private function drawFilledTriangleHorizontally(awGradient $gradient, awPolygon $polygon)
{
list($xMin, $xMax) = $polygon->getBoxXRange();
$this->init($gradient, $xMax - $xMin);
// Get the triangle line we will draw our lines from
$fromLine = NULL;
$lines = $polygon->getLines();
$count = count($lines);
// Pick the side of the triangle going all the way
// from the left side to the right side of the surrounding box
for ($i = 0; $i < $count; $i++) {
if ($lines[$i]->isLeftToRight($polygon)) {
list($fromLine) = array_splice($lines, $i, 1);
break;
}
}
// If for some reason the three points are aligned,
// $fromLine will still be NULL
if ($fromLine === NULL) {
return;
}
$fillLine = NULL;
for ($x = round($xMin); $x < round($xMax); $x++) {
$fromY = floor($fromLine->getYFrom($x));
$toY = array();
foreach ($lines as $line) {
$yValue = $line->getYFrom($x);
if (!is_null($yValue)) {
$toY[] = floor($yValue);
}
}
if (count($toY) === 1) {
$fillLine = new Line(new Point($x, $fromY), new Point($x, $toY[0]));
} else {
$line1 = new Line(new Point($x, $fromY), new Point($x, $toY[0]));
$line2 = new Line(new Point($x, $fromY), new Point($x, $toY[1]));
if ($line1->getSize() < $line2->getSize()) {
$fillLine = $line1;
} else {
$fillLine = $line2;
}
}
$color = $this->color($x - $xMin);
if ($fillLine->isPoint()) {
$this->driver->point($color, $fillLine->p1);
} elseif ($fillLine->getSize() >= 1) {
$this->driver->line($color, $fillLine);
}
unset($color);
}
}
