Method grow

ij/src/main/java/ij/gui/Roi.java:905–949

(int sx, int sy)

	}

	protected void grow(int sx, int sy) {
		if (clipboard!=null) return;
		int xNew = ic.offScreenX2(sx);
		int yNew = ic.offScreenY2(sy);
		if (type==RECTANGLE) {
			if (xNew < 0) xNew = 0;
			if (yNew < 0) yNew = 0;
		}
		if (constrain) {
			// constrain selection to be square
			if (!center)
				{growConstrained(xNew, yNew); return;}
			int dx, dy, d;
			dx = xNew - x;
			dy = yNew - y;
			if (dx<dy)
				d = dx;
			else
				d = dy;
			xNew = x + d;
			yNew = y + d;
		}
		if (center) {
			width = Math.abs(xNew - startX)*2;
			height = Math.abs(yNew - startY)*2;
			x = startX - width/2;
			y = startY - height/2;
		} else {
			width = Math.abs(xNew - startX);
			height = Math.abs(yNew - startY);
			x = (xNew>=startX)?startX:startX - width;
			y = (yNew>=startY)?startY:startY - height;
			if (type==RECTANGLE) {
				if ((x+width) > xMax) width = xMax-x;
				if ((y+height) > yMax) height = yMax-y;
			}
		}
		updateClipRect();
		imp.draw(clipX, clipY, clipWidth, clipHeight);
		oldX = x;
		oldY = y;
		oldWidth = width;
		oldHeight = height;
		bounds = null;
	}

	private void growConstrained(int xNew, int yNew) {
		int dx = xNew - startX;