/*

	Edge++ Library Demonstration

*/

#include "Edge.h"
int PickingPoints = 0;
EdgeVector Center(0,0,0), Perimeter(0,0,0);


void PlotSafePoint(int x, int y, EdgeColor Color)
{
	if(EdgeIsPointSafe(x, y))
		EdgeDrawPoint(x,  y, Color);
}

/*----------------------------------------------------------------------*/
/* g_offset_circle_points()					  	*/
/*									*/
/* plots a 8 "safe" points which are all reflections of x, y		*/
/* offset from 0,0 by amount specified					*/
/*----------------------------------------------------------------------*/

void g_offset_circle_points(int x, int y, int xoff, int yoff, EdgeColor Color)
{
	PlotSafePoint(x + xoff,  y + yoff, Color);
	PlotSafePoint(y + xoff,  x + yoff, Color);
	PlotSafePoint(x + xoff, -y + yoff, Color);
	PlotSafePoint(y + xoff, -x + yoff, Color);
	PlotSafePoint(-x + xoff,-y + yoff, Color);
	PlotSafePoint(-y + xoff,-x + yoff, Color);
	PlotSafePoint(-x + xoff, y + yoff, Color);
	PlotSafePoint(-y + xoff, x + yoff, Color);
}

/*----------------------------------------------------------------------*/
/* g_draw_circle()							*/
/*									*/
/* draws a circle around given center, using the midpoint circle 	*/
/* algorithm								*/
/*----------------------------------------------------------------------*/

void g_draw_circle(EdgeVector Center, EdgeVector CirclePt, EdgeColor Color)
{
	int x, y, d, deltaE, deltaSE;
	int Radius = (Center  - CirclePt).Size2d();
	x = 0;
	y = Radius;
	d = 1 - Radius;
	deltaE = 3;
	deltaSE = 5 - (Radius * 2);
	g_offset_circle_points(x, y, Center.x, Center.y, Color);
	while(y > x)
	{
		if(d<0)
		{
			d += deltaE;
			deltaE += 2;	
			deltaSE += 2;	
			x++;	
		}
		else
		{
			d += deltaSE;
			deltaE += 2;	
			deltaSE += 4;	
			x++;	
			y--;
		}

		g_offset_circle_points(x, y, Center.x, Center.y, Color);
	}
}

void DrawCircleButton(void)
{
    Center.x = (float)(rand()&640);
    Center.y =(float)(rand()&480);
    Perimeter.x =Center.x + (float)(rand()&128);
    Perimeter.y =Center.y + (float)(rand()&128);
    g_draw_circle(Center, Perimeter, EdgeColor(((float)(rand()&255) / 256.0f), ((float)(rand()&255) / 256.0f), ((float)(rand()&255) / 256.0f)));
}

void ClearAllButton(void)
{
	EdgeClearAll();
}

void WritePPMButton(void)
{
	EdgeWritePPM("example.ppm");
}

void AppExitButton(void)
{
	exit(0);
}

void main()
{
	EdgeAddButton(1, 1, 150, 45, "Draw Circle", DrawCircleButton, GLUT_BITMAP_HELVETICA_18, EdgeColor(1,1,1), EdgeColor(0,1,0));
	EdgeAddButton(152, 1, 150, 45, "Clear All", ClearAllButton, GLUT_BITMAP_HELVETICA_18, EdgeColor(1,1,1), EdgeColor(0,0,1));
	EdgeAddButton(303, 1, 150, 45, "Write PPM", WritePPMButton, GLUT_BITMAP_HELVETICA_18, EdgeColor(1,1,1), EdgeColor(0,0,1));
	EdgeAddButton(454, 1, 150, 45, "Exit", AppExitButton, GLUT_BITMAP_HELVETICA_18, EdgeColor(1,1,1), EdgeColor(0,0.5,1));
	EdgeInit(640, 480, "Testing Edge");
}