圖學筆記week05

第一節:做出按下鍵盤按鍵印出滑鼠所在的座標

\\\

#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("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}

\\\

第二節

第一次程式碼:

\\\

#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();

}

\\\

第二次程式碼:

\\\

#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 button, 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("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion)

    glutMainLoop();

}

\\\

第三次程式碼:

因為第二次程式碼茶壺會瞬間移動，所以為了解決這件事，加了一條程式碼

\\\

#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);///R, G, B, A其中A半透明功能,目前沒開 

    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 button, int state, int mouseX, int mouseY)

{///為了修飾瞬間移動的錯誤，改加了這條程式碼

    oldX =mouseX; oldY =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("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion)

    glutMainLoop();

}

\\\

第三節

第一次程式碼:

\\\

#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);///R, G, B, A其中A半透明功能,目前沒開

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

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

        glScalef(scale, scale, scale);

        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 button, int state, int mouseX, int mouseY)

{///為了修飾瞬間移動的錯誤，改加了這條程式碼

    oldX =mouseX; oldY =mouseY;

}

void motion(int mouseX, int mouseY)

{

    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");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

\\\