今日天氣陰3/22WEEK05

1.電腦圖學之父Ivan Sutherland

2.jsyeh.org/3dcg10下載data.zip,windows

(1)keyboard函式(將滑鼠放在茶壺的視窗內，隨意按下鍵盤中的字元，顯示出所按的鍵及座標)

程式碼:

#include <GL/glut.h>

#include <stdio.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,0);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    printf("你按下了 %c 在 %d %d 座標\n",key,x,y);

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week04");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard); //keyboard函式

    glutMainLoop();

}

(2)  2-1. 鍵盤函式 glutKeyboardFunc()

    新增一個keyboard函式，讓按下鍵盤時，能夠得知當下滑鼠的座標

程式碼:

#include <GL/glut.h>

#include <stdio.h>

float x=0,y=0,z=0;

int oldX=0,oldY=0;

void display()

{

   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glPushMatrix();///備份矩陣

        glTranslatef((x-150)/150.0,-(y-150)/150.0,z);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard(unsigned char key,int mouseX,int mouseY)

{

}

void mouse(int bitton,int state,int mouseX,int mouseY)

{

}

void motion(int mouseX,int mouseY)

{

    x+=(mouseX-oldX); y+=(mouseY-oldY);

    oldX =mouseX;     oldY= mouseY;

    display();

}

int main (int argc,char**argv)

{

    glutInit( &argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week04 Rotate");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMotionFunc(motion);

    glutMouseFunc(mouse);

    glutMainLoop();

}

 2-2再新增一個新專案week05_keyboard_mouse_motion，接續上個程式week05_keyboard 變成 keyboard+mouse+motion

2-3.加入一個motion函式讓茶壺能夠跟著滑鼠移動

void motion(int mouseX,int mouseY)

{

    x+=(mouseX-oldX); y+=(mouseY-oldY);

    oldX =mouseX;     oldY= mouseY;

    display();

}

2-4.加入一個motion函式讓茶壺能夠跟著滑鼠移動

將滑鼠位址設成 oldx , oldy就可理了

void mouse(int bitton,int state,int mouseX,int mouseY)

{

    oldX= mouseX; oldY= mouseY;

}

2-5.將茶壺放大縮小

程式碼

:#include <GL/glut.h>

#include <stdio.h>

float x=150,y=150,z=0,scale=1.0;

    ///使茶壺在正中央

int oldX=0,oldY=0;

void display()

{

    glClearColor(0.5,0.5,0.5,1);///R G B A(為半透明，目前沒開)

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備分矩陣

        glTranslatef((x-150)/150.0,-(y-150)/150.0,z);

        glScalef(scale,scale,scale);///都縮放成scale倍

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard(unsigned char key,int mousex,int mousey)

{

}

void mouse(int botton,int state,int mousex,int mousey)

{

    oldX=mousex; oldY=mousey;

}

void motion(int mousex,int mousey)///用滑鼠移動茶壺

{

    if((mousex-oldX)>0)scale*=1.01;

    if((mousex-oldX)<0)scale*=0.99;

    //x+=(mousex-oldX); y+=(mousey-oldY);

    oldX=mousex; oldY=mousey;

    display();

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week05_keyboard_mouse_motion");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}