week06轉動移動茶壺

複習上周
https://2020graphicsb.blogspot.com/2020/03/week05_31.html

移動茶壺

移動或轉動茶壺

移動、轉動用Keyboard切換(w、e)

執行結果

程式碼

#include <GL/glut.h>
///打光的第0步,宣告陣列,裡面有光的屬性值
const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };///ambient無所不在的光
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };///diffuse當角度不同時光的能量就會有所不同,因此可能某些角度比較亮
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };

int type=1;
float teapotX=0,teapotY=0;///TODO1:
float teapotRotY=0;///轉動的變數
int oldX=0,oldY=0;///TODO1:
void mouse(int button,int state,int x,int y)
{///TODO1:mouse要可以移動teapot Step1:按下去
    oldX=x;///TODO1
    oldY=y;///TODO1
}
void motion(int x,int y)///TODO1:Step2:motion動
{
    if(type==1)///轉動
    {
        teapotRotY+=x-oldX;
    }
    else if(type==2)///移動
    {
        teapotX+=x-oldX;///TODO1
        teapotY+=y-oldY;///TODO1
    }
    oldX=x;///TODO1
    oldY=y;///TODO1
    glutPostRedisplay();///TODO1更新畫面
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glPushMatrix();///備份矩陣
      glTranslatef(teapotX/250.0,-teapotY/250.0,0);///TODO1移動
      glRotatef(teapotRotY,0,-1,0);///x方向的動,y軸
     glutSolidTeapot(0.3);///TODO2
    glPopMatrix();///備份矩陣
    glutSwapBuffers();
}
#include <stdio.h>
void keyboard(unsigned char key,int x,int y)
{///unsigned char key沒有正負號,全部都當正號用
    if(key=='e'||key=='E')type=1;///maya:轉動
    if(key=='w'||key=='W')type=2;///maya:轉動
    printf("now: %c\n",key);
}

int main(int argc,char *argv[])
{
    glutInit(&argc, argv);
    glutInitWindowSize(500,500);
    glutInitWindowPosition(10,10);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);
    glutMouseFunc(mouse);///TODO
    glutMotionFunc(motion);///TODO1
    glutKeyboardFunc(keyboard);///TODO2

    ///打光3D深淺
    glEnable(GL_DEPTH_TEST);

    ///打光1:開啟光線
    glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);
///打光2:要設定light的設定值(前面是陣列)
    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
///打光2.2:物體也設定material
    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);
    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);
    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

    glutMainLoop();
    return EXIT_SUCCESS;
}

自動轉動茶壺

解釋移動跟轉動