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画太极 #16

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画太极 #16

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221 changes: 194 additions & 27 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6,37 +6,204 @@
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <vector>

constexpr float PI = 3.1415926535897f;

float DigToPI(float dig)
{
return dig / 360.f * 2 * PI;
}

struct Point
{
float x;
float y;
float z;
};

struct Color
{
float r;
float g;
float b;
};

struct Triangle
{
Point vertexes[3];
Color color;
};


static std::vector<Triangle> SpawnTaiji()
{
std::vector<Triangle> res;
// ��ɫ
float radius = 0.75f;
for (int i = 0; i < 360; i++)
{
int ni = i + 1;
float angle = DigToPI(i);
float angleNext = DigToPI(ni);

if (i >= 0 && i < 90)
{
// ȫ��
Triangle t;
t.color = {1.0f, 1.0f, 1.0f};
t.vertexes[0] = { 0.0f, 0.0f, 0.0f };
t.vertexes[1] = { radius * sinf(angle), radius * cosf(angle), 0.0f };
t.vertexes[2] = { radius * sinf(angleNext), radius * cosf(angleNext), 0.0f };
res.push_back(t);
}

if (i >= 90 && i < 180)
{
float angleSemi = DigToPI(180.f - 2 * (180.f - i));
float angleSemiN = DigToPI(180.f - 2 * (180.f - ni));
float radiusSemi = radius / 2;

// �׵�
{
Triangle t;
t.color = { 1.0f, 1.0f, 1.0f };
t.vertexes[0] = { 0.0f, 0.0f, 0.0f };
t.vertexes[1] = { radius * sinf(angle), radius * cosf(angle), 0.0f };
t.vertexes[2] = { radius * sinf(angleNext), radius * cosf(angleNext), 0.0f };
res.push_back(t);
}
// ���Բ
{
Triangle t;
t.color = { 1.0f, 0.0f, 0.0f };
t.vertexes[0] = { 0.0f, 0.0f, 0.0f };
t.vertexes[1] = { radiusSemi * sinf(angleSemi), radiusSemi * cosf(angleSemi) - radiusSemi, 0.0f };
t.vertexes[2] = { radiusSemi * sinf(angleSemiN), radiusSemi * cosf(angleSemiN) - radiusSemi, 0.0f };
res.push_back(t);
}
}

if (i >= 180 && i < 270)
{
// ȫ��
{
Triangle t;
t.color = { 1.0f, 0.0f, 0.0f };
t.vertexes[0] = { 0.0f, 0.0f, 0.0f };
t.vertexes[1] = { radius * sinf(angle), radius * cosf(angle), 0.0f };
t.vertexes[2] = { radius * sinf(angleNext), radius * cosf(angleNext), 0.0f };
res.push_back(t);
}
}

if (i >= 270 && i < 360)
{
float angleSemi = DigToPI(180.f - 2 * (360 - i) + 180.f);
float angleSemiN = DigToPI(180.f - 2 * (360 - ni) + 180.f);
float radiusSemi = radius / 2;

// ���
{
Triangle t;
t.color = { 1.0f, 0.0f, 0.0f };
t.vertexes[0] = { 0.0f, 0.0f, 0.0f };
t.vertexes[1] = { radius * sinf(angle), radius * cosf(angle), 0.0f };
t.vertexes[2] = { radius * sinf(angleNext), radius * cosf(angleNext), 0.0f };
res.push_back(t);
}

// �װ�Բ
{
Triangle t;
t.color = { 1.0f, 1.0f, 1.0f };
t.vertexes[0] = { 0.0f, 0.0f, 0.0f };
t.vertexes[1] = { radiusSemi * sinf(angleSemi), radiusSemi * cosf(angleSemi) + radiusSemi, 0.0f };
t.vertexes[2] = { radiusSemi * sinf(angleSemiN), radiusSemi * cosf(angleSemiN) + radiusSemi, 0.0f };
res.push_back(t);
}
}
}

// ����Բ
float radiusSmall = radius / 4;
for (int i = 0; i < 360; i++)
{
int ni = i + 1;
float angle = DigToPI(i);
float angleNext = DigToPI(ni);

// ȫ��
{
Triangle t;
t.color = { 1.0f, 0.0f, 0.0f };
t.vertexes[0] = { 0.0f, radius / 2, 0.0f };
t.vertexes[1] = { radiusSmall * sinf(angle), radiusSmall * cosf(angle) + radius / 2, 0.0f };
t.vertexes[2] = { radiusSmall * sinf(angleNext), radiusSmall * cosf(angleNext) + radius / 2, 0.0f };
res.push_back(t);
}

// ȫ��
{
Triangle t;
t.color = { 1.0f, 1.0f, 1.0f };
t.vertexes[0] = { 0.0f, -radius / 2, 0.0f };
t.vertexes[1] = { radiusSmall * sinf(angle), radiusSmall * cosf(angle) - radius / 2, 0.0f };
t.vertexes[2] = { radiusSmall * sinf(angleNext), radiusSmall * cosf(angleNext) - radius / 2, 0.0f };
res.push_back(t);
}
}

return res;
}

static std::vector<Triangle> taiji = SpawnTaiji();

Point Rotate(const Point& in, Point o, float d)
{
float dPi = DigToPI(d);
Point r;
r.x = in.x * cosf(dPi) - in.y * sinf(dPi);
r.y = in.x * sinf(dPi) + in.y * cosf(dPi);
r.z = in.z;

return r;
}

Triangle Rotate(const Triangle& in, Point o, float d)
{
Triangle r;

r.color = in.color;

r.vertexes[0] = Rotate(in.vertexes[0], o, d);
r.vertexes[1] = Rotate(in.vertexes[1], o, d);
r.vertexes[2] = Rotate(in.vertexes[2], o, d);

return r;
}

int rot = 0;

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);

if (rot > 360)
{
rot = 0;
}
rot++;

for (const auto& triangle : taiji)
{
auto newTriangle = Rotate(triangle, Point{ 0, 0, 0 }, rot);
glColor3f(newTriangle.color.r, newTriangle.color.g, newTriangle.color.b);
glVertex3f(newTriangle.vertexes[0].x, newTriangle.vertexes[0].y, newTriangle.vertexes[0].z);
glVertex3f(newTriangle.vertexes[1].x, newTriangle.vertexes[1].y, newTriangle.vertexes[1].z);
glVertex3f(newTriangle.vertexes[2].x, newTriangle.vertexes[2].y, newTriangle.vertexes[2].z);
}

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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