imagefilledarc

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

imagefilledarc — 绘制部分弧形并填充

说明

imagefilledarc(
    GdImage $image,
    int $center_x,
    int $center_y,
    int $width,
    int $height,
    int $start_angle,
    int $end_angle,
    int $color,
    int $style
): bool

在指定 image 中以指定坐标为中心绘制部分弧形。

参数

image

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

center_x

中间的 x 坐标。

center_y

中间的 y 坐标。

width

弧形宽度。

height

弧形高度。

start_angle

弧形起始角，以度为单位。

end_angle

弧形结束角度，以度为单位。0° 位于三点钟位置，顺时针绘制弧形。

color

颜色标识符使用 imagecolorallocate() 创建。

style

值可以是下列值的按位或（OR）：

IMG_ARC_PIE
IMG_ARC_CHORD
IMG_ARC_NOFILL
IMG_ARC_EDGED

IMG_ARC_PIE 和 IMG_ARC_CHORD 是互斥的；IMG_ARC_CHORD 只是用直线连接了起始和结束点，IMG_ARC_PIE 则产生圆形边界。IMG_ARC_NOFILL 指明弧或弦只有轮廓，不填充。IMG_ARC_EDGED 指明用直线将起始和结束点与中心点相连，和 IMG_ARC_NOFILL 一起使用是画饼状图轮廓的好方法（而不用填充）。

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
8.0.0	`image` 现在需要 GdImage 实例；之前需要有效的 `gd` resource。

示例

示例 #1 创建 3D 外观的饼图

<?php

// 创建图像
$image = imagecreatetruecolor(100, 100);

// 分配一些颜色
$white    = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$gray     = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);
$darkgray = imagecolorallocate($image, 0x90, 0x90, 0x90);
$navy     = imagecolorallocate($image, 0x00, 0x00, 0x80);
$darknavy = imagecolorallocate($image, 0x00, 0x00, 0x50);
$red      = imagecolorallocate($image, 0xFF, 0x00, 0x00);
$darkred  = imagecolorallocate($image, 0x90, 0x00, 0x00);

// 创建 3D 效果
for ($i = 60; $i > 50; $i--) {
   imagefilledarc($image, 50, $i, 100, 50, 0, 45, $darknavy, IMG_ARC_PIE);
   imagefilledarc($image, 50, $i, 100, 50, 45, 75 , $darkgray, IMG_ARC_PIE);
   imagefilledarc($image, 50, $i, 100, 50, 75, 360 , $darkred, IMG_ARC_PIE);
}

imagefilledarc($image, 50, 50, 100, 50, 0, 45, $navy, IMG_ARC_PIE);
imagefilledarc($image, 50, 50, 100, 50, 45, 75 , $gray, IMG_ARC_PIE);
imagefilledarc($image, 50, 50, 100, 50, 75, 360 , $red, IMG_ARC_PIE);


// 输出图像
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>

以上示例的输出类似于：

add a note

User Contributed Notes 16 notes

down

Mike ¶

17 years ago


The previous example does not work well.  This is much better and faster:

<?php
$Randomized = rand(1,20);
for($i=0;$i<=$Randomized;$i++){$data[$i]=rand(2,20);};//full array with garbage.
$imgx='600';$imgy='400';//Set Image Size. ImageX,ImageY
$cx = '300';$cy ='150'; //Set Pie Postition. CenterX,CenterY
$sx = '600';$sy='300';$sz ='100';// Set Size-dimensions. SizeX,SizeY,SizeZ

$data_sum = array_sum($data);
//convert to angles.
for($i=0;$i<=$Randomized;$i++){
   $angle[$i] = (($data[$i] / $data_sum) * 360);
   $angle_sum[$i] = array_sum($angle);
};
$im  = imagecreate ($imgx,$imgy);
$background = imagecolorallocate($im, 255, 255, 255);
//Random colors.
for($i=0;$i<=$Randomized;$i++){
   $r=rand(100,255);$g=rand(100,255);$b=rand(100,255);   
   $colors[$i] = imagecolorallocate($im,$r,$g,$b);
   $colord[$i] = imagecolorallocate($im,($r/1.5),($g/1.5),($b/1.5));
}
//3D effect.
for($z=1;$z<=$sz;$z++){
        // first slice
    imagefilledarc($im,$cx,($cy+$sz)-$z,$sx,$sy,0
    ,$angle_sum[0],$colord[0],IMG_ARC_EDGED);
   for($i=1;$i<=$Randomized;$i++){
        imagefilledarc($im,$cx,($cy+$sz)-$z,$sx,$sy,$angle_sum[$i-1]
        ,$angle_sum[$i],$colord[$i],IMG_ARC_NOFILL);
   };
};
//Top pie.
   // first slice
   imagefilledarc($im,$cx,$cy,$sx,$sy,0 ,$angle_sum[0], $colors[0], IMG_ARC_PIE);
for($i=1;$i<=$Randomized;$i++){
   imagefilledarc($im,$cx,$cy,$sx,$sy,$angle_sum[$i-1] ,$angle_sum[$i], $colors[$i], IMG_ARC_PIE);
};
//Output.
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

down

vrp76 at mail dot ru ¶

8 years ago


The analogue of the function

<?php

function myimagefilledarc($image, $cx, $cy, $width, $height, $start, $end, $color, $style = IMG_ARC_PIE){ 
  
