⚝ YI-ZHEN的筆記 week06

 

• 電腦圖學之父 - Ivan Sutherland (伊凡·蘇澤蘭)

介紹影片: https://www.youtube.com/watch?v=6orsmFndx_o

• 課堂範例: https://jsyeh.org/3dcg10/

 1. 自轉

2. 公轉

• Keyboard函式 (鍵盤)

#include <GL/glut.h>

#include <stdio.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glColor3f(1, 0, 0);

        glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    printf("現在按下:%c 座標在:%d %d\n",key, x, y);

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06-keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(Keyboard);

    glutMainLoop();

}

• Keyboard+Mouse+Motion 函式 

 1.  將mouse函式及motion函式的雛形先寫出來

#include <GL/glut.h>

#include <stdio.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glColor3f(1, 0, 0);

        glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    printf("現在按下:%c 座標在:%d %d\n",key, x, 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("week06-keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(Keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

2. 移動位置

#include <GL/glut.h>

#include <stdio.h>

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

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glTranslatef( (x-150)/150.0, -(y-150)/150.0, z); ///Maya => w

        glColor3f(1, 0, 0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

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

{

    printf("現在按下:%c 座標在:%d %d\n",key, x, y);

}

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

{

    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("week06-keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(Keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

3. 調整縮放

#include <GL/glut.h>

#include <stdio.h>

float x=0, y=0, z=0, scale=1.0, oldX, oldY;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glScalef(scale, scale, scale); ///Maya => r

        glColor3f(1, 0, 0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

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

{

    printf("現在按下:%c 座標在:%d %d\n",key, x, y);

}

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

{

    oldX= mouseX;

    oldY= mouseY;

}

void motion(int mouseX, int mouseY)

{

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

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

    oldX= mouseX; oldY= mouseY;

    display();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06-keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(Keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

4. 鍵盤 (w/W) 移動、(e/E) 旋轉、(r/R) 縮放 切換想要的行為

#include <GL/glut.h>

#include <stdio.h>

float x=0, y=0, z=0, scale=1.0, angle=0.0, oldX, oldY;

int now=1;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glTranslatef( (x-150)/150.0, -(y-150)/150.0, z); ///Maya => w

    glRotatef(angle, 0, 0, 1); ///Maya => e

    glScalef(scale, scale, scale); ///Maya => r

        glColor3f(1, 0, 0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

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

{

    if(key == 'w' || key == 'W') now=1; ///移動

    if(key == 'e' || key == 'E') now=2; ///旋轉

    if(key == 'r' || key == 'R') now=3; ///縮放

}

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

{

    oldX= mouseX;

    oldY= mouseY;

}

void motion(int mouseX, int mouseY)

{

    if(now == 1){ ///移動

        x += (mouseX-oldX);

        y += (mouseY-oldY);

    }

    else if(now == 3){ ///縮放

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

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

    }

    oldX= mouseX; oldY= mouseY;

    display();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06-keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(Keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

5. 旋轉 + 調整視窗大小，並將茶壺原是位置移至正中心

#include <GL/glut.h>

#include <stdio.h>

float x=250, y=250, z=0, scale=1.0, angle=0.0, oldX, oldY;

int now=1;

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1); ///用來clear的色彩 R G B A 其中Alpha(半透明)暫沒用到

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glTranslatef( (x-250)/250.0, -(y-250)/250.0, z); ///Maya => w

    glRotatef(angle, 0, 0, 1); ///Maya => e

    glScalef(scale, scale, scale); ///Maya => r

        glColor3f(1, 1, 0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

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

{

    if(key == 'w' || key == 'W') now=1; ///移動

    if(key == 'e' || key == 'E') now=2; ///旋轉

    if(key == 'r' || key == 'R') now=3; ///縮放

}

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

{

    oldX= mouseX;

    oldY= mouseY;

}

void motion(int mouseX, int mouseY)

{

    if(now == 1){ ///移動

        x += (mouseX-oldX);

        y += (mouseY-oldY);

    }

    else if(now == 2){

        angle += (mouseX-oldX);

    }

    else if(now == 3){ ///縮放

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

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

    }

    oldX= mouseX; oldY= mouseY;

    display();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutInitWindowSize(500,500);

    glutCreateWindow("week06-keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(Keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}