demo.fader

/*
 * demo.fader
 *
 * This demo fades between high and low intensities.
 *
 */

#ifndef DEMO_H_
#define DEMO_H_

#define	DEMO

#define	HOLD_FRAMES	0

int	numFrames;

#define PAUSE		20

unsigned int	color;
unsigned int	index;

void setup(void)
{
	// This code is invoked once to initialize the demo...

	numFrames = 0;
	color = 0;
	index = 0;
}

void loop(void)
{
	// This code is invoked once each time the LEDs are scanned...

	unsigned char	new_blue;
	unsigned char	new_green;
	unsigned char	new_red;
	unsigned int	col;
	unsigned int	row;
	unsigned int	x;
	unsigned int	new_intensity;

	if (numFrames > 0)
		{
		// Hold current image for some frames
		numFrames--;
		return;
		}
	numFrames = HOLD_FRAMES;

	if (index == 0)
		{
		// Next color
		color++;
		if (color > 7)
			color = 1;

		index = (FULL_INTENSITY - 1) * 2 + PAUSE * 3;
		}

	if ((index > (FULL_INTENSITY - 1) * 2 + PAUSE * 2) || (index <= PAUSE))
		// Start off and end dim
		new_intensity = 1;
	else if (index > (FULL_INTENSITY - 1) + PAUSE * 2)
		// Fade up
		new_intensity = (FULL_INTENSITY - 1) * 2 + PAUSE * 2 - index + 1;
	else if (index > (FULL_INTENSITY - 1) + PAUSE)
		// Full brightness
		new_intensity = FULL_INTENSITY;
	else
		// Fade down
		new_intensity = index - PAUSE + 1;
	index--;

	if (color & 1)
		new_red = new_intensity;
	else
		new_red = 0;
	if (color & 2)
		new_green = new_intensity;
	else
		new_green = 0;
	if (color & 4)
		new_blue = new_intensity;
	else
		new_blue = 0;
	for (row = 0; row < 8; row++)
		{
		// Set up left band at lowest on intensity
		x = row * 8 * 3;
		if (new_red)
			{
			display_buffer[x] = 1;
			display_buffer[x+3] = 1;
			}
		else
			{
			display_buffer[x] = 0;
			display_buffer[x+3] = 0;
			}
		if (new_green)
			{
			display_buffer[x+1] = 1;
			display_buffer[x+4] = 1;
			}
		else
			{
			display_buffer[x+1] = 0;
			display_buffer[x+4] = 0;
			}
		if (new_blue)
			{
			display_buffer[x+2] = 1;
			display_buffer[x+5] = 1;
			}
		else
			{
			display_buffer[x+2] = 0;
			display_buffer[x+5] = 0;
			}

		// Set up the middle
		for (col = 2; col < 6; col++)
			{
			x = (row * 8 + col) * 3;
			display_buffer[x] = new_red;
			display_buffer[x+1] = new_green;
			display_buffer[x+2] = new_blue;
			}

		// Set up right band at highest on intensity
		x = (row * 8 + 6) * 3;
		if (new_red)
			{
			display_buffer[x] = FULL_INTENSITY;
			display_buffer[x+3] = FULL_INTENSITY;
			}
		else
			{
			display_buffer[x] = 0;
			display_buffer[x+3] = 0;
			}
		if (new_green)
			{
			display_buffer[x+1] = FULL_INTENSITY;
			display_buffer[x+4] = FULL_INTENSITY;
			}
		else
			{
			display_buffer[x+1] = 0;
			display_buffer[x+4] = 0;
			}
		if (new_blue)
			{
			display_buffer[x+2] = FULL_INTENSITY;
			display_buffer[x+5] = FULL_INTENSITY;
			}
		else
			{
			display_buffer[x+2] = 0;
			display_buffer[x+5] = 0;
			}
		}
}

#endif /* DEMO_H_ */