week12電腦圖學

 1.codeblocks開一個檔案

用不同方式執行hello world (printf,fprintf)

#include <stdio.h>

int main()

{

    FILE * fout = fopen("file.txt", "w");

    printf("Hello World\n");

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

}

從file.txt開啟

week12-2 scanf_fscanf

#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);

}

3用滑鼠移動茶壺

#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_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week12");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMainLoop();

}

4

#include <stdio.h>

#include <GL/glut.h>

FILE*fout=NULL;

FILE*fin=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){

        fclose(fout);

        fin=fopen("file4.txt","r");

    }

    fscanf(fin,"%f %f",&teapotX,&teapotY);

    display();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week12");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}

屬標控制茶壺得位置用鍵盤開檔，讀檔

將project->properties->build tragets->execution working dir改成 .

執行後

從freeglut裡面複製freeglut.dll到project的資料夾中

project->properties->build tragets->release->execution working dir改成 .