電腦圖學 檔案讀寫

week12-1_printf_fprintf.cpp

#include <stdio.h>

int main()

{

    FILE*fout=fopen("file.txt","w");

    printf("Hello World\n");

    fprintf(fout,"Hello World在檔案裡\n");

}

會跑出Hello World

桌面上的.txt檔裡就是Hello Word

week12-2_scanf_fscanf.cpp

#include <stdio.h>

int main()

{

    FILE*fin=fopen("file.txt","r");

    char line[100];

    fscanf(fin,"%s",line);

    printf("從file.txt讀到了: %s\n",line);

    fscanf(fin,"%s",line);

    printf("從file.txt讀到了: %s\n",line);

}

week12-3_many_numbers_scanf_printf_fscanf_fprintf.cpp

#include <stdio.h>

int main()

{

    int a[10]={10,20,30,40,50,60,70,80,90,100};

    int b[10]={};

    FILE*fout=fopen("file3.txt","w");

    for(int i=0; i<10; i++){

        printf("%d ",a[i]);

        fprintf(fout,"%d ",a[i]);

    }

    printf("\n");

    fprintf(fout,"\n");

    fclose(fout);

    FILE*fin=fopen("file3.txt","r");

    for(int i=0; i<10; i++){

        fscanf(fin,"%d",&b[i]);

        printf("b%d:%d ",i,b[i]);

    }

    fclose(fin);

}

GLUT專案

week12-4_keyboard_mouse

把project-properties --> build tergets --> debug跟release都要改

然後把freeglut.dll丟進這個資料夾

step-1

#include <stdio.h>
#include <GL/glut.h>
float teapotX=0, teapotY=0;
void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glTranslatef(teapotX, teapotY, 0);
        glutSolidTeapot(0.3);
    glPopMatrix();
    glutSwapBuffers();
}
void mouse(int button, int state, int x, int y)
{
    if(state==GLUT_DOWN){
        teapotX=(x-150)/150.0;
        teapotY=(150-y)/150.0;
    }
    display();
}
int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("week12");

    glutDisplayFunc(display);
    glutMouseFunc(mouse);
    glutMainLoop();
}

茶壺會跟著滑鼠按的地方移動

step-2

#include <stdio.h>

#include <GL/glut.h>

FILE*fout=NULL;///一開始檔案沒開,所以是NULL

FILE*fin=NULL;///要讀檔用的指標,一開始也是NULL

float teapotX=0, teapotY=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(teapotX, teapotY, 0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void mouse(int button, int state, int x, int y)

{

    if(state==GLUT_DOWN){

        teapotX=(x-150)/150.0;

        teapotY=(150-y)/150.0;

        if(fout==NULL) fout=fopen("file4.txt","w");

            fprintf(fout,"%f %f\n",teapotX,teapotY);

    }

    display();

}

void keyboard(unsigned char key,int x,int y)

{

    if(fin==NULL){///如果檔案還沒fopen(),就打開它

        fclose(fout);///前面mouse會開fout指標,所以要關掉

        fin=fopen("file4.txt","r");///沒開檔案就開它

    }

    fscanf(fin,"%f %f",&teapotX,&teapotY);///真的讀檔

    display();///重畫畫面

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week12");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutKeyboardFunc(keyboard);///keyboard開檔讀檔

    glutMainLoop();

}

茶壺會跟著滑鼠按的地方移動

再按空白鍵 茶壺就會跟著剛剛的軌跡出現

好躁喔!