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hw01 #15

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26 changes: 23 additions & 3 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,14 +7,34 @@
#include <cstring>
#include <cstdlib>

const int n = 1000;
const float pi = 3.1415926535897f;
const float unit_angle = 2 * pi / n;

void paint_circle(float start_angle, float end_angle, float radius, float inner_radius, float origin_x, float origin_y) {
for (float angle = start_angle; angle < end_angle; angle += unit_angle) {
float angle_next = angle + unit_angle;
glVertex3f(inner_radius * std::cos(angle) + origin_x, inner_radius * std::sin(angle) + origin_y, 0.f);
glVertex3f(radius * std::cos(angle) + origin_x, radius * std::sin(angle) + origin_y, 0.f);
glVertex3f(radius * std::cos(angle_next) + origin_x, radius * std::sin(angle_next) + origin_y, 0.f);

glVertex3f(radius * std::cos(angle_next) + origin_x, radius * std::sin(angle_next) + origin_y, 0.f);
glVertex3f(inner_radius * std::cos(angle) + origin_x, inner_radius * std::sin(angle) + origin_y, 0.f);
glVertex3f(inner_radius * std::cos(angle_next) + origin_x, inner_radius * std::sin(angle_next) + origin_y, 0.f);
}
}

static void render() {
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(0.0f, 0.5f, 0.0f);
paint_circle(-pi / 3, 4 * pi / 3, 0.3f, 0.1f, 0.f, 0.6f);

glColor3f(0.0f, 1.0f, 0.0f);
glVertex3f(-0.5f, -0.5f, 0.0f);
paint_circle(pi / 3, 2 * pi, 0.3f, 0.1f, -0.35f, 0.0f);

glColor3f(0.0f, 0.0f, 1.0f);
glVertex3f(0.5f, -0.5f, 0.0f);
paint_circle(-4 * pi / 3, pi / 3, 0.3f, 0.1f, 0.35f, 0.0f);

CHECK_GL(glEnd());
/* glBegin(GL_TRIANGLES); */
/* constexpr int n = 100; */
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