/* Filename: ShapeLoader.cpp
 *
 * Author: Br. Isidore Minerd
 *
 * Date: July 17, 2009
 *
 * Description:  This program expects a file named "drawing.txt" which follows the format
 *                defined in the included document "fileformat.txt"
 *
 */
#include "DarkGDK.h"
#include <fstream>
#include <math.h>
using namespace std;

#define RECTANGLE_TYPE 1
#define CIRCLE_TYPE 2


// Function Prototypes
void DrawBall(int CenterX, int CenterY, int Radius);
void DrawEmptyBox(int ulx,int uly,int lrx,int lry);

void DarkGDK ( void ) {
   fstream InFile;
   int type,filled,ulx,uly,lrx,lry,cx,cy,r;
   dbSetWindowTitle("A Simple Drawing Loader");
   // Read in the file and draw appropriately
   InFile.open("drawing.txt", ios::in);
   if(InFile.fail()) 
   {
      dbPrint("Could not open file drawing.txt!");
      return;
   } 
   while(! InFile.fail()) 
   {
      InFile >> type;
      switch(type) 
      {
         case RECTANGLE_TYPE:
            InFile >> filled >> ulx >> uly >> lrx >> lry;
            if(filled) 
            {
               dbBox(ulx,uly,lrx,lry);
            } else 
            {
               DrawEmptyBox(ulx,uly,lrx,lry);
            }
         break;
         case CIRCLE_TYPE:
            InFile >> filled >> cx >> cy >> r;
            if(filled) 
            {
               DrawBall(cx,cy,r);
            } else 
            {
               dbCircle(cx,cy,r);
            }
         break;
      }
   }
   dbWaitKey();
}


/* Given:  CenterX      the x-coordinate of the center of the ball.
 *         CenterY      the y-coordinate of the center of the ball.
 *         Radius       the radius of the desired ball.
 * Task:   To draw a filled-in ball with the given center and radius, at least as much of the ball as fits inside of
 *         the bounding rectangle with upper left corner UpperLeftX, UpperLeftY and lower right corner LowerRightX,
 *         LowerRightY.
 * Return: Nothing.
 */
void DrawBall(int CenterX, int CenterY, int Radius)
{
	int RadiusSquared, XDiff, YDiff, UpperLeftX, UpperLeftY, LowerRightX, LowerRightY,rightX,rightY;
   
   // One of several ways to implement this
   UpperLeftX = CenterX - Radius;
   UpperLeftY = CenterY - Radius;
   
	RadiusSquared = Radius * Radius;
   for(int row = UpperLeftY; row <= CenterY; row++) {
      for(int col = UpperLeftX; col <= CenterX; col++) {
         XDiff = CenterX - col;
         YDiff = CenterY - row;
         if ((XDiff * XDiff + YDiff * YDiff) <= RadiusSquared) {
            for(int i=col,max = 2 * CenterX - col; i <= max; i++) {
               dbDot(i,row);
               dbDot(i,2*CenterY - row);
            }
            // We need not go any further to right, so we can break from this for loop
            break; 
         }
      }
   }
}

/*
   Given: ulx  The upper-left corner's x coordinate
          uly  The upper-left corner's y coordinate
          lrx  The lower-right corner's x coordinate
          lry  The lower-right corner's y coordinate
   Task: Draw an empty rectangle, using the coordinates specified 
         Note that this function does not check the validity of the 
           coordinates' values (since we have not studied conditionals yet)
         
   Return: Nothing
*/
void DrawEmptyBox(int ulx,int uly,int lrx, int lry) 
{
   // Draw line from upper left to upper right (NB: urx = lrx and ury = uly)
   dbLine(ulx,uly,lrx,uly);
   // Draw line from upper right to lower right
   dbLine(lrx,uly,lrx,lry);
   // Draw line from lower right to lower left (NB: llx = ulx and lly = lry)
   dbLine(lrx,lry,ulx,lry);
   // Draw line from lower left to upper left
   dbLine(ulx,lry,ulx,uly);
}