    $delta = 0.1;
    $twoPi = 2*pi();
    
    $w = $width/2;
    $h = $height/2;
    
    if($h<=$w){
        $kx=$w;
        $ky=$w*$h/$w;
    }else{
        $kx=$h*$w/$h;
        $ky=$h;
    }
    
    $StartRad = deg2rad($start);
    $EndRad   = deg2rad($end);
        
    $array_points[] = $cx;
    $array_points[] = $cy;
    
    $a = $StartRad;

    if($style==IMG_ARC_PIE 
     or $style==IMG_ARC_EDGED 
     or $style==(IMG_ARC_PIE|IMG_ARC_NOFILL) 
     or $style==(IMG_ARC_EDGED|IMG_ARC_NOFILL)){
        
        if($StartRad>=$EndRad){
            
            $b[] = $twoPi;
            $b[] = $EndRad;
            
        }else $b[] = $EndRad;
            
    }else $b[] = 0;
     
    foreach($b as $vb){
        do {    
            $array_points[] = $cx + $kx*cos($a);
            $array_points[] = $cy + $ky*sin($a);
            $a += $delta; 
        } while ($a<$vb);
        $a = 0;
    }
    
    $array_points[] = $cx + $kx*cos($EndRad);
    $array_points[] = $cy + $ky*sin($EndRad);
    
    $count_array_points    = count($array_points);
    $num_points = $count_array_points/2;
    
    if($style==IMG_ARC_PIE or $style==IMG_ARC_EDGED or $style==IMG_ARC_CHORD){
        imagefilledpolygon($image, $array_points, $num_points, $color);
    }elseif($style==(IMG_ARC_PIE|IMG_ARC_NOFILL)){
        
        $i = 1; 
        $c = $count_array_points - 1;
        
        $x1 = $array_points[++$i];
        $y1 = $array_points[++$i];
        
        do { 
            $x2 = $array_points[++$i]; 
            $y2 = $array_points[++$i];
            imageline($image, $x1, $y1, $x2, $y2, $color);
            $x1 = $x2; 
            $y1 = $y2; 
        } while ($i<$c);
            
    }elseif($style==(IMG_ARC_CHORD|IMG_ARC_NOFILL) or $style==(IMG_ARC_PIE|IMG_ARC_NOFILL)){
        imageline($image, $array_points[2], $array_points[3], $array_points[4], $array_points[5], $color);
    }else{    
        imagepolygon($image, $array_points, $num_points, $color);    
    }
    
}

$image = imagecreatetruecolor(900, 1250);

$white        = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$gray[]     = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);
$gray[]     = imagecolorallocate($image, 0x90, 0x90, 0x90);
$navy[]     = imagecolorallocate($image, 0x00, 0x00, 0x80);
$navy[]     = imagecolorallocate($image, 0x00, 0x00, 0x50);
$red[]      = imagecolorallocate($image, 0xFF, 0x00, 0x00);
$red[]      = imagecolorallocate($image, 0x90, 0x00, 0x00);
$yellow[]    = imagecolorallocate($image, 0xFF, 0xFF, 0x00);
$yellow[]    = imagecolorallocate($image, 0x90, 0x90, 0x00);

$Cx = 200;
$Cy = 100;

$W = 300;
$H = 100;

$Dx = 500;
$Dy = 0;
$Dy_3d = 40;

$Angles['yellow']    = array(180,0);
$Angles['gray']        = array(0,88);
$Angles['navy']        = array(88,92);
$Angles['red']        = array(92,180);

$styles['IMG_ARC_PIE'] = IMG_ARC_PIE;  

$styles['IMG_ARC_CHORD'] = IMG_ARC_CHORD;

$styles['IMG_ARC_PIE|IMG_ARC_NOFILL'] = IMG_ARC_PIE|IMG_ARC_NOFILL;

$styles['IMG_ARC_CHORD|IMG_ARC_NOFILL'] = IMG_ARC_CHORD|IMG_ARC_NOFILL;

$styles['IMG_ARC_PIE|IMG_ARC_EDGED|IMG_ARC_NOFILL'] = IMG_ARC_PIE|IMG_ARC_EDGED|IMG_ARC_NOFILL;

$styles['IMG_ARC_CHORD|IMG_ARC_EDGED|IMG_ARC_NOFILL'] = IMG_ARC_CHORD|IMG_ARC_EDGED|IMG_ARC_NOFILL;

imagestring($image, 5, 130, 15, 'imagefilledarc', $white);

imagestring($image, 5, 130 + $Dx, 15, 'myimagefilledarc', $white);

foreach($styles as $name_style => $style){

    
    for ($i = $Cy+$Dy_3d; $i > $Cy; $i--) {
        foreach($Angles as $colors=>$angle){
            imagefilledarc($image, $Cx, $i+$Dy, $W, $H, $angle[0], $angle[1],$$colors[1], $style);
        }
    }
            
    foreach($Angles as $colors=>$angle){
        imagefilledarc($image, $Cx, $Cy+$Dy, $W, $H, $angle[0], $angle[1],$$colors[0], $style);
    }
    
    
    for ($i = $Cy+$Dy_3d; $i > $Cy; $i--) {
        foreach($Angles as $colors=>$angle){
            myimagefilledarc($image, $Cx+$Dx, $i+$Dy, $W, $H, $angle[0], $angle[1],$$colors[1], $style);
        }
    }
            
    foreach($Angles as $colors=>$angle){
        myimagefilledarc($image, $Cx+$Dx, $Cy+$Dy, $W, $H, $angle[0], $angle[1],$$colors[0], $style);
    }
    
    imagestring($image, 5, 450-strlen($name_style)*8/2, $Cy+$Dy+$H-10, $name_style, $yellow[0]);

