- Draw -
❖ 茶壺跟著滑鼠移動,利用數字鍵切換部位
#include <GL/glut.h>
int angle[10]={0,0,0,0,0, 0,0,0,0,0};
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,1);
glutSolidTeapot(0.2);
glPushMatrix();
glTranslatef(0.2, 0,0 );
glRotatef(angle[0], 0,0,1);
glTranslatef(0.2, 0,0 );
glColor3f(1,0,0);
glutSolidTeapot(0.2);
glPushMatrix();
glTranslatef(0.2, 0,0);
glRotatef(angle[1], 0,0,1);
glTranslatef(0.2, 0,0);
glColor3f(1,1,0);
glutSolidTeapot(0.2);
glPopMatrix();
glPopMatrix();
glPushMatrix();
glTranslatef(-0.2, 0,0 );
glRotatef(angle[2], 0,0,1);
glTranslatef(-0.2, 0,0 );
glColor3f(0,1,0);
glutSolidTeapot(0.2);
glPushMatrix();
glTranslatef(-0.2, 0,0);
glRotatef(angle[3], 0,0,1);
glTranslatef(-0.2, 0,0);
glColor3f(0,0,1);
glutSolidTeapot(0.2);
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
int angleID=0;
int oldX, oldY;
void mouse(int button, int state, int x, int y)
{
oldX=x; oldY=y;
}
void motion(int x, int y)
{
angle[angleID] += (x-oldX);
oldX=x;
glutPostRedisplay();
}
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;
}
int main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("Week14 file");
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutKeyboardFunc(keyboard);
glutMainLoop();
}
❖ 自動存檔、顯示數值
#include <stdio.h> ❖ 新增整個函式
FILE * fout=NULL;
void saveAll()
{
if(fout==NULL) fout=fopen("motion.txt", "w+");
for(int i=0; i<10; i++)
{
printf( "%d ", angle[i]);
fprintf(fout, "%d ", angle[i]);
}
printf( "\n");
fprintf(fout, "\n");
}
void motion(int x, int y)
{
angle[angleID] += (x-oldX);
oldX=x;
saveAll(); ❖ 新增這行
glutPostRedisplay();
}
❖ 按r會重畫畫面
if(key=='r') ❖ 新增整個迴圈
{
if(fin==NULL) fin=fopen("motion.txt","r");
for(int i=0;i<10;i++)
{
fscanf(fin,"%d",&angle[i]);
}
glutPostRedisplay();
}
#include <GL/glut.h>
#include <stdio.h> ///TODO3: 外掛
///全域變數(global variable)最好放在最前面,放中間不好!!!!
FILE * fout=NULL; ///TODO3
FILE * fin=NULL; ///TODO4: 宣告檔案指標
int angle[10]={0,0,0,0,0, 0,0,0,0,0};
int angleID=0;
int oldX, oldY;
/// C/C++因為函式使用前, 要先宣告or定義, 有時候會順序不對
void display();
void motion(int x, int y);
void mouse(int button, int state, int x, int y);
void keyboard(unsigned char key, int x, int y);
void saveAll();
///可以在程式的最前面, 把全部的函式的外形, 先宣告一次
///(不要寫完整的定義)
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,1);
glutSolidTeapot(0.2);
glPushMatrix();
glTranslatef(0.2, 0,0 );
glRotatef(angle[0], 0,0,1);
glTranslatef(0.2, 0,0 );
glColor3f(1,0,0);
glutSolidTeapot(0.2);
glPushMatrix();
glTranslatef(0.2, 0,0);
glRotatef(angle[1], 0,0,1);
glTranslatef(0.2, 0,0);
glColor3f(1,1,0);
glutSolidTeapot(0.2);
glPopMatrix();
glPopMatrix();
glPushMatrix();
glTranslatef(-0.2, 0,0 );
glRotatef(angle[2], 0,0,1);
glTranslatef(-0.2, 0,0 );
glColor3f(0,1,0);
glutSolidTeapot(0.2);
glPushMatrix();
glTranslatef(-0.2, 0,0);
glRotatef(angle[3], 0,0,1);
glTranslatef(-0.2, 0,0);
glColor3f(0,0,1);
glutSolidTeapot(0.2);
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
void mouse(int button, int state, int x, int y)
{ ///TODO2:備份(old)mouse位置
oldX=x; oldY=y; ///TODO2:備份(old)mouse位置
}
void saveAll() ///TODO3: (自己寫的函式)全部存檔
{
if(fout==NULL) fout=fopen("motion.txt", "w+"); ///TODO3:開檔
for(int i=0; i<10; i++)
{ ///TODO3: for迴圈,把陣列全用
printf( "%d ", angle[i]); ///TODO3: 印畫面
fprintf(fout, "%d ", angle[i]); ///TODO3: 寫檔案
}
printf( "\n"); ///TODO3: 跳行, 畫面不會亂
fprintf(fout, "\n"); ///TODO3: 跳行, 畫面不會亂
}
void motion(int x, int y)
{ ///TODO2:滑動,更新 angleID對應的angle[]
angle[angleID] += (x-oldX);
oldX=x;
saveAll(); ///TODO3: (自己寫的函式)全部存檔
glutPostRedisplay(); ///TODO2:重畫畫面
}
void readAll()
{
if(fin==NULL) fin=fopen("motion.txt", "r"); ///TODO4 開檔
for(int i=0; i<10; i++)
{
fscanf(fin, "%d", &angle[i]);///TODO4 讀檔
}
}
void keyboard(unsigned char key, int x, int y)
{///TODO2: 鍵盤,選angleID
if(key=='0') angleID=0;
if(key=='1') angleID=1;
if(key=='2') angleID=2;
if(key=='3') angleID=3;
if(key=='r'){
readAll();
glutPostRedisplay();///TODO4 重畫
}
}
int main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("Week14 file");
glutDisplayFunc(display);
glutMouseFunc(mouse);///TODO2:備份(old)mouse位置
glutMotionFunc(motion);///TODO2:滑動,更新 angleID對應的angle[]
glutKeyboardFunc(keyboard);///TODO2: 鍵盤,選angleID
glutMainLoop();
}





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