AhFatKr的電腦圖學筆記week05

 0. 一開始介紹了電腦圖學之父Ivan Sutherland

播放了Ivan Sutherland的sketchpad影片

介紹他的老師Claude Elwood Shannon的終極機器

1. https://jsyeh.org/3dcg10/(下載範例):data.zip,windows.zip,glut32.dll三個檔案

     windows.zip解壓後=>下載\windows\shapes.exe

    data.zip=先解壓在本的地方,再放進下載\windows\data\模型

    glut32.dll複製後=>下載\windows\glut32.dll

2.開啟codeblock主題keyboard

    把每次的十行寫上去

3.加入前幾週所學的motion及mouse以及備份矩陣

4.為了讓滑鼠拖動茶壺時不要有奇怪的導向,修改了一些值

5.加入scale放大縮小功能

#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);

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

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

        glScalef(scale, scale, scale);

        glColor3f(1,1,0);///黃的

        glutSolidTeapot( 0.3 );///茶壺

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard( unsigned char key, int mouseX, int mouseY )

{

}

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 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);///今日主角

    glutMouseFunc(mouse);///上上週主角

    glutMotionFunc(motion);///上週主角

    glutMainLoop();

}