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這次功課主要是用glutTimerFunc(int delay,void (*timer_func),int value)達到delay並佐課本給的方程式來達到點旋轉的效果。
//Timer 為自己取的名子
void Timer(int value){
glutTimerFunc(50,Timer,0);
//50：延遲50/1000(s)，Timer：呼叫void Timer(int value)，0：傳給Timer的參數。
}
結果：
程式碼：
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| /******************** | |
| Computer Graghics | |
| Author：SHEN ZHI-XUN | |
| Time：2016/11/26 | |
| ********************/ | |
| #include <iostream> | |
| #include <cmath> | |
| #include <GL/glut.h> | |
| using namespace std; | |
| void display() { | |
| static GLdouble dRadius = 0.1; | |
| static GLdouble dAngle = 0.0; | |
| glClearColor(0.0f, 0.0f, 1.0f, 0.0f); | |
| if (dAngle == 0.0) glClear(GL_COLOR_BUFFER_BIT); //當角度等於0時，清除畫面 | |
| glBegin(GL_POINTS); | |
| glVertex2d(dRadius*cos(dAngle), dRadius*sin(dAngle)); //在此座標打上點。 | |
| glEnd(); | |
| dRadius *= 1.01; | |
| dAngle += 0.1; | |
| if (dAngle > 30.0) { | |
| dRadius = 0.1; | |
| dAngle = 0.0; | |
| } | |
| glFlush(); | |
| } | |
| void delayTime(int time) { | |
| glutPostRedisplay(); | |
| glutTimerFunc(time, delayTime, 25); | |
| } | |
| void reshape(int w,int h) { | |
| GLfloat aspectRatio; | |
| if (h <= 0) h = 1; | |
| glViewport(0, 0, w, h); | |
| glMatrixMode(GL_PROJECTION); | |
| glLoadIdentity(); | |
| glLoadIdentity(); | |
| aspectRatio = (GLfloat)w / (GLfloat)h; | |
| if (w <= h) | |
| glOrtho(-2, 2, -2 / aspectRatio, 2 / aspectRatio, 2, -2); | |
| else | |
| glOrtho(-2*aspectRatio, 2*aspectRatio, -2, 2, 2, -2); | |
| glMatrixMode(GL_MODELVIEW); | |
| glLoadIdentity(); | |
| } | |
| int main(int argc,char** argv) { | |
| glutInitWindowSize(400, 400); | |
| glutCreateWindow("Spiral_Points"); | |
| glutReshapeFunc(reshape); | |
| glutTimerFunc(25, delayTime, 25); //delay | |
| glutDisplayFunc(display); | |
| glutMainLoop(); | |
| return 0; | |
| } |
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