week4_JN小天地

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以上是期中考會考的東西，

照著老師說的按了- 使點變少
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float angle=0;
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glRotatef(angle,0,0,1);
        glutSolidTeapot(0.3);
    glPopMatrix();
    glutSwapBuffers();
    angle++;
}
int main(int argc,char*argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("Week 04 transformation");

    glutIdleFunc(display);
    glutDisplayFunc(display);
    glutMainLoop();
}
改變角度 讓茶壺一直轉

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#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);
        glutSolidTeapot(0.3);
    glPopMatrix();
    glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{

}
void motion(int x,int y)
{
    angle=x;
    glutPostRedisplay();
}
int main(int argc,char*argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("Week 04 transformation");
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutDisplayFunc(display);
    glutMainLoop();
}

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#include <stdio.h>
#include <GL/glut.h>
float angle=0, teapotX=0 , teapotY=0;  加上移動的座標
int oldX=0, oldY=0, nowRotate=0;    translate,1;rotate
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();   //備份數據
        glTranslatef(teapotX, teapotY,0);  轉完的茶壺在做移動
        glRotatef(angle,0,0,1);    選轉angle角度
        glutSolidTeapot(0.3);
    glPopMatrix();  還原矩陣
    glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{
    if(button==GLUT_LEFT_BUTTON && state==GLUT_DOWN) nowRotate=1; 如果是左鍵 旋轉
    if(button==GLUT_RIGHT_BUTTON&& state==GLUT_DOWN) nowRotate=0; 如果是右鍵 移動
    oldX=x; oldY=y;  按下去的時候 把oldx oldy記起來
}
void motion(int x,int y)
{   
    if(nowRotate==1) angle += (x-oldX);
    else{
        teapotX += (x-oldX)/150.0;  去改變angle值 加上改變量
        teapotY += (oldY-y)/150.0;  加上改變量
    }
    oldX=x; oldY=y;
    glutPostRedisplay();
}
int main(int argc,char*argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("Week 04 transformation");
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutDisplayFunc(display);
    glutMainLoop();
}