Draw a pretty heart with imglib2

cardioid2022.groovy

/**
 * Happy Valentine's day 2022
 * 
 * author: John Bogovic
 */

import net.imglib2.*;
import net.imglib2.view.*;
import net.imglib2.img.array.*;
import net.imglib2.img.imageplus.*;
import net.imglib2.type.numeric.*;

def cardioid( img, radius, color ) {

	nx = img.dimension( 0 );
	xc = img.dimension( 0 ) * 0.7;
	yc = img.dimension( 1 ) * 0.5;
	
	ra = img.randomAccess();
	for( double t = 0; t < 2 * Math.PI; t += 0.001 ) {
		cos = Math.cos( t );
		sin = Math.sin( t );
		x = 2 * radius * ( 1 - cos ) * cos;
		y = 2 * radius * ( 1 - cos ) * sin;
		ra.setPosition(nx - Math.round(xc+x), 1);
		ra.setPosition(Math.round(yc+y), 0);

		ra.get().set(color);
	}
}
	
imgRaw = ImagePlusImgs.argbs(256, 256);
imp = imgRaw.getImagePlus();
imp.show();

imp.getCanvas().zoomIn( 128, 128 );
imp.getCanvas().zoomIn( 128, 128 );
imp.getCanvas().zoomIn( 128, 128 );


for( i in 1..128) {
	r = 0.25 * i;
	c = ARGBType.rgba(255, 255-(2*i), 255-(2*i), 255);
	cardioid( imgRaw, r, c );
	imp.repaintWindow();
	Thread.sleep( 50 );
}