84PCSE:BCALLs:47CB

Synopsis

Hypothesized Official Name: ILine

BCALL Address: 47CBh

Draw a line.

Inputs

• DE = starting pixel X coordinate
• C = starting pixel Y coordinate (from bottom of screen)
• HL = ending pixel X coordinate
• B = ending pixel Y coordinate
• A = operation to perform on line (see below)
• (penFGColor) = RGB color to draw to LCD
• (penFGColorIndex) = Color index to store in graph buffer
• fullScrnDraw, (iy + apiFlg4) = 1 to use LCD coordinates; 0 to use graph coordinates
• plotLoc, (iy + plotFlags) = 1 to draw to LCD only; 0 to draw to LCD and graph buffer
• g_style_active, (iy + sGrFlags) = 1 to draw "fancy" dots for graphing

Outputs

• (9851h) = input C
• (9852h) = input DE

Destroys

• Drawing hook is called
• IX
• (A59Eh), (A5BAh), (A5BCh), (A5F6h), (A5F8h), (A5FAh), (A5FCh)

Comments

As for IPoint:

• A = 0 will draw a white or transparent line
• A = 1 will draw a line using the current foreground color
• A = 2 will "invert" pixels along the line
• A = 4 will restore pixels from the graph buffer

See IPoint for more details.