mouse_move2

#define GLUT_LEFT_BUTTON0
#define GLUT_MIDDLE_BUTTON1
#define GLUT_RIGHT_BUTTON2
#define GLUT_DOWN0
#define GLUT_UP1
#include <stdio.h>
#include <stdlib.h>
#include <GLUT/glut.h>
float shiftX,shiftY;
float mouseX,mouseY;
void display(void)
{

    glClear(GL_COLOR_BUFFER_BIT);
    glTranslatef(shiftX,shiftY,0);
    glColor3d(0.0, 0.0, 0.0);//色
    glBegin(GL_LINE_LOOP);
    glVertex2d(-0.1f, -0.1f);//位置
    glVertex2d(0.1f, -0.1f);//位置
    glVertex2d(0.1f, 0.1f);//位置
    glVertex2d(-0.1f, 0.1f);//位置

    glEnd();
    glFlush();

}

void keyboard(unsigned char key, int x, int y)
{
    switch (key) {
        case 'q':
        case 'Q':
        case '\033':  /* '\033' は ESC の ASCII コード */
            exit(0);
        default:
            break;
    }
}

void resize(int w, int h)
{

}



void mouse(int btn, int state, int x, int y){
    if(state == GLUT_DOWN){
        mouseX = x;
        mouseY = y;
    }
    else if(btn==GLUT_MIDDLE_BUTTON){
        shiftX += 0.01f*(x - mouseX);
        shiftY -= 0.01f*(y - mouseY);
        display();
    }
}

void init(void)

    {
        glClearColor(1.0, 1.0, 1.0, 0.0);

}

int main(int argc, char *argv[])
{
    glutInitWindowPosition(100, 100);//ウィンドウの位置
    glutInitWindowSize(600, 600);//ウィンドウの幅と大きさ
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA);
    glutCreateWindow(argv[0]);
    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);
//motionfunc
    init();
    glutMainLoop();
    return 0;
}