//*******************************************************************************
//* e(x,y) = b^2*x^2 + a^2*y^2 - a^2*b^2
//* a = xRadius
//* b = yRadius
//*******************************************************************************
void dispFillEllipse(int xCenter, int yCenter, int xRadius, int yRadius)
{
int xx = 0;
int yy = yRadius;
unsigned int width = 1;
long a2 = (long)xRadius * xRadius;
long b2 = (long)yRadius * yRadius;
long crit1 = -(a2 / 4 + xRadius % 2 + b2);
long crit2 = -(b2 / 4 + yRadius % 2 + a2);
long crit3 = -(b2/4 + yRadius % 2);
long t = -a2 * yy; /* e(x+1/2,y-1/2) - (a^2+b^2)/4 */
long dxt = 2 * b2 * xx;
long dyt = -2 * a2 * yy;
long d2xt = 2 * b2;
long d2yt = 2 * a2;
while (yy >= 0 && xx <= xRadius)
{
if (t + b2 * xx <= crit1 || /* e(x+1,y-1/2) <= 0 */
t + a2 * yy <= crit3)
{
/* e(x+1/2,y) <= 0 */
incx();
width += 2;
}
else if (t - a2 * yy > crit2)
{
/* e(x+1/2,y-1) > 0 */
//dispRectangle(xCenter - x, yCenter - y, width, 1);
dispRectangle(xCenter - xx, yCenter - yy, width, 1);
if (yy != 0)
{
//dispRectangle(xCenter- xx, yCenter + y, width, 1);
dispRectangle(xCenter - xx, yCenter + yy, width, 1);
}
incy();
}
else
{
//dispRectangle(xCenter - xx, yCenter - y, width, 1);
dispRectangle(xCenter - xx, yCenter - yy, width, 1);
if (yy != 0)
{
//dispRectangle(xCenter - xx, yCenter + y, width, 1);
dispRectangle(xCenter - xx, yCenter + yy, width, 1);
}
incx();
incy();
width += 2;
}
}
if (yRadius == 0)
{
//dispRectangle(xCenter - xRadius, yCenter, 2 * xRadius + 1, 1);
dispRectangle(xCenter - xRadius, yCenter, 2 * xRadius + 1, 1);
}
}
//*******************************************************************************
//* returns TRUE if image was drawn
char bmp_draw_imageN(int imageIndex, int xLoc, int yLoc)
{
unsigned long bmp_loc;
unsigned char bmp_buff[DATAFLASH_PAGESIZE];
int bmpWidth;
int bmpHeight;
long length;
int byteCnt;
int pixelX, pixelY;
long longByte1, longByte2, longByte3, longByte4;
FLASH_FILE_ENTRY myFileEntry;
char imageOK;
imageOK = FALSE;
cli(); //disable interrupts
GetFlashFileEntry(imageIndex, &myFileEntry);
if (myFileEntry.fileName[0] >= 0x20)
{
//* OK, it looks like a valid file
imageOK = TRUE;
#ifdef _USE_7LETTER_NAMES_
longByte1 = (myFileEntry.flashOffsetByte1 & 0x0ff);
longByte2 = (myFileEntry.flashOffsetByte2 & 0x0ff);
longByte3 = (myFileEntry.flashOffsetByte3 & 0x0ff);
longByte4 = (myFileEntry.flashOffsetByte4 & 0x0ff);
bmp_loc = longByte1 << 24;
bmp_loc |= longByte2 << 16;
bmp_loc |= longByte3 << 8;
bmp_loc |= longByte4;
#else
bmp_loc = myFileEntry.flashOffset;
#endif
/* Get the width and height */
dataflash_read_block(bmp_buff, bmp_loc, 2);
longByte1 = bmp_buff[0];
longByte2 = bmp_buff[1];
// longByte3 = bmp_buff[2];
// longByte4 = bmp_buff[3];
bmpWidth = longByte1 & 0x0ff;
bmpHeight = longByte2 & 0x0ff;
length = (uint32_t)bmpWidth * (uint32_t)bmpHeight;
//* Incremement the bmp pointer passed the width/height
bmp_loc += 2;
dataflash_read_block(bmp_buff, bmp_loc, DATAFLASH_PAGESIZE);
byteCnt = 0;
if ((xLoc == -1) && (yLoc == -1))
{
//* if xLoc and yLoc are -1, then CENTER the image
xLoc = (gWidth - bmpWidth) / 2;
yLoc = (gHeight - bmpHeight) / 2;
if (xLoc < 0)
{
xLoc = 0;
}
if (yLoc < 0)
{
yLoc = 0;
}
GraphicsColor.red = 0;
GraphicsColor.blue = 0;
GraphicsColor.green = 0;
dispRectangle(0, 0, gWidth-1, gHeight-1);
}
pixelX = 0;
pixelY = 0;
while ((pixelY < bmpHeight) && (length > 0))
{
GraphicsColor.red = bmp_buff[byteCnt++];
GraphicsColor.blue = bmp_buff[byteCnt++];
GraphicsColor.green = bmp_buff[byteCnt++];
dispPixel(xLoc + pixelX, yLoc + pixelY);
pixelX++;
if (pixelX >= bmpWidth)
{
pixelX = 0;
pixelY++;
}
if (byteCnt >= DATAFLASH_PAGESIZE)
{
bmp_loc += DATAFLASH_PAGESIZE;
dataflash_read_block(bmp_buff, bmp_loc, DATAFLASH_PAGESIZE);
byteCnt = 0;
}
length--;
}
}
sei(); //enable interrupts
return(imageOK);
}
