I made a small function pointer plotter in SFML, thinking that someone might want to use it in some way. The code below contains the plot function and some usage examples:
#include <SFML/graphics.hpp>
#include <cmath>
#include <random>
using namespace std;
template <typename T1, typename T2>
void plot(T1 (*f)(T2), T2 begin, T2 last, T2 step, T1 yMin, T1 yMax, sf::Color plotColor, sf::Color axisColor, sf::RenderWindow& window) {
T2 current = begin;
if(axisColor != sf::Color::Transparent) {
sf::RectangleShape xAxis, yAxis;
xAxis.setSize(sf::Vector2f(window.getSize().x, 1));
xAxis.setPosition(0, yMax/(yMax-yMin)*window.getSize().y);
xAxis.setFillColor(axisColor);
yAxis.setSize(sf::Vector2f(1, window.getSize().y));
yAxis.setPosition((-begin)/(last-begin)*window.getSize().x, 0);
yAxis.setFillColor(axisColor);
window.draw(xAxis), window.draw(yAxis);
}
if(step == 0) return;
sf::RectangleShape v(sf::Vector2f(1, 1));
v.setFillColor(plotColor);
for(; current <= last; current += step) {
v.setPosition((float)(current-begin)/(last-begin)*window.getSize().x,
(yMax-f(current))/(yMax-yMin)*window.getSize().y);
window.draw(v);
}
}
template <typename T1, typename T2>
void plot(vector <pair<T1 (*)(T2), sf::Color>> fs, T2 begin, T2 last, T2 step, T1 yMin, T1 yMax, sf::Color axisColor, sf::RenderWindow& window) {
if(fs.size())
plot(fs[0].first, begin, last, step, yMin, yMax, fs[0].second, axisColor, window);
for(int i = 1; i < fs.size(); ++ i)
plot(fs[i].first, begin, last, step, yMin, yMax, fs[i].second, sf::Color::Transparent, window);
};
float timesort(int nElements) {
sf::Clock clock;
std::vector <int> elements(nElements);
std::random_device dev;
std::mt19937 mt (dev());
std::uniform_int_distribution <int> dist(0, 1 << 30);
for(auto &e: elements)
e = dist(mt);
clock.restart();
std::sort(elements.begin(), elements.end());
return clock.getElapsedTime().asSeconds();
}
int main() {
sf::RenderWindow window(sf::VideoMode::getDesktopMode(), "Math Functions");
redraw:
window.clear(sf::Color::Black);
plot((vector <pair<float (*)(float), sf::Color>>){
{&sin, sf::Color::Green},
{&exp, sf::Color::Blue},
{&tgamma, sf::Color::Magenta},
{&log, sf::Color::Red}
}, -3.0f, 5.0f, 0.0001f, -20.0f, 20.0f, sf::Color::White, window);
window.display();
while(window.isOpen()) {
sf::sleep(sf::milliseconds(30));
sf::Event event;
while(window.pollEvent(event))
switch(event.type) {
case sf::Event::Resized:
window.setView(sf::View(sf::FloatRect(0, 0, event.size.width, event.size.height)));
goto redraw;
case sf::Event::Closed:
window.close();
}
}
sf::RenderWindow window2(sf::VideoMode::getDesktopMode(), "Vector sort times");
redraw2:
window2.clear(sf::Color::Black);
plot(×ort, 100, 100000, 100, .0f, 0.01f, sf::Color::Magenta, sf::Color::Transparent, window2);
window2.display();
while(window2.isOpen()) {
sf::sleep(sf::milliseconds(30));
sf::Event event;
while(window2.pollEvent(event))
switch(event.type) {
case sf::Event::Resized:
window2.setView(sf::View(sf::FloatRect(0, 0, event.size.width, event.size.height)));
goto redraw2;
case sf::Event::Closed:
window2.close();
}
}
return 0;
}
Upon running the code, the first window gets created:
After closing that window, the second windows is created:
I hope someone can find some fun usages for this. As it can be used on many 1 dim -> 1 dim functions, you can use it to fine tune variables, debug, etc. I will try to keep up with the thread and see if anyone can make something cool with it.
