☆display_BMP_openGL☆

#include <stdio.h>
#include <stdlib.h>
#include <GLUT/glut.h>


/* keep the picture data*/
#define  IMGFILE  "depth_combine48_cunbus.bmp"
#define  CHANNEL  3  // color(R, G, B)
int i,j;
int width;           // width of picture
int height;          // height of picture
int window1, window2;
/*
float get_wx ;
float get_wy ;
float get_ww ;
float get_wh ;
 */
//float Xshift,Yshift;

GLuint texture;      // texture number
GLubyte* image;      // keep the BMP data

void loadImage(const char* filepath);  // read BMP

float shiftX,shiftY;
float mouseX,mouseY;
float x,y;
float a;
float g_pressed = 0;


void display(void)


{
    /*diaplay the picture */
    glEnable(GL_TEXTURE_2D);
    glClear(GL_COLOR_BUFFER_BIT);
    glBindTexture(GL_TEXTURE_2D, texture);

    glTranslated(-0.5,-0.5,0);

    /*glBegin(GL_QUADS);
     glTexCoord2f(0 , 0); glVertex2f(-0.9 , -0.9);
     glTexCoord2f(0 , 1); glVertex2f(-0.9 , 0.9);
     glTexCoord2f(1 , 1); glVertex2f(0.9 , 0.9);
     glTexCoord2f(1 , 0); glVertex2f(0.9 , -0.9);
     glEnd();
     */
    glBegin(GL_QUADS);
    glTexCoord2f(1.0, 0.0);  glVertex2f(1.0, 0.0);//position
    glTexCoord2f(1.0, 1.0);  glVertex2f(1.0, 1.0);
    glTexCoord2f(0.0, 1.0);  glVertex2f(0.0, 1.0);
    glTexCoord2f(0.0, 0.0);  glVertex2f(0.0, 0.0);

    glDisable(GL_TEXTURE_2D);

    glEnd();


    //glClear(GL_COLOR_BUFFER_BIT);




    //glColor3d(0.0, 0.0, 0.0);//color


    glTranslated(0.5,0.5,0);
    //glTranslatef(shiftX,shiftY,0);

    x=0.1;
    y=0.1;

    glBegin(GL_LINE_LOOP);
   /*
    get_wx=glutGet( GLUT_WINDOW_X );
    get_wx=glutGet( GLUT_WINDOW_Y );
    get_wx=glutGet( GLUT_WINDOW_WIDTH );
    get_wx=glutGet( GLUT_WINDOW_HEIGHT );
    */
    glVertex2d(-x+shiftX, -y+shiftY);//左下
    glVertex2d(x+shiftX, -y+shiftY);//右下
    glVertex2d(x+shiftX, y+shiftY);//右上
    glVertex2d(-x+shiftX, y+shiftY);//カーソルの左上
    printf("ShiftX1 = %f : ShiftY1 = %f\n" , -x+shiftX , -y+shiftY);//左下
    printf("ShiftX2 = %f : ShiftY2 = %f\n" , x+shiftX , -y+shiftY);//
    printf("ShiftX3 = %f : ShiftY3 = %f\n" , x+shiftX , y+shiftY);//
    printf("ShiftX4 = %f : ShiftY4 = %f\n" , -x+shiftX , y+shiftY);//
    //get_wx=glutGet( GLUT_WINDOW_X );
    //get_wy=glutGet( GLUT_WINDOW_Y );
    //get_ww=glutGet( GLUT_WINDOW_WIDTH );
    //get_wh=glutGet( GLUT_WINDOW_HEIGHT );

   // Xshift=x+shiftX;
   // Yshift=y+shiftY;



    //glPushMatrix();
    //glTranslatef(shiftX,shiftY,0);
    // glTranslatef(0.5,0.5,0);
    //glPopMatrix();
    glEnd();


    glutSwapBuffers();



    //glFlush();

}



void myInit(void)
{
    /* necessary setting for before create window*/
    //window1//
    glutInitWindowSize(600, 600);                  // setting for window size
    glutInitWindowPosition(0, 0);              // window position
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);  // setting display mode
    glutCreateWindow("OpenGL");// create window


    glClearColor (0.0, 0.0, 0.0, 1.0);             // window back color

    glutDisplayFunc(display);
    //create texture
    loadImage(IMGFILE);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 8);
    glGenTextures(1, &texture);
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
                 width, height, 0, GL_RGB,
                 GL_UNSIGNED_BYTE, image);



