//
// Jeff West
// CSE143, Summer 2001
// Quiz Section 16
// Circular Weirdness
//

#include "gp142display.h"
#include "gp142.h"
#include <cstdlib> // Must include this to use the rand() and srand() 
functions!!!
#include <ctime>   // Must include this to use the time() function to seed 
the random number generator!!!
#include <cmath>   // Includes PI constant; cos, sin functions



//  For many of the GP142 functions, a line width of
//  zero means to fill the shape being drawn.  The
//  constant FillWidth is used in function calls when a solid
//  shape is desired.
const int FillWidth  = 0;

//  The circle radius -- used in deciding where circle dots can be
//  placed
const double RADIUS = 150.0;

const double PI = 3.14159;



double randTheta() {
	// get a random theta -- 2 * PI by 1000.0 then divide the result
	// by 1000.0 to assist us in getting a theta with three decimal
	// places of accuracy
	return (rand() % (int)(2 * PI * 1000.0)) / 1000.0;
}



void drawRandomCircleDot(GP142Display& display) {
	// get a random color for the pixel
	GP142Color color = (GP142Color)(rand() % 24);

	// get a random theta between 0 and 2 * PI
	double theta = randTheta();

	int x = (int)(RADIUS * cos(theta));
	int y = (int)(RADIUS * sin(theta));

	display.drawPixel(x, y, color);
}



//****************************************************************************
//
//     MAIN
//
//****************************************************************************


// * Main program contents:
// *   - Major program variables that persist throughout execution
// *   - Event loop that processes GP142 events,
// *     and updates variables and redraws the window as needed.  until the 
user quits
//
int main() {
	srand( (unsigned)time( NULL ) );

	// Event handling and menu items:
	bool quit = false;		// = "user has selected quit"
	char key_pressed;		// last keyboard character from key event
	int  mouse_x, mouse_y;	// x and y coordinates of latest mouse event

	GP142Display display;		// our GP142 window

	display.clear (White);
	display.setAnimation (Run);

	// * Main event loop:
	// * ---- ----- -----
	// * Wait for the next user action, decode it, and call an
	// * appropriate function to handle it.  Repeat until the
	// * user selects quit.
	//
	while (!quit) {
		display.getNextEvent(mouse_x, mouse_y, key_pressed);

		// The code for redrawing the screen goes here...
		drawRandomCircleDot(display);
	}

	return 0;
}