PHP 8.4.2 Released!

    imagepolygon

    (PHP 4, PHP 5, PHP 7, PHP 8)

    imagepolygon — 绘制多边形

    说明

    自 PHP 8.0.0 起的签名（不支持命名参数）

    imagepolygon(GdImage $image, array $points, int $color): bool

    替代签名（从 PHP 8.1.0 开始弃用）

    imagepolygon(
        GdImage $image,
        array $points,
        int $num_points,
        int $color
    ): bool

    imagepolygon() 在指定 image 中创建多边形。

    参数

    image

    由图象创建函数(例如imagecreatetruecolor())返回的 GdImage 对象。

    points

    包含多边形顶点的数组，例如：

    points[0] = x0
    points[1] = y0
    points[2] = x1
    points[3] = y1

    num_points

    点（顶点）的总数，必须最少为 3。

    如果根据第二个签名省略此参数，则 points 必须具有偶数个元素，并且假定 num_points 为 count($points)/2。
    color

    颜色标识符使用 imagecolorallocate() 创建。

    返回值

    成功时返回 true， 或者在失败时返回 false。

    更新日志

    版本 说明
    8.1.0 弃用参数 num_points。
    8.0.0 image 现在需要 GdImage 实例；之前需要有效的 gd resource。

    示例

    示例 #1 imagepolygon() 示例

    <?php
    // Create a blank image
    $image = imagecreatetruecolor(400, 300);

    // Allocate a color for the polygon
    $col_poly = imagecolorallocate($image, 255, 255, 255);

    // Draw the polygon
    imagepolygon($image, array(
    0, 0,
    100, 200,
    300, 200
    ),
    3,
    $col_poly);

    // Output the picture to the browser
    header('Content-type: image/png');

    imagepng($image);
    imagedestroy($image);
    ?>

    以上示例的输出类似于：

    示例输出：imagepolygon()

    参见

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    用户贡献的备注 3 notes

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    3
    tatlar at yahoo dot com
    18 years ago
    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' ) ;
    ?>
    up
    2
    licson0729 at gmail dot com
    12 years ago
    Function to draw a n-sided regular polygon

    <?php
    $img     = imagecreatetruecolor(1360,768);

    function     regularPolygon($img,$x,$y,$radius,$sides,$color)
    {
    $points = array();
    for(    $a = 0;$a <= 360; $a += 360/$sides)
    {
    $points[] = $x + $radius * cos(deg2rad($a));
    $points[] = $y + $radius * sin(deg2rad($a));
    }
    return     imagepolygon($img,$points,$sides,$color);
    }

    regularPolygon($img,1360/2,768/2,300,8,0xffffff);//Test draw

    header('Content-type: image/png');
    imagepng($img);
    imagedestroy($img);
    ?>
    up
    -2
    jsnell at networkninja dot com
    23 years ago
    Here are some handy routines for rotation and translation of polygons. Scaling could be added easily as well.

    <?php
    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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