Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

homework1, draw opencv logo with opengl compat. #31

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

homework1, draw opencv logo with opengl compat. #31

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
77 changes: 47 additions & 30 deletions src/main.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,36 +7,53 @@
#include <cstring>
#include <cstdlib>

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);
using vec3 = glm::vec3;
using vec2 = glm::vec2;

void draw_annulas(vec3 center, float outer_radius, float inner_radius, vec3 color, float scale = 1.0f, int subdiv = 100, vec2 gap_range = {0.0f, 0.0f}, bool gap_mask = false) {
// if :gap_mask is true, gap in the :gap_range, else draw in the :gap_range

constexpr float pi = 3.1415926535897f;
float r_o = scale * outer_radius;
float r_i = scale * inner_radius;
const vec3& C = center;
const int& n = subdiv;

int gap_begin = gap_range.x * n;
int gap_end = gap_range.y * n;

glBegin(GL_TRIANGLES);
glColor3f(color.x, color.y, color.z);
for (int i = 0; i < n; i++) {
float angle = i / (float)n * pi * 2;
float angle_next = (i + 1) / (float)n * pi * 2;

if (gap_mask && gap_begin <= i && i < gap_end) {
continue;
} else if (!gap_mask && !(gap_begin <= i && i < gap_end)) {
continue;
}
glVertex3f(C.x + r_o * sinf(angle), C.y + r_o * cosf(angle), 0.0f);
glVertex3f(C.x + r_o * sinf(angle_next), C.y + r_o * cosf(angle_next), 0.0f);
glVertex3f(C.x + r_i * sinf(angle), C.y + r_i * cosf(angle), 0.0f);

glVertex3f(C.x + r_i * sinf(angle_next), C.y + r_i * cosf(angle_next), 0.0f);
glVertex3f(C.x + r_i * sinf(angle), C.y + r_i * cosf(angle), 0.0f);
glVertex3f(C.x + r_o * sinf(angle_next), C.y + r_o * cosf(angle_next), 0.0f);
}
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()); */
}

static void render() {
constexpr float scale_factor = 0.76f;
constexpr int subdiv_number = 120;
constexpr float inner_radius = 0.5f, outer_radius = 0.2f;
constexpr float _short = 0.25f;
vec3 tri_sides = {_short, 2 * _short, _short * sqrtf(3)};

draw_annulas(vec3(0.0f, tri_sides.y, 0.0f), inner_radius, outer_radius, vec3(1.0f, 0.0f, 0.0f), scale_factor, subdiv_number, vec2(0.5f-1.0f/12.0f, 0.5f+1.0f/12.0f), true);
draw_annulas(vec3(-tri_sides.z, -tri_sides.x, 0.0f), inner_radius, outer_radius, vec3(0.0f, 1.0f, 0.0f), scale_factor, subdiv_number, vec2(1.0f/12.0f, 1.0f/4.0f), true);
draw_annulas(vec3(tri_sides.z, -tri_sides.x, 0.0f), inner_radius, outer_radius, vec3(0.0f, 0.0f, 1.0f), scale_factor, subdiv_number, vec2(1.0/12.0f, 1.0f-1.0f/12.0f), false);
}

int main() {
Expand All @@ -61,7 +78,7 @@ int main() {
}

// Create window
GLFWwindow *window = glfwCreateWindow(640, 640, "Example", NULL, NULL);
GLFWwindow *window = glfwCreateWindow(640, 640, "Homework1: OpenCV Logo", nullptr, nullptr);
if (!window) {
const char *errmsg;
glfwGetError(&errmsg);
Expand Down