    $Dy+=200;
}

 
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);

?>

down

splogamurugan at gmail dot com ¶

13 years ago


A simple pie chart generation script. 

Displays the percentage at center arc and displays the Legends with random colors. 



<?php

class simplepie

{

    function __construct($width, $height, $dataArr)

    {

        $font = './verdana.ttf'; /** get it from c:/windows/fonts dir */

        $this->image = imagecreate($width,$height);

        $piewidth = $width * 0.70;/* pie area */

        $x = round($piewidth/2);

        $y = round($height/2);

        $total = array_sum($dataArr);

        $angle_start = 0;

        $ylegend = 2;

        imagefilledrectangle($this->image, 0, 0, $width, $piewidth, imagecolorallocate($this->image, 128, 128, 128));

        foreach($dataArr as $label=>$value) {

            $angle_done    = ($value/$total) * 360; /** angle calculated for 360 degrees */

            $perc          = round(($value/$total) * 100, 1); /** percentage calculated */

            $color         = imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));

            imagefilledarc($this->image, $x, $y, $piewidth, $height, $angle_start, $angle_done+= $angle_start, $color, IMG_ARC_PIE);

            $xtext = $x + (cos(deg2rad(($angle_start+$angle_done)/2))*($piewidth/4));

            $ytext = $y + (sin(deg2rad(($angle_start+$angle_done)/2))*($height/4)); 

            imagettftext($this->image, 6, 0, $xtext, $ytext, imagecolorallocate($this->image, 0, 0, 0), $font, "$perc %");

            imagefilledrectangle($this->image, $piewidth+2, $ylegend, $piewidth+20, $ylegend+=20, $color); 

            imagettftext($this->image, 8, 0, $piewidth+22, $ylegend, imagecolorallocate($this->image, 0, 0, 0), $font, $label);

            $ylegend += 4;

            $angle_start = $angle_done;

        }

    }

    function render()

    {

        header('Content-type: image/png');

        imagepng($this->image);

    }

}

/** usage */

$dataArr = array(2001=>10, 2002=>30, 2003=>50, 2004=>10);

$width=600;

$height=480;

$pie = new simplepie($width, $height, $dataArr);

$pie->render();

?>

down

caist - www.caist.com ¶

20 years ago


if you want to place a text onto the edge of a circle you need to
get a point on the circle:

$pos_x=$radius*sin(deg2rad($angle));
$pos_y=sqrt($radius*$radius-$pos_x*$pos_x);

if you want the point to be in the middle of a pie piece
you need a starting and ending angle

$pos_x=$radius*sin(deg2rad($angle_end-($angle_start)/2));
$pos_y=sqrt($radius*$radius-$pos_x*$pos_x);

hope it helps

down

xcoda3 at web dot de ¶

9 years ago


For everyone who will use imageellipse() with a border (imagesetthickness() not working correctly).
This function simualtes the standard gd border.

<?php

function imageEllipseWithBorder($image, $centerX, $centerY, $width, $height, $color, $borderWidth)
    {
        // Calculate inner and outer strength of border
        $borderOuterStrength = (($borderWidth - 1) / 2);
        $borderInnerStrength = ((($borderWidth - 1) / 2) + 1);

        // Caculate x-/y-offset from 0/0 position to ellipse center
        $ellipseXOffset = $centerX - ($width / 2) - $borderOuterStrength;
        $ellipseYOffset = $centerY - ($height / 2) - $borderOuterStrength;

        // Create temp image for editing
        $tempImageWidth  = $width + ($borderOuterStrength * 2) + 1;
        $tempImageHeight = $height + ($borderInnerStrength * 2) + 1;
        $tempImage = imagecreatetruecolor($tempImageWidth, $tempImageHeight);
        imagealphablending($tempImage, false);

        // Fill temp image with "transparent" color
        $transparent = imagecolorallocatealpha($tempImage, 255, 255, 255, 127);
        imagefill($tempImage, 0, 0, $transparent);

        // Draw outer ellipse (representing the border)
        imagefilledellipse(
            $tempImage,
            $centerX - $ellipseXOffset,
            $centerY - $ellipseYOffset,
            $width  + $borderOuterStrength * 2,
            $height + $borderOuterStrength * 2,
            $color
        );

        // Draw inner ellipse (transparent area)
        imagefilledellipse(
            $tempImage,
            $centerX - $ellipseXOffset,
            $centerY - $ellipseYOffset,
            $width - $borderInnerStrength * 2,
            $height - $borderInnerStrength * 2,
            $transparent
        );

