#include <stdio.h>
FILE*fout=NULL,*fin=NULL;
int main(int argc,char**argv)
{
if(fout==NULL)
{
fout=fopen("output.txt","w+");
fprintf(fout,"HelloWorld");
}
}
結果:
輸出一個output.txt的文字檔
裡面寫著Hello World
//---------------------------------------------
進階
將茶壺輸出
然後用其輸出來輸出滑鼠X.Y軸的紀錄
程式碼:
#include <GL/glut.h>
#include <stdio.h>
FILE*fout=NULL,*fin=NULL;
void display()
{
glClear(GL_COLOR_BUFFER_BIT |GL_DEPTH_BUFFER_BIT);
glutSolidTeapot(0.3);
glutSwapBuffers();
}
void motion(int x,int y)
{
if(fout==NULL)
{
fout=fopen("output.txt","w+");
}
fprintf(fout,"%d %d\n",x,y);
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("3D");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutMainLoop();
}
結果:
//-------------------------------------------------------------
再進階
將一次的X,Y的座標記錄在檔案中
然後在下一次讀其軌跡檔"output.txt"
按下"r"件來讀取與顯示其位置
程式碼:
#include <GL/glut.h>
#include <stdio.h>
FILE*fout=NULL,*fin=NULL;
int traX=150,traY=150;
void display()
{
glClear(GL_COLOR_BUFFER_BIT |GL_DEPTH_BUFFER_BIT);
glPushMatrix();///保存
glTranslatef((traX-150)/150.0,-(traY-150)/150.0,0);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
void motion(int x,int y)
{
if(fout==NULL)///寫入擋
{
fout=fopen("output.txt","w+");
}
fprintf(fout,"%d %d\n",x,y);
}
void keyboard(unsigned char key,int x,int y)
{
if(key=='r')///讀取檔用"r"鍵
{
if(fin==NULL)
{
fin=fopen("output.txt","r");
}
fscanf(fin,"%d %d\n",&traX,&traY);
}
glutPostRedisplay();更新畫面
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("3D");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutKeyboardFunc(keyboard);
glutMainLoop();
}
結果:
按"r"以後
//----------------------------------------------------------------------
將上禮拜的骨架技術
拆解成一個一個關節
用123456來操縱其關節
然後跟剛才一樣將其記錄在output
所以可以運用"r"鍵來回放剛才調整的
程式碼:
#include <GL/glut.h>
#include <stdio.h>
float rot[10]={0};
int rotNow=0, oldX=0, oldY=0;;
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glPushMatrix();
glutWireCube(0.3);///body
glPushMatrix();
glTranslatef(0,0.2,0);
glutWireCube(0.1);///head
glPopMatrix();
glPushMatrix();
glTranslatef(0.15,0.1,0);
glRotatef(rot[0],0,0,1);
glTranslatef(0.05,0,0);
glutWireCube(0.1);///upper arm
glTranslatef(0.05,0,0);
glRotatef(rot[1],0,0,1);
glTranslatef(0.05,0,0);
glutWireCube(0.1);///lower arm
glTranslatef(0.05,0,0);
glRotatef(rot[2],0,0,1);
glTranslatef(0.05,0,0);
glutWireCube(0.1);///right arm
glPopMatrix();
glPushMatrix();
///glTranslatef(-0.2,0.1,0);
glTranslatef(-0.15,0.1,0);
glRotatef(-rot[4],0,0,1);
glTranslatef(-0.05,0,0);
glutWireCube(0.1);///upper arm
glTranslatef(-0.05,0,0);
glRotatef(-rot[5],0,0,1);
glTranslatef(-0.05,0,0);
glutWireCube(0.1);///lower arm
glTranslatef(-0.05,0,0);
glRotatef(-rot[6],0,0,1);
glTranslatef(-0.05,0,0);
glutWireCube(0.1);///right hand
glPopMatrix();
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
FILE *fout=0, *fin=0;
void keyboard(unsigned char key, int x, int y)
{
if(key=='0') rotNow=0;
if(key=='1') rotNow=1;
if(key=='2') rotNow=2;
if(key=='3') rotNow=3;
if(key=='4') rotNow=4;
if(key=='5') rotNow=5;
if(key=='6') rotNow=6;
if(key=='r'){///按小寫的r 會去讀1行/一組x,y
if(fin==NULL) fin=fopen("motion.txt", "r");
for(int i=0;i<7;i++){
fscanf(fin, "%f", &rot[i]);
}
}
glutPostRedisplay();///電腦貼個Post-It便利貼,告訴GLUT有空要重畫畫面哦
}
void motion(int x, int y)
{
rot[rotNow] += x-oldX;
oldX = x;
glutPostRedisplay();
if(fout==NULL) fout=fopen("motion.txt", "w+");
for(int i=0;i<7;i++){
fprintf(fout, "%3.1f ", rot[i]);
printf("%3.1f ", rot[i]);
}
fprintf(fout, "\n");
printf("\n");
}
void mouse(int button, int state, int x, int y)
{///先開冰箱門(滑鼠按下去),把大象塞進去(滑鼠drag),最後再關上冰箱門(起來)
if(state==GLUT_DOWN){
oldX=x; oldY=y;
}
}
int main(int argc,char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("Robot");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMainLoop();
}
結果:
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