Static Simple Graphics & Sleep() & srand()
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- 两种五角星画法 homework of Computer Graphic
- 花花的三角形, 点和线的像素宽度, 写字
- 同时出现两个窗口 描边
- 交互式画图
- 国民党旗 共青团徽 自定义边数的花
五角星 可以和下面的五角星对比一下
- 参考模板讲解
// #pragma comment (lib, "opengl32.lib")// #pragma comment (lib, "glu32.lib")// #pragma comment (lib, "glut32.lib")//Windows VC6.0环用#include <GL/glut.h>#include <stdio.h>// #include <windows.h> // Under Windows to Use Sleep(50)#include <unistd.h> // 在gcc编译器中，使用的头文件因gcc版本的不同而不同#include <stdlib.h>#include <time.h>#include <iostream>#include <math.h>using namespace std;const double PI = acos(-1.0);float pCenter[] = {200.0, 200.0}; //五角星中心点坐标float Length = 100;float angle = 0; //五角星便宜正方向的角度float R, G, B;void myDraw(GLfloat Pos[2], GLfloat Length, GLfloat theta) //Pos[2]=五角星坐标,Length=五角星大圆半径{ glBegin(GL_LINE_LOOP); //float Short = Length * (2 - 2 * cos(0.2 * PI)); //Wiki: 五角星 红色/蓝色 = 蓝色/绿色 可以找到大小圆半径的关系 float Short = Length * sin(0.1 * PI) / sin(0.7 * PI); float beta = 18 + theta; //五角星NE的长半径和x轴的夹角 float p1[2]; glColor3f(R, G, B); for (int i = 0; i < 5; i++) //从最右边的那个长边顶点开始画 { p1[0] = Length * cos(i * 2 * 0.2 * PI + beta * 3.1415926 / 180.0) + Pos[0]; //x坐标 18 * 3.1415926 = 56.55 p1[1] = Length * sin(i * 2 * 0.2 * PI + beta * 3.1415926 / 180.0) + Pos[1]; //y坐标 glVertex2fv(p1); p1[0] = Short * cos((i * 2 + 1) * 0.2 * PI + beta * 3.1415926 / 180.0) + Pos[0]; p1[1] = Short * sin((i * 2 + 1) * 0.2 * PI + beta * 3.1415926 / 180.0) + Pos[1]; glVertex2fv(p1); } glEnd();}void display(){ glClearColor(0, 1.0, 0, 0); glClear(GL_COLOR_BUFFER_BIT); // Sleep(50); // Windows <windows.h> unsigned Sleep(unsigned millon_seconds); // sleep(1); // <unistd.h> unsigned sleep(unsigned seconds); usleep(100000); // <unistd.h> void usleep(int micro_seconds); srand(time(NULL)); for(int k = 0; k < 10; k++) { float i; i = rand() % 400 + 1; /* i是[1，200]区间内的一个整数 */ pCenter[0] = (float)i; //srand(time(NULL)); //这里不能写，否则会生成相同的 i = rand() % 200 + 1; pCenter[1] = (float)i; //srand(time(NULL)); i = rand() % 200; i = rand() % 200 + 1; R = i / 200; //srand(time(NULL)); i = rand() % 200 + 1; G = i / 200; //srand(time(NULL)); i = rand() % 200 + 1; B = i / 200; //srand(time(NULL)); i = rand() % 200 + 1; angle += i; Length = (float)i; myDraw(pCenter, Length, angle); //printf("%f\n", i); } glFlush();}void Reshape(int w, int h) { display();}void randomChange() { display();}int main(int argc, char* argv[]){ glutInit(&argc, argv); glutInitDisplayMode(GLUT_DEPTH | GLUT_SINGLE | GLUT_RGB); glutInitWindowSize(400, 400); glutInitWindowPosition(300, 300); glutCreateWindow("coder352"); gluOrtho2D(0, 400, 0, 400); glutDisplayFunc(display); //glutReshapeFunc(Reshape); glutIdleFunc(randomChange); glutMainLoop(); return 0;}glBegin画各种图形 圆 五角星 菱形 三角形
