week05 KEYBOARD 筆記

 WEEK05  KEYBOARD

step02-1接續剛剛的keyboard，開一個新的專案，week05_keyboard_mouse_motion

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)

{

}

void mouse (int button,int state,int x,int y)

{

}

void motion(int x,int y)

{

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

step02-2先做移動 利用motion裡面

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

讓 x 及 y能夠增減

接著用減一半、除一半、y要倒過來的公式完成移動

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();

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

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

        glPopMatrix();

        glutSwapBuffers();

}

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

{

}

void mouse (int button,int state,int x,int y)

{

}

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("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

step02-3接著調整顏色，修正茶壺位子

#include <GL/glut.h>

#include <stdio.h>

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

int oldX=0, oldY=0;

void display()

{

    glClearColor( 0.5, 0.5, 0.5, 1 );

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

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

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

        glPopMatrix();

        glutSwapBuffers();

}

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

{

}

void mouse (int button,int state,int x,int y)

{

}

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("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

step-03縮放

利用 scale 做縮放

程式碼:

#include <GL/glut.h>

#include <stdio.h>

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

int oldX=0, oldY=0;

void display()

{

    glClearColor( 0.5, 0.5, 0.5, 1 );

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

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

        glScalef(scale, scale, scale);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

        glPopMatrix();

        glutSwapBuffers();

}

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

{

}

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

{

    oldX = mouseX; oldY = mouseY;

}

void motion(int mouseX,int mouseY)

{

    if( mouseX-oldX > 0) scale *= 1.01;

    if( mouseX-oldX < 0) scale *= 0.99;

    oldX = mouseX;      oldY = mouseY;

    display();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}