10000 clang format · krahuldnkr/matplotlib-cpp@ea526f2 · GitHub
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examples/update.cpp

Lines changed: 37 additions & 40 deletions
Original file line numberDiff line numberDiff line change
@@ -1,60 +1,57 @@
11
#define _USE_MATH_DEFINES
2-
#include <cmath>
32
#include "../matplotlibcpp.h"
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#include <chrono>
4+
#include <cmath>
55

66
namespace plt = matplotlibcpp;
77

88
void update_window(const double x, const double y, const double t,
9-
std::vector<double> &xt, std::vector<double> &yt)
10-
{
11-
const double target_length = 300;
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const double half_win = (target_length/(2.*sqrt(1.+t*t)));
13-
14-
xt[0] = x - half_win;
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xt[1] = x + half_win;
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yt[0] = y - half_win*t;
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yt[1] = y + half_win*t;
9+
std::vector<double> &xt, std::vector<double> &yt) {
10+
const double target_length = 300;
11+
const double half_win = (target_length / (2. * sqrt(1. + t * t)));
12+
13+
xt[0] = x - half_win;
14+
xt[1] = x + half_win;
15+
yt[0] = y - half_win * t;
16+
yt[1] = y + half_win * t;
1817
}
1918

19+
int main() {
20+
size_t n = 1000;
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std::vector<double> x, y;
2022

21-
int main()
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{
23-
size_t n = 1000;
24-
std::vector<double> x, y;
23+
const double w = 0.05;
24+
const double a = n / 2;
2525

26-
const double w = 0.05;
27-
const double a = n/2;
26+
for (size_t i = 0; i < n; i++) {
27+
x.push_back(i);
28+
y.push_back(a * sin(w * i));
29+
}
2830

29-
for (size_t i=0; i<n; i++) {
30-
x.push_back(i);
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y.push_back(a*sin(w*i));
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}
31+
std::vector<double> xt(2), yt(2);
3332

34-
std::vector<double> xt(2), yt(2);
33+
plt::title("Tangent of a sine curve");
34+
plt::xlim(x.front(), x.back());
35+
plt::ylim(-a, a);
36+
plt::axis("equal");
3537

36-
plt::title("Tangent of a sine curve");
37-
plt::xlim(x.front(), x.back());
38-
plt::ylim(-a, a);
39-
plt::axis("equal");
38+
// Plot sin once and for all.
39+
plt::named_plot("sin", x, y);
4040

41-
// Plot sin once and for all.
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plt::named_plot("sin", x, y);
41+
// Prepare plotting the tangent.
42+
plt::Plot plot("tangent");
4343

44-
// Prepare plotting the tangent.
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plt::Plot plot("tangent");
44+
plt::legend();
4645

47-
plt::legend();
46+
for (size_t i = 0; i < n; i++) {
47+
if (i % 10 == 0) {
48+
update_window(x[i], y[i], a * w * cos(w * x[i]), xt, yt);
4849

49-
for (size_t i=0; i<n; i++) {
50-
if (i % 10 == 0) {
51-
update_window(x[i], y[i], a*w*cos(w*x[i]), xt, yt);
50+
// Just update data for this plot.
51+
plot.update(xt, yt);
5252

53-
// Just update data for this plot.
54-
plot.update(xt, yt);
55-
56-
// Small pause so the viewer has a chance to enjoy the animation.
57-
plt::pause(0.1);
58-
}
59-
}
53+
// Small pause so the viewer has a chance to enjoy the animation.
54+
plt::pause(0.1);
55+
}
56+
}
6057
}

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