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Draws an arc
(PHP 4, PHP 5)
Example 986. Drawing a circle with imagearc()<?phpThe above example will output something similar to:  Related Examples ( Source code ) » imagearc Examples ( Source code ) » Drawing a Circle Examples ( Source code ) » Drawing a Circle with imagearc() Examples ( Source code ) » Color Examples ( Source code ) » Round rectangle Demo Code Examples / Notes » imagearcjerryscript
[note-Apache/1.3.29 (Win32) PHP/4.3.4] The imagearc (and imageellipse) functions do not accept line thicknesses when drawn from 0 to 360 degrees. Drawing from 0 to 359 and again from 359 to 360 does create an ellipse with the current line thickness. Jerry foripepe
To fill an arc (DiameterX != DiameterY): <? function imagefilledarc($Image, $CenterX, $CenterY, $DiameterX, $DiameterY, $Start, $End, $Color) { // To draw the arc imagearc($Image, $CenterX, $CenterY, $DiameterX, $DiameterY, $Start, $End, $Color); // To close the arc with 2 lines between the center and the 2 limits of the arc $x = $CenterX + (cos(deg2rad($Start))*($DiameterX/2)); $y = $CenterY + (sin(deg2rad($Start))*($DiameterY/2)); imageline($Image, $x, $y, $CenterX, $CenterY, $Color); $x = $CenterX + (cos(deg2rad($End))*($DiameterX/2)); $y = $CenterY + (sin(deg2rad($End))*($DiameterY/2)); imageline($Image, $x, $y, $CenterX, $CenterY, $Color); // To fill the arc, the starting point is a point in the middle of the closed space $x = $CenterX + (cos(deg2rad(($Start+$End)/2))*($DiameterX/4)); $y = $CenterY + (sin(deg2rad(($Start+$End)/2))*($DiameterY/4)); imagefilltoborder($Image, $x, $y, $Color, $Color); } ?> To close the arc with 2 lines (DiameterX != DiameterY): <? function imagenofilledarc($Image, $CenterX, $CenterY, $DiameterX, $DiameterY, $Start, $End, $Color) { // To draw the arc imagearc($Image, $CenterX, $CenterY, $DiameterX, $DiameterY, $Start, $End, $Color); // To close the arc with 2 lines between the center and the 2 limits of the arc $x = $CenterX + (cos(deg2rad($Start))*($DiameterX/2)); $y = $CenterY + (sin(deg2rad($Start))*($DiameterY/2)); imageline($Image, $x, $y, $CenterX, $CenterY, $Color); $x = $CenterX + (cos(deg2rad($End))*($DiameterX/2)); $y = $CenterY + (sin(deg2rad($End))*($DiameterY/2)); imageline($Image, $x, $y, $CenterX, $CenterY, $Color); } ?> An example: <? $destImage = imagecreate( 216, 152 ); $c0 = imagecolorallocate( $destImage, 0, 255, 255 ); $c1 = imagecolorallocate( $destImage, 0, 0, 0 ); $c2 = imagecolorallocate( $destImage, 255, 0, 0 ); ImageFilledRectangle ( $destImage, 0, 0, 216, 152, $c0 ); imagefilledarc( $destImage, 108, 76, 180, 80, 0, 130, $c1 ); imagenofilledarc( $destImage, 108, 76, 180, 80, 0, 130, $c2 ); header("content-type: image/PNG"); ImagePNG( $destImage ); ImageDestroy( $destImage ); ?> timothyhouck
To do filled arcs, try something like this: $diameter = 50; imagearc($image, 25, 25, $diameter, $diameter, $start, $end, $color); while($diameter > 0) { imagearc($image, 25, 25, $diameter, $diameter, $start, $start + 1, $color); imagearc($image, 25, 25, $diameter, $diameter, $end - 1, $end, $color); $diameter--; } ...well you get the point. It's a kludge, and *very* slow, but it's free. ruturaj_v
