week05

                                              主題:移動/旋轉/縮放/矩陣/鍵盤+滑鼠

#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();

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

        glScalef(scale,scale,scale);///都縮放成scale倍

        glColor3f(1,1,0);///黃色的

        glutSolidTeapot(0.3);///茶壺

    glPopMatrix();

    glutSwapBuffers();

}

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

{

}

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

{

    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");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}