week 04 林郁珊

複習上週mouse移動

1. 將data.zip, windows.zip, glut32.dll下載至桌面

2. 解壓縮，並將data, glut32.dll放進windows

3. 打開transformation.exe

4. 測試x,y,z軸如何旋轉

做出可旋轉茶壺

1. 建立一個專案(glut)

2. 刪除全部程式碼，重新撰寫

#include <GL/glut.h>

#include <stdio.h>

float teapotX=0,teapotY=0,angle=0;//加一個angle

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(teapotX, teapotY, 0);

        glRotatef(angle,0,0,1);//增加旋轉角

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void motion(int x, int y)

{

    angle =x;//將角度設為x

    glutPostRedisplay();

}

int main(int argc, char **argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week03 Mouse");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

    glutMainLoop();

}

讓茶壺轉動及移動更順利

#include <GL/glut.h>

#include <stdio.h>

float teapotX=0,teapotY=0,angle=0;

int oldX=0, oldY=0, nowRotate=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(teapotX, teapotY, 0);

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void motion(int x, int y)

{

    if(nowRotate==1)angle += (x-oldX);

    else

    {

        teapotX += (x-oldX)/150.0;//利用移動量再移動

        teapotY += (oldY-y)/150.0;//利用移動量再移動

    }

    oldX=x; oldY=y;

    glutPostRedisplay();

}

void mouse(int button, int state, int x, int y)

{

    if(button==GLUT_LEFT_BUTTON && state==GLUT_DOWN) nowRotate=1;
//按滑鼠左鍵旋轉

    if(button==GLUT_RIGHT_BUTTON && state==GLUT_DOWN) nowRotate=0;
//按滑鼠右鍵移動

    oldX=x; oldY=y;

}

int main(int argc, char **argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week03 Mouse");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);//滑鼠事件

    glutMotionFunc(motion);

    glutMainLoop();

}