// rotef with class
//  various rotation examples of charactor 'F'
//  the examples of composite transformation
//  In multiplication of transformation matrices the order of multiplication is important.
// T. Kosaka CS TNCT 2Aug2002

#include <stdio.h>
#include <math.h>
#include <GL/glut.h>
#include "CGCore2D.h"

void userdraw(void);

void display(void)
{
    glClear( GL_COLOR_BUFFER_BIT);
    userdraw();
    glutSwapBuffers();
}

//////////////////////////////////////////////////////////////////
void drawcharX(float x,float y) //文字 x の表示
{
    C_Color white(1.,1.,1.);
    C_Line charX1(x,y,x+10,y+12,white); charX1.draw();
    C_Line charX2(x,y+12,x+10,y,white); charX2.draw();
}

void drawcharY(float x,float y) //文字 y の表示
{
    C_Color white(1.,1.,1.);
    C_Line charY1(x+5,y,x+5,y+7,white); charY1.draw();
    C_Line charY2(x,y+12,x+5,y+7,white); charY2.draw();
    C_Line charY3(x+10,y+12,x+5,y+7,white); charY3.draw();
}

void drawAxes(void) // xy軸の表示
{
    C_Color white(1.,1.,1.);
    C_Line charAX1(-310,0,310,0,white); charAX1.draw();
    C_Line charAX2(310,0,300,5,white); charAX2.draw();
    C_Line charAX3(310,0,300,-5,white); charAX3.draw();
    drawcharX(300,-20);
    C_Line charAY1(0,-230,0,230,white); charAY1.draw();
    C_Line charAY2(0,230,5,220,white); charAY2.draw();
    C_Line charAY3(0,230,-5,220,white); charAY3.draw();
    drawcharY(-20,220);
}

//////////////////////////////////////////////////////////////////

void userdraw(void)
{
    static int tick=0;
    int disp=(tick/300)%6;
    int tickindisp=tick%300;
    C_Point ef00[10];
    ef00[0].x= 10, ef00[0].y=100;
    ef00[1].x= 10, ef00[1].y= 10;
    ef00[2].x= 30, ef00[2].y= 10;
    ef00[3].x= 30, ef00[3].y= 40;
    ef00[4].x= 60, ef00[4].y= 40;
    ef00[5].x= 60, ef00[5].y= 60;
    ef00[6].x= 30, ef00[6].y= 60;
    ef00[7].x= 30, ef00[7].y= 80;
    ef00[8].x= 70, ef00[8].y= 80;
    ef00[9].x= 70, ef00[9].y=100;

    C_Color cyan(0.,1.,1.);
    C_Polygon ef0(ef00,10,cyan);
    C_Polygon ef;
    C_Matrix mat,trans1,rot1,trans2,rot2,scale;
    float factor;
    drawAxes();
    ef0.draw();
    trans1.setTranslation(-40,-50);
    trans2.setTranslation(160,0);
    rot1.setRotation(tickindisp*0.02);
    rot2.setRotation(tickindisp*0.02);
    switch(disp) {
    case 0: //translation -> rotation
        glutSetWindowTitle("composition - translation -> rotation");
        mat=rot1*trans1;
        break;
    case 1: //translation -> rotation -> translation
        glutSetWindowTitle("composition - translation -> rotation -> translation");
        mat=trans2*rot1*trans1;
        break;
    case 2: //translation -> rotation
        glutSetWindowTitle("composition - translation -> rotation");
        mat=rot1*trans1;
        break;
    case 3: //translation -> rotation  -> translation -> rotation
        glutSetWindowTitle("composition - translation -> rotation  -> translation -> rotation");
        mat=rot2*trans2*rot1*trans1;
        break;
    case 4: //translation -> rotation  -> translation -> rotation
        glutSetWindowTitle("composition - translation -> rotation  -> translation -> rotation");
        rot1.setRotation(-tickindisp*0.02);
        mat=rot2*trans2*rot1*trans1;
        break;
    case 5: //trans -> scaling -> rot -> trans -> rot
        glutSetWindowTitle("composition - trans -> scaling -> rot -> trans -> rot");
        factor=0.3+0.35*(sin(tickindisp*0.1)+1);
        scale.setScale(factor,factor);
        rot1.setRotation(-tickindisp*0.02);
        mat=rot2*trans2*rot1*scale*trans1;
        break;
    default:
        break;
    }
    ef=mat*ef0;
    ef.draw();
    tick++;
}

int main(int argc, char **argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode ( GLUT_DOUBLE | GLUT_RGB );
    glutInitWindowPosition(100,100);
    glutInitWindowSize(640,480);
    glutCreateWindow ("composition");
    glClearColor(0.0, 0.0, 0.0, 0.0);
    gluOrtho2D(-320., 320., -240.0, 240.0);
      // Define the dimensions of the Orthographic Viewing Volume
    glutIdleFunc(display); // idle event call back
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;
}