今天一開始老師像我們介紹電腦圖學之父Ivan Sutherland
然後一樣去https://jsyeh.org/3dcg10/網頁裡下載data和win32
打開transformation.exe後試著調整glScalef的數值
然後開啟codeblocks
貼上之前的程式碼
並且稍作修改，加上keyboard函式
按下鍵盤任一按鍵後，會顯示你按下的鍵和目前滑鼠所在的位置座標
#include <GL/glut.h>
#include <stdio.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,0);///黃色的
glutSolidTeapot(0.3);///茶壺
glutSwapBuffers();
}
void keyboard(unsigned char key,int x,int y)
{
printf("你按下了 %c 在 %d %d 座標\n",key,x,y);
}
int main(int argc,char** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week05");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMainLoop();
}
然後我們接續剛剛的程式碼
改成keyboard+mouse+motion
#include <GL/glut.h>
#include <stdio.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1,1,0);///黃色的
glutSolidTeapot(0.3);///茶壺
glutSwapBuffers();
}
void keyboard(unsigned char key,int x,int 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_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week05");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
}
之後我們再加上motion的程式碼
讓茶壺能夠跟著滑鼠移動
#include <GL/glut.h>
#include <stdio.h>
float x=0,y=0,z=0;
int oldX=0,oldY=0;
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);///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)
{
}
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_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week05");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
}
並且加上背景顏色的程式碼glClearColor()
#include <GL/glut.h>
#include <stdio.h>
float x=150,y=150,z=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);
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)
{
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();
}
然後我們可以透過scale數值來調整茶壺大小
如果往右邊拉，oldX就會大於0，此時我們就把scale*1.01讓茶壺放大
如果往左邊拉，oldX就會小於0，此時我們就把scale*0.99讓茶壺縮小
#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();
}
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