#week16
##step01-1
alpga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
使用Excel or Google Spreadsheet 來做
#step01-2
用程式試試看 week15_angles_TRT_again拿來改
1.File-New-Project,GLUT,week16_interpolation 內插
2.複製程式,執行,按s會存一行,mouse motion改動作4次,按s存檔
3.原本失敗的結果,按r會讀到動作但不連續,關掉
接下來要改造程式
1.void myInterplate(float alpha)
```
///a
#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]);///檔案印出來
}///這裡老師沒有fclose
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];///原來的新的,變舊
fscanf(fin,"%f", &NewAngle[i]);
///fscanf(fin, "%f",&angle[i]);
}
glutPostRedisplay();
}
void myInterpolate(float alpha){
for(int i=0;i<20;i++){
angle[i] = alpha * NewAngle[i]+(1-alpha) * OldAngle[i];
}
}
int t=0;
float alpha=0;
void keyboard(unsigned char key,int x,int y){
if(key=='p'){///Play
if(t%30==0)myRead();
myInterpolate((t%30)/30.0);///介於0.0~1.0
glutPostRedisplay();
t++;
}
if(key=='s') myWrite();///調好動作才存檔
if(key=='r') myRead();
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Re display
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,1);///白色的
glRectf(0.3,0.5,-0.3,-0.5);///四邊形
glPushMatrix();///右半部
glTranslatef(0.3,0.4,0);///(3)把手臂掛回身體
glRotatef(angle[0],0,0,1);///(2)旋轉 對Z軸轉
glTranslatef(-0.3,-0.4,0);///(1)把手臂的旋轉中心,放中心
glColor3f(1,0,0);//紅色的
glRectf(0.3,0.5,0.7,0.3);
glPushMatrix();
glTranslatef(0.7,0.4,0);///(3)把手肘掛回剛剛的位置
glRotatef(angle[1],0,0,1);///(2)旋轉
glTranslatef(-0.7,-0.4,0);///(1)把手肘旋轉中心,放中心
glColor3f(0,1,0);///綠色的
glRectf(0.7,0.5,1.0,0.3);///上手臂
glPopMatrix();
glPushMatrix();///左半部
glTranslatef(-0.3,0.4,0);///(3)把手臂掛回身體
glRotatef(angle[2],0,0,1);///(2)旋轉 對Z軸轉
glTranslatef(0.3,-0.4,0);///(1)把手臂的旋轉中心,放中心
glColor3f(1,0,0);///紅色的
glRectf(-0.3,0.5,-0.7,0.3);
glPushMatrix();
glTranslatef(-0.7,0.4,0);///(3)把手肘掛回剛剛的位置
glRotatef(angle[3],0,0,1);///(2)旋轉
glTranslatef(0.7,-0.4,0);///(1)把手肘旋轉中心,放中心
glColor3f(0,1,0);///綠色的
glRectf(-0.7,0.5,-1.0,0.3);///上手臂
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
int main(int argc, char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
//glutInitWindowSize(600,600);
glutCreateWindow("week13 rect TRT");
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}```
##step02-1
接下來讓動畫可以不用按P就自動播放,並讓它變得更流暢只需要加入幾行程式碼就好!
利用課本上的projection來幫助我們理解照相機的運作方式
##step03-1
1.File-Bew-Projec,GLUT,week16_camera_projection_gluLookAt
2.輩分177行範例,要改造裡面的程式
3.aspect ratio 長寬比 ex.1920x1080, 1280x720, 640*480, 16:9, 4:3
```
#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);///3D Model+view
glLoadIdentity();
gluLookAt(0,0,3, ///eye
0,0,0, ///center看哪裡
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);///範例是用resize
glutMainLoop();
}
```
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