this is another piechart eg. very simple ... <?php global $deg; function get_polar($xrel, $yrel, $ang, $radius) { $i = $ang; $ang = ($ang * pi())/ 180; $ix = abs($radius*cos($ang)); $iy = abs($radius*sin($ang)); if ($i>=0 && $i<=90) { $ix = $xrel + $ix; $iy = $yrel - $iy; } if ($i>90 && $i<=180) { $ix = $xrel - $ix; $iy = $yrel - $iy; } if ($i>180 && $i<=270) { $ix = $xrel - $ix; $iy = $yrel + $iy; } if ($i>270 && $i<=360) { $ix = $xrel + $ix; $iy = $yrel + $iy; } $ix = floor($ix); $iy = floor($iy); //echo ($ix . " $iy "); $returnvals = array ( 'x1' => $xrel, 'y1' => $yrel, 'x2' => $ix, 'y2' => $iy ); return $returnvals; } function get_degtotal($degindex) { global $deg; if ($degindex == 0 ) { return ( $deg[$degindex] ); } else { return ( $deg[$degindex] + get_degtotal($degindex-1) ); } } $im = imagecreate (400, 400); $w = imagecolorallocate ($im, 255, 255, 255); $black = imagecolorallocate ($im, 0, 0, 0); $red = imagecolorallocate ($im, 255, 0, 0); $green = imagecolorallocate ($im, 0, 180, 0); $randcolor[0] = imagecolorallocate($im, 243, 54, 163); $randcolor[1] = imagecolorallocate($im, 179, 51, 247); $randcolor[2] = imagecolorallocate($im, 103, 48, 250); $randcolor[3] = imagecolorallocate($im, 53, 145, 244); $randcolor[4] = imagecolorallocate($im, 54, 243, 243); $randcolor[5] = imagecolorallocate($im, 107, 245, 180); $randcolor[6] = imagecolorallocate($im, 203, 242, 111); $randcolor[7] = imagecolorallocate($im, 248, 201, 105); $data[0] = 30; $data[1] = 20; $data[2] = 15; $data[3] = 10; $data[4] = 8; $data[5] = 7; $data[6] = 5; $data[7] = 5; $datasum = array_sum($data); $deg[0] = number_format((30 / $datasum * 360), 2, ".", ""); $deg[1] = number_format((20 / $datasum * 360), 2, ".", ""); $deg[2] = number_format((15 / $datasum * 360), 2, ".", ""); $deg[3] = number_format((10 / $datasum * 360), 2, ".", ""); $deg[4] = number_format((8 / $datasum * 360), 2, ".", ""); $deg[5] = number_format((7 / $datasum * 360), 2, ".", ""); $deg[6] = number_format((5 / $datasum * 360), 2, ".", ""); $deg[7] = number_format((5 / $datasum * 360), 2, ".", ""); echo ('<pre>'); //print_r($deg); $datadeg = array(); $datapol = array(); $degbetween = array(); $databetweenpol = array(); for ($i=0; $i < count($deg) ; $i++) { $datadeg[$i] = get_degtotal($i); $datapol[$i] = get_polar(200, 200, $datadeg[$i], 100); } for ($i=0; $i < count($datadeg) ; $i++) { /*this is a trick where you take 2deg angle before and get the smaller radius so that you can have a pt to `imagefill` the chartboundary */ $degbetween[$i] = ($datadeg[$i]-2); $databetweenpol[$i] = get_polar(200, 200, $degbetween[$i], 50); } print_r($datadeg); print_r($degbetween); print_r($databetweenpol); //exit; for ($i=0; $i<count($deg); $i++) { imageline ($im, 200, 200, $datapol[$i]['x2'], $datapol[$i]['y2'], $black); } imagearc($im, 200, 200, 200, 200, 0, 360, $black); for ($i=0; $i<count($deg); $i++) { imagefill ($im, $databetweenpol[$i]['x2'], $databetweenpol[$i]['y2'], $randcolor[$i]); } //header ("Content-type: image/png"); imagepng($im, 'piechart.png'); ?> <img src='piechart.png'> cbriou
