/*
* NAME: WriteCharDisplayBuf
* DESCRIPTION: Writes one character to the display screen buffer (DisplayUpdate() needs to be called subsequently to output the buffer to the screen)
* INPUTS:
*
* Character: The character we want to draw. In this sample, special characters like tabs and newlines are not supported.
* Col: The horizontal column we want to start drawing at. This is equivalent to the 'X' axis pixel position.
* Row: The vertical row we want to write to. The screen is divided up into 4 rows of 16 pixels each, so valid values for Row are 0,1,2,3.
*
* RETURN VALUE:
* We return the number of horizontal pixels used. This value is 0 if Row/Col are out-of-bounds, or if the character isn't available in the font.
*/
public UInt32 WriteCharDisplayBuf(Char Chr, UInt32 Col, UInt32 Row)
{
/* Check that we were able to find the font corresponding to our character */
FontCharacterDescriptor CharDescriptor = DisplayFontTable.GetCharacterDescriptor(Chr);
if (CharDescriptor == null)
{
return(0);
}
/* Make sure we're drawing within the boundaries of the screen buffer */
UInt32 MaxRowValue = (SCREEN_HEIGHT_PAGES / DisplayFontTable.FontHeightBytes) - 1;
UInt32 MaxColValue = SCREEN_WIDTH_PX;
if (Row > MaxRowValue)
{
return(0);
}
if ((Col + CharDescriptor.CharacterWidthPx + DisplayFontTable.FontCharSpacing) > MaxColValue)
{
return(0);
}
UInt32 CharDataIndex = 0;
UInt32 StartPage = Row * 2; //0
UInt32 EndPage = StartPage + CharDescriptor.CharacterHeightBytes; //2
UInt32 StartCol = Col;
UInt32 EndCol = StartCol + CharDescriptor.CharacterWidthPx;
UInt32 CurrentPage = 0;
UInt32 CurrentCol = 0;
/* Copy the character image into the display buffer */
for (CurrentPage = StartPage; CurrentPage < EndPage; CurrentPage++)
{
for (CurrentCol = StartCol; CurrentCol < EndCol; CurrentCol++)
{
byte [] Page = DisplayBuffer[(int)CurrentCol];
// byte Pixel = CharDescriptor.CharacterData[CharDataIndex];
Page[CurrentPage] = CharDescriptor.CharacterData[CharDataIndex];
// DisplayBuffer[CurrentCol, CurrentPage] = CharDescriptor.CharacterData[CharDataIndex];
CharDataIndex++;
}
}
/* Pad blank spaces to the right of the character so there exists space between adjacent characters */
for (CurrentPage = StartPage; CurrentPage < EndPage; CurrentPage++)
{
for (; CurrentCol < EndCol + DisplayFontTable.FontCharSpacing; CurrentCol++)
{
byte[] Page = DisplayBuffer[(int)CurrentCol];
// byte Pixel = CharDescriptor.CharacterData[CharDataIndex];
Page[CurrentPage] = 0x00;
// DisplayBuffer[CurrentCol, CurrentPage] = 0x00;
}
}
/* Return the number of horizontal pixels used by the character */
return(CurrentCol - StartCol);
}
/*
* NAME: WriteCharDisplayBuf
* DESCRIPTION: Writes one character to the display screen buffer (DisplayUpdate() needs to be called subsequently to output the buffer to the screen)
* INPUTS:
*
* Character: The character we want to draw. In this sample, special characters like tabs and newlines are not supported.
* Col: The horizontal column we want to start drawing at. This is equivalent to the 'X' axis pixel position.
* Row: The vertical row we want to write to. The screen is divided up into 4 rows of 16 pixels each, so valid values for Row are 0,1,2,3.
*
* RETURN VALUE:
* We return the number of horizontal pixels used. This value is 0 if Row/Col are out-of-bounds, or if the character isn't available in the font.
*/
public uint WriteCharDisplayBuf(char Chr, uint Col, uint Row)
{
/* Get our character descriptor or the undefined box */
FontCharacterDescriptor CharDescriptor = DisplayFontTable.GetCharacterDescriptor(Chr);
/* Make sure we're drawing within the boundaries of the screen buffer */
uint MaxRowValue = (SCREEN_HEIGHT_PAGES / DisplayFontTable.FontHeightBytes) - 1;
uint MaxColValue = SCREEN_WIDTH_PX;
if (Row > MaxRowValue)
{
return(0);
}
if ((Col + CharDescriptor.CharacterWidthPx + DisplayFontTable.FontCharSpacing) > MaxColValue)
{
return(0);
}
uint CharDataIndex = 0;
uint StartPage = Row * 2; //0
uint EndPage = StartPage + CharDescriptor.CharacterHeightBytes; //2
uint StartCol = Col;
uint EndCol = StartCol + CharDescriptor.CharacterWidthPx;
uint CurrentPage = 0;
uint CurrentCol = 0;
/* Copy the character image into the display buffer */
for (CurrentPage = StartPage; CurrentPage < EndPage; CurrentPage++)
{
for (CurrentCol = StartCol; CurrentCol < EndCol; CurrentCol++)
{
DisplayBuffer[CurrentCol, CurrentPage] = CharDescriptor.CharacterData[CharDataIndex];
CharDataIndex++;
}
}
/* Pad blank spaces to the right of the character so there exists space between adjacent characters */
for (CurrentPage = StartPage; CurrentPage < EndPage; CurrentPage++)
{
for (; CurrentCol < EndCol + DisplayFontTable.FontCharSpacing; CurrentCol++)
{
DisplayBuffer[CurrentCol, CurrentPage] = 0x00;
}
}
/* Return the number of horizontal pixels used by the character */
return(CurrentCol - StartCol);
}
public void DrawText(uint x, uint y, string Line, uint color)
{
foreach (Char Character in Line)
{
FontCharacterDescriptor CharDescriptor = DisplayFontTable.GetCharacterDescriptor(Character);
if (CharDescriptor == null)
{
return;
}
uint w = CharDescriptor.CharacterWidthPx;
w = 16;
uint h = CharDescriptor.CharacterHeightBytes;
addressSet(x, y, x + w, y + h);
DisplaySendData(CharDescriptor.CharacterData);
x += w;
}
}