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Graphics
* GetImageSize
* ImageArc
* ImageChar
* ImageCharUp
* ImageColorAllocate
* ImageColorDeAllocate
* ImageColorAt
* ImageColorClosest
* ImageColorExact
* ImageColorResolve
* ImageGammaCorrect
* ImageColorSet
* ImageColorsForIndex
* ImageColorsTotal
* ImageColorTransparent
* ImageCopy
* ImageCopyResized
* ImageCreate
* ImageCreateFromGIF
* ImageCreateFromJPEG
* ImageCreateFromPNG
* ImageCreateFromWBMP
* ImageCreateFromString
* ImageDashedLine
* ImageDestroy
* ImageFill
* ImageFilledPolygon
* ImageFilledRectangle
* ImageFillToBorder
* ImageFontHeight
* ImageFontWidth
* ImageGIF
* ImagePNG
* ImageJPEG
* ImageWBMP
* ImageInterlace
* ImageLine
* ImageLoadFont
* ImagePolygon
* ImagePSBBox
* ImagePSEncodeFont
* ImagePSFreeFont
* ImagePSLoadFont
* ImagePsExtendFont
* ImagePsSlantFont
* ImagePSText
* ImageRectangle
* ImageSetPixel
* ImageString
* ImageStringUp
* ImageSX
* ImageSY
* ImageTTFBBox
* ImageTTFText
* ImageTypes
* read_exif_data

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Manual: ImagePolygon
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  Updated
Thu, 01 Mar 2001
 ImagePSBBox 
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ImagePolygon

(PHP 3, PHP 4 )

ImagePolygon -- Draw a polygon

Description

int imagepolygon (int im, array points, int num_points, int col)

ImagePolygon() creates a polygon in image id. Points is a PHP array containing the polygon's vertices, ie. points[0] = x0, points[1] = y0, points[2] = x1, points[3] = y1, etc. Num_points is the total number of vertices.

See also imagecreate().


User Contributed Notes: ImagePolygon

ecofarm@mullum.com.au
25-Jan-2001 09:37am
Create an array of points for the polygon... example script follows

(note you may have to change png to gif or whatever image format your version of php is configured with)


<pre>
&lt;?php

Header ("Content-type: image/png");

/////// set up array of points for polygon ///////

$a = array(
"0" => "40", // x1
"1" => "50", // y1
"2" => "20", // x2
"3" => "240", // y2
"4" => "60", // x3
"5" => "60", // y3
"6" => "240", // x4
"7" => "20", // y4
"8" => "50", // x5
"9" => "40", // y5
"10" => "10", // x6
"11" => "10", // y6
);

///// create canvas /////

$im = ImageCreate (250, 250);

//define colors.. first color declared is set as background

$white = ImageColorAllocate ($im, 255, 255, 255);
$blue = ImageColorAllocate ($im, 0, 0, 255);


// draw a polygon

ImageFilledPolygon ($im, $a, 6, $blue );

// create the image

ImagePng ($im);

// destroy the image to free memory

ImageDestroy ($im);
?>
</pre>

jsnell@networkninja.com
17-Feb-2001 07:07pm
Here are some handy routines for rotation and translation of polygons. Scaling could be added easily as well.

function translate_point(&$x,&$y,$angle,$about_x,$about_y,$shift_x,$shift_y)
{
$x -= $about_x;
$y -= $about_y;
$angle = ($angle / 180) * M_PI;
/* math:
[x2,y2] = [x, * [[cos(a),-sin(a)],
y] [sin(a),cos(a)]]
==>
x = x * cos(a) + y*sin(a)
y = x*-sin(a) + y*cos(a)
*/

$new_x = $x * cos($angle) - $y * sin($angle);
$new_y = $x * sin($angle) + $y * cos($angle);
$x = $new_x+ $about_x + $shift_x ;
$y = $new_y + $about_y + $shift_y;
}

function translate_poly($point_array, $angle, $about_x, $about_y,$shift_x,$shift_y)
{
$translated_poly = Array();
while(count($point_array) > 1)
{
$temp_x = array_shift($point_array);
$temp_y = array_shift($point_array);
translate_point($temp_x, $temp_y, $angle, $about_x, $about_y,$shift_x, $shift_y);
array_push($translated_poly, $temp_x);
array_push($translated_poly, $temp_y);
}
return $translated_poly;
}

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  Updated
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 ImagePSBBox 
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