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Manual: ImageArc

Updated
Sat, 12 Aug 2000

ImageArc

(unknown)

ImageArc -- Draw a partial ellipse

Description

int imagearc (int im, int cx, int cy, int w, int h, int s, int e, int col)

ImageArc() draws a partial ellipse centered at cx, cy (top left is 0, 0) in the image represented by im. W and h specifies the ellipse's width and height respectively while the start and end points are specified in degrees indicated by the s and e. arguments.

User Contributed Notes: ImageArc

andrea@labo.net
22-Dec-1999 09:53

in php 3.05 (debian 2.1r4) drawing a circle is impossible: the function imagearc($im,100,100,30,30,0,360,$black) doesn't draw anything, but imagearc($im,100,100,30,30,0,359,$black) draws a circle (more or less).

travis@duluth.com
22-Dec-1999 06:36

The wierd thing is that the first two integers tell where to place the "circle". So for example I first create the "pallet" to place the circle on. $image = imagecreate(500, 500); (this makes a huge 500x500 gif :) ) $colorBody = imagecolorallocate($image, 0, 0, 0); (make the default color of the "pallet" black $circleColor = imagecolorallocate($image, 255, 0, 255); (going to make the circle an ugly pink color) imagearc($image, 250, 250, 300, 300, 0, 360, $circleColor); Places the image in the center (250,250) and the circle is 300 pixels in diameter. Hope this helps. Travis Kent Beste

light@buypages.com
23-Dec-1999 03:36

<PRE>You should note that: a) the arc is drawn counter-clockwise b) angle=0 is at the three-o'clock position hence, 90 == 6 o'clock, 180=9 'oclock etc. </PRE>

lbattraw@att.com
12-Apr-2000 02:33

Also remember that 0 degrees and 360 degrees are mathematically identical (per note #1); you're essentially specifying the same point if you use 0 and 360 as start and end angles, respectively. It's open to debate whether or not this should be construed as drawing a whole circle or nothing at all...

i_patton@hotmail.com
28-Apr-2000 06:15

I have code that works in creating a picture, and then outputting it to a file (I can tell because the file shows), but none of the commands to draw inside the new gif, including imagearc, work. The picture, no matter what I do, is identical to the original picture. Anybody know why? | Liam |

rolf.winterscheidt@it-mannesmann.de
24-Jul-2000 04:27

How do I get something like ImageFilledArc? I need a partial filled circle, not the whole thing filled. Rolf

rupert@complinet.com
02-Aug-2000 12:15

can anyone think of a way of aliasing the curve? ps; re:filled arc; you're going to have to draw in the radii and then use imagefill()

Updated
Sat, 12 Aug 2000

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