WEEK04：
移動、旋轉、縮放
複習上週：move 移動
任務一：Transformation.exe
載data、win32、glut32.dll
解壓縮win32
glut32.dll、data放進wnidow資料夾
1.開啟Transformation.exe
2.按右鍵選取AI Capone，並拉動綠色的值，就可以調整模型的角度
(可參考"安培右手法則")
任務二：期中考
glPushMatrix(); //備份矩陣
glTranslatef(x,y,z); //移動
glRotatef(angle,x,y,z); //轉動
glScalef(x,y,z); //放大縮小
glBegin(GL_POLYGON); //開始畫
glColor3f(r,g,b); //顏色
glVertex3f(x,y,z); //頂點
glEnd(); //結束畫 glBegin()對應
glPopMatrix(); //還原矩陣
任務三：畫出可自動旋轉的茶壺
1.自動旋轉茶壺
#include <stdio.h>
#include <GL/glut.h>
float angle=0;
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angle,0,0,1); ///旋轉angle度
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
printf("%.1f\n",angle);
angle++; ///每次角度加1度
}
int main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("05160806_teapot_rotating");
glutIdleFunc(display);
glutDisplayFunc(display);
glutMainLoop();
}
2.手動旋轉茶壺(用滑鼠)
#include <stdio.h>
#include <GL/glut.h>
float angle=0;
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angle,0,0,1); ///旋轉angle度
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
angle++; ///每次角度加一度
}
void mouse(int button, int state, int x,int y)
{
}
void motion(int x, int y)
{///Now:當mouse在drag motion時
angle=x; ///改變angle值
glutPostRedisplay();
}
int main(int argc,char *argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("Week04");
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
}
3.最終版 (用滑鼠轉起來比較順了)
#include <stdio.h>
#include <GL/glut.h>
float angle=0,teapotX=0,teapotY=0;
int nowRotate=0,oldY=0,oldX=0;
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);///2種模式
glPushMatrix();
glTranslatef(teapotX,teapotY,0);
glRotatef(angle,0,0,1);///旋轉angle度
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();///交換畫面buffer便會顯示
///Now:printf("%.1f\n",angle);
}
void mouse(int button,int state,int x,int y)
{
if(button==GLUT_LEFT_BUTTON && state==GLUT_DOWN) nowRotate=1;
if(button==GLUT_RIGHT_BUTTON && state==GLUT_DOWN) nowRotate=0;
oldX=x;oldY=y;///Now2:按下去的時候,把oldX,oldY記起來!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
}
void motion(int x,int y)
{
if(nowRotate==1) angle+=(x-oldX);///Now:取改變angle值 ///Now2:加上改變量
else{
teapotX+=(x-oldX)/150.0;///Now2:加上改變量!!!!!!!!!!!!!!
teapotY+=(oldY-y)/150.0;///Now2:加上改變量!!!!!!!!!!!!!!
}
oldX=x;oldY=y;///Now2:做完計算時把oldX,oldY記起來!!!!!!!!!!
glutPostRedisplay();///Now:請畫面重畫
}
int main(int argc, char**argv)///進階的main()參數(個數,字串)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("Week04");
glutMouseFunc(mouse);//Now:mouse
glutMotionFunc(motion);//Now:motion
///Now:glutIdleFunc(disolay);///很閒/Idle,去重畫
glutDisplayFunc(display);///等一下樓上要準備 void display()
glutMainLoop();
}