There is another way to fill an arc : // To draw the arc $Color = imagecolorallocate($Image, $Red, $Green, $Blue); imagearc($Image, $CenterX, $CenterY, $Diameter, $Diameter, $Start, $End, $Color); // To close the arc with 2 lines between the center and the 2 limits of the arc $x = $CenterX + (cos(deg2rad($Start))*($Diameter/2)); $y = $CenterY + (sin(deg2rad($Start))*($Diameter/2)); imageline($Image, $x, $y, $CenterX, $CenterY, $Color); $x = $CenterX + (cos(deg2rad($End))*($Diameter/2)); $y = $CenterY + (sin(deg2rad($End))*($Diameter/2)); imageline($Image, $x, $y, $CenterX, $CenterY, $Color); // To fill the arc, the starting point is a point in the middle of the closed space $x = $CenterX + (cos(deg2rad(($Start+$End)/2))*($Diameter/4)); $y = $CenterY + (sin(deg2rad(($Start+$End)/2))*($Diameter/4)); imagefilltoborder($Image, $x, $y, $Color, $Color); travis
The wierd thing is that the first two integers tell where to place the "circle". So for example I first create the "pallet" to place the circle on. $image = imagecreate(500, 500); (this makes a huge 500x500 gif :) ) $colorBody = imagecolorallocate($image, 0, 0, 0); (make the default color of the "pallet" black $circleColor = imagecolorallocate($image, 255, 0, 255); (going to make the circle an ugly pink color) imagearc($image, 250, 250, 300, 300, 0, 360, $circleColor); Places the image in the center (250,250) and the circle is 300 pixels in diameter. Hope this helps. Travis Kent Beste 09-apr-2001 06:37
The following site contains heaps of different functions to draw graphs with easy to follow code for newbies and heaps of examples with OVER 60 different predefined graphs http://www.aditus.nu/jpgraph/index.php marc
Round cornered anti-aliased dynamically sized button. $w=40; $h=20; $im = ImageCreate($w,$h); $white=ImageColorAllocate($im,255,255,255); ImageFilledRectangle($im,0,0,$w,$h,$white); imagecolortransparent ($im, $white); ImageTTFText ($im, $h+ceil($h/3)+1, 0, -1, $h-1, $col1, "arialbd.ttf", "O"); ImageTTFText ($im, $h+ceil($h/3)+1, 0, $w-$h, $h-1, $col1, "arialbd.ttf", "O"); ImageTTFText ($im, $h+ceil($h/3)+1, 0, 1, $h-1, $col1, "arialbd.ttf", "O"); ImageTTFText ($im, $h+ceil($h/3)+1, 0, $w-$h-2, $h-1, $col1, "arialbd.ttf", "O"); $points=array( 1,round($h/2), round($h/4),$h-round($h/4), round($h/2),$h, $w-(round($h/2)),$h, $w-(round($h/4)),$h-round($h/4), $w-2,round($h/2), $w-round($h/4),round($h/4), $w-round($h/2),0, round($h/2),0, round($h/4),round($h/4) ); imagefilledpolygon ($im, $points, 10, $col1); header("content-type: image/gif"); header("Content-Disposition: filename=name.gif"); ImageGif($im); ImageDestroy($im); eamon
Right... possibly the easiest way of drawing a filled circle: Loop through the imagearc function incrementing the diameter by one pixel: <? // --- code fragment --- // for($i=1; $i<$Diameter; $i++){ imagearc($Image, $CenterX, $CenterY, $i, $i, $Start, $End, $Color); } // --------------------- // ?> This works great for circles with diameters up to about 60 or 70 pixels wide. After that, you start to get pixle gaps. 23-jan-2003 04:55
Please note that in order to draw a complete circle or ellipse (without using the imageellipse) you mustn't use 0° for both s and e. If you do this you will get, umm, nothing. Instead set s to 0° and e to 360° to get a complete circle or ellipse.
