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hw01 旋转的OpenCV #45

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hw01 旋转的OpenCV #45

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2e92a24
hw01 render OpenCV icon
xyn1201 Aug 24, 2023
2c28b2f
hw01 modify const int to float
xyn1201 Aug 24, 2023
49ff127
hw01 rotational OpenCV v1.0
xyn1201 Aug 24, 2023
bdd910d
hw01 rotated OpenCV icon v1.1
xyn1201 Aug 25, 2023
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113 changes: 84 additions & 29 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,35 +8,90 @@
#include <cstdlib>

static void render() {
////render triangle
//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);
//CHECK_GL(glEnd());

//// render concentric circle
// glBegin(GL_TRIANGLES);
// constexpr int n = 5000;
// 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());

// render OpenCV icon
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);
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()); */
constexpr int n = 5000;
constexpr float pi = 3.1415926535897f;
float radius = 0.3f;
float inner_radius = 0.12f;
float x = 0, y = 0;
float start = 0, end = 0;
static glm::vec3 bound = glm::vec3(0.0f, 0.0f, 0.0f);

for (int count = 0; count < 3; count++) {
switch (count) {
case 0: x = 0.0f , y = 0.4f , end = 150.0f / 360.0f * n, start = 210.0f / 360.0f * n, bound.x += 1.0f; break;
case 1: x = -0.4f * cosf(30.0f / 360.0f * 2 * pi), y = -0.4f * sinf(30.0f / 360.0f * 2 * pi), end = 30.0f / 360.0f * n , start = 90.0f / 360.0f * n , bound.y += 1.0f; break;
case 2: x = 0.4f * cosf(30.0f / 360.0f * 2 * pi), y = -0.4f * sinf(30.0f / 360.0f * 2 * pi), end = 330.0f / 360.0f * n, start = 30.0f / 360.0f * n , bound.z += 1.0f; break;
}

// red/green
if ((start > end) && (bound[count] > n + end))
bound[count] -= (n);
// blue
else if ((start <= end) && (bound[count] > end))
bound[count] -= (n);


for (float i = start; i < bound[count]; i++) {
float angle = i / (float)n * pi * 2;
float angle_next = (i + 1) / (float)n * pi * 2;

switch (count) {
case 0: glColor3f(1.0f, 0.0f, 0.0f); break;
case 1: glColor3f(0.0f, 1.0f, 0.0f); break;
case 2: glColor3f(0.0f, 0.0f, 1.0f); break;
}

// blue circle or red/green one
if ((start <= end) ? (i < start || i > end) : (i < start && i > end))
glColor3f(0.0f, 0.0f, 0.0f);

glVertex3f(radius * sinf(angle) + x, radius * cosf(angle) + y, 0.0f);
glVertex3f(radius * sinf(angle_next) + x, radius * cosf(angle_next) + y, 0.0f);
glVertex3f(inner_radius * sinf(angle) + x, inner_radius * cosf(angle) + y, 0.0f);

glVertex3f(inner_radius * sinf(angle_next) + x, inner_radius * cosf(angle_next) + y, 0.0f);
glVertex3f(inner_radius * sinf(angle) + x, inner_radius * cosf(angle) + y, 0.0f);
glVertex3f(radius * sinf(angle_next) + x, radius * cosf(angle_next) + y, 0.0f);
}
}
CHECK_GL(glEnd());
}

int main() {
Expand All @@ -61,7 +116,7 @@ int main() {
}

// Create window
GLFWwindow *window = glfwCreateWindow(640, 640, "Example", NULL, NULL);
GLFWwindow *window = glfwCreateWindow(640, 640, "draw rotated OpenCV icon", NULL, NULL);
if (!window) {
const char *errmsg;
glfwGetError(&errmsg);
Expand Down