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作业01 #17

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作业01 #17

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32ac826
opencv logo
wmrunning Jun 27, 2023
dad3a42
opencv logo
wmrunning Jun 27, 2023
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47 changes: 47 additions & 0 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,51 @@
#include <cstring>
#include <cstdlib>

#include <array>

static void draw_logo_element(float pi, float radius, float inner_radius, float angle_correction, std::array<float, 3> center, std::array<float, 3> color) {
constexpr int n = 100;
glBegin(GL_TRIANGLES);
for (int i = 0; i < n; ++i) {
float angle = i / (float)n * pi * 2;
float next_angle = (i + 1) / (float)n * pi * 2;
if (angle > 5.0f / 6 * pi && angle < 7.0f / 6 * pi)
continue;
angle += angle_correction;
next_angle += angle_correction;

glColor3f(color[0], color[1], color[2]);
glVertex3f(center[0] + inner_radius * sinf(angle), center[1] + inner_radius * cosf(angle), 0.0f);
glVertex3f(center[0] + radius * sinf(angle), center[1] + radius * cosf(angle), 0.0f);
glVertex3f(center[0] + radius * sinf(next_angle), center[1] + radius * cosf(next_angle), 0.0f);

glVertex3f(center[0] + inner_radius * sinf(angle), center[1] + inner_radius * cosf(angle), 0.0f);
glVertex3f(center[0] + inner_radius * sinf(next_angle), center[1] + inner_radius * cosf(next_angle), 0.0f);
glVertex3f(center[0] + radius * sinf(next_angle), center[1] + radius * cosf(next_angle), 0.0f);
}
CHECK_GL(glEnd());
}

static void draw_logo() {
constexpr float pi = 3.1415926535897f;
float radius = 0.25f;
float inner_radius = 0.125f;
// edge length of the regular triangle with the three circle centers as vertices
float edge = 2 * radius + 0.065f;

float g_angle_corr = 8.0f / 6 * pi;
float g_y = -edge* sinf(pi / 3) * 1.0f / 3;
float g_x = edge / -2.0f;
float r_y = 2.0f * -g_y;
float b_x = -g_x;

draw_logo_element(pi, radius, inner_radius, 0.0f, { 0.0f, r_y, 0.0f }, { 1.0f, 0.0f, 0.0f });
draw_logo_element(pi, radius, inner_radius, g_angle_corr, { g_x, g_y, 0.0f }, { 0.0f, 1.0f, 0.0f });
draw_logo_element(pi, radius, inner_radius, pi, { b_x, g_y, 0.0f }, { 0.0f, 0.0f, 1.0f });
}

static void render() {
#if 0
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(0.0f, 0.5f, 0.0f);
Expand All @@ -16,6 +60,7 @@ static void render() {
glColor3f(0.0f, 0.0f, 1.0f);
glVertex3f(0.5f, -0.5f, 0.0f);
CHECK_GL(glEnd());
#endif
/* glBegin(GL_TRIANGLES); */
/* constexpr int n = 100; */
/* constexpr float pi = 3.1415926535897f; */
Expand All @@ -37,6 +82,8 @@ static void render() {
/* glVertex3f(radius * sinf(angle_next), radius * cosf(angle_next), 0.0f); */
/* } */
/* CHECK_GL(glEnd()); */

draw_logo();
}

int main() {
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