matrix.cpp


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#include "matrix.h"

#include <cmath>

Matrix2::Matrix2() {
	m[0][0] = m[0][1] = 
	m[1][0] = m[1][1] = 0;
}

Matrix2::Matrix2(float m00, float m01, float m10, float m11) {
	m[0][0] = m00;
	m[0][1] = m01;
	m[1][0] = m10;
	m[1][1] = m11;
}

Matrix2 Matrix2::operator*(const Matrix2& mat) {
	return Matrix2(
		m[0][0] * mat.m[0][0] + m[0][1] * mat.m[1][0],
		m[0][0] * mat.m[0][1] + m[0][1] * mat.m[1][1],
		m[1][0] * mat.m[0][0] + m[1][1] * mat.m[1][0],
		m[1][0] * mat.m[0][1] + m[1][1] * mat.m[1][1]);
}

Matrix2 Matrix2::operator*(float f) {
	return Matrix2(
		m[0][0] * f,
		m[0][1] * f,
		m[1][0] * f,
		m[1][1] * f);
}

Vector2 Matrix2::operator*(const Vector2& v) {
	return Vector2(
		m[0][0] * v.x + m[0][1] * v.y,
		m[1][0] * v.x + m[1][1] * v.y);
}

Matrix2 rotation_matrix(float rot) {
	float s = sinf(rot);
	float c = cosf(rot);
	return Matrix2(
	c, -s,
	s, c);
}