protected function drawProfile($profile, $width, $height)
{
$margint = 50;
$marginr = 50;
$marginb = 50;
$marginl = 50;
$last = end($profile);
$maxdist = $last[0];
$minalti = array(array(0, INF));
$maxalti = array(array(0, -INF));
foreach ($profile as $coords) {
$alti = $coords[1];
if ($alti == $minalti[0][1]) {
$minalti[] = array($coords[0], $alti);
} else {
if ($alti < $minalti[0][1]) {
$minalti = array(array($coords[0], $alti));
}
}
if ($alti == $maxalti[0][1]) {
$maxalti[] = array($coords[0], $alti);
} else {
if ($alti > $maxalti[0][1]) {
$maxalti = array(array($coords[0], $alti));
}
}
}
$canvas = new Canvas($width, $height, $margint, $marginr, $marginb, $marginl);
$canvas->setViewBox(0, $minalti[0][1], $maxdist, $maxalti[0][1]);
$canvas->rect(0, 0, $width, $height, "FFFFFF");
$slopecolor = function ($slope) {
if ($slope > 18) {
return "FF0000";
// red
} else {
if ($slope > 12) {
return "FF4000";
} else {
if ($slope > 7) {
return "FF8000";
} else {
if ($slope > 3) {
return "FFC000";
} else {
if ($slope > 0) {
return "FFFF00";
// yellow
} else {
if ($slope > -3) {
return "00FFFF";
} else {
if ($slope > -7) {
return "00C0FF";
} else {
if ($slope > -12) {
return "0080FF";
} else {
if ($slope > -18) {
return "0040FF";
} else {
return "0000FF";
// blue;
}
}
}
}
}
}
}
}
}
};
$canvas->setThickness(2);
$prev = null;
foreach ($profile as $coord) {
if (!is_null($prev)) {
$dist = $coord[0];
$alti = $coord[1];
$prevdist = $prev[0];
$prevalti = $prev[1];
$slope = 100 * ($alti - $prevalti) / ($dist - $prevdist);
$canvas->line($canvas->canvasXPos($prevdist), $canvas->canvasYPos($prevalti), $canvas->canvasXPos($dist), $canvas->canvasYPos($alti), $slopecolor($slope), true);
}
$prev = $coord;
}
$canvas->setThickness(1);
$canvas->setFont(APPLICATION_PATH . '/resources/' . 'DejaVuSans.ttf', 10);
list($minx, $miny, $maxx, $maxy) = $canvas->getViewBox();
$deltax = pow(10, floor(log10($maxx - $minx)));
foreach (range($minx, $maxx, $deltax) as $x) {
$canvas->line($canvas->canvasXPos($x), $height - $marginb + 10, $canvas->canvasXPos($x), $height - $marginb, "000000");
if ($deltax < 1000) {
$text = $x . "m";
} else {
$text = round($x / 1000) . "km";
}
$canvas->text($canvas->canvasXPos($x), $height - $marginb + 10 + 3, $text, "000000", "cb");
}
$canvas->line($marginl, $height - $marginb, $width - $marginr, $height - $marginb, "000000");
$deltay = pow(10, floor(log10($maxy - $miny)));
foreach (range($miny, $maxy, $deltay) as $y) {
$canvas->line($marginl - 10, $canvas->canvasYPos($y), $marginl, $canvas->canvasYPos($y), "000000");
$text = $y . "m";
$canvas->text($marginl - 10 - 3, $canvas->canvasYPos($y), $text, "000000", "rc");
}
$canvas->line($marginl, $height - $marginb, $marginr, $margint, "000000");
list($minx, $miny, $maxx, $maxy) = $canvas->getViewBox();
$limits = array($canvas->canvasYPos($maxy) + 3, $canvas->canvasXPos($maxx) - 3, $canvas->canvasYPos($miny) - 3, $canvas->canvasXPos($minx) + 3);
$prev = null;
foreach ($minalti as $coords) {
list($dist, $alti) = $coords;
if (!is_null($prev)) {
$xdist = $canvas->canvasXPos($dist) - $canvas->canvasXPos($prev[0]);
/* second label would be less than 10px from previous one. Do
not display it */
if ($xdist < 10) {
continue;
}
}
$text = round($alti) . "m";
$xpos = $canvas->canvasXPos($dist);
$ypos = $canvas->canvasYPos($alti);
$canvas->text($xpos, $ypos + 5, $text, "000000", "cb", $limits);
$canvas->rect($xpos - 1, $ypos - 1, $xpos + 1, $ypos + 1, "000000");
$prev = $coords;
}
$prev = null;
foreach ($maxalti as $coords) {
list($dist, $alti) = $coords;
if (!is_null($prev)) {
$xdist = $canvas->canvasXPos($dist) - $canvas->canvasXPos($prev[0]);
/* second label would be less than 10px from previous one. Do
not display it */
if ($xdist < 10) {
continue;
}
}
$text = round($alti) . "m";
$xpos = $canvas->canvasXPos($dist);
$ypos = $canvas->canvasYPos($alti);
$canvas->text($xpos, $ypos - 5, $text, "000000", "ct", $limits);
$canvas->rect($xpos - 1, $ypos - 1, $xpos + 1, $ypos + 1, "000000");
$prev = $coords;
}
return $canvas;
}