/**
* Composites an Earth-scale indicator
*
* @param object $imagickImage An Imagick object
*
* @return void
*/
private function _addEarthScale($imagickImage)
{
$rect_width = 73;
$rect_height = 56;
// Calculate earth scale in piexls
$rsunInArcseconds = 959.705;
$earthFractionOfSun = 1 / 109.1;
$earthScaleInPixels = round(2 * $earthFractionOfSun * ($rsunInArcseconds / $this->roi->imageScale()));
// Convert x,y position of top left of EarthScale rectangle
// from arcseconds to pixels
if ($this->scaleX != 0 && $this->scaleY != 0) {
$topLeftX = ($this->scaleX - $this->roi->left()) / $this->roi->imageScale();
$topLeftY = (-$this->scaleY - $this->roi->top()) / $this->roi->imageScale();
} else {
$topLeftX = -1;
$topLeftY = $imagickImage->getImageHeight() - $rect_height;
}
// Draw black rectangle background for indicator and label
$draw = new ImagickDraw();
$draw->setFillColor('#00000066');
$draw->setStrokeColor('#888888FF');
$draw->rectangle($topLeftX, $topLeftY, $topLeftX + $rect_width, $topLeftY + $rect_height);
$imagickImage->drawImage($draw);
// Draw Earth to scale
if ($earthScaleInPixels >= 1) {
$earth = new IMagick(HV_ROOT_DIR . '/resources/images/earth.png');
$x = 1 + $topLeftX + $rect_width / 2 - $earthScaleInPixels / 2;
$y = 8 + $topLeftY + $rect_height / 2 - $earthScaleInPixels / 2;
$earth->resizeImage($earthScaleInPixels, $earthScaleInPixels, Imagick::FILTER_LANCZOS, 1);
$imagickImage->compositeImage($earth, IMagick::COMPOSITE_DISSOLVE, $x, $y);
}
// Draw grey rectangle background for text label
$draw = new ImagickDraw();
$draw->setFillColor('#333333FF');
$draw->rectangle($topLeftX + 1, $topLeftY + 1, $topLeftX + $rect_width - 1, $topLeftY + 16);
$imagickImage->drawImage($draw);
// Write 'Earth Scale' label in white
$text = new IMagickDraw();
$text->setTextEncoding('utf-8');
$text->setFont(HV_ROOT_DIR . '/../resources/fonts/DejaVuSans.ttf');
$text->setFontSize(10);
$text->setFillColor('#ffff');
$text->setTextAntialias(true);
$text->setStrokeWidth(0);
$x = $topLeftX + 9;
$y = $topLeftY + 13;
$imagickImage->annotateImage($text, $x, $y, 0, 'Earth Scale');
// Cleanup
if (isset($draw)) {
$draw->destroy();
}
if (isset($earth)) {
$earth->destroy();
}
if (isset($text)) {
$text->destroy();
}
}
