ending at the lower left. A start of 180 and end of 270 would create a similarly-sized arc that has been rotated 180 degrees around the center of the ellipse. To draw a full ellipse, specify a start angle of 0 and an end angle of 360.
Example
header("Content-type: image/png");
$im = imagecreate(200, 200);
$red = imagecolorallocate($im, 255, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);
$green = imagecolorallocate($im, 0, 255, 0);
imagefill($im, 0, 0, $red);
imagearc($im,100, 100, 180, 150, 0, 360, $white);
imagearc($im,100, 100, 70, 90, 90, 270, $green);
imagearc($im,100, 100, 50, 50, 270, 90, $green);
imagepng($im);
imagedestroy($im);