Reorganize Gene code

src/Genes.cpp

@@ -0,0 +1,142 @@
+#include "Genes.hpp"
+
+#include <algorithm>
+
+#if __GNUC__ < 7 // gcc 7 will support clamp
+namespace std {
+	template<typename T>
+	T clamp(T v, T lo, T hi)
+	{
+		return std::min(hi, std::max(lo, v));
+	}
+}
+#endif
+
+
+
+// Common to all genes
+std::minstd_rand* Gene::re;
+sf::Vector2f Gene::size;
+
+
+Gene::~Gene()
+{
+}
+
+
+
+// GeneCircle
+sf::CircleShape GeneCircle::circle(0, 36);
+float GeneCircle::stddev_position = .1;  // in percent of min side length
+float GeneCircle::stddev_radius = .1;    // in percent of max radius
+float GeneCircle::stddev_color = 20;     // absolute value
+
+
+GeneCircle::~GeneCircle()
+{
+}
+
+
+void GeneCircle::draw(sf::RenderTarget& target, sf::RenderStates states) const
+{
+	this->circle.setPosition(this->position);
+	this->circle.setRadius(this->radius);
+	this->circle.setFillColor(this->color);
+	target.draw(this->circle, states);
+}
+
+
+void GeneCircle::randomize()
+{
+}
+
+
+void GeneCircle::mutate()
+{
+	std::uniform_int_distribution<> choicedist(0, 2);
+	
+	switch (choicedist(*Gene::re)) {
+		case 0:
+			this->mutatePosition();
+			break;
+		case 1:
+			this->mutateRadius();
+			break;
+		case 2:
+			this->mutateColor();
+			break;
+	}
+}
+
+
+void GeneCircle::mutatePosition()
+{
+	std::normal_distribution<> posdist(0, GeneCircle::stddev_position);
+	float min_side = std::min(Gene::size.x, Gene::size.y);
+	
+	this->position.x = std::clamp<float>(
+		this->position.x + posdist(*Gene::re)*min_side,
+		0,
+		Gene::size.x
+	);
+	
+	this->position.y = std::clamp<float>(
+		this->position.y + posdist(*Gene::re)*min_side,
+		0,
+		Gene::size.y
+	);
+}
+
+
+void GeneCircle::mutateRadius()
+{
+	std::normal_distribution<> raddist(0, GeneCircle::stddev_radius);
+	float max_radius = this->maxRadius();
+	
+	this->radius = std::clamp<float>(
+// 		gene.radius + pow(raddist(*Gene::re)*sqrt(max_radius), 2),
+		this->radius + raddist(*Gene::re)*max_radius,
+		0,
+		max_radius
+	);
+}
+
+
+void GeneCircle::mutateColor()
+{
+	std::normal_distribution<> coldist(0, GeneCircle::stddev_color);
+	
+	this->color.r = std::clamp<unsigned int>(this->color.r + coldist(*Gene::re), 0, 255);
+	this->color.g = std::clamp<unsigned int>(this->color.g + coldist(*Gene::re), 0, 255);
+	this->color.b = std::clamp<unsigned int>(this->color.b + coldist(*Gene::re), 0, 255);
+	this->color.a = std::clamp<unsigned int>(this->color.a + coldist(*Gene::re), 0, 255);
+}
+
+
+float GeneCircle::maxRadius()
+{
+// 	return std::min(Gene::size.x, Gene::size.y);
+	return std::min(Gene::size.x, Gene::size.y)/2;
+}
+
+
+
+// GeneTriangle
+GeneTriangle::~GeneTriangle()
+{
+}
+
+
+void GeneTriangle::draw(sf::RenderTarget& target, sf::RenderStates states) const
+{
+}
+
+
+void GeneTriangle::randomize()
+{
+}
+
+
+void GeneTriangle::mutate()
+{
+}