        // "Paste" ellipse (with transparent inner area) into image at original position
        imagealphablending($image, true);
        imagecopy(
            $image,
            $tempImage,
            $ellipseXOffset + ($borderWidth + 1) % 2,
            $ellipseYOffset + ($borderWidth + 1) % 2,
            0,
            0,
            $tempImageWidth,
            $tempImageHeight
        );
    }

?>

down

floripondia dot 88 at hotmail dot com ¶

11 years ago


If you want to make a pie graph with exploded slices and data shows on each one and data side right too you can use this snippet.
<?php
$values = array("2010" => 1950, "2011" => 750, "2012" => 2100, "2013" => 580, "2014" => 5000);
$total = count($values);
$data = ($total == 0) ? array(360) : array_values($values);
$keys = ($total == 0) ? array("") : array_keys($values);
$radius = 30;
$imgx = 1800 + $radius;
$imgy = 600 + $radius;
$cx = 400 + $radius;
$cy = 200 + $radius;
$sx = 800;
$sy = 400;
$sz = 150;
$data_sum = array_sum($data);
$angle_sum = array(-1 => 0, 360);
$typo = "./helvetica.ttf";
$im = imagecreate($imgx, $imgy);
imagecolorallocate($im, 255, 255, 255);
$color = array(
    array(220, 20, 60),
    array(77, 33, 114),
    array(249, 141, 53),
    array(158, 37, 59),
    array(1, 128, 128),
    array(28, 94, 160),
    //array(206, 16, 118),
    array(43, 67, 86),
    //array(155, 108, 166),
    array(83, 69, 62)
);
shuffle($color);
shuffle($color);
shuffle($color);
$colors = array(imagecolorallocate($im, $color[0][0], $color[0][1], $color[0][2]));
$colord = array(imagecolorallocate($im, ($color[0][0] / 1.5), ($color[0][1] / 1.5), ($color[0][2] / 1.5)));
$factorx = array();
$factory = array();
for($i = 0; $i < $total; $i++){
    $angle[$i] = (($data[$i] / $data_sum) * 360);
    $angle_sum[$i] = array_sum($angle);
    $colors[$i] = imagecolorallocate($im, $color[$i][0], $color[$i][1], $color[$i][2]);
    $colord[$i] = imagecolorallocate($im, ($color[$i][0] / 1.5), ($color[$i][1] / 1.5), ($color[$i][2] / 1.5));
    $factorx[$i] = cos(deg2rad(($angle_sum[$i - 1] + $angle_sum[$i]) / 2));
    $factory[$i] = sin(deg2rad(($angle_sum[$i - 1] + $angle_sum[$i]) / 2));
}
for($z = 1; $z <= $sz; $z++){
    for($i = 0; $i < $total; $i++){
        imagefilledarc($im, $cx + ($factorx[$i] * $radius), (($cy + $sz) - $z) + ($factory[$i] * $radius), $sx, $sy, $angle_sum[$i - 1], $angle_sum[$i], $colord[$i], IMG_ARC_PIE);
    }
}
for($i = 0; $i < $total; $i++){
    imagefilledarc($im, $cx + ($factorx[$i] * $radius), $cy + ($factory[$i] * $radius), $sx, $sy, $angle_sum[$i - 1], $angle_sum[$i], $colors[$i], IMG_ARC_PIE);
    imagefilledrectangle($im, 900, 50 + ($i * 50 * 2), 950, 100 + ($i * 50 * 2), $colors[$i]);
    imagettftext($im, 50, 0, 970, 100 + ($i * 50 * 2), imagecolorallocate($im, 0, 0, 0), $typo, $keys[$i]);
    imagettftext($im, 40, 0, $cx + ($factorx[$i] * ($sx / 4)) - 40, $cy + ($factory[$i] * ($sy / 4)) + 10, imagecolorallocate($im, 0, 0, 0), $typo, $data[$i]);
}
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

down

Christopher Kramer ¶

15 years ago


If this function is not available because you're using an old gdlib version, here is a workaround if you want to draw a pie chart:

<?php

// width and height of the image
$width=200;
$height=200;

$simulate_old_gd=true; // do not use imagefilledarc although available? 

// the pieces of the pie (in degree)
$pieces=array(180,90,45,25,15,5);

$diagram=imagecreate($width,$height);

// background color
$white=imagecolorallocate($diagram, 255, 255, 255);
imagefilledrectangle($diagram,0,0,$width,$height,$white);

// the circle is 2px smaller than the image
$width-=2;
$height-=2;

// we need a border color
$black=imagecolorallocate($diagram, 0, 0, 0);

// draw the border of the pie
imagearc($diagram, round($width/2), round($height/2), 
         $width, $height, 0, 360, $black);

// position (in degrees) where to place the next piece
$position=270; 
// we will use calculated gray colors for simple example
$gray=0; 

foreach($pieces as $deg)
 {
 // calculate the gray color
 $gray+=30;
 if($gray>255) $gray=0;
 $color=imagecolorallocate($diagram,$gray,$gray,$gray);
 