jinny
imagesetstyle() sets the style to be used by all line drawing functions when drawing with the special color . Here goes a example of drawing a dashed-line circle.enjoy! <?php header("Content-type: image/jpeg"); $im = imagecreate(100,100); $b = imagecolorallocate ($im, 0, 0, 0); $w = imagecolorallocate ($im, 255, 255, 255); $style = array ($b,$b,$b,$b,$b,$w,$w,$w,$w,$w); imagesetstyle ($im, $style); imagearc($im,50,50,100,100,0,360,IMG_COLOR_STYLED); imagejpeg($im); imagedestroy($im); ?> ericquil
If circles overlap, a temporary border is needed when filling: ImageArc ($im,$x,$y,$w,$h,0,360,$temp_color); ImageFillToBorder($im,$x,$y,$temp_color,$fill_color); ImageArc ($im,$x,$y,$w,$h,0,360,$fill_color); arve
I found a better way for drawing a pie chart: header ("Content-type: image/png"); $diameter = 100; $radius = $diameter / 2; $centerX = $radius; $centerY = $radius; $im = @ImageCreate ($diameter, $diameter) or die ("Cannot Initialize new GD image stream"); $background = ImageColorAllocate ($im, 0, 0, 0); $red = ImageColorAllocate ($im, 176, 0, 0); function fill_arc($start, $end, $color) { global $diameter, $centerX, $centerY, $im, $radius; imagearc($im, $centerX, $centerY, $diameter, $diameter, $start, $end, $color); imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($start)) * $radius, $centerY + sin(deg2rad($start)) * $radius, $color); imageline($im, $centerX, $centerY, $centerX + cos(deg2rad($end)) * $radius, $centerY + sin(deg2rad($end)) * $radius, $color); imagefill ($im,$centerX + $radius * 0.5 *cos(deg2rad($start+($end-$start)/2)), $centerY + $radius * 0.5 * sin(deg2rad($start+($end-$start)/2)), $color); } fill_arc(0,30,$red); // Will make a red filled arc, starting at 0 degrees, ending at 30 degrees ImagePng ($im); logang
Heres a function to make a curve between two points... This will be a downward curve but it wouldn't be hard to make a similar function to make an upward curve. The first point has to be to the left of the second point ($x1 < $x2), and height is actually backwards. The larger height is the less of a crest the curve has. I imagine with a few modifications this functions could make upward curves as well. function ImageCurveDown ($image, $x1, $y1, $x2, $y2, $height, $color) { $presicion = 1; for ($left = ($x1-$x2); $left < 0; $left++){ if ($y1 < $y2) { $cy = $y2 + $height; $cx = $x1 - $left; } else { $cy = $y1 + $height; $cx = $x2 + $left; } $nx1 = abs($x1 - $cx); $ny1 = abs($y1 - $cy); $nx2 = abs($x2 - $cx); $ny2 = abs($y2 - $cy); if ($y1 < $y2) { if ($nx2 == 0 || $ny1 == 0) continue; $angle1 = atan($height/$nx2); $A1 = $nx2/cos ($angle1); $B1 = $ny2/sin ($angle1); $angle2 = pi()/2 +atan($left/$ny1); $A2 = $nx1/cos ($angle2); $B2 = $ny1/sin ($angle2); } else { if ($ny2 == 0 || $nx1 == 0) continue; $angle1 = atan($ny2/$nx2); $A1 = abs($nx2/cos ($angle1)); $B1 = abs($ny2/sin ($angle1)); $angle2 = atan($height/$nx1); $A2 = abs ($nx1/cos ($angle2)); $B2 = abs($ny1/sin ($angle2)); } if (abs($A1 - $A2) < $presicion && abs ($B1 - $B2) < $presicion) { ImageArc($image, $cx, $cy, $A1*2, $B1*2, 180+rad2deg($angle2), 360-rad2deg($angle1), $color); } } } nojer2
