import java.awt.*;

public class CircleStack extends BufferedApplet {
	int endx = 250, endy = 250; // Where stack is aimed (initially center, for concentric circles)

	public void render(Graphics g) {

		// WHENEVER THERE IS "DAMAGE", WE NEED TO REDRAW

		if (damage) {

			// SET COLOR TO WHITE AND CLEAR THE APPLET WINDOW
			g.setColor(Color.white);
			g.fillRect(0, 0, bounds().width, bounds().height);

			// Set up info for circles
			int numcircles = 150;
			double x = 100;		// xy coordinates for top of
			double y = 100;		// 		the first circle
			double d = 300;		// diameter of first circle

			double centerx = x + (d / 2);	// Center of first circle
			double centery = y + (d / 2);

			// These are how much x, y, and d change for each new circle
			double xoffset = (centerx - endx) / numcircles;
			double yoffset = (centery - endy) / numcircles;
			double doffset = d / numcircles;

			// draw first circle
			g.setColor(new Color(200, 255, 200));
			g.fillOval((int) x, (int) y, (int) d, (int) d);
			g.setColor(Color.black);
			g.drawOval((int) x, (int) y, (int) d, (int) d);

			for (int i = 1; i < numcircles; i++) {
				// prepare next circle
				d -= doffset;
				centerx -= xoffset;
				centery -= yoffset;
				x = centerx - (d / 2);
				y = centery - (d / 2);

				//				draw circle
				g.setColor(new Color(200, 255, 200));
				g.fillOval((int) x, (int) y, (int) d, (int) d);
				g.setColor(Color.black);
				g.drawOval((int) x, (int) y, (int) d, (int) d);
			}
		}
	}

	public boolean mouseDrag(Event e, int x, int y) {
		this.endx = x;
		this.endy = y;
		damage = true;
		return true;
	}
	
	public boolean mouseDown(Event e, int x, int y) {
		this.endx = x;
		this.endy = y;
		damage = true;
		return true;
	}
	
	public boolean mouseUp(Event e, int x, int y) {
		this.endx = x;
		this.endy = y;
		damage = true;
		return true;
	}
}