 // position must be kept < 360
 if($position>360) $position-=360;

 if(!$simulate_old_gd && is_callable('imagefilledarc'))
  {  
  imagefilledarc($diagram, round($width/2), 
  round($height/2), $width, $height, $position, 
  $position+$deg, $color,IMG_ARC_EDGED);
  }
 else
  {
  // we use some maths to calculate the pixel on the circle
  $pix_x=round(floor(($width-2)/2)*cos($position/180*M_PI)
         +round($width/2));
  $pix_y=round(floor(($height-2)/2)*sin($position/180*M_PI)
         +round($height/2));
  // now we  draw a line from the mid of the circle to the
  // calculated pixel on the circle
  imageline($diagram, round($width/2), round($height/2), 
            $pix_x, $pix_y, $black);
  // now we need a pixel for flood filling.
  //- We could use maths to calculate a pixel inside the 
  // piece:
  //$fill_x=round(floor(($width-10)/2)*
  //        cos(($position+2)/180*M_PI)+round($width/2));
  //$fill_y=round(floor(($height-10)/2)*
  //        sin(($position+2)/180*M_PI)+round($height/2));
  //- or we could use an universal pixel with less maths ;)  
  // (top mid):
  $fill_x=floor($width/2)-2;
  $fill_y=3;
  // now we flood fill the circle
  @imagefilltoborder ($diagram,$fill_x,$fill_y,$black,$color);
  /* (it does not matter here that we fill more than we need
      because the next pieces will fix this)
     IF YOU ONLY WANT ONE PIECE
     (simulate imagefilledarc) you'd have to draw
     both border lines and flood fill afterwards */
  }
 // the position of the next piece is $deg degrees further
 $position+=$deg;
 }
 
// output the image
header('Content-type: image/png');
imagepng($diagram);
imagedestroy($digram);
?>

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mateusz dot charytoniuk at gmail dot com ¶

15 years ago


The code below uses colors from "hans at lintoo dot dk"'s note. It delivers pie charts with labels:

<?php
$bright_list = array(
    array(255, 203, 3),
    array(220, 101, 29),
    array(189, 24, 51),
    array(214, 0, 127),
    array(98, 1, 96),
    array(0, 62, 136),
    array(0, 102, 179),
    array(0, 145, 195),
    array(0, 115, 106),
    array(178, 210, 52),
    array(137, 91, 74),
    array(82, 56, 47)
);
$dark_list = array(
    array(205, 153, 0),
    array(170, 51, 0),
    array(139, 0, 1),
    array(164, 0, 77),
    array(48, 0, 46),
    array(0, 12, 86),
    array(0, 52, 129),
    array(0, 95, 145),
    array(0, 65, 56),
    array(128, 160, 2),
    array(87, 41, 24),
    array(32, 6, 0)
);

$data = array();
$angle = array();
$title = array();
$i = 0;
foreach( $_GET as $key => $value ) {
    $data[$i] = intval($value);
    $title[$i++] = str_replace("_"," ",strval($key));
}
$sum = array_sum($data);
if( $sum == 0 ) {
    ++ $sum;
}
$count = count($data);
for( $i = 0; $i < $count; ++ $i ) {
    $angle[$i] = floor($data[$i]/$sum*360);
    if( $angle[$i] == 0 ) {
        ++ $angle[$i];
    }
}
$sum_angle = array_sum($angle);
if( $sum_angle < 360 ) {
    $angle[0]+=360-$sum_angle;
}

$height = $count*34;
if( $height < 180 ) {
    $height = 180;
}

$im  = imagecreate (350, $height);
$background = imagecolorallocate($im, 226, 226, 226);
$border = imagecolorallocate($im,97,97,97);
$font_color = imagecolorallocate($im,0,0,0);
$font = 'yourfont.ttf';

$bright = array();
foreach( $bright_list as $c ) {
    $bright[] = imagecolorallocate($im,$c[0],$c[1],$c[2]);
}

$dark = array();
foreach( $dark_list as $c ) {
    $dark[] = imagecolorallocate($im,$c[0],$c[1],$c[2]);
}
$tmp = 0;
for( $i =0; $i < $count; ++ $i ) {
    for( $j = 100; $j > 90; -- $j ) {
        imagefilledarc($im, 100, $j, 180, 120, $tmp, $tmp+$angle[$i], $dark[$i], IMG_ARC_PIE);
    }
    $tmp += $angle[$i];
}

$tmp = 0;
for( $i =0; $i < $count; ++ $i ) {
    imagefilledarc($im, 100, 90, 180, 120, $tmp, $tmp+$angle[$i], $bright[$i], IMG_ARC_PIE);
    $tmp += $angle[$i];
}
for( $i = 0; $i < $count; ++ $i ) {
    imagefilledrectangle($im, 209, 19+($i*30), 231, 41+($i*30), $border);
    imagefilledrectangle($im, 210, 20+($i*30), 230, 40+($i*30), $bright[$i]);
    imagefttext($im, 11, 0, 240, 34+($i*30), $font_color, $font, $title[$i]);
}
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

try 'pie.php?foo=3&bar=4&baz=6'

down

imazir at gmail dot com ¶

18 years ago


The previous example does not work. Try those modifications and you will have the expected results :