- 参考模板讲解
#include<GL/glut.h>#include<math.h>const GLfloat R = 0.8f;const GLfloat PI = 3.1415926536f;const int n = 600;void basicshape2(){ int i; glClearColor(1.0, 1.0, 0.0, 0.8); glClear(GL_COLOR_BUFFER_BIT); /* ---------------------- ----------------------*/ glLineWidth(3); glBegin(GL_LINE_LOOP); //以闭合折线方式画圆 glColor3f(1.0f, 0.0f, 0.0f); for (i = 0; i < n; ++i) glVertex2f(R * cos(2 * PI / n * i), R * sin(2 * PI / n * i)); glEnd(); /* ---------------------- ----------------------*/ glBegin(GL_LINE_LOOP); //以闭合折线方式画五角星 glColor3f(0.0f, 1.0f, 0.0f); GLfloat bx = R * cos(18 * PI / 180); GLfloat by = R * sin(18 * PI / 180); GLfloat cx = R * sin(36 * PI / 180); GLfloat cy = R * cos(36 * PI / 180); glVertex2f(-bx, by); glVertex2f(bx, by); glVertex2f(-cx, -cy); glVertex2f(0.0f, R); glVertex2f(cx, -cy); glEnd(); /* ---------------------- ----------------------*/ glBegin(GL_POLYGON); //以填充方式画菱形,多边形，五角星也是可以的啦~ glVertex2f(-0.8f, 0.95f); glVertex2f(-0.7f, 0.85f); glVertex2f(-0.8f, 0.75f); glVertex2f(-0.9f, 0.85f); glEnd(); glBegin(GL_POLYGON); //对称一下 glVertex2f(0.8f, 0.95f); glVertex2f(0.7f, 0.85f); glVertex2f(0.8f, 0.75f); glVertex2f(0.9f, 0.85f); glEnd(); //这里有两个菱形，可以用GL_QUADS一次搞定，独立的~ /* ---------------------- ----------------------*/ glColor3f(0.0f, 0.0f, 1.0f); glBegin(GL_TRIANGLES); //两个三角形 glVertex2f(-1.0f, -1.0f); glVertex2f(-0.95f, -0.7f); glVertex2f(-0.8f, -0.7f); glVertex2f(-1.0f, -1.0f); glVertex2f(-0.8f, -0.75f); glVertex2f(-0.8f, -0.95f); glEnd(); /* ---------------------- ----------------------*/ glFlush(); //最后flush一下}int main(int argc, char *argv[]){ glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(150, 150); glutInitWindowSize(500, 500); glutCreateWindow("Baisc Shape2"); glutDisplayFunc(basicshape2); glutMainLoop(); return 0;}小图形
- 花花的三角形, 点和线的像素宽度, 写字
#include<GL/glut.h>#pragma comment(linker,"/subsystem:\"windows\" /entry:\"mainCRTStartup\"")void mydisplay(void){ glClearColor(0.0, 1.0, 0.0, 0.0); //设置背景为绿色 glClear(GL_COLOR_BUFFER_BIT); //在左上角画一个黄色的矩形 glColor3f(1.0f, 1.0f, 0.0f); glRectf(-0.9f, 0.0f, 0.0f, 0.9f); //分别是左下角和右上角两点坐标 //在右上角画一个花花的三角形 glBegin(GL_TRIANGLES); glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(0.9f, 0.0f); glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(0.5f, 