1. 電腦圖學之父 Ivan Sutherland (Sketchpad)
https://www.youtube.com/watch?v=6orsmFndx_o
2.1下載Win32的Example範例
https://jsyeh.org/3dcg10/
下載[data].[win32]
2.2 windows.zip解壓縮至"windows\"
2.3 將data移至windows
2.4 打開Transformation.exe
3.下方點擊右鍵可切換公轉及自轉 [s] Swap translate/rotate 
4.撰寫程式,利用鍵盤按鍵紀錄座標
#include <GL/glut.h>
#include <stdio.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,0);
glutSolidTeapot(0.3);
glutSwapBuffers();
}
void keyboard(unsigned char key,int x,int y)
{
printf("現在按下:%c 座標在:%d %d\n",key,x,y);
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week06 keyboard");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMainLoop();
}
5.(4.)加上 mouse() 及 motion()函式
#include <GL/glut.h>
#include <stdio.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,0);
glutSolidTeapot(0.3);
glutSwapBuffers();
}
void keyboard(unsigned char key,int x,int y)
{
printf("現在按下:%c 座標在:%d %d\n",key,x,y);
}
void mouse(int button,int state,int x,int y)
{
}
void motion(int x,int y)
{
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week06 keyboard mouse motion");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMainLoop();
glutMouseFunc(mouse);
glutMotionFunc(motion);
}
6.使用滑鼠拖曳茶壺
#include <GL/glut.h>
#include <stdio.h>
float x=0,y=0,z=0,oldX,oldY;
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef((x-150)/150.0,-(y-150)/150.0,z);
glColor3f(1,1,0);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
void keyboard(unsigned char key,int mouseX,int mouseY)
{
printf("現在按下:%c 座標在:%d %d\n",key,mouseX,mouseY);
}
void mouse(int button,int state,int mouseX,int mouseY)
{
oldX=mouseX;oldY=mouseY;
}
void motion(int mouseX,int mouseY)
{
x+=(mouseX-oldX);
y+=(mouseY-oldY);
oldX=mouseX;oldY=mouseY;
display();
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week06 keyboard mouse motion");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
}
7.利用滑鼠縮放茶壺
#include <GL/glut.h>
#include <stdio.h>
float x=0,y=0,z=0,scale=1.0,oldX,oldY;
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
///glTranslatef((x-150)/150.0,-(y-150)/150.0,z);
glScalef(scale,scale,scale);
glColor3f(1,1,0);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
void keyboard(unsigned char key,int mouseX,int mouseY)
{
printf("現在按下:%c 座標在:%d %d\n",key,mouseX,mouseY);
}
void mouse(int button,int state,int mouseX,int mouseY)
{
oldX=mouseX;oldY=mouseY;
}
void motion(int mouseX,int mouseY)
{
if(mouseX>oldX)scale=scale*1.01;
if(mouseX<oldY)scale=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_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week06 keyboard mouse motion");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
}
8.點擊鍵盤按鍵r或w後,可使用滑鼠縮放或移動茶壺
#include <GL/glut.h>
#include <stdio.h>
float x=0,y=0,z=0,scale=1.0,angle=0.0,oldX,oldY;
int now=1;
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef((x-150)/150.0,-(y-150)/150.0,z);
glRotatef(angle,0,0,1);
glScalef(scale,scale,scale);
glColor3f(1,1,0);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
void keyboard(unsigned char key,int mouseX,int mouseY)
{
if(key=='w' || key=='W')now=1;
if(key=='e' || key=='E')now=2;
if(key=='r' || key=='R')now=3;
}
void mouse(int button,int state,int mouseX,int mouseY)
{
oldX=mouseX;oldY=mouseY;
}
void motion(int mouseX,int mouseY)
{
if(now==1){
x+=(mouseX-oldX);
y+=(mouseY-oldY);
}else if(now==3){
if(mouseX>oldX)scale=scale*1.01;
if(mouseX<oldY)scale=scale*0.99;
}
oldX=mouseX;oldY=mouseY;
display();
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week06 keyboard mouse motion");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
}
9.glClearColor(0.5,0.5,0.5,1);改變背景顏色,(8)加上點擊鍵盤按鍵e後,可使用滑鼠旋轉茶壺
#include <GL/glut.h>
#include <stdio.h>
float x=250,y=250,z=0,scale=1.0,angle=0.0,oldX,oldY;
int now=1;
void display()
{
glClearColor(0.5,0.5,0.5,1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef((x-250)/250.0,-(y-250)/250.0,z);
glRotatef(angle,0,0,1);
glScalef(scale,scale,scale);
glColor3f(1,1,0);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
void keyboard(unsigned char key,int mouseX,int mouseY)
{
if(key=='w' || key=='W')now=1;
if(key=='e' || key=='E')now=2;
if(key=='r' || key=='R')now=3;
}
void mouse(int button,int state,int mouseX,int mouseY)
{
oldX=mouseX;oldY=mouseY;
}
void motion(int mouseX,int mouseY)
{
if(now==1){
x+=(mouseX-oldX);
y+=(mouseY-oldY);
}else if(now==2){
angle+=(mouseX-oldX);
}else if(now==3){
if(mouseX>oldX)scale=scale*1.01;
if(mouseX<oldY)scale=scale*0.99;
}
oldX=mouseX;oldY=mouseY;
display();
}
int main(int argc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize(500,500);
glutCreateWindow("week06 keyboard mouse motion");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
}
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