/**
* Render the horizontal axis
*
* @param RenderContext $ctx The context to use for rendering
* @param DOMElement $group The DOMElement this axis will be added to
*/
private function renderHorizontalAxis(RenderContext $ctx, DOMElement $group)
{
$steps = $this->ticksPerX($this->xUnit->getTicks(), $ctx->getNrOfUnitsX(), $this->minUnitsPerStep);
$ticks = $this->ticksPerX($this->xUnit->getTicks(), $ctx->getNrOfUnitsX(), $this->minUnitsPerTick);
// Steps should always be ticks
if ($ticks !== $steps) {
$steps = $ticks * 5;
}
// Check whether there is enough room for regular labels
$labelRotationStyle = $this->labelRotationStyle;
if ($this->labelsOversized($this->xUnit, 6)) {
$labelRotationStyle = self::LABEL_ROTATE_DIAGONAL;
}
/*
$line = new Line(0, 100, 100, 100);
$line->setStrokeWidth(2);
$group->appendChild($line->toSvg($ctx));
*/
// contains the approximate end position of the last label
$lastLabelEnd = -1;
$shift = 0;
$i = 0;
foreach ($this->xUnit as $label => $pos) {
if ($i % $ticks === 0) {
/*
$tick = new Line($pos, 100, $pos, 101);
$group->appendChild($tick->toSvg($ctx));
*/
}
if ($i % $steps === 0) {
if ($labelRotationStyle === self::LABEL_ROTATE_HORIZONTAL) {
// If the last label would overlap this label we shift the y axis a bit
if ($lastLabelEnd > $pos) {
$shift = ($shift + 5) % 10;
} else {
$shift = 0;
}
}
$labelField = new Text($pos + 0.5, ($this->xLabel ? 107 : 105) + $shift, $label);
if ($labelRotationStyle === self::LABEL_ROTATE_HORIZONTAL) {
$labelField->setAlignment(Text::ALIGN_MIDDLE)->setFontSize('2.5em');
} else {
$labelField->setFontSize('2.5em');
}
if ($labelRotationStyle === self::LABEL_ROTATE_DIAGONAL) {
$labelField = new Rotator($labelField, 45);
}
$labelField = $labelField->toSvg($ctx);
$group->appendChild($labelField);
if ($this->drawYGrid) {
$bgLine = new Line($pos, 0, $pos, 100);
$bgLine->setStrokeWidth(0.5)->setStrokeColor('#BFBFBF');
$group->appendChild($bgLine->toSvg($ctx));
}
$lastLabelEnd = $pos + strlen($label) * 1.2;
}
$i++;
}
}
