輸入咒語與程式碼
程式碼如下：
#include <stdio.h>
FILE *fout=NULL,*fin=NULL;//檔案的指標
int main(int argc,char **argv)
{
if(fout==NULL) fout=fopen("output.txt","w+");
//如果fout為空指標，觸發條件
//讓fout輸出新的文件，"w+"寫入
fprintf(fout,"Hello World");
}
執行結果：
2.增加程式碼為：
#include <stdio.h>
#include <GL/glut.h>
FILE *fout=NULL,*fin=NULL;//檔案的指標
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");
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
}
3.利用輸出的滑鼠移動數據檔案，將位置輸入到茶壺座標，讓茶壺移動
#include <stdio.h>
#include <GL/glut.h>
FILE *fout=NULL,*fin=NULL;//檔案的指標
int nowX=150,nowY=150;//讀取檔案位置的座標點
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();//stack push
glTranslatef((nowX-150)/150.0 , -(nowY-150)/150.0,0);
//視窗初始設定大小是300x300，所以中心座標(150,150)，因此減掉150，讓範圍在-150到150之間
//因為視窗的實際座標是1到-1之間，因此在除以150.0，讓座標在1.0到-1.0之間的float(浮點)數
glutSolidTeapot(0.3);
glPopMatrix();//stack pop
glutSwapBuffers();
}
void motion(int x,int y)
{
if(fout==NULL) fout=fopen("output.txt","w+");
fprintf(fout,"%d %d\n",x,y);
}
void keyboard(unsigned char key, int X, int y)
{
if(key=='a')//當鍵盤輸入'a'時，觸發下方條件
{
if(fin==NULL) fin=fopen("output.txt","r");
fscanf(fin, "%d %d", &nowX, &nowY);
}
glutPostRedisplay();//告知電腦/GLUT，有空時要進行畫面重製
}
int main(int argc,char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("3D");
glutMotionFunc(motion);
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMainLoop();
}
4.機器人
理解關節動
#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();
}
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