第10周 鍵盤滑鼠控制

用鍵盤a, b控制茶壺旋轉角度~

開小黑視窗，顯示出滑鼠游標在茶壺視窗的座標位置。

加入打光程式碼，呈現山寨三低感

將鍵盤控制住解掉，改為滑鼠拖曳控制

#include <GL/glut.h>

#include <stdio.h> 

float angleX=0, startX=0;

/*void keyboard(unsigned char key, int x, int y)//unsigned 代表沒有正負號，int x/y是坐標軸 

{

printf("%c  %d %d\n", key, x, y);

if(key=='a') angleX+=3;

if(key=='b') angleX-=3;

glutPostRedisplay();

}*/

void mouse(int button, int state, int x, int y)//012左鍵中鑑右鍵 , 01放開按下去, xy座標 

{

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

startX=x;

}

void motion(int x, int y)

{

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

angleX= x - startX;

glutPostRedisplay();

}

void myLight()//打光，開新專案從範例程式碼找有關鍵字light， 抄六行過來 

{

const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

glLightfv(GL_LIGHT0, GL_POSITION, light_position);

}

void display()

{

glEnable(GL_DEPTH_TEST);//打光要開深度測試 

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

glPushMatrix();

glRotatef(angleX, 0,1,0);

glutSolidTeapot(0.3);

glutSwapBuffers();

}

int main()

{

glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

glutCreateWindow("week10");

glutDisplayFunc(display);

//glutKeyboardFunc(keyboard);

glutMouseFunc(mouse);

glutMotionFunc(motion);

myLight(); 

glutMainLoop();

}

對x和y軸做旋轉

#include <GL/glut.h>

#include <stdio.h> 

float angleX=0, startX=0;//對X軸做轉動

float angleY=0, startY=0;//對Y軸做轉動 

/*void keyboard(unsigned char key, int x, int y)//unsigned 代表沒有正負號，int x/y是坐標軸 

{

printf("%c  %d %d\n", key, x, y);

if(key=='a') angleX+=3;

if(key=='b') angleX-=3;

glutPostRedisplay();

}*/

void mouse(int button, int state, int x, int y)//012左鍵中鑑右鍵 , 01放開按下去, xy座標 

{

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

startX=x;

startY=y;

}

void motion(int x, int y)

{

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

angleX+= x - startX; startX=x;//多加這行, startX=x;一定要和 angleX+= x - startX;寫同一行 

angleY+= y - startY; startY=y;//多加這行, 改用+= 不要用=, 而且startX會更新 

glutPostRedisplay();

}

void myLight()//打光，開新專案從範例程式碼找有關鍵字light， 抄六行過來 

{

const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

glLightfv(GL_LIGHT0, GL_POSITION, light_position);

}

void display()

{

glEnable(GL_DEPTH_TEST);//打光要開深度測試 

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

glPushMatrix();

glRotatef(angleX, 0,-1,0);

glRotatef(angleY, -1,0,0);

glutSolidTeapot(0.3);

glPopMatrix();

glutSwapBuffers();

}

int main()

{

glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

glutCreateWindow("week10");

glutDisplayFunc(display);

//glutKeyboardFunc(keyboard);

glutMouseFunc(mouse);

glutMotionFunc(motion);

myLight(); 

glutMainLoop();

}

#include <GL/glut.h>

#include <stdio.h> 

#include <math.h>

float angleX=0, startX=0;//對X軸做轉動

float angleY=0, startY=0;//對Y軸做轉動 

float m[16]= {1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1};//旋轉矩陣Rotation Matrix, 注意逗號 

/*void keyboard(unsigned char key, int x, int y)//unsigned 代表沒有正負號，int x/y是坐標軸 

{

printf("%c  %d %d\n", key, x, y);

if(key=='a') angleX+=3;

if(key=='b') angleX-=3;

glutPostRedisplay();

}*/

void mouse(int button, int state, int x, int y)//012左鍵中鑑右鍵 , 01放開按下去, xy座標 

{

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

startX=x;

startY=y;

}

void motion(int x, int y)

{

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

angleX= x - startX; startX=x;//多加這行, startX=x;一定要和 angleX+= x - startX;寫同一行 

angleY= y - startY; startY=y;//多加這行, 改用+= 不要用=, 而且startX會更新 ．

//再把+=改成=, 因為之後下面程式碼要把轉動累積起來了呃！ 

glutPostRedisplay();

}

void myLight()//打光，開新專案從範例程式碼找有關鍵字light， 抄六行過來 

{

const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

glLightfv(GL_LIGHT0, GL_POSITION, light_position);

}

void display()

{

glEnable(GL_DEPTH_TEST);//打光要開深度測試 

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

glPushMatrix();

float dist = sqrt(angleX*angleX+ angleY*angleY);//sqrt引入math.h 

glRotatef(dist, -angleY, -angleX, 0);

glMultMatrixf(m);

glGetFloatv(GL_MODELVIEW_MATRIX, m);//累積轉動 

//glRotatef(angleX, 0,-1,0);

//glRotatef(angleY, -1,0,0);

glutSolidTeapot(0.3);

glPopMatrix();

glutSwapBuffers();

}

int main()

{

glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

glutCreateWindow("week10");

glutDisplayFunc(display);

//glutKeyboardFunc(keyboard);

glutMouseFunc(mouse);

glutMotionFunc(motion);

myLight(); 

glutMainLoop();

}