PHP: imagefilledarc

Description

bool imagefilledarc ( resource image, int cx, int cy, int w, int h, int s, int e, int color, int style )

imagefilledarc() draws a partial ellipse centered at cx, cy (top left is 0, 0) in the image represented by image. Zwraca TRUE w przypadku sukcesu, FALSE w przypadku porażki. W and h specifies the ellipse's width and height respectively while the start and end points are specified in degrees indicated by the s and e arguments. style is a bitwise OR of the following possibilities:

IMG_ARC_PIE
IMG_ARC_CHORD
IMG_ARC_NOFILL
IMG_ARC_EDGED

IMG_ARC_PIE and IMG_ARC_CHORD are mutually exclusive; IMG_ARC_CHORD just connects the starting and ending angles with a straight line, while IMG_ARC_PIE produces a rounded edge. IMG_ARC_NOFILL indicates that the arc or chord should be outlined, not filled. IMG_ARC_EDGED, used together with IMG_ARC_NOFILL, indicates that the beginning and ending angles should be connected to the center - this is a good way to outline (rather than fill) a 'pie slice'.

Przykład 1. Creating a 3D looking pie


<?php



// this example is provided by poxy at klam dot is



// create image

$image = imagecreate(100, 100);



// allocate some solors

$white    = imagecolorallocate($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);



// make the 3D effect

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);





// flush image

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

imagepng($image);

imagedestroy($image);

?>

Notatka: Fa funkcja wymaga GD 2.0.1 lub nowszego.

User Contributed Notes


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);

?>


try this,

<?

$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($i=0;$z<=$sz;$z++){

    for($i=0;$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($i=0;$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);

?>


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]); 

    } 



?>


For 3D-graphs you will want to have a nice shadow. Here is an easy wat to calculate a good matching shadow to a color.

$color is the color for the pie-piece above, $shadow_color is the shadow under it.



<?php



$mask = 0; //0 for darker, 255 for brighter

$percent = 0.70; //between 0.40 (very different) and 0.99 (almost the same)



$R = rand(0, 124); // } between 0,124 if your background color is white

$G = rand(0, 124); // } between 124,255 if your background color is black

$B = rand(0, 124); // } or play with these values



$RS = round($R * $percent) + round($mask * (1-$percent));

$GS = round($G * $percent) + round($mask * (1-$percent));

$BS = round($B * $percent) + round($mask * (1-$percent));



$color = imagecolorallocate( $im, $R, $G, $B);

$shadow_color = imagecolorallocate( $im, $RS, $GS, $BS);



?>


<?

$width = 300;

$height = 200;



$dane[] = 1;

$dane[] = 2;

$dane[] = 3;

$dane[] = 4;

$dane[] = 5;

$dane[] = 6;

$dane[] = 7;

$dane[] = 8;

$dane[] = 9;

$dane[] = 10;

$dane[] = 11;



// Kolory



$image = imageCreate($width, $height);

$background = imageColorAllocate($image, 205, 205, 205);



$kolor[0] = imageColorAllocate($image, 255, 203, 3);

$kolor[1] = imageColorAllocate($image, 220, 101, 29);

$kolor[2] = imageColorAllocate($image, 189, 24, 51);

$kolor[3] = imageColorAllocate($image, 214, 0, 127);

$kolor[4] = imageColorAllocate($image, 98, 1, 96);

$kolor[5] = imageColorAllocate($image, 0, 62, 136);

$kolor[6] = imageColorAllocate($image, 0, 102, 179);

$kolor[7] = imageColorAllocate($image, 0, 145, 195);

$kolor[8] = imageColorAllocate($image, 0, 115, 106);

$kolor[9] = imageColorAllocate($image, 178, 210, 52);

$kolor[10] = imageColorAllocate($image, 137, 91, 74);

$kolor[11] = imageColorAllocate($image, 82, 56, 47);



$cien[0] = imagecolorallocate($image, 205, 153, 0);

$cien[1] = imagecolorallocate($image, 170, 51, 0);

$cien[2] = imagecolorallocate($image, 139, 0, 1);

$cien[3] = imagecolorallocate($image, 164, 0, 77);

$cien[4] = imagecolorallocate($image, 48, 0, 46);

$cien[5] = imagecolorallocate($image, 0, 12, 86);

$cien[6] = imagecolorallocate($image, 0, 52, 129);

$cien[7] = imagecolorallocate($image, 0, 95, 145);

$cien[8] = imagecolorallocate($image, 0, 65, 56);

$cien[9] = imagecolorallocate($image, 128, 160, 2);

$cien[10] = imagecolorallocate($image, 87, 41, 24);

$cien[11] = imagecolorallocate($image, 32, 6, 0);



// Oblicznia



$suma = array_sum($dane);



$stopnie = 0;

for($i = 0; $i < count($dane); $i++){

    $start[$i]= $stopnie;

    $stop[$i] = $stopnie + round(($dane[$i] / $suma) * 360, 0);

    $stopnie = $stop[$i];

}



$x = $width / 2;

$size = $width / 10;

$y = $height / 2 - $size / 2 - 1;



// Wyswietlanie

for($g = $size; $g > 0; $g--){

    for($n = 0; $n < count($dane); $n++){

        imagefilledarc($image, $x, $y+$g, $width, $height - $size, $start[$n], $stop[$n], $cien[$n], IMG_ARC_PIE);

    }

}



for($i = 0; $i < count($dane); $i++){

    imagefilledarc($image, $x, $y, $width, $height - $size, $start[$i], $stop[$i], $kolor[$i], IMG_ARC_PIE);



}



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

imagePNG($image);

imageDestroy($image);

?>


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);

?>