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added some more random number utilities

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This commit is contained in:
Bob Polis 2020-11-16 10:39:58 +01:00
parent c3935312c4
commit 2e0d3a79f0
2 changed files with 27 additions and 14 deletions
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39
src/ScreensaverPlugin.cpp
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@ -25,27 +25,33 @@ void ScreensaverPlugin::make_black() {
} }
cairo_rectangle_t ScreensaverPlugin::random_rect() { cairo_rectangle_t ScreensaverPlugin::random_rect() {
cairo_rectangle_t rect; return random_rect_in_rect(_r);
}
cairo_rectangle_t ScreensaverPlugin::random_rect_in_rect(const cairo_rectangle_t& rect) {
cairo_rectangle_t r;
std::uniform_real_distribution<double> dx {rect.x, rect.width};
std::uniform_real_distribution<double> dy {rect.y, rect.height};
double v1, v2; double v1, v2;
v1 = random_x(); v1 = dx(_eng);
v2 = random_x(); v2 = dx(_eng);
if (v1 < v2) { if (v1 < v2) {
rect.x = v1; r.x = v1;
rect.width = v2 - v1; r.width = v2 - v1;
} else { } else {
rect.x = v2; r.x = v2;
rect.width = v1 - v2; r.width = v1 - v2;
} }
v1 = random_y(); v1 = dy(_eng);
v2 = random_y(); v2 = dy(_eng);
if (v1 < v2) { if (v1 < v2) {
rect.y = v1; r.y = v1;
rect.height = v2 - v1; r.height = v2 - v1;
} else { } else {
rect.y = v2; r.y = v2;
rect.height = v1 - v2; r.height = v1 - v2;
} }
return rect; return r;
} }
double ScreensaverPlugin::random_x() { double ScreensaverPlugin::random_x() {
@ -62,3 +68,8 @@ double ScreensaverPlugin::random01() {
std::uniform_real_distribution<double> dist {}; std::uniform_real_distribution<double> dist {};
return dist(_eng); return dist(_eng);
} }
double ScreensaverPlugin::random_between(double v1, double v2) {
std::uniform_real_distribution<double> dist {v1, v2};
return dist(_eng);
}

2
src/ScreensaverPlugin.hpp
View File

@ -31,9 +31,11 @@ class ScreensaverPlugin {
void make_black(); void make_black();
cairo_rectangle_t random_rect(); cairo_rectangle_t random_rect();
cairo_rectangle_t random_rect_in_rect(const cairo_rectangle_t& rect);
double random_x(); double random_x();
double random_y(); double random_y();
double random01(); double random01();
double random_between(double v1, double v2);
}; };
#endif // _ScreensaverPlugin_H_ #endif // _ScreensaverPlugin_H_