Chapter15_graph_drill_PPPC++

c15_d.cpp

/* 15章のグラフ描くほうのドリル */

#include "Simple_window.h"
#include "Graph.h"

double one(double x) { return 1; }

double slope(double x) { return x / 2; }

double square(double x) { return x * x; }

double sloping_cos(double x) { return cos(x)+slope(x); }

int main(){
    const int xmax = 600;
    const int ymax = 600;

    const int xoffset = 100;
    const int yoffset = 100;

    const int xspace = 100;
    const int yspace = 100;

    const int xlength = xmax - xoffset - xspace;
    const int ylength = ymax - yoffset - yspace;

    Simple_window win(Point(100, 100), xmax, ymax, "Function graphs");

    Axis x(Axis::x, Point(xoffset, ymax / 2), xlength, xlength / 20, "1==20 pixels");
    Axis y(Axis::y, Point(xmax / 2, ymax - yoffset), ylength, ylength / 20, "1==20 pixels");
    x.set_color(Color::red);
    y.set_color(Color::red);

    int xscale = 20; // 倍率
    int yscale = 20;

    const int f_min = -10;
    const int f_max = 11;

    const Point orig(300, 300);
    const int n_points = 400;  

    Function f_one(one, f_min, f_max, orig, n_points, xscale, yscale);
    Function f_slope(slope, f_min, f_max, orig, n_points, xscale, yscale);
    Text tf_slope(Point(xoffset, orig.y + 80), "x/2");
    Function f_square(square, f_min, f_max, orig, n_points, xscale, yscale);
    Function f_sloping_cos(sloping_cos, f_min, f_max, orig, n_points, xscale, yscale);
    f_sloping_cos.set_color(Color::blue);

    win.attach(f_one);
    win.attach(f_slope);
    win.attach(tf_slope);
    win.attach(f_square);
    win.attach(f_sloping_cos);

    win.attach(x);
    win.attach(y);
    win.wait_for_button();
}