Here's the function to draw rotated ellipses again. This time I've optimised it a bit, fixed the no-fill bug, and used a 'squishratio' rather than a 'radiusmodifier', to make the curves perfect, so ignore my previous version. function rotatedellipse($im, $cx, $cy, $width, $height, $rotateangle, $colour, $filled=true) { $step=2; $cosangle=cos(deg2rad($rotateangle)); $sinangle=sin(deg2rad($rotateangle)); $squishratio = $height/$width; $nopreviouspoint = true; for ($angle=0; $angle<=(180+$step); $angle+=$step) { $ox = ($width * cos(deg2rad($angle))); $oy = ($width * sin(deg2rad($angle))) * $squishratio; $x = + (($ox * $cosangle) - ($oy * $sinangle)); $y = $centrey + (($ox * $sinangle) + ($oy * $cosangle)); if ($nopreviouspoint) { $px=$x; $py=$y; $nopreviouspoint=false; } if ($filled) { triangle($im, $cx, $cy, $cx+$px, $cy+$py, $cx+$x, $cy+$y, $colour); triangle($im, $cx, $cy, $cx-$px, $cx-$py, $cx-$x, $cy-$y, $colour); } else { imageline($im, $cx+$px, $cy+$py, $cx+$x, $cy+$y, $colour); imageline($im, $cx-$px, $cx-$py, $cx-$x, $cy-$y, $colour); } $px=$x; $py=$y; } } function triangle($im, $x1,$y1, $x2,$y2, $x3,$y3, $colour) { $coords = array($x1,$y1, $x2,$y2, $x3,$y3); imagefilledpolygon($im, $coords, 3, $colour); } mojiro
A previous for the Rotated (Filled)Ellipse note from(nojer2 at yahoo dot com, 02-Apr-2001 12:06) has a mistake, at the second arc. Replace them with the following listing. if ($filled) { triangle($im, $cx, $cy, $cx+$px, $cy+$py, $cx+$x, $cy+$y, $colour); triangle($im, $cx, $cy, $cx-$px, $cy-$py, $cx-$x, $cy-$y, $colour); } else { imageline($im, $cx+$px, $cy+$py, $cx+$x, $cy+$y, $colour); imageline($im, $cx-$px, $cy-$py, $cx-$x, $cy-$y, $colour); } |
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gd_info getimagesize image_type_to_extension image_type_to_mime_type image2wbmp imagealphablending imageantialias imagearc imagechar imagecharup imagecolorallocate imagecolorallocatealpha imagecolorat imagecolorclosest imagecolorclosestalpha imagecolorclosesthwb imagecolordeallocate imagecolorexact imagecolorexactalpha imagecolormatch imagecolorresolve imagecolorresolvealpha imagecolorset imagecolorsforindex imagecolorstotal imagecolortransparent imageconvolution imagecopy imagecopymerge imagecopymergegray imagecopyresampled imagecopyresized imagecreate imagecreatefromgd2 imagecreatefromgd2part imagecreatefromgd imagecreatefromgif imagecreatefromjpeg imagecreatefrompng imagecreatefromstring imagecreatefromwbmp imagecreatefromxbm imagecreatefromxpm imagecreatetruecolor imagedashedline imagedestroy imageellipse imagefill imagefilledarc imagefilledellipse imagefilledpolygon imagefilledrectangle imagefilltoborder imagefilter imagefontheight imagefontwidth imageftbbox imagefttext imagegammacorrect imagegd2 imagegd imagegif imagegrabscreen imagegrabwindow imageinterlace imageistruecolor imagejpeg imagelayereffect imageline imageloadfont imagepalettecopy imagepng imagepolygon imagepsbbox imagepsencodefont imagepsextendfont imagepsfreefont imagepsloadfont imagepsslantfont imagepstext imagerectangle imagerotate imagesavealpha imagesetbrush imagesetpixel imagesetstyle imagesetthickness imagesettile imagestring imagestringup imagesx imagesy imagetruecolortopalette imagettfbbox imagettftext imagetypes imagewbmp imagexbm iptcembed iptcparse jpeg2wbmp png2wbmp |