0.6f); glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(0.1f, 0.0f); glEnd(); //画两个点 glPointSize(5); //表示点的像素 glBegin(GL_POINTS); glColor3f(0.0f, 0.0f, 0.0f); glVertex2f(0.05f, 0.0f); glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(0.05f, -0.5f); glEnd(); //写一个我的"可"字 glLineWidth(5); //表示线的宽度 glBegin(GL_LINES); glColor3f(1.0f, 1.0f, 0.0f); glVertex2f(0.5f, -0.5f); glColor3f(1.0f, 1.0f, 0.0f); glVertex2f(0.8f, -0.5f); glColor3f(1.0f, 1.0f, 0.0f); glVertex2f(0.75f, -0.5f); glColor3f(1.0f, 1.0f, 0.0f); glVertex2f(0.75f, -0.8f); glEnd(); glColor3f(1.0f, 1.0f, 0.0f); glRectf(0.55f, -0.7f, 0.7f, -0.55f); glFlush();}int main(int argc, char *argv[]){ glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(100, 100); glutInitWindowSize(600, 600); glutCreateWindow("Basic Shape"); glutDisplayFunc(mydisplay); glutMainLoop(); return 0;}升级2 更加对称的图形
- 同时出现两个窗口 描边
#include<GL/glut.h>#include<math.h>#pragma comment(linker,"/subsystem:\"windows\" /entry:\"mainCRTStartup\"")const float R1 = 0.8f;const float R2 = 0.4f;const float PI = 3.1415926;void myDisplay_1(){ glClearColor(1.0f, 1.0f, 1.0f, 0.0f); glClear(GL_COLOR_BUFFER_BIT); //*****下面开始画矩形和三角形 glColor3f(1.0f, 0.0f, 0.0f); glBegin(GL_POLYGON); glVertex2f(0.4f, 0); glVertex2f(0, 0.4f); glVertex2f(-0.4f, 0); glVertex2f(0, -0.4f); glEnd(); glBegin(GL_TRIANGLES); //四个三角形 glColor3f(1.0f, 1.0f, 0.0f); glVertex2f(0.4f, -0.4f); glVertex2f(0.8f, 0); glVertex2f(0.4f, 0.4f); glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(0.4f, 0.4f); glVertex2f(-0.4f, 0.4f); glVertex2f(0, 0.8f); glColor3f(1.0f, 0.0f, 1.0f); glVertex2f(-0.4f, 0.4f); glVertex2f(-0.4f, -0.4f); glVertex2f(-0.8f, 0); glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(-0.4f, -0.4f); glVertex2f(0.4f, -0.4f); glVertex2f(0, -0.8f); glEnd(); //******描边 glColor3f(0.0f, 0.0f, 0.0f); glBegin(GL_LINE_LOOP); glVertex2f(0.4f, 0); //矩形的边 glVertex2f(0, 0.4f); glVertex2f(-0.4f, 0); glVertex2f(0, -0.4f); glEnd(); glBegin(GL_LINE_LOOP);//三角形的边,可当作两个矩形 glVertex2f(0.8f, 0); glVertex2f(0.4f, -0.4f); glVertex2f(0, -0.8f); glVertex2f(-0.4f, -0.4f); glVertex2f(-0.8f, 0); glVertex2f(-0.4f, 0.4f); glVertex2f(0, 0.8f); glVertex2f(0.4f, 0.4f); glVertex2f(0.4f, -0.4f); glVertex2f(-0.4f, -0.4f); glVertex2f(-0.4f, 0.4f); glVertex2f(0.4f, 0.4f); glEnd(); glFlush();}void myDisplay_2(){ glClearColor(1.0f, 1.0f, 1.0f, 0.0f); glClear(GL_COLOR_BUFFER_BIT); for (int i = 0; i <= 270; i += 90) { glColor3f(1.0f, 0.0f, 0.0f); glBegin(GL_POLYGON); glVertex2f(R1 * cos(i * PI / 180), R1 * sin(i * PI / 180)); glVertex2f(R2 * cos((i + 25)*PI / 180), R2 * sin((i + 25)*PI / 180)); glVertex2f(0, 0); glVertex2f(R2 * cos((i - 25)*PI / 180), R2 * sin((i - 25)*PI / 180)); glEnd(); glColor3f(0.0f, 0.0f, 0.0f); glBegin(GL_LINE_LOOP); glVertex2f(R1 * cos(i * PI / 180), R1 * sin(i * PI / 180)); glVertex2f(R2 * cos((i + 25)*PI / 180), R2 * sin((i + 25)*PI / 180)); glVertex2f(0, 0); glVertex2f(R2 * cos((i - 25)*PI / 180), R2 * sin((i - 25)*PI / 180)); glEnd(); } for (int i = 45; i <= 315; i += 90) { glColor3f(0.0f, 1.0f, 0.0f); glBegin(GL_POLYGON); glVertex2f(R1 * cos(i * PI / 180), R1 * sin(i * PI / 180)); glVertex2f(R2 * cos((i + 20)*PI / 180), R2 * sin((i + 20)*PI / 180)); glVertex2f(0, 0); glVertex2f(R2 * cos((i - 20)*PI / 180), R2 * sin((i - 20)*PI / 180)); glEnd(); glColor3f(0.0f, 0.0f, 0.0f); glBegin(GL_LINE_LOOP); glVertex2f(R1 * cos(i * PI / 180), R1 * sin(i * PI / 180)); glVertex2f(R2 * cos((i + 20)*PI / 180), R2 * sin((i + 20)*PI / 180)); glVertex2f(0, 0); glVertex2f(R2 * cos((i - 20)*PI / 180), R2 * sin((i - 20)*PI / 180)); glEnd(); } glFlush();}int main(int argc, char * argv[]){ glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(100, 100); glutInitWindowSize(500, 500); glutCreateWindow("sheng2_1"); glutDisplayFunc(myDisplay_1); glutInitWindowPosition(700, 100); glutInitWindowSize(500, 500); glutCreateWindow("sheng2_2"); glutDisplayFunc(myDisplay_2); glutMainLoop(); return 0;}交互式画图
#include<GL/glut.h>#include<stdio.h>int col;int p;void mydisplay(){ glShadeModel(GL_FLAT); glClearColor(0.0f, 1.0f, 1.0f, 0.0f); glClear(GL_COLOR_BUFFER_BIT); glColor3f(0.5f, 0.5f, 0.5f); glRectf(-0.9, -0.9f, -0.7f, -0.7f); switch (col) { case 1: glColor3f(1.0f, 0.0f, 0.0f); break; case 2: glColor3f(0.0f, 1.0f, 0.0f); break; case 3: glColor3f(0.0f, 0.0f, 1.0f); break; case 4: glColor3f(1.0f, 1.0f, 0.0f); break; case 5: glColor3f(1.0f, 0.0f, 1.0f); break; case 6: glColor3f(0.0f, 1.0f, 1.0f); break; default: printf("没有此种颜色!\n"); } glLineWidth(p); glBegin(GL_LINES); glVertex2i(-1.0f, -1.0f); glVertex2i(0, 0); glEnd(); glLineWidth(1); glColor3f(0.0f, 0.0f, 1.0f); glBegin(GL_LINES); glVertex2f(-0.6f, -1.0f); glVertex2f(-0.7f, 0.2f); glEnd(); glPointSize(10); glColor3f(1.0f, 1.0f, 0.0f); glBegin(GL_POINTS); glVertex2f(-1.0f, -1.0f); glEnd(); glFlush();}int main(int argc, char * argv[]){ glutInit(&argc, argv); printf("请选择线的颜色\n"); printf("1.红色 2.绿色 3.蓝色 4.黄色 5.梅红色 6.青色\n"); scanf("%d", &col); printf("请输入线的宽度:\n"); scanf("%d", &p); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(800, 100); glutInitWindowSize(400, 400); glutCreateWindow("jiben2"); glutDisplayFunc(mydisplay); glutMainLoop(); return 0;}国民党旗 共青团徽 自定义边数的花
