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/*** /
This file is part of Golly, a Game of Life Simulator.
Copyright (C) 2009 Andrew Trevorrow and Tomas Rokicki.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Web site: http://sourceforge.net/projects/golly
Authors: rokicki@gmail.com andrew@trevorrow.com
/ ***/
#include "viewport.h"
#include "lifealgo.h"
#include <cmath>
#include <iostream>
#include <cstdio>
using namespace std ;
void viewport::init() {
x = 0 ;
y = 0 ;
height = width = 8 ;
mag = 0 ;
x0 = 0 ;
y0 = 0 ;
x0f = 0 ;
y0f = 0 ;
xymf = 0 ;
}
void viewport::zoom() {
if (mag >= MAX_MAG)
return ;
mag++ ;
reposition() ;
}
void viewport::zoom(int xx, int yy) {
if (mag >= MAX_MAG)
return ;
pair<bigint, bigint> oldpos = at(xx, yy); // save cell pos for use below
int x2c = xx * 2 - getxmax() ;
bigint o = x2c ;
o.mulpow2(-mag-2) ;
x += o ;
int y2c = yy * 2 - getymax() ;
o = y2c ;
o.mulpow2(-mag-2) ;
y += o ;
mag++ ;
reposition() ;
// adjust cell position if necessary to avoid any drift
if (mag >= 0) {
pair<bigint, bigint> newpos = at(xx, yy);
bigint xdrift = newpos.first;
bigint ydrift = newpos.second;
xdrift -= oldpos.first;
ydrift -= oldpos.second;
// drifts will be -1, 0 or 1
if (xdrift != 0) move(-xdrift.toint() << mag, 0);
if (ydrift != 0) move(0, -ydrift.toint() << mag);
}
}
void viewport::unzoom() {
mag-- ;
reposition() ;
}
void viewport::unzoom(int xx, int yy) {
pair<bigint, bigint> oldpos = at(xx, yy); // save cell pos for use below
mag-- ;
int x2c = xx * 2 - getxmax() ;
bigint o = x2c ;
o.mulpow2(-mag-2) ;
x -= o ;
int y2c = yy * 2 - getymax() ;
o = y2c ;
o.mulpow2(-mag-2) ;
y -= o ;
reposition() ;
// adjust cell position if necessary to avoid any drift
pair<bigint, bigint> newpos = at(xx, yy);
bigint xdrift = newpos.first;
bigint ydrift = newpos.second;
xdrift -= oldpos.first;
ydrift -= oldpos.second;
// drifts will be -1, 0 or 1
if (xdrift != 0) move(-xdrift.toint() << mag, 0);
if (ydrift != 0) move(0, -ydrift.toint() << mag);
}
pair<bigint, bigint> viewport::at(int x, int y) {
bigint rx = x ;
bigint ry = y ;
rx.mulpow2(-mag) ;
ry.mulpow2(-mag) ;
rx += x0 ;
ry += y0 ;
return pair<bigint, bigint>(rx, ry) ;
}
pair<double, double> viewport::atf(int x, int y) {
return pair<double, double>(x0f + x * xymf, y0f + y * xymf) ;
}
/**
* Returns the screen position of a particular pixel. Note that this
* is a tiny bit more complicated than you might expect, because it
* has to take into account exactly how a life algorithm compresses
* multiple pixels into a single pixel (which depends not only on the
* lifealgo, but in the case of qlifealgo, *also* depends on the
* generation count). In the case of mag < 0, it always returns
* the upper left pixel; it's up to the caller to adjust when
* mag<0.
*
* If the pixel is offscreen, it will return a value that is also
* offscreen, but only by one pixel.
* AKT: This code has been commented out because it makes it
* harder to calculate an accurate paste rectangle.
*/
pair<int,int> viewport::screenPosOf(bigint x, bigint y, lifealgo *algo) {
if (mag < 0) {
bigint xx0 = x0 ;
bigint yy0 = y0 ;
algo->lowerRightPixel(xx0, yy0, mag) ;
y -= yy0 ;
x -= xx0 ;
} else {
x -= x0 ;
y -= y0 ;
}
x.mulpow2(mag) ;
y.mulpow2(mag) ;
int xx = 0 ;
int yy = 0 ;
/* AKT: don't do this clipping
if (x < 0)
xx = -1 ;
else if (x > getxmax())
xx = getxmax() + 1 ;
else
*/
xx = x.toint() ;
/* AKT: don't do this clipping
if (y < 0)
yy = -1 ;
else if (y > getymax())
yy = getymax() + 1 ;
else
*/
yy = y.toint() ;
return pair<int,int>(xx,yy) ;
}
void viewport::move(int dx, int dy) {
// dx and dy are in pixels
if (mag > 0) {
dx /= (1 << mag) ;
dy /= (1 << mag) ;
}
bigint addx = dx ;
bigint addy = dy ;
if (mag < 0) {
addx <<= -mag ;
addy <<= -mag ;
}
x += addx ;
y += addy ;
reposition() ;
}
void viewport::resize(int newwidth, int newheight) {
width = newwidth ;
height = newheight ;
reposition() ;
}
void viewport::center() {
x = 0 ;
y = 0 ;
reposition() ;
}
void viewport::reposition() {
xymf = pow(2.0, -mag) ;
x0 = - getxmax() ;
y0 = - getymax() ;
x0.mulpow2(-mag) ;
y0.mulpow2(-mag) ;
x0 += 1 ;
y0 += 1 ;
x0 >>= 1 ;
y0 >>= 1 ;
x0 += x ;
y0 += y ;
y0f = y0.todouble() ;
x0f = x0.todouble() ;
}
void viewport::setpositionmag(const bigint &xarg, const bigint &yarg,
int magarg) {
x = xarg ;
y = yarg ;
mag = magarg ;
reposition() ;
}
int viewport::contains(const bigint &xarg, const bigint &yarg) {
bigint t = x ;
t -= xarg ;
t.mulpow2(mag+1) ;
if (t <= -getxmax() || t >= getxmax()) {
return 0 ;
}
t = y ;
t -= yarg ;
t.mulpow2(mag+1) ;
if (t <= -getymax() || t >= getymax()) {
return 0 ;
}
return 1 ;
}
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