文字

imagepolygon

(PHP 4, PHP 5, PHP 7)

imagepolygon画一个多边形

说明

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

imagepolygon() 在图像中创建一个多边形。points 是一个 PHP 数组,包含了多边形的各个顶点坐标,即 points[0] = x0,points[1] = y0,points[2] = x1,points[3] = y1,以此类推。num_points 是顶点的总数。

Example #1 imagepolygon() 例子

<?php
// create a blank image
$image  imagecreatetruecolor ( 400 300 );

// fill the background color
$bg  imagecolorallocate ( $image 0 0 0 );

// choose 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
header ( "Content-type: image/png" );
imagepng ( $image );

?>

参见 imagecreate() imagecreatetruecolor()

用户评论:

[#1] licson0729 at gmail dot com [2012-05-23 11:21:34]

Here's a function to draw a n-sided star:

<?php
function drawStar($img,$x,$y,$radius,$sides,$color,$spikness=0.5)
{
    
$point =array();
    
$t 0;
    for(
$a 0;$a <= 360;$a += 360/($sides*2))
    {
        
$t++;
        if(
$t == 0)
        {
            
$point[] = $x + ($radius $spikness) * cos(deg2rad($a));
            
$point[] = $y + ($radius $spikness) * sin(deg2rad($a));
        }else{
            
$point[] = $x $radius cos(deg2rad($a));
            
$point[] = $y $radius sin(deg2rad($a));
        }
    }
    return 
imagepolygon($img,$point,$sides*2,$color);
}
?>

[#2] licson0729 at gmail dot com [2012-05-21 10:39:47]

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);
?>

[#3] tatlar at yahoo dot com [2006-09-11 16:48:08]

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 ;                                                                                                                    
    
$point[0]['x'] = $x ;                                                                                                                 
    
$point[0]['y'] = $y $radius ;                                                                                                       
    
$point[2]['x'] = $x + ( $radius cosdeg2rad90 $angle ) ) ) ; 
    
$point[2]['y'] = $y - ( $radius sindeg2rad90 $angle ) ) ) ;
    
$point[4]['x'] = $x + ( $radius sindeg2rad180 - ( $angle*) ) ) ) ;
    
$point[4]['y'] = $y + ( $radius cosdeg2rad180 - ( $angle*) ) ) ) ;
    
$point[6]['x'] = $x - ( $radius sindeg2rad180 - ( $angle*) ) ) ) ;                                                            
    
$point[6]['y'] = $y + ( $radius cosdeg2rad180 - ( $angle*) ) ) ) ;
    
$point[8]['x'] = $x - ( $radius cosdeg2rad90 $angle ) ) ) ;                                                                   
    
$point[8]['y'] = $y - ( $radius sindeg2rad90 $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 cosdeg2rad90 $angle/) ) ) ;                                                             
        
$point[1]['y'] = $y - ( $indent sindeg2rad90 $angle/) ) ) ;                                                     
        
$point[3]['x'] = $x + ( $indent sindeg2rad180 $angle ) ) ) ;                                                              
        
$point[3]['y'] = $y - ( $indent cosdeg2rad180 $angle ) ) ) ;
        
$point[5]['x'] = $x ;                                                                                                             
        
$point[5]['y'] = $y + ( $indent sindeg2rad180 $angle ) ) ) ;
        
$point[7]['x'] = $x - ( $indent sindeg2rad180 $angle ) ) ) ;                                                              
        
$point[7]['y'] = $y - ( $indent cosdeg2rad180 $angle ) ) ) ;                                                              
        
$point[9]['x'] = $x - ( $indent cosdeg2rad90 $angle/) ) ) ;                                                             
        
$point[9]['y'] = $y - ( $indent sindeg2rad90 $angle/) ) ) ;
    }
    
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 _makeFiveSidedStar10010050'star' ) ;
?>

[#4] jsnell at networkninja dot com [2001-02-17 19:07:01]

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;


    
$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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