2020/03/18-天氣晴

1.寫Mouse的函式

#include <GL/glut.h>
#include <stdio.h>
void display()
{
    ///glColor3f(1,0,0);
    glutSolidTeapot(0.3);///設定為實心的茶壺
    glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{
    printf("%d %d %d %d\n",button,state,x,y);
}
int main(int argc, char **argv)///*與[]等價
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("Week03");
    glutDisplayFunc(display);
    glutMouseFunc(mouse);///mouse的函式
    glutMainLoop();
}

2.寫移動glTranslatef(x,y,z)的函式

#include <GL/glut.h>
#include <stdio.h>
float teapotX=0,teapotY=0;///用變數-1~+1表示座標
void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);///清畫面
    glPushMatrix();///備份矩陣
        glTranslatef(teapotX,teapotY,0);///移動
        glutSolidTeapot(0.3);
    glPushMatrix();///備份矩陣
    glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{
    teapotX=(x-150)/150.0;///換算座標
    teapotY=-(y-150)/150.0;///y座標要反過來 加負號
}
int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("Week03");

    glutDisplayFunc(display);
    glutMouseFunc(mouse);///mouse的函式
    glutMainLoop();

}

3.寫Motiom的函式

#include <GL/glut.h>
void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);///清畫面
    glBegin(GL_POLYGON);
        glVertex2f((227-150)/150.0,-(132-150)/150.0);
        glVertex2f((151-150)/150.0,-(115-150)/150.0);
        glVertex2f((85-150)/150.0,-(141-150)/150.0);
        glVertex2f((118-150)/150.0,-(188-150)/150.0);
        glVertex2f((180-150)/150.0,-(186-150)/150.0);
    glEnd();
    glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{

}
int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("Week03");

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

}

HOMEWORK:照以上方法挑選圖案做出來！

#include <GL/glut.h>

#include <math.h>

void display()

{

    glClearColor(1,1,1,1);///背景白色

    float x=-0.45,y=0.2;///圓形位置

    ///glClearColor(0,0,0,0);

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glBegin(GL_POLYGON);///紅色長方形

    glColor3f(1,0,0);

    glVertex2f((41-150)/150.0,-(78-150)/150.0);

    glVertex2f((41-150)/150.0,-(244-150)/150.0);

    glVertex2f((260-150)/150.0,-(244-150)/150.0);

    glVertex2f((260-150)/150.0,-(78-150)/150.0);

    glEnd();

    glBegin(GL_POLYGON);///藍色長方形

    glColor3f(0,0,1);

    glVertex2f((41-150)/150.0,-(78-150)/150.0);

    glVertex2f((41-150)/150.0,-(150-150)/150.0);

    glVertex2f((130-150)/150.0,-(150-150)/150.0);

    glVertex2f((130-150)/150.0,-(78-150)/150.0);

    glEnd();

    glColor3f(1,1,1);///白色

    glBegin(GL_POLYGON);///圓形

    for (float a=0; a<=3.14; a+=0.01){

        glVertex2f(x+0.05*cos (a), y-0.05*sin (a) );

    }///圓形大小

    for (float a=0; a<=3.14; a+=0.01){

        glVertex2f(x+0.05*cos (a), y+0.05*sin (a) );

    }

    glEnd();

    glBegin(GL_POLYGON);

    glVertex2f((92-150)/150.0,-(99-150)/150.0);

    glVertex2f((95-150)/150.0,-(87-150)/150.0);

    glVertex2f((98-150)/150.0,-(97-150)/150.0);

    glEnd();

    glutSwapBuffers();

}

int main(int argc, char **argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("HW2");

    glutDisplayFunc(display);

    glutMainLoop();

}