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作业1:draw opencv icon #19

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作业1:draw opencv icon #19

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63 changes: 32 additions & 31 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,36 +7,35 @@
#include <cstring>
#include <cstdlib>

constexpr float pi = 3.1415926535897f;

void drawRing(float tran_x, float tran_y, float angle_start, float angle_end){
glBegin(GL_TRIANGLES);
constexpr int n = 100;
float radius = 0.3f;
float inner_radius = 0.15f;
for (int i = 0; i < n; i++) {
float angle = angle_start + i / (float)n * (angle_end - angle_start );
float angle_next = angle_start + (i + 1) / (float)n * (angle_end - angle_start );
glVertex3f(tran_x + radius * sinf(angle), tran_y + radius * cosf(angle), 0.0f);
glVertex3f(tran_x + radius * sinf(angle_next), tran_y + radius * cosf(angle_next), 0.0f);
glVertex3f(tran_x + inner_radius * sinf(angle), tran_y + inner_radius * cosf(angle), 0.0f);

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


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);
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()); */
glColor3f(1.0f,0.0,0.0);
drawRing(0,0.5,(7/ 6.f) * pi,(17/ 6.f) * pi);
glColor3f(0.0f,1.0,0.0);
drawRing(0.5*cosf(7/6.f*pi),0.5*sinf(7/6.f*pi),(1/ 2.f) * pi,(13/ 6.f) * pi);
glColor3f(0.0f,0.0,1.0);
drawRing(0.5*cosf(11/6.f*pi),0.5*sinf(11/6.f*pi),(1/ 6.f) * pi,(11/6.f) * pi);
}

int main() {
Expand All @@ -53,6 +52,8 @@ int main() {
glfwWindowHint(GLFW_OPENGL_API, GLFW_OPENGL_API);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, version / 10);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, version % 10);
glfwWindowHint(GLFW_SAMPLES, 8);

if (version >= 33) {
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#ifdef __APPLE__
Expand Down Expand Up @@ -103,8 +104,8 @@ int main() {
CHECK_GL(glEnable(GL_BLEND));
CHECK_GL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
CHECK_GL(glPointSize(64.0f));

// start main game loop
CHECK_GL(glEnable(GL_MULTISAMPLE));
// start main game loop
while (!glfwWindowShouldClose(window)) {
// render graphics
CHECK_GL(glClear(GL_COLOR_BUFFER_BIT));
Expand Down