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collatz.cpp
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collatz.cpp
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// -*- Mode:C++; Coding:us-ascii-unix; fill-column:158 -*-
/*******************************************************************************************************************************************************.H.S.**/
/**
@file collatz.cpp
@author Mitch Richling <https://www.mitchr.me>
@brief Draw a mandelbrot-like fractal with the collatz map.@EOL
@std C++20
@see https://www.mitchr.me/SS/collatz/index.html
@copyright
@parblock
Copyright (c) 1988-2015, Mitchell Jay Richling <https://www.mitchr.me> All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions, and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions, and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
@endparblock
*/
/*******************************************************************************************************************************************************.H.E.**/
/** @cond exj */
//--------------------------------------------------------------------------------------------------------------------------------------------------------------
#include "ramCanvas.hpp"
//--------------------------------------------------------------------------------------------------------------------------------------------------------------
int main(void) {
std::chrono::time_point<std::chrono::system_clock> startTime = std::chrono::system_clock::now();
const int NUMITR = 164;
const int IMXSIZ = 7680/2;
const int IMYSIZ = 7680/2;
//mjr::ramCanvas3c8b theRamCanvas(IMXSIZ, IMYSIZ, -3.75, 3.75, -3.75, 3.75); // 56 centered 0+0i
//mjr::ramCanvas3c8b theRamCanvas(IMXSIZ, IMYSIZ, -0.99-0.15, -0.99+0.15, -0.15, 0.15); // 28 centered near 1+i
mjr::ramCanvas3c8b theRamCanvas(IMXSIZ, IMYSIZ, -0.99-0.03, -0.99+0.03, -0.03, 0.03); // 28 same, zoomed in
for(int y=0;y<theRamCanvas.getNumPixY();y++) {
for(int x=0;x<theRamCanvas.getNumPixX();x++) {
std::complex<double> z = theRamCanvas.int2real(x, y);
int count = 0;
while((std::norm(z)<1e10) && (count<=NUMITR)) {
z = 0.25 * (2.0 + 7.0*z - (2.0 + 5.0 * z) * std::cos(z * std::numbers::pi));
count++;
}
if(count < NUMITR)
theRamCanvas.drawPoint(x, y, mjr::ramCanvas3c8b::colorType::csCCsumRGB::c(static_cast<mjr::ramCanvas3c8b::csIntType>(count*28)));
}
}
theRamCanvas.writeTIFFfile("collatz.tiff");
std::chrono::duration<double> runTime = std::chrono::system_clock::now() - startTime;
std::cout << "Total Runtime " << runTime.count() << " sec" << std::endl;
}
/** @endcond */