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// This file is part of Golly.
// See docs/License.html for the copyright notice.
#ifndef VIEWPORT_H
#define VIEWPORT_H
#include "bigint.h"
#include <utility>
using std::pair;
using std::make_pair;
class lifealgo ;
/**
* This class holds information on where in space the user's window is.
* It provides the functions to zoom, unzoom, move, etc.
*
* The reason we need a whole class is because doing this in a universe
* that may be billions of billions of cells on a side, but we still
* want single cell precision, is a bit tricky.
*/
class viewport {
public:
viewport(int width, int height) {
init() ;
resize(width, height) ;
}
void zoom() ;
void zoom(int x, int y) ;
void unzoom() ;
void unzoom(int x, int y) ;
void center() ;
pair<bigint, bigint> at(int x, int y) ;
pair<double, double> atf(int x, int y) ;
pair<int,int> screenPosOf(bigint x, bigint y, lifealgo *algo) ;
void resize(int newwidth, int newheight) ;
void move(int dx, int dy) ; // dx and dy are given in pixels
int getmag() const { return mag ; }
void setmag(int magarg) { mag = magarg ; reposition() ; }
void setpositionmag(const bigint &xarg, const bigint &yarg, int magarg) ;
void setpositionmag(const bigint &xlo, const bigint &xhi,
const bigint &ylo, const bigint &yhi, int magarg) ;
int getwidth() const { return width ; }
int getheight() const { return height ; }
int getxmax() const { return width-1 ; }
int getymax() const { return height-1 ; }
int contains(const bigint &x, const bigint &y) ;
bigint x, y ; // cell at center of viewport
private:
void init() ;
void reposition() ; // recalculate *0* and *m* values
int width, height ;
int mag ; // plus is zoom in; neg is zoom out
bigint x0, y0 ;
double x0f, y0f ;
double xymf ; // always = 2**-mag
} ;
extern int MAX_MAG;
// maximum cell size is 2^MAX_MAG (default is 2^4, but devices with
// high-resolution screens will probably want a bigger cell size)
#endif
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