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其實這程式碼滿多都是照著課本打而已，xyz的數學式子也都是課本給的。所以只好盜用一下課本的圖了~~~哈哈。
1.更改原本是填滿的Polygon，變成只要線就好。Polygon輸出時是不包含線的，因此如果要線，那就需要重新再以線的模式下去畫。
此作業因為只需要線，所以就直接輸出線就好。用glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)，GL_FRONT_AND_BACK讓他前後有區分，GL_LINE畫出線。
2.初步使用Rotatef旋轉坐標軸。
glRotatef(-60,1,0,0) 。第一個參數為旋轉角度，接下來的參數分別為x、y、z軸。要旋轉的軸參數就填上1。
3.設定線的寬度 glLineWidth(2);
線的寬度0.5~10。
結果
程式碼
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| /******************** | |
| Computer Graghics | |
| Author：SHEN ZHI-XUN | |
| Time：2016/10/22 | |
| ********************/ | |
| #include <iostream> | |
| #include <GL/glut.h> | |
| #include <math.h> | |
| #define M_PI 3.14159 | |
| using namespace std; | |
| void display() { | |
| glClear(GL_COLOR_BUFFER_BIT); //清除COLOR_BUFFER。 | |
| glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); //設定PolygonMode。 | |
| glLineWidth(2); //設定線的寬度。 | |
| glRotatef(-60,1,0,0); //向Z軸旋轉-60度。 | |
| GLdouble c = M_PI / 180.0; //M_PI=3.14159, 轉degree成radian的係數。 | |
| GLdouble x, y, z, thetar; | |
| for (double phi = -80.0; phi <= 80;phi+=20.0) { | |
| GLdouble phir = c*phi; | |
| GLdouble phir20 = c*(phi+20); | |
| glBegin(GL_QUAD_STRIP); | |
| for (GLdouble theta = -180.0; theta <= 180.0;theta+=20.0) { | |
| thetar = c*theta; | |
| x = sin(thetar)*cos(phir); | |
| y = cos(thetar)*cos(phir); | |
| z = sin(phir); | |
| glVertex3d(x,y,z); | |
| x = sin(thetar)*cos(phir20); | |
| y = cos(thetar)*cos(phir20); | |
| z = sin(phir20); | |
| glVertex3d(x, y, z); | |
| } | |
| glEnd(); | |
| glFlush(); | |
| } | |
| //north pole | |
| glBegin(GL_TRIANGLE_FAN); | |
| glVertex3d(0.0,0.0,1.0); | |
| GLdouble c80 = c*80.0; | |
| z = sin(c80); | |
| for (GLdouble theta = -180.0; theta <= 180;theta+=20) { | |
| thetar = c*theta; | |
| x = sin(thetar)*cos(c80); | |
| y = cos(thetar)*cos(c80); | |
| glVertex3d(x,y,z); | |
| } | |
| glEnd(); | |
| glFlush(); | |
| //south pole | |
| glBegin(GL_TRIANGLE_FAN); | |
| glVertex3d(0.0,0.0,-1.0); | |
| z = -sin(c80); | |
| for (GLdouble theta = -180.0; theta <= 180.0;theta+=20.0) { | |
| thetar = c*theta; | |
| x = sin(thetar)*cos(c80); | |
| y = cos(thetar)*cos(c80); | |
| glVertex3d(x,y,z); | |
| } | |
| glEnd(); | |
| glFlush(); | |
| } | |
| void init() {} | |
| int main(int argc,char** argv) { | |
| glutInit(&argc, argv); | |
| glutInitWindowSize(500, 500); | |
| glutInitWindowPosition(100,100); | |
| glutCreateWindow("Sphere Approximation"); | |
| glutDisplayFunc(display); | |
| init(); | |
| glutMainLoop(); | |
| return 0; | |
| } |
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