今天老師教我們alpha內插公式
angle=alpha*新+(1-alpha)*舊
這樣才能讓動畫跑得更加順暢
並且也用excel示範了一次
然後我們把上次的程式碼複製過來並進行修改
可以看到之前會卡卡的動作,現在變得非常流暢
#include <GL/glut.h>
#include <stdio.h>
float angle[20], oldX=0;
int angleID=0;
FILE * fout = NULL, * fin = NULL;
void myWrite(){///每呼叫一次myWrite()
if( fout == NULL ) fout = fopen("file.txt", "w+");
for(int i=0; i<20; i++){
printf("%.1f ", angle[i] );///小黑印出來
fprintf(fout, "%.1f ", angle[i] );///檔案印出來
}///印出20個數字
printf("\n");///每呼叫一次, 小黑跳行
fprintf(fout, "\n");///每呼叫一次, 檔案也跳行
}///這裡老師沒有fclose
float Newangle[20],Oldangle[20];
void myRead(){
if( fout != NULL ) { fclose(fout); fout=NULL; }
if( fin == NULL ) fin = fopen("file.txt", "r");
for(int i=0; i<20; i++){
Oldangle[i]=Newangle[i];
fscanf(fin, "%f", &Newangle[i] );
}
glutPostRedisplay();///重畫畫面
}
void myinterporlate(float alpha){
for(int i=0;i<20;i++){
angle[i]=alpha * Newangle[i] + (1-alpha) * Oldangle[i];
}
}
int t=0;
void keyboard(unsigned char key, int x, int y){
if( key=='p' ){
if(t%30==0) myRead();
myinterporlate((t%30)/30.0);
glutPostRedisplay();
t++;
}
if( key=='s' ) myWrite();///調好動作,才Save存檔
if( key=='r' ) myRead();
if( key=='0' ) angleID=0;
if( key=='1' ) angleID=1;
if( key=='2' ) angleID=2;
if( key=='3' ) angleID=3;
}
void mouse(int button, int state, int x, int y){
oldX = x;
}
void motion(int x, int y){
angle[angleID] += (x-oldX);
///myWrite();
oldX = x;
glutPostRedisplay();
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,1);
glRectf( 0.3, 0.5, -0.3, -0.5);
glPushMatrix();
glTranslatef( 0.3, 0.4, 0);
glRotatef(angle[0], 0,0,1);
glTranslatef(-0.3, -0.4, 0);
glColor3f(1,0,0);
glRectf( 0.3, 0.5, 0.7, 0.3);
glPushMatrix();
glTranslatef( 0.7, 0.4, 0);
glRotatef(angle[1], 0,0,1);
glTranslatef(-0.7, -0.4, 0);
glColor3f(0,1,0);///��⪺
glRectf( 0.7, 0.5, 1.0, 0.3);
glPopMatrix();
glPopMatrix();
glPushMatrix(); ///���b��
glTranslatef(-0.3, 0.4, 0);
glRotatef(angle[2], 0,0,1);
glTranslatef(+0.3, -0.4, 0);
glColor3f(1,0,0);///���⪺
glRectf(-0.3, 0.5, -0.7, 0.3);
glPushMatrix();
glTranslatef(-0.7, 0.4, 0);
glRotatef(angle[3], 0,0,1);
glTranslatef(+0.7, -0.4, 0);
glColor3f(0,1,0);
glRectf(-0.7, 0.5,-1.0, 0.3);
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
int main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
///glutInitWindowSize(600,600);
glutCreateWindow("week16 interporlation");
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
}
不過這樣還是需要按住P才能讓他播放,我們要改成按一下就可以自動播放
所以我們要加上timer
#include <GL/glut.h>
#include <stdio.h>
float angle[20], oldX=0;
int angleID=0;
FILE * fout = NULL, * fin = NULL;
void myWrite(){///每呼叫一次myWrite()
if( fout == NULL ) fout = fopen("file.txt", "w+");
for(int i=0; i<20; i++){
printf("%.1f ", angle[i] );///小黑印出來
fprintf(fout, "%.1f ", angle[i] );///檔案印出來
}///印出20個數字
printf("\n");///每呼叫一次, 小黑跳行
fprintf(fout, "\n");///每呼叫一次, 檔案也跳行
}///這裡老師沒有fclose
float Newangle[20],Oldangle[20];
void myRead(){
if( fout != NULL ) { fclose(fout); fout=NULL; }
if( fin == NULL ) fin = fopen("file.txt", "r");
for(int i=0; i<20; i++){
Oldangle[i]=Newangle[i];
fscanf(fin, "%f", &Newangle[i] );
