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Lucas Woltmann 2014-07-08 20:14:37 +02:00
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<?php
//============================================================================
// Name : chartLib.php
// Author : Lucas Woltmann
// Version : 1.0
// Date : 08-2013
// Description : Provides functions for creating beautiful and astonishing charts
//============================================================================
function DrawCoords($image, $XLength, $YLength, $values)
{
$width = ImageSX($image);
$height = ImageSY($image);
//scale offset for each axis, minimize Xoffset for small values of Xlength
$Xoffset = 0.8*($width/$XLength);
$Yoffset = 0.8*($height/$YLength);
if($Xoffset>150)
{
$Xoffset=$Xoffset/10;
}
//lines out of image
if($width < ($XLength * $Xoffset) || $height < ($YLength * $Yoffset))
{
echo "lines out of boundaries";
}
$black = ImageColorAllocate($image, 0, 0, 0);
$left = ($width - $XLength * $Xoffset)/2;
$right = $width-$left;
$upper = ($YLength * $Yoffset)+$Yoffset;
$YSpace = ($upper - $Yoffset)/$YLength;
$XSpace = ($right - $left)/$XLength;
//draws X-Axis
ImageLine($image, $left, $upper, $right, $upper, $black);
//draws y-Axis with Yoffset as upper margin
ImageLine($image, $left, $upper,$left, $Yoffset,$black);
//draws arrows
ImageLine($image, $right-5, $upper-5,$right,$upper,$black);
ImageLine($image, $right-5, $upper+5,$right,$upper,$black);
ImageLine($image, $left, $Yoffset,$left+5,$Yoffset+5,$black);
ImageLine($image, $left, $Yoffset,$left-5,$Yoffset+5,$black);
//draws lines for measurement at the y-Axis
for($i=1;$i<$YLength;$i++)
{
ImageLine($image, $left-4, $upper-$YSpace*$i ,$left+4, $upper-$YSpace*$i,$black);
}
//same for the x-Axis
for($j=1;$j<$XLength;$j++)
{
ImageLine($image, $left+$XSpace*$j, $upper-4 ,$left+$XSpace*$j, $upper+4,$black);
}
//caption for x-Axis
$index=0;
while($index < $XLength)
{
if($index % 5 == 0)
{
ImageString($image, 4, $left+($XSpace*$index)-($Xoffset/4), $upper+($Yoffset/3), $index, $black);
}
$index++;
}
//caption for y-Axis
$index=0;
while($index < count($values))
{
ImageString($image, 4, $left-(0*$Xoffset+30), $upper-$YSpace*$index-($Yoffset*0.7), $values[$index], $black);
$index++;
}
}
function DrawBar($image, $length, $maxOfX ,$position, $maxOfY, $value, $color)
{
$imgWidth = ImageSX($image);
$imgHeight = ImageSY($image);
//scale offset for each axis and minimize Xoffset for small values of maxOfX
$Xoffset = 0.8*($imgWidth/$maxOfX);
$Yoffset = 0.8*($imgHeight/$maxOfY);
if($Xoffset>150)
{
$Xoffset=$Xoffset/10;
}
$length = $length*$Xoffset;
$black = ImageColorAllocate($image, 0, 0, 0);
$left = ($imgWidth - $maxOfX * $Xoffset)/2;
$upper = /*($maxOfY*$Yoffset) +*/ $Yoffset + ($position*$Yoffset);
$right = $left+$length;
ImageFilledRectangle($image, $left, $upper, $right, $upper-$Yoffset, $color);
ImageString($image, 4, $right+($Xoffset/3), $upper-$Yoffset*0.7, $value, $black);
}
function CreateImage($width, $height)
{
$image = ImageCreate($width, $height);
$white = ImageColorAllocateAlpha($image, 255, 255, 255, 127);
ImageFill($image, 0, 0, $white);
ImageSaveAlpha($image, TRUE);
return $image;
}
?>