step01
1.alpha內插公式:alpha:0.0~1.0
angle=alpha*新+(1-alpha)*舊
ex:
alpha:0 舊
alpha:0.5 半新半舊
alpha:1 新
2.用week15_angles_TRT_again改
file-new-project week16_interpolation
```c++
#include <GL/glut.h>
#include <stdio.h>
float angle[20],oldX=0;
int angleID=0;
FILE*fout=NULL,*fin=NULL;
void 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]);
}
printf("\n");
fprintf(fout,"\n");
}
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 myInterpolate(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')///play
{
if(t%30==0) myRead();
myInterpolate((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();///請glut重畫畫面
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,1);///白色
glRectf(0.3,0.5,-0.3,-0.5);///四邊形
glPushMatrix();///右半部
glTranslatef(0.3,0.4,0);///把手臂掛回身體
glRotatef(angle[0],0,0,1);///旋轉,對z軸轉
glTranslatef(-0.3,-0.4,0);///把手臂旋轉中心放在正中心
glColor3f(1,0,0);///紅色
glRectf(0.3,0.5,0.7,0.3);///上手臂
glPushMatrix();
glTranslatef(0.7,0.4,0);///把手臂掛回身體
glRotatef(angle[1],0,0,1);///旋轉,對z軸轉
glTranslatef(-0.7,-0.4,0);///把手臂旋轉中心放在正中心
glColor3f(0,1,0);///綠色
glRectf(0.7,0.5,1.0,0.3);///下手肘
glPopMatrix();
glPopMatrix();
glPushMatrix();///左半部
glTranslatef(-0.3,0.4,0);///把手臂掛回身體
glRotatef(angle[2],0,0,1);///旋轉,對z軸轉
glTranslatef(0.3,-0.4,0);///把手臂旋轉中心放在正中心
glColor3f(1,0,0);///紅色
glRectf(-0.3,0.5,-0.7,0.3);///上手臂
glPushMatrix();
glTranslatef(-0.7,0.4,0);///把手臂掛回身體
glRotatef(angle[3],0,0,1);///旋轉,對z軸轉
glTranslatef(0.7,-0.4,0);///把手臂旋轉中心放在正中心
glColor3f(0,1,0);///綠色
glRectf(-0.7,0.5,-1.0,0.3);///下手肘
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutInitWindowSize(600,600);
glutCreateWindow("week15 angle TRT again");
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
}
```
step02
按一下p鍵重複動作
```c++
#include <GL/glut.h>
#include <stdio.h>
float angle[20],oldX=0;
int angleID=0;
FILE*fout=NULL,*fin=NULL;
void 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]);
}
printf("\n");
fprintf(fout,"\n");
}
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 myInterpolate(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();
myInterpolate((t%50)/50.0);
glutPostRedisplay();
glutTimerFunc(20,timer,t+1);
}
void keyboard(unsigned char key,int x,int y)
{
if(key=='p')///play
{
myRead();
glutTimerFunc(0,timer,0);
}
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();///請glut重畫畫面
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,1);///白色
glRectf(0.3,0.5,-0.3,-0.5);///四邊形
glPushMatrix();///右半部
glTranslatef(0.3,0.4,0);///把手臂掛回身體
glRotatef(angle[0],0,0,1);///旋轉,對z軸轉
glTranslatef(-0.3,-0.4,0);///把手臂旋轉中心放在正中心
glColor3f(1,0,0);///紅色
glRectf(0.3,0.5,0.7,0.3);///上手臂
glPushMatrix();
glTranslatef(0.7,0.4,0);///把手臂掛回身體
glRotatef(angle[1],0,0,1);///旋轉,對z軸轉
glTranslatef(-0.7,-0.4,0);///把手臂旋轉中心放在正中心
glColor3f(0,1,0);///綠色
glRectf(0.7,0.5,1.0,0.3);///下手肘
glPopMatrix();
glPopMatrix();
glPushMatrix();///左半部
glTranslatef(-0.3,0.4,0);///把手臂掛回身體
glRotatef(angle[2],0,0,1);///旋轉,對z軸轉
glTranslatef(0.3,-0.4,0);///把手臂旋轉中心放在正中心
glColor3f(1,0,0);///紅色
glRectf(-0.3,0.5,-0.7,0.3);///上手臂
glPushMatrix();
glTranslatef(-0.7,0.4,0);///把手臂掛回身體
glRotatef(angle[3],0,0,1);///旋轉,對z軸轉
glTranslatef(0.7,-0.4,0);///把手臂旋轉中心放在正中心
glColor3f(0,1,0);///綠色
glRectf(-0.7,0.5,-1.0,0.3);///下手肘
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutInitWindowSize(600,600);
glutCreateWindow("week15 angle TRT again");
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
}
```
glutLookat(x,y,z, eye 眼睛的位置
x,y,z center 要拍的中心的座標
x,y,z ) up
step03
week16_camera_projecttion_gluLookAt
aspect ratio 長寬比 ex:1920x1080 ,1280x720 ,640x480 ,16:9 ,4:3
```c++
#include <GL/glut.h>
void reshape(int w,int h)
{
float ar=(float)w/(float)h;
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);///3D變2D
glLoadIdentity();
gluPerspective(60,ar,0.1,100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0,0,3, ///eye
0,0,0, ///center
0,1,0);///up向量
}
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 camera");
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoop();
}
```
按滑鼠可拖曳茶壺模型角度
```c++
#include <GL/glut.h>
void reshape(int w,int h)
{
float ar=(float)w/(float)h;
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);///3D變2D
glLoadIdentity();
gluPerspective(60,ar,0.1,100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0,0,3, ///eye
0,0,0, ///center
0,1,0);///up向量
}
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();///重畫畫面
}
int main(int argc,char** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week16 camera");
glutMotionFunc(motion);
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoop();
}
```
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