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"opengl作业第一课opencv的logo" #52

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"opengl作业第一课opencv的logo" #52

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94 changes: 65 additions & 29 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,36 +7,72 @@
#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);

constexpr float g3 = 1.7320508075688f; // 根号3
constexpr float pi = 3.1415926535897f;

void setColor(int j)
{
if (j == 0)
glColor3f(1.0f, 0.0f, 0.0f);
else if (j == 1)
glColor3f(0.0f, 1.0f, 0.0f);
else if (j == 2)
glColor3f(0.0f, 0.0f, 1.0f);
}

bool missingAngle(int j, float angle){
if (j == 0)
if (angle > (pi * 5 / 6) && angle < (pi * 7 / 6))
return true;
else
return false;
else if (j == 1)
if (angle > (pi / 6) && angle < (pi / 2))
return true;
else
return false;
else if (j == 2)
if (angle > (pi / 6 * 11) || angle < (pi / 6))
return true;
else return false;
return false;
}

static void render()
{
glBegin(GL_TRIANGLES); // 开始画图, 画图模式，这里是点模式还有线模式

constexpr int n = 200;

float radius = g3 / 4 - 0.05;
float inner_radius = radius * 2 / 5;
float offset[3][3] = {
{0.0f, 0.5f, 0.0f},
{-(g3 / 4), -0.25f, 0.0f},
{g3 / 4, -0.25f, 0.0f},
};
for (int j = 0; j < 3; j++)
{
for (int i = 0; i < n; i++)
{
float angle = i / (float)n * pi * 2;
float angle_next = (i + 1) / (float)n * pi * 2;
if (missingAngle(j, angle))
continue;
setColor(j);

glVertex3f(offset[j][0] + radius * sinf(angle), offset[j][1] + radius * cosf(angle), 0.0f);
glVertex3f(offset[j][0] + inner_radius * sinf(angle), offset[j][1] + inner_radius * cosf(angle), 0.0f);
glVertex3f(offset[j][0] + inner_radius * sinf(angle_next), offset[j][1] + inner_radius * cosf(angle_next), 0.0f);

glVertex3f(offset[j][0] + radius * sinf(angle), offset[j][1] + radius * cosf(angle), 0.0f);
glVertex3f(offset[j][0] + inner_radius * sinf(angle_next), offset[j][1] + inner_radius * cosf(angle_next), 0.0f);
glVertex3f(offset[j][0] + radius * sinf(angle_next), offset[j][1] + radius * 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()); */
}

int main() {
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