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Digg  imagepolygon
Draws a polygon
(PHP 4, PHP 5)
Example 1018. imagepolygon() example<?phpThe above example will output something similar to:  Code Examples / Notes » imagepolygonglowell
Something to be aware of, ImagePolygon appears to convert the array of points passed to it from whatever format they may have been in originally into integers. This means if you pass it an array of floats (after running a rotation routine for example) the floats will be changed to integers INSIDE THE ORIGINAL ARRAY. An extreme example: if for some reason you had an unit-sized polygon pt-array ( -1<x|y<1 for easy scaling purpose for instance) and for some reason your code calls imagepolygon on it (why? it'd only be a dot anyway) the array would be unusable after that (all either 1s, 0s or -1s). Scaling a unit-sized array, drawing it and then scaling it again will also may have a different result than expected. Obviously, if the array in its original state is important to your code, it should use a copy of the original array for this call. If your code draws the same polygon multiple times but resizes it for different cases, you should have each size be created off an original template rather than adjusting a single polygon array. jsnell
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; } tatlar
Function to get 5-sided polygon (pentagon) or star (pentagram) co-ords. <?php function _makeFiveSidedStar( $x, $y, $radius, $shape='polygon', $spiky=NULL ) { $point = array() ; // new array $angle = 360 / 5 ; $point[0]['x'] = $x ; $point[0]['y'] = $y - $radius ; $point[2]['x'] = $x + ( $radius * cos( deg2rad( 90 - $angle ) ) ) ; $point[2]['y'] = $y - ( $radius * sin( deg2rad( 90 - $angle ) ) ) ; $point[4]['x'] = $x + ( $radius * sin( deg2rad( 180 - ( $angle*2 ) ) ) ) ; $point[4]['y'] = $y + ( $radius * cos( deg2rad( 180 - ( $angle*2 ) ) ) ) ; $point[6]['x'] = $x - ( $radius * sin( deg2rad( 180 - ( $angle*2 ) ) ) ) ; $point[6]['y'] = $y + ( $radius * cos( deg2rad( 180 - ( $angle*2 ) ) ) ) ; $point[8]['x'] = $x - ( $radius * cos( deg2rad( 90 - $angle ) ) ) ; $point[8]['y'] = $y - ( $radius * sin( deg2rad( 90 - $angle ) ) ) ; if( $shape == 'star' ) { if( $spiky == NULL ) $spiky = 0.5 ; // degree of spikiness, default to 0.5 $indent = $radius * $spiky ; $point[1]['x'] = $x + ( $indent * cos( deg2rad( 90 - $angle/2 ) ) ) ; $point[1]['y'] = $y - ( $indent * sin( deg2rad( 90 - $angle/2 ) ) ) ; $point[3]['x'] = $x + ( $indent * sin( deg2rad( 180 - $angle ) ) ) ; $point[3]['y'] = $y - ( $indent * cos( deg2rad( 180 - $angle ) ) ) ; $point[5]['x'] = $x ; $point[5]['y'] = $y + ( $indent * sin( deg2rad( 180 - $angle ) ) ) ; $point[7]['x'] = $x - ( $indent * sin( deg2rad( 180 - $angle ) ) ) ; $point[7]['y'] = $y - ( $indent * cos( deg2rad( 180 - $angle ) ) ) ; $point[9]['x'] = $x - ( $indent * cos( deg2rad( 90 - $angle/2 ) ) ) ; $point[9]['y'] = $y - ( $indent * sin( deg2rad( 90 - $angle/2 ) ) ) ; } ksort( $point ) ; $coords = array() ; // new array foreach( $point as $pKey=>$pVal ) { if( is_array( $pVal ) ) { foreach( $pVal as $pSubKey=>$pSubVal ) { if( !empty( $pSubVal ) ) array_push( $coords, $pSubVal ) ; } } } return $coords ; } $values = _makeFiveSidedStar( 100, 100, 50, 'star' ) ; ?> |
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