Week 5 P.L 課堂筆記

One. 移動 (Translate)

#include <GL/glut.h>

float mouseX=0 , mouseY=0;

void display(){

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///back up the Matrix.

        glTranslatef(mouseX,mouseY,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void motion(int x,int y)

{

    mouseX = (x-150)/150.0;

    mouseY = -(y-150)/150.0;

    glutPostRedisplay();

}

int main(int argc, char **argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Rotate / Translate / Scale");

    glutDisplayFunc(display);

    //glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

Two. 縮放 (Scale)

glScalef(mouseX,mouseY,0);