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adonis的第一次作业 #47

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ab9a3cd
画三角形，OpenCV图标，圆形图腾
adonis747 Sep 13, 2023
99e25e5
补了一下注释
adonis747 Sep 13, 2023
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96 changes: 67 additions & 29 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,62 @@
#include <iostream>
#include <cstring>
#include <cstdlib>
//using namespace std;

static void render() {
//��������ɫ��Բ�����꣬��ʼ������
static void render(float r, float g, float b, float x, float y, float start, float end) {
glBegin(GL_TRIANGLES);
constexpr int n = 1000;
constexpr float pi = 3.1415926535897f;
float radius = 0.4f;//��뾶
float inner_radius = 0.15f;//�ڰ뾶
float limit = n * end;
for (float i = n * start; i < limit; i++) {
float angle = i / (float)n * pi * 2;
float angle_next = (i + 1) / (float)n * pi * 2;
glColor3f(r, g, b);
glVertex3f(radius * sinf(angle) + x, radius * cosf(angle) + y, 0.0f);
glVertex3f(radius * sinf(angle_next) + x, radius * cosf(angle_next) + y, 0.0f);
glVertex3f(inner_radius * sinf(angle) + x, inner_radius * cosf(angle) + y, 0.0f);

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

//--Բͼ��--������ڷ�~�������ε���������3nʱ����ӵ��¸�ѭ����eg:123 412 341 234 ...
static void render_round(){
glBegin(GL_TRIANGLES);
constexpr int n = 1000;//�޸�n��ò�ͬͼ��
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;
glColor3f(1.0f, 1.0f, 1.0f);//��
glVertex3f(0.0f, 0.0f, 0.0f);
glColor3f(1.0f, 0.0f, 1.0f);//��
glVertex3f(radius * sinf(angle), radius * cosf(angle), 0.0f);
glColor3f(1.0f, 1.0f, 0.0f);//��
glVertex3f(radius * sinf(angle_next), radius * cosf(angle_next), 0.0f);
glColor3f(0.0f, 1.0f, 1.0f);//��
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());
}
//---��ɫ����----
static void render_triangle()
{
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(0.0f, 0.5f, 0.0f);
Expand All @@ -16,32 +70,11 @@ static void render() {
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()); */
}

int main() {
if (!glfwInit()) {
const char *errmsg;
if (!glfwInit()) {//��ʼ��
const char* errmsg;
glfwGetError(&errmsg);
if (!errmsg) errmsg = "(no error)";
std::cerr << "failed to initialize GLFW: " << errmsg << '\n';
Expand All @@ -61,18 +94,20 @@ int main() {
}

// Create window
GLFWwindow *window = glfwCreateWindow(640, 640, "Example", NULL, NULL);
GLFWwindow* window = glfwCreateWindow(640, 640, "Example", NULL, NULL);
if (!window) {
const char *errmsg;
const char* errmsg;
glfwGetError(&errmsg);
if (!errmsg) errmsg = "(no error)";
std::cerr << "GLFW failed to create window: " << errmsg << '\n';
std::cerr << "==============================================\n";
if (!strcmp(errmsg, "X11: The DISPLAY environment variable is missing")) {
std::cerr << "You seems not running with graphic display\n";
} else if (!strcmp(errmsg, "WGL: The driver does not appear to support OpenGL")) {
}
else if (!strcmp(errmsg, "WGL: The driver does not appear to support OpenGL")) {
std::cerr << "Please consider install an OpenGL driver, or use the mesa driver\n";
} else if (!strcmp(errmsg, "WGL: Failed to create OpenGL context")) {
}
else if (!strcmp(errmsg, "WGL: Failed to create OpenGL context")) {
std::cerr << "Your driver seems not supporting the required OpenGL version\n";
}
std::cerr << "- If you have a physical graphic card (e.g. NVIDIA), install it from your graphic card vendor official website: http://www.nvidia.com/Download/index.aspx\n";
Expand Down Expand Up @@ -108,7 +143,10 @@ int main() {
while (!glfwWindowShouldClose(window)) {
// render graphics
CHECK_GL(glClear(GL_COLOR_BUFFER_BIT));
render();
render_round();//��Բ
render(1.0f, 0.0f, 0.0f, 0.0f, 0.4f, (float)7 / 12, (float)17 / 12);
render(0.0f, 1.0f, 0.0f, -0.46f, -0.4f, 0.25f, (float)13 / 12);
render(0.0f, 0.0f, 1.0f, 0.46f, -0.4f, (float)1/12, (float)11/12);
// refresh screen
glfwSwapBuffers(window);
glfwPollEvents();
Expand Down