- 有BUG，待完善
#include<stdio.h>#include<GL/glut.h>#include<math.h>//#pragma comment(linker,"/subsystem:\"windows\" /entry:\"mainCRTStartup\"")const double PI = 3.14159265358979f;const float R = 0.8f;const float R2 = 0.48f;const float R3 = 0.45f;const float R4 = 0.42f;const float r2 = 0.7f;//const float r3 = r2*sin(36*PI/180)*2*0.382;//0.618黄金分割const float r3 = r2 * sin(36 * PI / 180) / sin(72 * PI / 180) * 0.618;int vn;//国民党党旗void GMD(){ glClearColor(1.0f, 1.0f, 1.0f, 0.0f); glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_POLYGON); //画背景的蓝色圆 glColor3f(0.0f, 0.0f, 1.0f); for (float i = 0; i <= 360; i += 0.1) glVertex2f(R * cos(i * PI / 180), R * sin(i * PI / 180)); glEnd(); //画12个顶点的太阳 float p[30][2]; int j = 0; for (int i = 0; i <= 360; i += 30) { p[j][0] = R * cos(i * PI / 180); p[j][1] = R * sin(i * PI / 180); j = j + 2; } j = 1; for (int i = 15; i <= 360; i += 30) { p[j][0] = R2 * cos(i * PI / 180); p[j][1] = R2 * sin(i * PI / 180); j = j + 2; } glLineWidth(2); glColor3f(1.0f, 1.0f, 1.0f); for (j = 1; j <= 23; j++) { //填充 glBegin(GL_POLYGON); glVertex2f(0, 0); glVertex2f(p[abs(j + 1) % 24][0], p[abs(j + 1) % 24][1]); glVertex2f(p[j][0], p[j][1]); glVertex2f(p[abs(j - 1) % 24][0], p[abs(j - 1) % 24][1]); glEnd(); } //画中间的两个圆 glBegin(GL_POLYGON); glColor3f(0.0f, 0.0f, 1.0f); for (int i = 0; i <= 360; i += 0.1) glVertex2f(R3 * cos(i * PI / 180), R3 * sin(i * PI / 180)); glEnd(); glBegin(GL_POLYGON); glColor3f(1.0f, 1.0f, 1.0f); for (int i = 0; i <= 360; i += 0.1) glVertex2f(R4 * cos(i * PI / 180), R4 * sin(i * PI / 180)); glEnd(); glFlush();}//******团徽void GQT(){ glClearColor(1.0f, 1.0f, 1.0f, 0.0f); glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_POLYGON); //画黄色背景圆 glColor3f(1.0f, 1.0f, 0.0f); for (float i = 0; i <= 360; i += 0.1) glVertex2f(R * cos(i * PI / 180), R * sin(i * PI / 180)); glEnd(); glBegin(GL_POLYGON); //画红色背景圆 glColor3f(1.0f, 0.0f, 0.0f); for (int i = 0; i <= 360; i += 0.1) glVertex2f(r2 * cos(i * PI / 180), r2 * sin(i * PI / 180)); glEnd(); float p[10][2]; int j = 0; for (int i = 90; i <= 270; i += 72) { p[j][0] = r2 * cos(i * PI / 180); p[j++][1] = r2 * sin(i * PI / 180); p[j][0] = r3 * cos((i + 36) * PI / 180); p[j][1] = r3 * sin((i + 36) * PI / 180); j++; } j = j--; printf("%d", j); p[6][0] = -p[4][0]; p[6][1] = p[4][1]; p[7][0] = -p[3][0]; p[7][1] = p[3][1]; p[8][0] = -p[2][0]; p[8][1] = p[2][1]; p[9][0] = -p[1][0]; p[9][1] = p[1][1]; glColor3f(1.0f, 