update

src/c1/circle.cpp

@@ -0,0 +1,114 @@
+//circle.cpp
+
+#include <cmath>
+#include <cstdlib>
+#include <format>
+#include<glad/glad.h>
+#include<GLFW/glfw3.h>
+#include <chrono>
+#include <iostream>
+#include <numbers>
+#include <ostream>
+#include <stdexcept>
+#include <thread>
+
+const float POINT_SIZE = 32.0f;
+const unsigned int F_PER_SECOND = 144;
+const float PI = 3.141592653589793238462643383279502884L;
+
+typedef  unsigned int u8;
+
+#ifdef NDEBUG
+    #define PRINT(v)
+#else
+    #define PRINT(v){std::cout<<std::format("{} : {}\n",#v,(v));}
+#endif
+
+
+class BouncyBall{
+public:
+    int bx=0,by=0,bsx=5,bsy=7;
+    BouncyBall(int x,int y,int speedX,int speedY):bx(x),by(y),bsx(speedX),bsy(speedY){}
+    BouncyBall* update(){
+        bx+=bsx,by+=bsy;
+        if(bx>=1000||bx<=-1000){
+            bsx=-bsx;
+        }
+        if(by>=1000||by<=-1000){
+            bsy=-bsy;
+        }
+        return this;
+    }
+};
+
+float angleToRad(float angle){
+    return angle/180*PI;
+}
+
+void render(){
+    glBegin(GL_TRIANGLES);
+        static int state  = -1;
+        state=(state+1)%F_PER_SECOND;
+        const u8 anglePerCircle = 1;
+        static float circleSize = 0.1f;
+        if(state==0){
+            circleSize+=0.1f;
+        }
+        if(circleSize>1.0f){
+            circleSize=0.1f;
+        }
+        for (u8 i=0;i<u8(float(state)/120.0f*360.0f);i+=anglePerCircle) {
+            if(i==0){
+                glVertex3f(std::cos(angleToRad(i))*circleSize,std::sin(angleToRad(i))*circleSize,0.0f);
+            }else[[likely]]{
+                glVertex3f(std::cos(angleToRad(i))*circleSize,std::sin(angleToRad(i))*circleSize,0.0f);
+                glVertex3f(std::cos(angleToRad(i))*circleSize,std::sin(angleToRad(i))*circleSize,0.0f);
+            }
+            glVertex3f(0.0f,0.0f,0.0f);
+        }
+    glEnd();
+}
+
+int main(){
+    // 初始化GLFW
+    if(glfwInit()==0){
+        throw std::runtime_error("failed to init GLFW");
+    }
+    GLFWwindow *window = glfwCreateWindow(640,640,"Example",nullptr,nullptr);
+
+    if(window==nullptr){
+        glfwTerminate();
+        throw std::runtime_error("GLFW failed to create window");
+    }
+
+    glfwMakeContextCurrent(window);//创建上下文
+
+    if(gladLoadGL()==0){  //加载GL函数
+        glfwTerminate();
+        throw std::runtime_error("GLAD Load GL functions failed");
+    }
+    
+    std::cout<<"OpenGL version:"<<glGetString(GL_VERSION)<<"\n";
+
+    glEnable(GL_POINT_SMOOTH);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+    glPointSize(POINT_SIZE);
+
+    while(glfwWindowShouldClose(window)==false){
+        glClear(GL_COLOR_BUFFER_BIT);
+        render();
+        glfwSwapBuffers(window);
+        glfwPollEvents();
+        std::this_thread::sleep_for(std::chrono::milliseconds(1000/F_PER_SECOND));
+    }
+    return 0;
+}
+
+#ifdef _MSC_VER 
+#include<Windows.h>
+int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
+    main();
+    return 0;
+}
+#endif

xmake.lua

@@ -19,4 +19,7 @@ target("3Points")
     add_files("src/c1/threePoints.cpp")
 
 target("circlePoints")
-    add_files("src/c1/circlePoints.cpp")
+    add_files("src/c1/circlePoints.cpp")
+
+target("circle")
+    add_files("src/c1/circle.cpp")