<?
$Randomized = rand(1,20);
for($i=0;$i<=$Randomized;$i++){$data[$i]=rand(2,20);};//full array with garbage.
$imgx='200';$imgy='200';//Set Image Size. ImageX,ImageY
$cx = '100';$cy ='50'; //Set Pie Postition. CenterX,CenterY
$sx = '200';$sy='100';$sz ='20';// Set Size-dimensions. SizeX,SizeY,SizeZ

$data_sum = array_sum($data);
//convert to angles.
for($i=0;$i<=$Randomized;$i++){
   $angle[$i] = (($data[$i] / $data_sum) * 360);
   $angle_sum[$i] = array_sum($angle);
};
$im  = imagecreate ($imgx,$imgy);
$background = imagecolorallocate($im, 255, 255, 255);
//Random colors.
for($i=0;$i<=$Randomized;$i++){
   $r=rand(100,255);$g=rand(100,255);$b=rand(100,255);    
   $colors[$i] = imagecolorallocate($im,$r,$g,$b);
   $colord[$i] = imagecolorallocate($im,($r/2),($g/2),($b/2));
}
//3D effect.
for($z=1;$z<=$sz;$z++){
   for($i=1;$i<=$Randomized;$i++){
imagefilledarc($im,$cx,($cy+$sz)-$z,$sx,$sy,$angle_sum[$i-1]
,$angle_sum[$i],$colord[$i],IMG_ARC_PIE);
   };
};
//Top pie.
for($i=1;$i<=$Randomized;$i++){
   imagefilledarc($im,$cx,$cy,$sx,$sy,$angle_sum[$i-1] ,$angle_sum[$i], $colors[$i], IMG_ARC_PIE);
};
//Output.
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

down

paulcharltonthomson at hotmail dot com ¶

19 years ago


Here's a slightly better way to get the colours for the pie chart shaded wall as posted by double-zonk at wp dot pl

<?php

$rgb0 = array (255, 153, 204); 
$rgb1 = array (255, 153, 0); 
$rgb2 = array (153, 204, 0); 
$rgb3 = array (51, 153, 102); 
$rgb4 = array (51, 204, 204); 
$rgb5 = array (51, 102, 255); 
$rgb6 = array (128, 0, 128); 
$rgb7 = array (150, 150, 150); 

for ($r = 0; $r < 8; ++$r)
    { 
        if(${"rgb" . $r}[0] < 50) $shadowr = 0; else $shadowr = ${"rgb" . $r}[0] - 50; 
        if(${"rgb" . $r}[1] < 50) $shadowg = 0; else $shadowg = ${"rgb" . $r}[1] - 50; 
        if(${"rgb" . $r}[2] < 50) $shadowb = 0; else $shadowb = ${"rgb" . $r}[2] - 50; 
        ${"wall" . $r} = array ($shadowr, $shadowg, $shadowb); 
    } 

for ($s = 0; $s < 8; ++$s)
    { 
        $kolor[$s] = imagecolorallocate($image, ${"rgb" . $s}[0], ${"rgb" . $s}[1], ${"rgb" . $s}[2]); 
        $cien[$s] = imagecolorallocate($image, ${"wall" . $s}[0], ${"wall" . $s}[1], ${"wall" . $s}[2]); 
    } 

?>

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rich at dicksonlife dot com ¶

20 years ago


Even more efficiency:

The original code snippet and the following suggestions are inefficient in that they rely on the overlying php to fill vertically using loops rather than taking advantage of the underlying drawing routines. Also, this is done by repeatedly drawing filled partial elipses and circular calculations are typically expensive (PHP may use tables, I'm not sure) The original code could be rewritten as 

<?php
// Add the bottom layer.
  imagefilledarc($image, 50, 60, 100, 50, 0, 45, $darknavy, IMG_ARC_PIE);
  imagefilledarc($image, 50, 60, 100, 50, 45, 75 , $darkgray, IMG_ARC_PIE);
  imagefilledarc($image, 50, 60, 100, 50, 75, 360 , $darkred, IMG_ARC_PIE);

//Now do the joining pieces.
//Note: Precompute cosines and sines for efficiency
  $c1=50*cos(45/180*M_PI);
  $s1=25*sin(45/180*M_PI);
  $c2=50*cos(75/180*M_PI);
  $s2=25*sin(75/180*M_PI);

  $area1=array(100,60,100,50,50+$c1,50+$s1,50+$c1,60+$s1);
  $area2=array(50+$c1,50+$s1,50+$c1,60+$s1,50+$c2,60+$s2,50+$c2,50+$s2);
//Note that piece 3 goes round the corner. So we are only interested in the leftmost extent. You would need to do this programatically. Also, you do not need to make vertical parts for any segments completely at the back of the pie (in fact, not filledarcs either)
  $area3=array(50+$c2,50+$s2,50+$c2,60+$s2,0,60,0,50);

  imagefilledpolygon($image, $area1 , 4 , $darknavy);
  imagefilledpolygon($image, $area2 , 4 , $darkgray);
  imagefilledpolygon($image, $area3 , 4 , $darkred);

  imagefilledarc($image, 50, 50, 100, 50, 0, 45, $navy, IMG_ARC_PIE);
  imagefilledarc($image, 50, 50, 100, 50, 45, 75 , $gray, IMG_ARC_PIE);
  imagefilledarc($image, 50, 50, 100, 50, 75, 360 , $red, IMG_ARC_PIE);
?>

Note that the polygons are perhaps slightly inefficient. If there was an imagefilledtriangle, this code would be simpler. Given how fundamental triangles are, perhaps for a future version?

