/**
* Render the legend to an SVG object
*
* @param RenderContext $ctx The context to use for rendering this legend
*
* @return DOMElement The SVG representation of this legend
*/
public function toSvg(RenderContext $ctx)
{
$outer = new Canvas('legend', new LayoutBox(0, 0, 100, 100));
$outer->getLayout()->setPadding(2, 2, 2, 2);
$nrOfColumns = 4;
$topstep = 10 / $nrOfColumns + 2;
$top = 0;
$left = 0;
$lastLabelEndPos = -1;
foreach ($this->dataset as $color => $text) {
$leftstep = 100 / $nrOfColumns + strlen($text);
// Make sure labels don't overlap each other
while ($lastLabelEndPos >= $left) {
$left += $leftstep;
}
// When a label is longer than the available space, use the next line
if ($left + strlen($text) > 100) {
$top += $topstep;
$left = 0;
}
$colorBox = new Rect($left, $top, 2, 2);
$colorBox->setFill($color)->setStrokeWidth(2);
$colorBox->keepRatio();
$outer->addElement($colorBox);
$textBox = new Text($left + 5, $top + 2, $text);
$textBox->setFontSize('2em');
$outer->addElement($textBox);
// readjust layout
$lastLabelEndPos = $left + strlen($text);
$left += $leftstep;
}
$svg = $outer->toSvg($ctx);
return $svg;
}
/**
* Render the vertical axis
*
* @param RenderContext $ctx The context to use for rendering
* @param DOMElement $group The DOMElement this axis will be added to
*/
private function renderVerticalAxis(RenderContext $ctx, DOMElement $group)
{
$line = new Line(0, 0, 0, 100);
$line->setStrokeWidth(2);
$group->appendChild($line->toSvg($ctx));
foreach ($this->yUnit as $label => $pos) {
$pos = 100 - $pos;
$tick = new Line(0, $pos, -1, $pos);
$group->appendChild($tick->toSvg($ctx));
$labelField = new Text(-0.5, $pos + 0.5, $label);
$labelField->setFontSize('1.8em')->setAlignment(Text::ALIGN_END);
$group->appendChild($labelField->toSvg($ctx));
if ($this->drawXGrid) {
$bgLine = new Line(0, $pos, 100, $pos);
$bgLine->setStrokeWidth(0.5)->setStrokeColor('#343');
$group->appendChild($bgLine->toSvg($ctx));
}
}
if ($this->yLabel) {
$axisLabel = new Text(-8, 50, $this->yLabel);
$axisLabel->setFontSize('2em')->setAdditionalStyle(Text::ORIENTATION_VERTICAL)->setFontWeight('bold')->setAlignment(Text::ALIGN_MIDDLE);
$group->appendChild($axisLabel->toSvg($ctx));
}
}
/**
* Draw the label handler and the text for this pie slice
*
* @param RenderContext $ctx The rendering context to use for coordinate translation
* @param int $r The radius of the pie in absolute coordinates
*
* @return DOMElement The group DOMElement containing the handle and label
*/
private function drawDescriptionLabel(RenderContext $ctx, $r)
{
$group = $ctx->getDocument()->createElement('g');
$rOuter = ($ctx->xToAbsolute($this->outerCaptionBound) + $ctx->yToAbsolute($this->outerCaptionBound)) / 2;
$addOffset = $rOuter - $r;
if ($addOffset < 0) {
$addOffset = 0;
}
list($x, $y) = $ctx->toAbsolute($this->x, $this->y);
$midRadius = $this->startRadian + ($this->endRadian - $this->startRadian) / 2;
list($offsetX, $offsetY) = $ctx->toAbsolute($this->captionOffset, $this->captionOffset);
$midX = $x + intval(($offsetX + $r) / 2 * sin($midRadius));
$midY = $y - intval(($offsetY + $r) / 2 * cos($midRadius));
// Draw the handle
$path = new Path(array($midX, $midY));
$midX += ($addOffset + $r / 1.8) * ($midRadius > M_PI ? -1 : 1);
$path->append(array($midX, $midY))->toAbsolute();
$midX += intval($r / 2 * sin(M_PI / 9)) * ($midRadius > M_PI ? -1 : 1);
$midY -= intval($r / 2 * cos(M_PI / 3)) * ($midRadius < M_PI * 1.4 && $midRadius > M_PI / 3 ? -1 : 1);
if ($ctx->ytoRelative($midY) > 100) {
$midY = $ctx->yToAbsolute(100);
} elseif ($ctx->ytoRelative($midY) < 0) {
$midY = $ctx->yToAbsolute($ctx->ytoRelative(100 + $midY));
}
$path->append(array($midX, $midY));
$rel = $ctx->toRelative($midX, $midY);
// Draw the text box
$text = new Text($rel[0] + 1.5, $rel[1], $this->caption);
$text->setFontSize('2.5em');
$text->setAlignment($midRadius > M_PI ? Text::ALIGN_END : Text::ALIGN_START);
$group->appendChild($path->toSvg($ctx));
$group->appendChild($text->toSvg($ctx));
return $group;
}
/**
* Render the vertical axis
*
* @param RenderContext $ctx The context to use for rendering
* @param DOMElement $group The DOMElement this axis will be added to
*/
private function renderVerticalAxis(RenderContext $ctx, DOMElement $group)
{
$steps = $this->ticksPerX($this->yUnit->getTicks(), $ctx->getNrOfUnitsY(), $this->minUnitsPerStep);
$ticks = $this->ticksPerX($this->yUnit->getTicks(), $ctx->getNrOfUnitsY(), $this->minUnitsPerTick);
// Steps should always be ticks
if ($ticks !== $steps) {
$steps = $ticks * 5;
}
/*
$line = new Line(0, 0, 0, 100);
$line->setStrokeWidth(2);
$group->appendChild($line->toSvg($ctx));
*/
$i = 0;
foreach ($this->yUnit as $label => $pos) {
$pos = 100 - $pos;
if ($i % $ticks === 0) {
// draw a tick
//$tick = new Line(0, $pos, -1, $pos);
//$group->appendChild($tick->toSvg($ctx));
}
if ($i % $steps === 0) {
// draw a step
$labelField = new Text(-0.5, $pos + 0.5, $label);
$labelField->setFontSize('2.5em')->setAlignment(Text::ALIGN_END);
$group->appendChild($labelField->toSvg($ctx));
if ($this->drawXGrid) {
$bgLine = new Line(0, $pos, 100, $pos);
$bgLine->setStrokeWidth(0.5)->setStrokeColor('#BFBFBF');
$group->appendChild($bgLine->toSvg($ctx));
}
}
$i++;
}
if ($this->yLabel || $this->xLabel) {
if ($this->yLabel && $this->xLabel) {
$txt = $this->yLabel . ' / ' . $this->xLabel;
} else {
if ($this->xLabel) {
$txt = $this->xLabel;
} else {
$txt = $this->yLabel;
}
}
$axisLabel = new Text(50, -3, $txt);
$axisLabel->setFontSize('2em')->setFontWeight('bold')->setAlignment(Text::ALIGN_MIDDLE);
$group->appendChild($axisLabel->toSvg($ctx));
}
}