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完成了回家作业: 绘制OpenCV Logo并且带动画 #55

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完成了回家作业: 绘制OpenCV Logo并且带动画 #55

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4 changes: 2 additions & 2 deletions glm/CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
cmake_policy(VERSION 3.2)
# cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
# cmake_policy(VERSION 3.2)


file(READ "glm/detail/setup.hpp" GLM_SETUP_FILE)
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100 changes: 72 additions & 28 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2,41 +2,85 @@
#include <glm/ext.hpp>
#include "check_gl.hpp" // includes glad/glad.h
#include <GLFW/glfw3.h> // must be placed behind glad/glad.h
#include <stdexcept>
#include <iostream>
#include <cstring>
#include <cstdlib>

constexpr int Fineness = 120;
constexpr float pi = 3.1415926535897f;

/**
* @brief 通过度数范围计算为对应百分比
* @param du [0, 360]
* @return constexpr int
*/
constexpr int getShowRoundPercentage(float du) {
return static_cast<int>(Fineness * (du / 360.f));
}

/**
* @brief 画一个圆, 位于 (x, y), 半径是 r, 环半径是 r - dr
* @tparam IsClockwise 是否是顺时针
* @param x [-1, 1]
* @param y [-1, 1]
* @param r [-1, 1]
* @param dr [-1, 1]
* @param step 渲染步数
* @param begin 渲染起始位置
* @param end 渲染结束位置 [0, Fineness]
*/
template <bool IsClockwise>
void showRound(
float x, float y,
float r, float dr,
int step,
int begin, int end
) {
constexpr auto mod = Fineness + 1;
for (int i = begin; step && i != end; i = (i + (2 * IsClockwise - 1) + mod) % mod, --step) {
float angle = static_cast<float>(i) / Fineness * pi * 2;
float angleNext = static_cast<float>(i + 1) / Fineness * pi * 2;

glVertex3f(dr * std::sin(angle) + x, dr * std::cos(angle) + y, 0.f);
glVertex3f(r * std::sin(angle) + x, r * std::cos(angle) + y, 0.f);
glVertex3f(r * std::sin(angleNext) + x, r * std::cos(angleNext) + y, 0.f);

glVertex3f(dr * std::sin(angle) + x, dr * std::cos(angle) + y, 0.f);
glVertex3f(dr * std::sin(angleNext) + x, dr * std::cos(angleNext) + y, 0.f);
glVertex3f(r * std::sin(angleNext) + x, r * std::cos(angleNext) + y, 0.f);
}
}

static void render() {
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(0.0f, 0.5f, 0.0f);
glColor3f(0.0f, 1.0f, 0.0f);
glVertex3f(-0.5f, -0.5f, 0.0f);
glColor3f(0.0f, 0.0f, 1.0f);
glVertex3f(0.5f, -0.5f, 0.0f);
constexpr float r = 0.3f, dr = 0.15f;
float xDown = std::sqrt(3.f) * 0.25f;

static int cntR = 0, cntG = 0, cntB = 0, tmp = 0; // 控制动画和间隔时间

glColor3f(1.f, 0.f, 0.f);
showRound<false>(0.f, 0.5f, r, dr, cntR,
getShowRoundPercentage(150), getShowRoundPercentage(210));

glColor3f(0.f, 1.f, 0.f);
showRound<false>(-xDown, -0.25f, r, dr, cntG,
getShowRoundPercentage(30), getShowRoundPercentage(90));

glColor3f(0.f, 0.f, 1.f);
showRound<false>(xDown, -0.25f, r, dr, cntB,
getShowRoundPercentage(330), getShowRoundPercentage(30));

constexpr int MaxStep = static_cast<int>(Fineness / 360.f * (360 - 60));

if (++cntR > MaxStep
&& ++cntG > MaxStep
&& ++cntB > MaxStep
&& ++tmp > MaxStep
) {
cntR = cntG = cntB = tmp = 0;
}

CHECK_GL(glEnd());
/* glBegin(GL_TRIANGLES); */
/* constexpr int n = 100; */
/* constexpr float pi = 3.1415926535897f; */
/* float radius = 0.5f; */
/* float inner_radius = 0.25f; */
/* static int x = 0; */
/* x++; */
/* if (x > n) */
/* x -= n; */
/* for (int i = 0; i < x; i++) { */
/* float angle = i / (float)n * pi * 2; */
/* float angle_next = (i + 1) / (float)n * pi * 2; */
/* glVertex3f(0.0f, 0.0f, 0.0f); */
/* glVertex3f(radius * sinf(angle), radius * cosf(angle), 0.0f); */
/* glVertex3f(radius * sinf(angle_next), radius * cosf(angle_next), 0.0f); */
/* glVertex3f(inner_radius * sinf(angle), inner_radius * cosf(angle), 0.0f); */
/* glVertex3f(inner_radius * sinf(angle_next), inner_radius * cosf(angle_next), 0.0f); */
/* glVertex3f(inner_radius * sinf(angle), inner_radius * cosf(angle), 0.0f); */
/* glVertex3f(radius * sinf(angle_next), radius * cosf(angle_next), 0.0f); */
/* } */
/* CHECK_GL(glEnd()); */
}

int main() {
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