啵咕咕的筆記 week03

# week03 mouse

桌面裝 freeglut，把lib的libfreeglut.a複製改成 libglut32.a

開新專案，複製10行程式碼，再加3行

#include <stdio.h>

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

{

    printf("Hello Mouse!\n");

}

 glutMouseFunc(mouse);

把hello mouse 改掉 印參數

printf("%d %d %d %d\n", button , state, x, y);

}

再改 滑鼠寫程式

if(state==GLUT_DOWN)

        printf("glVertex2f((%d-150)/150.0), -(%d-150)/150.0);\n", x, y);

#看課本範例

請到jsyeh.org/3dcg10下載課本範例 data.zip windows.zip

windows.zip-transformation.exe

data.zip-windows\data  一堆模型檔

試試 transformation.exe

glTranslatef(x,y,z)

glRotatef(角度,x,y,z)

## week03_mouse_glTranslatef

先偷原本46.49.54  程式碼 和上一個的

float teapotX = 0, teapotY = 0;

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

{

    teapotX = (x-150)/150.0;

    teapotY = -(y-150)/150.0;

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(teapotX, teapotY, 0);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers();

}

# 轉動---右手定則(讚)

轉動軸--拇指，方向為其他手指握的方向

拇指:   x--右 y--上 z-- 對著自己 

#week03_glRotatef

新專案，把上一個程式碼拿來用

增加 float angle = 0

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle, 0, 0, 1);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers();

}

void motion(int x, int y)

{

    angle = x;

    display();

}

下面再加glutMotionFunc(motion);

#week03_mouse_translate_rotate

前一個程式碼拿來用

#include <GL/glut.h>

#include <stdio.h>

float teapotX = 0, teapotY = 0;

float angle = 0;

int method = 1;

int oldX = 0, oldY = 0;

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

{

    oldX = x;

    oldY = y;

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glTranslatef(teapotX, teapotY, 0);

        glRotatef(angle, 0, 0, 1);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers();

}

void motion(int x, int y)

{

    if(method==1){

        angle += x-oldX;

    }else if(method==2){

        teapotX += (x-oldX)/150.0;

        teapotY -= (y-oldY)/150.0;

    }

    oldX = x;

    oldY = y;

    display();

}

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

{

    if(key=='e') method = 1;

    if(key=='w') method = 2;

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("2024電腦圖學第03週");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}