function plotPoints(&$im, $w, $h, $startPadding, $endPadding, $yAxis, $minY, $maxY, $xDivisions, $yDivisions, $lineColor, $xAxisEndPadding)
{
$x1 = $startPadding;
$xMod = ($w - $xAxisEndPadding - $startPadding) / $xDivisions;
for ($i = 0; $i < count($yAxis); $i++) {
$y1 = $h - $startPadding - ($h - 2 * $startPadding) * ($yAxis[$i] - $minY) / ($maxY - $minY);
drawPoint($im, $x1, $y1, $lineColor);
if ($i + 1 < count($yAxis)) {
$x2 = $x1 + $xMod;
$y2 = $h - $startPadding - ($h - 2 * $startPadding) * ($yAxis[$i + 1] - $minY) / ($maxY - $minY);
drawLine($im, $x1, $y1, $x2, $y2, $lineColor);
}
$x1 += $xMod;
}
}
<?php
class notGpsCoord extends Exception
{
}
class outOfBoundsCoord extends Exception
{
}
function drawPoint($p)
{
if (is_string($p)) {
throw new notGpsCoord("Invalid GPS coord. Must be number.\n");
}
if ($p > 100000) {
throw new outOfBoundsCoord("Invalid GPS coord. Too great.\n");
}
}
try {
//drawPoint(100001);
drawPoint('foo');
} catch (notGpsCoord $e) {
echo $e->getMessage();
} catch (outOfBoundsCoord $e) {
echo $e->getMessage();
}
