163 lines
4.2 KiB
C++
163 lines
4.2 KiB
C++
#pragma once
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#include "pch.hpp"
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inline constexpr bool feq(float v1, float v2) {
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return std::abs(v1 - v2) < std::numeric_limits<float>::epsilon();
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}
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struct Point {
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union {
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float x;
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float w;
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};
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union {
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float y;
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float h;
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};
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};
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struct Rect {
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float x;
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float y;
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float w;
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float h;
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};
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struct Color {
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float r;
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float g;
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float b;
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float a;
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};
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using Size = Point;
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using Rect = Rect;
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Point operator+(const Point& p1, const Point& p2);
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Point operator-(const Point& p1, const Point& p2);
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Point operator*(const Point& p1, const Point& p2);
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Point operator/(const Point& p1, const Point& p2);
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Point operator*(const Point& p, float value);
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Point operator*(float value, const Point& p);
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Point operator/(const Point& p, float value);
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Point& operator+=(Point& p1, const Point& p2);
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Point& operator-=(Point& p1, const Point& p2);
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Point& operator*=(Point& p1, const Point& p2);
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Point& operator/=(Point& p1, const Point& p2);
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inline float Len2(const Point& p) {
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return p.x * p.x + p.y * p.y;
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}
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inline float Len(const Point& p) {
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return std::sqrt(Len2(p));
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}
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inline Point Normalize(const Point& p) {
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return p / Len(p);
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}
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template <typename T>
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T Random(const T& low, const T& high) {
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static_assert(std::is_floating_point<T>::value || std::is_integral<T>::value);
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std::random_device device;
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if (std::is_floating_point<T>::value) {
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std::uniform_real_distribution<T> dist(low, high);
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return dist(device);
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} else {
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std::uniform_int_distribution<T> dist(low, high);
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return dist(device);
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}
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}
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inline char Sign(float value) {
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if (value > 0)
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return 1;
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else if (value < 0)
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return -1;
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else
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return 0;
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}
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inline float Clamp(float min, float max, float value) {
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if (value > max)
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return max;
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if (value < min)
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return min;
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return value;
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}
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inline bool IsRectsIntersect(const Rect& r1, const Rect& r2) {
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return !(r1.x > r2.x + r2.w ||
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r1.x + r1.w < r2.x ||
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r1.y > r2.x + r2.h ||
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r1.y + r1.h < r2.y);
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}
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Rect RectsIntersect(const Rect& r1, const Rect& r2);
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inline bool IsPointInRect(const Point& p, const Rect& r) {
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return r.x <= p.x && r.y <= p.y && r.x + r.w >= p.x && r.y + r.h >= p.y;
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}
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/* a matrix stored in row major*/
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class Mat44{
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public:
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static const Mat44 Eye;
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Mat44();
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Mat44(const std::initializer_list<float>& l);
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inline void Fill(float t) { data_.fill(t); }
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float Get(const Point& p) const;
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void Set(const Point& p, const float& value);
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bool InMat(const Point& p) const;
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inline const float* Data() const { return data_.data(); }
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protected:
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std::array<float, 4 * 4> data_;
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};
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inline double Radians(double degree) {
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return degree * M_PI / 180.0;
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}
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inline double Degress(double radians) {
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return radians * 180.0 / M_PI;
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}
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inline double Cross2D(const Point& v1, const Point& v2) {
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return v1.x * v2.y - v2.x * v1.y;
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}
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inline Mat44 CreateOrthoMat(float left, float right,
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float bottom, float top,
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float near, float far) {
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return Mat44({
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2.0f/(right - left), 0, 0, (right + left)/(left - right),
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0, 2.0f/(top - bottom), 0, (top + bottom)/(bottom - top),
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0, 0, 2.0f/(near - far), (near + far)/(far - near),
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0, 0, 0, 1,
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});
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}
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inline Point GetCenterAlign(const Rect& parent, const Size& child) {
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return Point{parent.x + (parent.w - child.w) / 2.0f,
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parent.y + (parent.h - child.h) / 2.0f};
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}
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inline Mat44 CreateSRT(const Point& pos, const Point& scale, float degree) {
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float theta = Radians(degree);
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float sinTheta = std::sin(theta),
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cosTheta = std::cos(theta);
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return Mat44({
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scale.x * cosTheta, scale.y * sinTheta, 0, pos.x,
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-scale.x * sinTheta, scale.y * cosTheta, 0, pos.y,
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0, 0, 1, 0,
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0, 0, 0, 1,
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});
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}
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