移動!旋轉!縮放!
1.先寫個茶壺
#include <GL/glut.h> ///使用GLUT外掛
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);///清空
glutSolidTeapot(0.3);
glutSwapBuffers(); ///交換兩倍的buffers
}
int main(int argc,char ** argv)
{
glutInit(&argc,argv); ///GLUT初始設定
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH); ///顯示模式
glutCreateWindow("08160554"); ///開窗
glutDisplayFunc(display); ///等一下要顯示的函示
glutMainLoop(); ///主要迴圈
}
2.加點程式
滑鼠左鍵button:0
滑鼠中鍵button:1
滑鼠右鍵button:2
按下去state:0
放開state:1
#include <GL/glut.h> ///使用GLUT外掛
#include <stdio.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);///清空
glutSolidTeapot(0.3);
glutSwapBuffers(); ///交換兩倍的buffers
}
void mouse(int button,int state,int x,int y)
{
printf("button:%d state:%d x:%d
y:%d\n",button,state,x,y);
}
int main(int argc,char ** argv)
{
glutInit(&argc,argv); ///GLUT初始設定
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH); ///顯示模式
glutCreateWindow("08160554"); ///開窗
glutDisplayFunc(display); ///diaplay顯示的函式
glutMouseFunc(mouse); ///mouse滑鼠的程式
glutMainLoop(); ///主要迴圈
}
3.讓滑鼠點的地方顯示出座標程式
#include <GL/glut.h>
#include <stdio.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glutSolidTeapot(0.3);
glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{
if(state==GLUT_DOWN) ///如果 mouse 按下去，印出程式碼
{
printf(" glVertex3f((%d-150)/150.0,-(%d-
150)/150.0,0);\n",x,y);
}
}
int main(int argc,char ** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("08160554");
glutDisplayFunc(display); ///diaplay顯示的函式
glutMouseFunc(mouse); ///mouse滑鼠的程式
glutMainLoop();
}
4.把出現的座標程式貼在程式裡，就能畫出東西
#include <GL/glut.h>
#include <stdio.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_POLYGON);
glVertex3f((118-150)/150.0,-(129-150)/150.0,0);
glVertex3f((112-150)/150.0,-(140-150)/150.0,0);
glVertex3f((110-150)/150.0,-(149-150)/150.0,0);
glVertex3f((107-150)/150.0,-(163-150)/150.0,0);
glVertex3f((109-150)/150.0,-(176-150)/150.0,0);
glVertex3f((117-150)/150.0,-(183-150)/150.0,0);
glVertex3f((117-150)/150.0,-(188-150)/150.0,0);
glVertex3f((177-150)/150.0,-(184-150)/150.0,0);
glVertex3f((181-150)/150.0,-(184-150)/150.0,0);
glVertex3f((158-150)/150.0,-(114-150)/150.0,0);
glVertex3f((141-150)/150.0,-(111-150)/150.0,0);
glVertex3f((150-150)/150.0,-(125-150)/150.0,0);
glVertex3f((120-150)/150.0,-(130-150)/150.0,0);
glVertex3f((105-150)/150.0,-(165-150)/150.0,0);
glEnd();
glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{
if(state==GLUT_DOWN) ///如果 mouse 按下去，印出程式碼
{
printf(" glVertex3f((%d-150)/150.0,-(%d-150)/150.0,0);\n",x,y);
}
}
int main(int argc,char ** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("08160554");
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMainLoop();
}
5.要開始移動的PART
#include <GL/glut.h>
#include <stdio.h>
float teapotX=0,teapotY=0; ///茶壺的座標-1.0...+1.0
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix(); ///矩陣備份
glTranslatef(teapotX,teapotY,0); ///照著座標移動
glutSolidTeapot(0.3);
glPopMatrix(); ///矩陣還原
glEnd();
glutSwapBuffers();
}
void motion (int x,int y) ///mouse motion 的函式
{
teapotX=(x-150)/150.0; ///座標換算
teapotY=-(y-150)/150.0;
}
int main(int argc,char ** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("08160554");
glutDisplayFunc(display);
glutMotionFunc(motion); ///準備 mouse motion移動時的函式
glutMainLoop();
}
6.Transformation
移動:glTranslatef
旋轉:glRotatef
大小:glScalef
重設:R
🌈旋轉的其他值改變會大有不同🌈
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