Dubi week04

 Week04

glScalef(x,y,z) ///縮放

## week04_mouse_glscalef 

1.安裝freeglut,同時把lib\libfreeglut.a 複製成 libglut32.a

2.flie-new-project, glut 專案

3.程式碼

#include <GL/glut.h>

void display()

 {

    glClearColor(1,1,0.9,1); ///顏色

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3f(0,1,0); 

    glutSolidTeapot( 0.3 );

    glutSwapBuffers();

 }

int main(int argc, char *argv[])

 {

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week04_mouse_glScalef");

    glutDisplayFunc(display);

    glutMainLoop();

 }

##week04_translate_rotate_scale

1.  file_new_ project, GLUT專案  week04_translate_rotate_scale

##week04_rotate_translate_scale (茶壺轉圈圈) => 逆時針 

1.程式碼

#include <GL/glut.h>

float teapotX = 0.5,teapotY = 0;
float angle = 0;
float s = 0.3;
void display()
{///設定 顏色
    glClearColor(1,1,0.9,1);///顏色R,G,B,A
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glColor3f(0,1,0);
    glPushMatrix();///備份矩陣
        glRotatef(angle++,0,0,1);
        glTranslatef(teapotX,teapotY,0);
        glScalef(s,s,s);
        glutSolidTeapot( 0.3 );
    glPopMatrix();
    glutSwapBuffers();
}
void motion(int x,int y)
{
    s = 1 + (x-150)/150.0;
    display();
}
int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("week04_mouse_glScalef");
    glutIdleFunc(display);
    glutDisplayFunc(display);
    glutMotionFunc(motion);
    glutMainLoop();
}

1. 按滑鼠自動貼上茶壺

2. 程式碼

#include <GL/glut.h>

#include <stdio.h>

int N = 0;

float teapotX[1000],teapotY[1000];

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    for(int i=0; i<N; i++){

        glPushMatrix();

            glTranslatef(teapotX[i],teapotY[i],0);

            glutSolidTeapot( 0.1 );

        glPopMatrix();

    }

    glutSwapBuffers();

}

void keyboard(unsigned char key,int x,int y){

    printf("key:%c  x:%d  y:%d\n",key,x,y);

}

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

    teapotX[N] = (x-150)/150.0;

    teapotY[N] = -(y-150)/150.0;

    N++;

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week04_keyboard_mouse_motion");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMainLoop();

}