Rich

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hans at lintoo dot dk ¶

20 years ago


I found some bugs in my script.. and therefore I am posting the fixes:
Bugs:
<?php
$drakcolor[2] = imagecolorallocate($im, 139, 0, 1);
//Should be
$darkcolor[2] = imagecolorallocate($im, 139, 0, 1);
?>

And then if you modify the code a little and, then make a image 200x125 then you won't be wasting space.
Changes:
<?php
$im  = imagecreate (200, 125);
// AND
for ($i = 60; $i > 50; $i--) {
    imagefilledarc($im, 100, $i, 200, 100, $anglesum[$f], $anglesum[$n], $darkcolor[$f], IMG_ARC_PIE);
}
// AND
       imagefilledarc($im, 100, 50, 200, 100, $anglesum[$n], $anglesum[$i], $randcolor[$n], IMG_ARC_PIE);
?>
you can see a online demo at: http://webstatistik.lintoo.dk/

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hans at lintoo dot dk ¶

20 years ago


I modificed the code to make a 3d pie from data collected elsewhere.... in this case it was for a statistics page...

when testing you can use:

enjoy

<?php
//Making a image 200 x 200
$im  = imagecreate (200, 200);

//Setting background color
$background = imagecolorallocate($im, 226, 226, 226);

//Setting colors of elements
$randcolor[0] = imagecolorallocate($im, 255, 203, 3);
$randcolor[1] = imagecolorallocate($im, 220, 101, 29);
$randcolor[2] = imagecolorallocate($im, 189, 24, 51);
$randcolor[3] = imagecolorallocate($im, 214, 0, 127);
$randcolor[4] = imagecolorallocate($im, 98, 1, 96);
$randcolor[5] = imagecolorallocate($im, 0, 62, 136);
$randcolor[6] = imagecolorallocate($im, 0, 102, 179);
$randcolor[7] = imagecolorallocate($im, 0, 145, 195);
$randcolor[8] = imagecolorallocate($im, 0, 115, 106);
$randcolor[9] = imagecolorallocate($im, 178, 210, 52);
$randcolor[10] = imagecolorallocate($im, 137, 91, 74);
$randcolor[11] = imagecolorallocate($im, 82, 56, 47);

//Setting the darker alt color to the main color
$darkcolor[0] = imagecolorallocate($im, 205, 153, 0);
$darkcolor[1] = imagecolorallocate($im, 170, 51, 0);
$drakcolor[2] = imagecolorallocate($im, 139, 0, 1);
$darkcolor[3] = imagecolorallocate($im, 164, 0, 77);
$darkcolor[4] = imagecolorallocate($im, 48, 0, 46);
$darkcolor[5] = imagecolorallocate($im, 0, 12, 86);
$darkcolor[6] = imagecolorallocate($im, 0, 52, 129);
$darkcolor[7] = imagecolorallocate($im, 0, 95, 145);
$darkcolor[8] = imagecolorallocate($im, 0, 65, 56);
$darkcolor[9] = imagecolorallocate($im, 128, 160, 2);
$darkcolor[10] = imagecolorallocate($im, 87, 41, 24);
$darkcolor[11] = imagecolorallocate($im, 32, 6, 0);

//Getting the data from GET
$i = 0;
while ($i <= 11) {
$data[$i] = $_GET[++$i];
}

//Getting ready
$datasum = array_sum($data);
$anglesum[0] = 0;
$angle[0] = 0;
$i = 0;

//Calc the start and end angle position of the elements
while ($i <= 11) {
    ++$i;
    $n = $i - 1;
    $part[$i] = $data[$n] / $datasum;
    $angle[$i] = floor($part[$i] * 360);
    $anglesum[$i] = array_sum($angle);
}

/*
//DEBUGGING - only for testing purposes
echo "<pre>";
print_r($part);
print_r($anglesum);
print_r($angle);
*/

// make the 3D effect
$n = 0;$i=0;
while ($n <= 11) {
    ++$n;
    $f = $n - 1;
    if ($angle[$n] != 0) {
        for ($i = 110; $i > 100; $i--) {
            imagefilledarc($im, 100, $i, 200, 100, $anglesum[$f], $anglesum[$n], $darkcolor[$f], IMG_ARC_PIE);
        }
    }
}

//make the 2d data that sits above the 3deffect
$i = 0;
while ($i <= 11) {
    ++$i;
    $n = $i - 1;
    if ($angle[$i] != 0) {
       imagefilledarc($im, 100, 100, 200, 100, $anglesum[$n], $anglesum[$i], $randcolor[$n], IMG_ARC_PIE);
    }   
}

// flush image
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

down

-1

t_therkelsen at hotmail dot com ¶

19 years ago


Note that imageFilledArc() and imageArc() both take ints as degree measurements.  This is no problem if you're *only* using imageArc() and/or imageFilledArc().  However, if you're using calculated degrees and plan to superimpose other drawing elements (eg., you want to make vertical lines between the shadow 3D effect) you need to floor() your degrees before converting them to radians, otherwise you'll get precision errors.

