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完成作业，画openGL的LOGO图 #34

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完成作业，画openGL的LOGO图 #34

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67 changes: 67 additions & 0 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,74 @@
#include <cstring>
#include <cstdlib>

struct pos {
float x;
float y;
};

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

struct skipIndex {
int small;
int big;
};


static void drawLogo(const pos& pos,const color& color,const skipIndex& skip) {
constexpr int n = 100;

glColor3f(color.r, color.g, color.b);
glBegin(GL_TRIANGLES);

constexpr float pi = 3.1415926535897f;
float radius = 0.3f;
float inner_radius = 0.15f;

bool twoPart = false;
skipIndex sk1 = skip;
skipIndex sk2 = skipIndex{ 0, 0 };
if (skip.small > skip.big) {
sk1.big = 100;
sk2.small = 0;
sk2.big = skip.big;

twoPart = true;
}

for (int i = 0; i < n; i++) {
if (i <= sk1.big && i >= sk1.small) {
continue;
}

if (twoPart && i < sk2.big && i >= sk2.small) {
continue;
}

float angle = i / (float)n * pi * 2;
float angle_next = (i + 1) / (float)n * pi * 2;

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

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

}
CHECK_GL(glEnd());
}

static void render() {
drawLogo(pos{ 0.0f,0.5f }, color{ 1.0f,0.0f,0.0f }, skipIndex{40,60});
drawLogo(pos{ -0.5f,-0.25f }, color{ 0.0f,1.0f,0.0f }, skipIndex{ 10,24 });
drawLogo(pos{ 0.5f,-0.25f }, color{ 0.0f,0.0f,1.0f }, skipIndex{90,10 });
}
static void render2() {
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(0.0f, 0.5f, 0.0f);
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