    //gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, WIDTH, TEXHEIGHT,
    //        GL_RGB, GL_UNSIGNED_BYTE, texture);

    free(image);}

void keyboard(unsigned char key, int x, int y)  //keyboard setting
{
    switch (key) {
        case 'q':
        case 'Q':
        case '\033':
            exit(0);
        default:
            break;
    }
}


void mouse(int btn, int state, int x, int y)  //mouze setting
{


    if(btn == GLUT_LEFT_BUTTON == state == GLUT_DOWN)  //when press the left button
    {
        //Xshift=x+shiftX;
       // Yshift=y+shiftY;
        mouseX = x;
        mouseY = y;
        g_pressed = 1;

    }
    else if(btn == GLUT_LEFT_BUTTON == state ==GLUT_UP)  //when take off the left button
        g_pressed = 0;

}


void motion(int x, int y)  //controll the motion by the mouse
{
    {

        shiftX = (float)((x - mouseX)/320);
        shiftY = (float)(-(y - mouseY)/320);
        glutPostRedisplay();

    }

   /* printf("X = %d : Y = %d\n" , x , y);  //diplay the position of coordinate
    printf("ShiftX = %f : ShiftY = %f\n" , shiftX , shiftY);  //display the amount of the shift
    printf("mouseX = %f : mouseY = %f \n" , -x+shiftX , mouseY);
    //printf("mouseX = %f : mouseY = %f \n" , mouseX , mouseY);  //display the mouseX and mouseY
    printf("wx = %f : wy = %f \n" , get_wx , get_wy);
   // printf("windowX = %f : windowY = %f \n" , get_wx , get_wy);
    printf("windowW = %f : windowH = %f \n" , get_ww , get_wh);
    */
}

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


    glutInit(&argc, argv);
    //glutInitDisplayMode(GLUT_RGBA);
    //glutCreateWindow(argv[0]);
    myInit();


    glutDisplayFunc(display);  //when need to set about display function
    glutKeyboardFunc(keyboard);  //when need keyboard function
    glutMouseFunc(mouse);  //when need mouse function
    glutMotionFunc(motion);  //when need mouse motion function
    //glutIdleFunc(idle_func);
    glutMainLoop();

    return 0;
}


void loadImage(const char* filepath)
{
    int i;
    int size;  // size of picture (width , height, color)
    FILE* fp;

    /* read file */
    fp = fopen(filepath, "rb");  //read binary
    if (fp == NULL)
    {
        fprintf(stderr, "%sfail loading\n", filepath);
        exit(EXIT_FAILURE);
    }

    /* get width and height  */
    fseek(fp, 18, SEEK_SET);  //move fp to place where has been put width of picture
    fread(&width, 4, 1, fp);
    fread(&height, 4, 1, fp);

    /* read data of picture */
    fseek(fp, 54, SEEK_SET);  //move fp to place where has been put dataof the picture
    size = width * height * CHANNEL;
    image = (GLubyte* ) malloc(size);
    if (image == NULL)
    {
        fprintf(stderr, "fail to keep the memory\n");
        exit(EXIT_FAILURE);
    }

    for (i = 0; i < size; ++i)
        fread(&image[i], sizeof(GLubyte), 1, fp);

    /* exit */
    fclose(fp);
}

/*範囲選択してからの裏でデータを読む
 float *file1;
 file1= (float *)malloc(画像のwidth*height*sizeof(float));
 if((fpi1=fopen(argv[1],"rb"))==NULL)
 {
 fprintf(stderr,"input file open error\n");
 exit(1);
 }
 fread((float *)file1,sizeof(float),[ウィンドウのwidth]*[ウィンドウのheight],fpi1);
 for(i=[ウィンドウの座標(比）(x/300*width)];i<[ウィンドウのheight];i++)
 {
 for(j=[ウィンドウの座標(比)(y/300*height)];j<[ウィンドウのwidth];j++)
 {
 dn1=file2[(i-iy)*iW+(j-ix)];
 }
 }
 free(file1);
 fclose(fpi1);*/