1.0f, 0.0f); glBegin(GL_POLYGON); for (j = 9; j >= 0; j--) glVertex2f(p[j][0], p[j][1]); glEnd(); glLineWidth(2); //描边 glColor3f(0.0f, 0.0f, 0.0f); glBegin(GL_LINE_LOOP); for (j = 0; j <= 9; j++) glVertex2f(p[j][0], p[j][1]); glEnd(); //从原点连线 glColor3f(0.0f, 0.0f, 0.0f); for (j = 0; j <= 9; j++) { glBegin(GL_LINES); glVertex2f(0, 0); glVertex2f(p[j][0], p[j][1]); glEnd(); } glFlush();}//****花型图案void Flower(){ glClearColor(1.0f, 1.0f, 1.0f, 0.0f); glClear(GL_COLOR_BUFFER_BIT); double p[201][2]; int j = 0; float add = 180 / (vn / 2 + 0.5); float add2 = add / 2; for (float i = 90; i <= 270; i += add) { p[j][0] = R * cos(i * PI / 180); p[j++][1] = R * sin(i * PI / 180); p[j][0] = R4 * cos((i + add2) * PI / 180); p[j++][1] = R4 * sin((i + add2) * PI / 180); p[j][0] = R4 * cos((i + add2) * PI / 180); p[j--][1] = R4 * sin((i + add2) * PI / 180); } for (int k = j;; k++) { if (j < 0) break; p[k][0] = -p[j][0]; p[k][1] = p[j][1]; j--; } //至此，点全部计算存储完毕~，注意从90度的点开始存储，然后对称右半部分 k--; //画最外边的多边形 glColor3f(1.0f, 0.0f, 1.0f); glBegin(GL_POLYGON); for (j = 0; j <= k; j = j + 2) glVertex2f(p[j][0], p[j][1]); glEnd(); //描多边形的边 glColor3f(0.0f, 0.0f, 0.0f); glBegin(GL_LINE_STRIP); for (j = 0; j <= k; j = j + 2) glVertex2f(p[j][0], p[j][1]); glEnd(); //画角 glColor3f(1.0f, 1.0f, 1.0f); for (j = 0; j <= k; j = j + 2) { glBegin(GL_POLYGON); glVertex2f(0, 0); glVertex2f(p[abs(j + 1) % k][0], p[abs(j + 1) % k][1]); glVertex2f(p[j][0], p[j][1]); glVertex2f(p[abs(j - 1) % k][0], p[abs(j - 1) % k][1]); glEnd(); } //为里面的几个尖角描出边界 glLineWidth(1); glColor3f(0.0f, 0.0f, 0.0f); glBegin(GL_LINE_STRIP); for (j = 0; j <= k; j++) glVertex2f(p[j][0], p[j][1]); glEnd(); //从原点向各顶点连线 for (j = 0; j < k; j++) { if (j % 2) glColor3f(1.0f, 0.0f, 0.0f); else glColor3f(0.0f, 0.0f, 0.0f); glBegin(GL_LINES); glVertex2f(0, 0); glVertex2f(p[j][0], p[j][1]); glEnd(); } glFlush();}int main(int argc, char * argv[]){ glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); glutInitWindowPosition(0, 100); glutInitWindowSize(500, 500); glutCreateWindow("sheng2_1"); glutDisplayFunc(GMD); glutInitWindowPosition(900, 100); glutInitWindowSize(500, 500); glutCreateWindow("sheng2_2"); glutDisplayFunc(GQT); printf("输入顶点数可选择花型图案的顶点数!(5~100)\n\n"); scanf("%d", &vn); glutInitWindowPosition(450, 100); glutInitWindowSize(500, 500); glutCreateWindow("sheng2_1"); glutDisplayFunc(Flower); glutMainLoop(); return 0;}/*Rshape是不能用在这里的，它起到刷新的作用用算法来实现的必须要用，因为每一帧都要刷新用库函数画的就不必了*/ 0 0
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