1.alpha公式: alpha: 0.0~1.0
angle=angle*新+(1-angle)*舊
alpha: 0 => 舊
alpha: 0.5 => 新/舊
alpha: 1 => 新
1.1 動畫補間? #include <GL/glut.h>
#include <stdio.h>
float angle[20],oldX=0;
float newangle[20],oldangle[20];
int angleid=0;///0右手 1右手關節 2左手 3左手關節
FILE * fout = NULL , *fin =NULL;
void write()
{
if(fout == NULL) fout = fopen("file.txt","w+");
for(int i=0;i<20;i++)
{
printf("%.1f",angle[i]);///印出黑視窗
fprintf(fout,"%.1f",angle[i]);///印出檔案
}///印出20個數字
printf("\n");///每呼叫一次,黑視窗跳行
fprintf(fout,"\n");///每呼叫一次,檔案跳行
}
void read()
{
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];///原來新的變舊的
fscanf(fin,"%f", &newangle[i]);讀新角度
}
glutPostRedisplay();///重畫畫面
}
void interpolate(float alpha)
{
for(int i=0;i<20;i++)
{
angle[i]=alpha*newangle[i]+(1-alpha)*oldangle[i];
}
}
int t=0;
void key(unsigned char key,int x,int y)
{
if(key=='p') ///p要一直按著
{
if(t%30==0) read();
interpolate( (t%30)/30.0 );///介於0.0到1.0
glutPostRedisplay();
t++;
}
if(key=='s') write();///調好動作後存檔
if(key=='r') read();
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);
///write(); 不再複讀
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);///手臂掛回身體
glRotatef(angle[0],0,0,1);///對z軸旋轉
glTranslatef(-0.3,-0.4,0);///手臂旋轉軸放中心
glColor3f(1,0,0);
glRectf(0.3,0.5,0.7,0.3);
glPushMatrix();
glTranslatef(0.7,0.4,0);///手臂掛回身體
glRotatef(angle[1],0,0,1);///對z軸旋轉
glTranslatef(-0.7,-0.4,0);///手臂旋轉軸放中心
glColor3f(0,1,0);
glRectf(0.7,0.5,1.0,0.3);///下手肘
glPopMatrix();
glPopMatrix();
glPushMatrix();
glTranslatef(-0.3,0.4,0);///手臂掛回身體
glRotatef(angle[2],0,0,1);///對z軸旋轉
glTranslatef(0.3,-0.4,0);///手臂旋轉軸放中心
glColor3f(1,0,0);
glRectf(-0.3,0.5,-0.7,0.3);
glPushMatrix();
glTranslatef(-0.7,0.4,0);///手臂掛回身體
glRotatef(angle[3],0,0,1);///對z軸旋轉
glTranslatef(0.7,-0.4,0);///手臂旋轉軸放中心
glColor3f(0,1,0);
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);
glutCreateWindow("week15 trt 2");
glutMouseFunc(mouse);
glutKeyboardFunc(key);
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
}
#先存數個座標
1-2 按一次P自動補間
#include <GL/glut.h>
#include <stdio.h>
float angle[20],oldX=0;
float newangle[20],oldangle[20];
int angleid=0;///0右手 1右手關節 2左手 3左手關節
FILE * fout = NULL , *fin =NULL;
void write()
{
if(fout == NULL) fout = fopen("file.txt","w+");
for(int i=0;i<20;i++)
{
printf("%.1f",angle[i]);///印出黑視窗
fprintf(fout,"%.1f",angle[i]);///印出檔案
}///印出20個數字
printf("\n");///每呼叫一次,黑視窗跳行
fprintf(fout,"\n");///每呼叫一次,檔案跳行
}
void read()
{
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 interpolate(float alpha)
{
for(int i=0;i<20;i++)
{
angle[i]=alpha*newangle[i]+(1-alpha)*oldangle[i];
}
}
///int t=0;
void timer(int t)
{
if(t%50==0) read();
interpolate( (t%50)/50.0 );///介於0.0到1.0
glutPostRedisplay();
glutTimerFunc(5,timer,t+1);
}
void key(unsigned char key,int x,int y)
{
if(key=='p')
{
read();
glutTimerFunc(0,timer,0);
///if(t%30==0) read();
///interpolate( (t%30)/30.0 );///介於0.0到1.0
///glutPostRedisplay();
///t++;
}
if(key=='s') write();///調好動作後存檔
if(key=='r') read();
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);
///write(); 不再複讀
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);///手臂掛回身體
glRotatef(angle[0],0,0,1);///對z軸旋轉
glTranslatef(-0.3,-0.4,0);///手臂旋轉軸放中心
glColor3f(1,0,0);
glRectf(0.3,0.5,0.7,0.3);
glPushMatrix();
glTranslatef(0.7,0.4,0);///手臂掛回身體
glRotatef(angle[1],0,0,1);///對z軸旋轉
glTranslatef(-0.7,-0.4,0);///手臂旋轉軸放中心
glColor3f(0,1,0);
glRectf(0.7,0.5,1.0,0.3);///下手肘
glPopMatrix();
glPopMatrix();
glPushMatrix();
glTranslatef(-0.3,0.4,0);///手臂掛回身體
glRotatef(angle[2],0,0,1);///對z軸旋轉
glTranslatef(0.3,-0.4,0);///手臂旋轉軸放中心
glColor3f(1,0,0);
glRectf(-0.3,0.5,-0.7,0.3);
glPushMatrix();
glTranslatef(-0.7,0.4,0);///手臂掛回身體
glRotatef(angle[3],0,0,1);///對z軸旋轉
glTranslatef(0.7,-0.4,0);///手臂旋轉軸放中心
glColor3f(0,1,0);
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);
glutCreateWindow("week15 trt 2");
glutMouseFunc(mouse);
glutKeyboardFunc(key);
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
}
2-1 運鏡
window => Projection.exe
<= eye => 鏡頭位置
<= center => 鏡頭看的位置
<= up => 畫面旋轉角度
2-2 resize
#include <GL/glut.h>
void reshape(int w,int h) ///不能整數除法
{
float ar=(float)w/(float)h;
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);///3D=>2D
glLoadIdentity();
gluPerspective(60,ar,0.1,100);
glMatrixMode(GL_MODELVIEW);///3D Model+View
glLoadIdentity();
gluLookAt(1,0,3,///eye
0,1,0,///center看哪裡
0,0,1);///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);///範例用resize
glutMainLoop();
}
2-3 用滑鼠改變鏡頭位置
#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=>2D
glLoadIdentity();
gluPerspective(60,ar,1,10);
glMatrixMode(GL_MODELVIEW);///3D Model+View
glLoadIdentity();
gluLookAt(1,0,3,///eye
0,1,0,///center看哪裡
0,0,2);///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);///3D Model+View
glLoadIdentity();
gluLookAt( (x-150)/150.0 , (y-150)/150.0 , 3 ,///eye
0,1,0,///center看哪裡
0,0,2);///up向量
glutPostRedisplay();
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("Week16 camera");
glutMotionFunc(motion);
glutDisplayFunc(display);
glutReshapeFunc(reshape);///範例用resize
glutMainLoop();
}
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