package de.fhpotsdam.unfolding.examples.interaction.snapshot;
import processing.core.PApplet;
import processing.core.PConstants;
import processing.core.PGraphics;
import processing.core.PImage;
import de.fhpotsdam.unfolding.UnfoldingMap;
/**
* Stores a circular thumbnail of the current map, and current map status data (from MapSnapshot).
*/
public class CircularMapSnapshot extends MapSnapshot {
public CircularMapSnapshot(PApplet p, UnfoldingMap map) {
super(p, map);
}
@Override
public void snapshot(UnfoldingMap map) {
super.snapshot(map);
thumbnail = getCircularImage(thumbnail, 200, 5);
}
// By amnon.owed, http://forum.processing.org/topic/extract-circle-texture-from-background-with-alpha-channel
public PImage getCircularImage(PImage img, int radius, int feather) {
PGraphics temp = p.createGraphics(img.width, img.height, PConstants.JAVA2D);
temp.beginDraw();
temp.smooth();
temp.translate(temp.width / 2, temp.height / 2);
temp.imageMode(PConstants.CENTER);
temp.image(img, 0, 0);
temp.endDraw();
PImage saveArea = p.createImage(temp.width, temp.height, PConstants.ARGB);
for (int y = 0; y < saveArea.height; y++) {
for (int x = 0; x < saveArea.width; x++) {
int index = y + x * saveArea.width;
float d = PApplet.dist(x, y, radius, radius);
if (d > radius) {
saveArea.pixels[index] = 0;
} else if (d >= radius - feather) {
int c = temp.pixels[index];
int r = (c >> 16) & 0xff;
int g = (c >> 8) & 0xff;
int b = (c) & 0xff;
c = p.color(r, g, b, PApplet.map(d, radius - feather, radius, 255, 0));
saveArea.pixels[index] = c;
} else {
saveArea.pixels[index] = temp.pixels[index];
}
}
}
saveArea.updatePixels();
return saveArea;
}
}