/**
* Draw grid
*
* Draws a grid line at the current position
*
* @param ezcGraphRenderer $renderer Renderer to draw the grid with
* @param ezcGraphBoundings $boundings Boundings of axis
* @param ezcGraphCoordinate $position Position of step
* @param ezcGraphCoordinate $direction Direction of axis
* @param ezcGraphColor $color Color of axis
* @param int $stepPosition
* @return void
*/
protected function drawGrid(ezcGraphRenderer $renderer, ezcGraphBoundings $boundings, ezcGraphCoordinate $position, ezcGraphCoordinate $direction, ezcGraphColor $color, $stepPosition = null)
{
// Calculate position on last axis
$start = new ezcGraphCoordinate($boundings->x0 + ($width = $boundings->width / 2), $boundings->y0 + ($height = $boundings->height / 2));
$lastAngle = $this->lastStep * 2 * M_PI;
$end = new ezcGraphCoordinate($start->x + sin($lastAngle) * $width, $start->y - cos($lastAngle) * $height);
$direction = new ezcGraphVector($end->x - $start->x, $end->y - $start->y);
$direction->unify();
// Convert elipse to circle for correct angle calculation
$direction->y *= $renderer->xAxisSpace / $renderer->yAxisSpace;
$angle = $direction->angle(new ezcGraphVector(0, 1));
$movement = new ezcGraphVector(sin($angle) * $renderer->xAxisSpace * ($direction->x < 0 ? -1 : 1), cos($angle) * $renderer->yAxisSpace);
$start->x += $movement->x;
$start->y += $movement->y;
$end->x -= $movement->x;
$end->y -= $movement->y;
$lastPosition = new ezcGraphCoordinate($start->x + ($end->x - $start->x) * $stepPosition, $start->y + ($end->y - $start->y) * $stepPosition);
$renderer->drawGridLine($position, $lastPosition, $color);
}
/**
* Draw rectangular grid
*
* Draws a grid line at the current position for rectangular directed axis.
*
* Method special for rectangularly directed axis to minimize the floating
* point calculation inaccuracies. Those are not necessary for rectangles,
* while for non-rectangular directed axis.
*
* @param ezcGraphRenderer $renderer Renderer to draw the grid with
* @param ezcGraphBoundings $boundings Boundings of axis
* @param ezcGraphCoordinate $position Position of step
* @param ezcGraphCoordinate $direction Direction of axis
* @param ezcGraphColor $color Color of axis
* @return void
*/
protected function drawRectangularGrid(ezcGraphRenderer $renderer, ezcGraphBoundings $boundings, ezcGraphCoordinate $position, ezcGraphCoordinate $direction, ezcGraphColor $color)
{
if (abs($direction->x) < 1.0E-5) {
$renderer->drawGridLine(new ezcGraphCoordinate($boundings->x0, $position->y), new ezcGraphCoordinate($boundings->x1, $position->y), $color);
} else {
$renderer->drawGridLine(new ezcGraphCoordinate($position->x, $boundings->y0), new ezcGraphCoordinate($position->x, $boundings->y1), $color);
}
}
/**
* Draw grid
*
* Draws a grid line at the current position
*
* @param ezcGraphRenderer $renderer Renderer to draw the grid with
* @param ezcGraphBoundings $boundings Boundings of axis
* @param ezcGraphCoordinate $position Position of step
* @param ezcGraphCoordinate $direction Direction of axis
* @param ezcGraphColor $color Color of axis
* @return void
*/
protected function drawGrid(ezcGraphRenderer $renderer, ezcGraphBoundings $boundings, ezcGraphCoordinate $position, ezcGraphCoordinate $direction, ezcGraphColor $color)
{
// Direction of grid line is direction of axis turned right by 90
// degrees
$gridDirection = new ezcGraphCoordinate($direction->y, -$direction->x);
$cuttingPoints = array();
foreach (array(array('start' => new ezcGraphCoordinate($boundings->x0, $boundings->y0), 'dir' => new ezcGraphCoordinate(0, $boundings->y1 - $boundings->y0)), array('start' => new ezcGraphCoordinate($boundings->x0, $boundings->y0), 'dir' => new ezcGraphCoordinate($boundings->x1 - $boundings->x0, 0)), array('start' => new ezcGraphCoordinate($boundings->x1, $boundings->y1), 'dir' => new ezcGraphCoordinate(0, $boundings->y0 - $boundings->y1)), array('start' => new ezcGraphCoordinate($boundings->x1, $boundings->y1), 'dir' => new ezcGraphCoordinate($boundings->x0 - $boundings->x1, 0))) as $boundingLine) {
// Test for cutting points with bounding lines, where cutting
// position is between 0 and 1, which means, that the line is hit
// on the bounding box rectangle. Use these points as a start and
// ending point for the grid lines. There should *always* be
// exactly two points returned.
$cuttingPosition = $this->determineLineCuttingPoint($boundingLine['start'], $boundingLine['dir'], $position, $gridDirection);
if ($cuttingPosition === false) {
continue;
}
// Round to prevent minor float incorectnesses
$cuttingPosition = abs(round($cuttingPosition, 2));
if ($cuttingPosition >= 0 && $cuttingPosition <= 1) {
$cuttingPoints[] = new ezcGraphCoordinate($boundingLine['start']->x + $cuttingPosition * $boundingLine['dir']->x, $boundingLine['start']->y + $cuttingPosition * $boundingLine['dir']->y);
}
}
if (count($cuttingPoints) < 2) {
// This should not happpen
return false;
}
// Finally draw grid line
$renderer->drawGridLine($cuttingPoints[0], $cuttingPoints[1], $color);
}
