古利夏醫生的艾爾迪亞日記 week14

 早上好

今天上寫檔讀檔

step1 

開一個新檔案 叫week14-1 寫檔

程式碼:

#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+");

    printf(      "Hello World\n");

    fprintf(fout,"Hello World\n");

    fclose(fout);///關閉檔案

}

step2

再開一個新檔案 week14-2    讀檔

程式碼:

#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);///關閉檔案

    float angle=0;

    FILE * fin = fopen("file.txt","r");

    fscanf(fin,"%f",&angle); ///沒加&會當掉

    printf("讀到了角度:%f",angle);

    fclose(fin);

}

step 3 把上週的程式碼搞過來

#include <GL/glut.h>

#include <stdio.h>

float angle[20],oldX=0;

int angleID=0;///0號關節,1號關節...

FILE * fout = 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 

    }

}

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

    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重劃畫面

}

 void display()

 {

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,1);///白色

    glRectf(0.3,0.5,-0.3,-0.5);///身體

    glPushMatrix();

        glTranslatef(0.3,0.4,0);///把手臂掛在身上

        glRotatef(angle[0],0,0,1);///對z軸旋轉

        glTranslatef(-0.3,-0.4,0);///挑整手臂的旋轉中心

        glColor3f(1,0,0);

        glRectf(0.3,0.5,0.7,0.3);

        glPushMatrix();

            glTranslatef(0.7,0.4,0);///把手肘掛回去

            glRotatef(angle[1],0,0,1);///旋轉

            glTranslatef(-0.7,-0.4,0);

            glColor3f(0,1,0);///綠色的

            glRectf(0.7,0.5,1.0,0.3);///下手肘

        glPopMatrix();

    glPopMatrix();

    glPushMatrix();

        glTranslatef(-0.3,0.4,0);///把手臂掛在身上

        glRotatef(angle[2],0,0,1);///對z軸旋轉

        glTranslatef(0.3,-0.4,0);///挑整手臂的旋轉中心

        glColor3f(1,0,0);

        glRectf(-0.3,0.5,-0.7,0.3);

        glPushMatrix();

            glTranslatef(-0.7,0.4,0);///把手肘掛回去

            glRotatef(angle[3],0,0,1);///旋轉

            glTranslatef(0.7,-0.4,0);

            glColor3f(0,1,0);///綠色的

            glRectf(-0.7,0.5,-1.0,0.3);///下手肘

        glPopMatrix();

    glPopMatrix();

    glutSwapBuffers();

 }

 int main(int argc, char *argv[])//main()主函式 進階版

 {

    glutInit(&argc,argv);//把參數送給glutInit初始化

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);//雙緩衝區+3D深度功能

    ///glutInitWindowSize(600,600);

    glutCreateWindow("week13_rect_TRT");//開GLUT視窗

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutDisplayFunc(display);//顯示用的函式

    glutMainLoop();

 }