}
glutPostRedisplay();///重畫畫面
}
void myinterporlate(float alpha){
for(int i=0;i<20;i++){
angle[i]=alpha * Newangle[i] + (1-alpha) * Oldangle[i];
}
}
void timer(int t){
if(t%50==0) myRead();
myinterporlate((t%50)/50.0);
glutPostRedisplay();
glutTimerFunc(20,timer,t+1);
}
void keyboard(unsigned char key, int x, int y){
if( key=='p' ){
myRead();
glutTimerFunc(0,timer,0);
///myinterporlate((t%30)/30.0);
///glutPostRedisplay();
///t++;
}
if( key=='s' ) myWrite();///調好動作,才Save存檔
if( key=='r' ) myRead();
if( key=='0' ) angleID=0;
if( key=='1' ) angleID=1;
if( key=='2' ) angleID=2;
if( key=='3' ) angleID=3;
}
void mouse(int button, int state, int x, int y){
oldX = x;
}
void motion(int x, int y){
angle[angleID] += (x-oldX);
///myWrite();
oldX = x;
glutPostRedisplay();
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,1);
glRectf( 0.3, 0.5, -0.3, -0.5);
glPushMatrix();
glTranslatef( 0.3, 0.4, 0);
glRotatef(angle[0], 0,0,1);
glTranslatef(-0.3, -0.4, 0);
glColor3f(1,0,0);
glRectf( 0.3, 0.5, 0.7, 0.3);
glPushMatrix();
glTranslatef( 0.7, 0.4, 0);
glRotatef(angle[1], 0,0,1);
glTranslatef(-0.7, -0.4, 0);
glColor3f(0,1,0);
glRectf( 0.7, 0.5, 1.0, 0.3);
glPopMatrix();
glPopMatrix();
glPushMatrix();
glTranslatef(-0.3, 0.4, 0);
glRotatef(angle[2], 0,0,1);
glTranslatef(+0.3, -0.4, 0);
glColor3f(1,0,0);
glRectf(-0.3, 0.5, -0.7, 0.3);
glPushMatrix();
glTranslatef(-0.7, 0.4, 0);
glRotatef(angle[3], 0,0,1);
glTranslatef(+0.7, -0.4, 0);
glColor3f(0,1,0);
glRectf(-0.7, 0.5,-1.0, 0.3);
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
int main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
///glutInitWindowSize(600,600);
glutCreateWindow("week16 interporlation");
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
}
由於我們接下來要學攝影機
所以老師要我們先打開projection.exe檔案來看看
我們把一開始的範例程式碼複製起來
然後全部刪掉開始修改
把基礎10行程式打好
再加上reshape函式
#include <GL/glut.h>
void reshape(int w,int h)
{
float ar = (float) w/(float) h;
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60,ar,0.1,100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0,0,3,
0,0,0,
0,1,0);
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glutSolidTeapot(1);
glutSwapBuffers();
}
int main(int argc,char ** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16");
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoop();
}
可以使用滑鼠拖動來改變視角
#include <GL/glut.h>
void reshape(int w,int h)
{
float ar = (float) w/(float) h;
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60,ar,0.1,100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0, 0, 3,
0, 0, 0,
0, 1, 0);
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glutSolidTeapot(1);
glutSwapBuffers();
}
void motion(int x,int y){
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt((x-150)/150.0,(y-150)/150.0,3,
0 , 0, 0,
0, 1, 0);
glutPostRedisplay();
}
int main(int argc,char ** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16");
glutMotionFunc(motion);
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoop();
}





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