開一個empty file(不是專案)
#include<stdio.h>
int main()
{
///檔案指標fout 開啟檔案(檔名,write模式)
FILE * fout = fopen("write.txt","w+");
printf("Hello world\n");
fprintf(fout,"Hello world\n");
fclose(fout);
}
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再另外開一個empty file
#include<stdio.h>
int main()
{
///檔案指標fout 開啟檔案(檔名,write模式)
FILE * fout = fopen("file.txt","w+");
fprintf(fout,"3.1415926\n");
fclose(fout);///關檔
float angle =0;
FILE * fin=fopen("file.txt","r");
fscanf(fin,"%f",&angle);///沒加&會當
printf("讀到了角度:%f",angle);
fclose(fin);
}
拿上禮拜的程式碼再加點東西
#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
///1f要空格
}
printf("\n");///每呼叫一次小黑會跳行
fprintf(fout,"\n");///每呼叫一次檔案會跳行
}///這邊沒有fclose
void myRead(){
if(fout != NULL){fclose(fout);fout=NULL;}
if(fin==NULL) fin =fopen("file.txt","r");
for(int i=0;i<20;i++){
fscanf(fin,"%f",&angle[i]);
}
glutPostRedisplay();///重新清畫面
}
void keyboard(unsigned char key,int x,int y)
{
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
glRectf(0.3,0.5, -0.3,-0.5);///四邊形當身體
glPushMatrix();///右邊
glTranslatef(0.3,0.4,0);///(3)整體移位
glRotatef(angle[0],0,0,1);///(2)
glTranslatef(-0.3,-0.4,0);///(1)把軸心放在正中心
glColor3f(1,0,0);///紅
glRectf(0.3,0.5,0.7,0.3);///上手臂
glPushMatrix();
glTranslatef(0.7,0.4,0);///(3)整體移位
glRotatef(angle[1],0,0,1);///(2)
glTranslatef(-0.7,-0.4,0);///(1)把軸心放在正中心
glColor3f(0,1,0);///綠
glRectf(0.7,0.5,1.0,0.3);///下手臂
glPopMatrix();
glPopMatrix();
glPushMatrix();///左邊
glTranslatef(-0.3,0.4,0);///(3)整體移位
glRotatef(angle[2],0,0,1);///(2)
glTranslatef(0.3,-0.4,0);///(1)把軸心放在正中心
glColor3f(1,0,0);///紅
glRectf(-0.3,0.5,-0.7,0.3);///上手臂
glPushMatrix();
glTranslatef(-0.7,0.4,0);///(3)整體移位
glRotatef(angle[3],0,0,1);///(2)
glTranslatef(0.7,-0.4,0);///(1)把軸心放在正中心
glColor3f(0,1,0);///綠
glRectf(-0.7,0.5,-1.0,0.3);///下手臂
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
int main(int argc, char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize(600,600);
glutCreateWindow("week14_TRT");
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}
產生的檔案file.txt跑到 C:\Users\user\Desktop\freeglut\gin ；想要放在程式專案的那個目錄裡
需要 freeglut.dll ( working_dir被設到 freeglut\bin 裡面)
在 .cbp CodeBlocks Project 檔裡, 有 working_dir的設定 工作執行的目錄
使用 Notepad++ 把 .cbp 的 working_dir="....." 改 working_dir="." (小數點)
存檔後, CodeBlocks Reload它
放到week14_angles_fprintf_fscanf 程式專案的同目錄, 再執行時, mouse motion & 按r重播就ok
file.txt 放在你的程式專案目錄囉!!!
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