/**
* Calculates the position of grid lines
*/
protected function CalcGrid()
{
if (isset($this->y_points)) {
return;
}
$this->arad = (90 + $this->start_angle) * M_PI / 180;
parent::CalcGrid();
$grid_bottom = $this->height - $this->pad_bottom;
$grid_left = $this->pad_left;
// want only Y size, not actual position
foreach ($this->y_points as $point => $ygrid) {
$this->y_points[$point] = $grid_bottom - $ygrid;
}
if ($this->sub_y) {
foreach ($this->y_subdivs as $point => $ygrid) {
$this->y_subdivs[$point] = $grid_bottom - $ygrid;
}
}
// same with X, only want distance
foreach ($this->x_points as $point => $xgrid) {
$new_x = $xgrid - $grid_left;
$this->x_points[$point] = $new_x;
$this->grid_angles[] = $this->arad + $new_x / $this->g_height;
}
if ($this->sub_x) {
foreach ($this->x_subdivs as $point => $xgrid) {
$new_x = $xgrid - $grid_left;
$this->x_subdivs[$point] = $new_x;
$this->grid_angles[] = $this->arad + $new_x / $this->g_height;
}
}
// put the grid angles in order
sort($this->grid_angles);
}