A small example illustrating the 'feature'...

<?php
$img = imageCreate(400, 400);
$back = imageColorAllocate($img, 0, 0, 0);
$front = imageColorAllocate($img, 255, 255, 255);

$sd = 45.5;
$ed = 130.5;

imageFilledArc($img, 200, 200, 300, 300, $sd, $ed,
               $front, IMG_ARC_PIE|IMG_ARC_NOFILL|IMG_ARC_EDGED);
imageArc($img, 200, 230, 300, 300, $sd, $ed, $front);

imageLine($img,
          cos(deg2rad($sd))*150+200, sin(deg2rad($sd))*150+200,
          cos(deg2rad($sd))*150+200, sin(deg2rad($sd))*150+230,
          $front);
imageLine($img,
          cos(deg2rad($ed))*150+200, sin(deg2rad($ed))*150+200,
          cos(deg2rad($ed))*150+200, sin(deg2rad($ed))*150+230,
          $front);

header('Content-type: image/png');
imagepng($img);
imagedestroy($img);
?>

And this is how it should be...

<?php
$img = imageCreate(400, 400);
$back = imageColorAllocate($img, 0, 0, 0);
$front = imageColorAllocate($img, 255, 255, 255);

$sd = floor(45.5);
$ed = floor(130.5);

imageFilledArc($img, 200, 200, 300, 300, $sd, $ed,
               $front, IMG_ARC_PIE|IMG_ARC_NOFILL|IMG_ARC_EDGED);
imageArc($img, 200, 230, 300, 300, $sd, $ed, $front);

imageLine($img,
          cos(deg2rad($sd))*150+200, sin(deg2rad($sd))*150+200,
          cos(deg2rad($sd))*150+200, sin(deg2rad($sd))*150+230,
          $front);
imageLine($img,
          cos(deg2rad($ed))*150+200, sin(deg2rad($ed))*150+200,
          cos(deg2rad($ed))*150+200, sin(deg2rad($ed))*150+230,
          $front);

header('Content-type: image/png');
imagepng($img);
imagedestroy($img);
?>

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-1

micha _a.t_ psytrance _d.o.t_ info ¶

20 years ago


for nice colors and adapted shadows from amount of values i try:

<?php
function _errechne_gradzahlen( $werte ) {         /* calc degrees */    
    foreach( $werte as $wert ) { $sum += $wert; }
    foreach( $werte as $wert ) { $gradzahlen[] = 360 * ( $wert / $sum ); }
    return $gradzahlen;
}

function _randomcol ( $im ) {
    return imagecolorallocate( $im, rand(100, 224), rand(100, 224), rand(128, 224) );        
}

$values = array( 100, 200, 50, 100, 43, 32 );    /* the data to display ( real values ) */
$werte = _errechne_gradzahlen( $values );        /* degrees-array */
$width = 200;
$height = 200;
$half_width = floor( $width / 2 );
$half_height = floor($height / 2);

$im = ImageCreateTrueColor( $width, $height );

foreach( $werte as $key => $wert ) {
    /* get colors and shadows */
    $color = _randomcol( $im );                 
    $shadow = $color - 20000;                 // or brighter shadows take 10000
    $colors[] = $color;
    $shadows[] = $shadow;
/* 3D effekt */
     for ($i = ($half_height + 10); $i > $half_height; $i--) {
        imagefilledarc( 
                    $im, 
                    $half_width,  $i,         
                    $width, $half_height,
                    $offset, ($offset + $wert),   // from, to (degrees)
                    $shadows[$key], IMG_ARC_NOFILL);
    }
    $offset = $offset + $wert;
}
$offset = 0;

foreach( $werte as $key => $wert ) {             /* an now draw the top */
    imagefilledarc( 
                $im, 
                $half_width, $half_width, 
                $width, $half_height,           // half sized
                $offset, ($offset + $wert), 
                $colors[$key], IMG_ARC_PIE);
    $offset = $offset + $wert;
}
header( "Content-type: image/png" );
imagepng ( $im );
imagedestroy( $im );
?>

sry for my crab english and the disordered code, i cut and 'translate' it from a class i wrote before.

down

-1

poopie ¶

20 years ago


The examples given so far for drawing a 3D looking pie chart are extremely inefficient and can give a huge performance hit to scripts that draw a lot of pies and in particular those that do offline processing on disk, rather than send a single pie chart to the browser (either way this modification saves you a lot of CPU cycles).

Modify the portion of the code that creates the 3D effect to only draw the outline (with IMG_ARC_NOFILL) of the pie layers below the top filled pie:

// make the 3D effect (modified for the original example)
for ($i = 60; $i >= 50; $i--) {
   imagefilledarc($image, 50, $i, 100, 50, 0, 45, $darknavy, IMG_ARC_NOFILL);
  imagefilledarc($image, 50, $i, 100, 50, 45, 75 , $darkgray, IMG_ARC_NOFILL);
  imagefilledarc($image, 50, $i, 100, 50, 75, 360 , $darkred, IMG_ARC_NOFILL);
}

Note the >= on the for loop, which fills in a gap that is created without the =

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