haiku.git

/*
 * Copyright 2010-2011, Haiku, Inc. All Rights Reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *		Geoffry Song, goffrie@gmail.com
 */
#ifndef _BUTTERFLY_H_
#define _BUTTERFLY_H_


#include <ScreenSaver.h>


class Butterfly : public BScreenSaver {
public:
								Butterfly(BMessage* archive, image_id imageID);

	virtual	void				StartConfig(BView* view);
	virtual status_t			StartSaver(BView* view, bool preview);
	virtual void				Draw(BView* view, int32 frame);

private:
	inline	rgb_color			_HueToColor(float hue);
	inline	BPoint				_Iterate();

private:
			// base value for calculating the curves on each iteration
			float				fBase;
			// previously calculated points
			BPoint				fLast[3];
			// transformation from graph coordinates to view coordinates
			float				fScale;
			BPoint				fTrans;
			// bounding box of drawn figure
			BRect				fBounds;
};


#endif  // _BUTTERFLY_H_