week 03

#mouse滑鼠

1.桌面葉正聖上課用軟體freeglut安裝 拉桌面，再把libfreeglut.a複製成libglut32.a

2.CodeBlocks File-New-Project,GLUT專案，week03_mouse

3.把blog/github的10行程式碼貼進來

4.再三行

#include <stdio.h>為了printf()

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

     printf("Hello World\n");

}

glutCreateWindow()之後，在 glutDisplayFunc(display);後面加

     glutMouseFunc(mouse);

5.茶壺座標printf("%d %d %d\n",button ,state ,x, y);

button :0左鍵 1:中鍵 2.右鍵

6:移動茶壺

#include <GL/glut.h>

#include <Stdio.h>

float teapotX=0,teapotY=0;

void display()

{

glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);

glPushMatrix();///被分矩陣

glTranslatef(teapotX,teapotY,0);

glutSolidTeapot(0.3);

glPopMatrix();

glutSwapBuffers();

}

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

{

  teapotX=(x-150)/150.0;

  teapotY=-(y-150)/150.0;

}

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

{

    glutInit(&argc, argv);///140

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);///143

    glutCreateWindow("week03 mouse glTranslatef");///145

     glutDisplayFunc(display);///148

     glutMouseFunc(mouse);///148

     glutMainLoop();///174

}

須知:需要用安培右手定律,其中Z軸是最難移動,

   

*程式碼#include <GL/glut.h>

#include <Stdio.h>

float teapotX=0,teapotY=0;

float angle=0;

void display()

{

glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);

glPushMatrix();///被分矩陣

glTranslatef(teapotX,teapotY,0);///座標移動

glRotated(angle,0,0,1);///最難的z軸

glutSolidTeapot(0.3);

glPopMatrix();///還原矩陣

glutSwapBuffers();

}///

int method=1;

int oldx=0,oldy=0;

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

{

  ///teapotX=(x-150)/150.0;

  ///teapotY=-(y-150)/150.0;

  oldx=x;

  oldy=y;

}

void motion(int x,int y)

{

   if(method==1){

    angle=x;

   }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=='c') method=1;///旋轉Rotate

    if(key=='w') method=2;///移動Translate

}

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

{

    glutInit(&argc, argv);///140

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);///143

    glutCreateWindow("week03 mouse glTranslatef");///145

     glutDisplayFunc(display);///148

     glutMouseFunc(mouse);///148

     glutMotionFunc(motion);

     glutKeyboardUpFunc(keyboard);

     glutMainLoop();///174

}

2:旋轉茶壺

#include <GL/glut.h>

#include <Stdio.h>

float teapotX=0,teapotY=0;

float angle=0;

void display()

{

glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);

glPushMatrix();///被分矩陣

///glTranslatef(teapotX,teapotY,0);吧座標移動

  glRotated(angle,0,0,1);///最難的z軸

  glutSolidTeapot(0.3);

glPopMatrix();///還原矩陣

glutSwapBuffers();

}///

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

{

  teapotX=(x-150)/150.0;

  teapotY=-(y-150)/150.0;

}

void motion(int x,int y)

{

    angle=x;

    display();

}

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

{

    glutInit(&argc, argv);///140

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);///143

    glutCreateWindow("week03 mouse glTranslatef");///145

     glutDisplayFunc(display);///148

     glutMouseFunc(mouse);///148

     glutMotionFunc(motion);

     glutMainLoop();///174

}

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