84PCSE:BCALLs:4D74

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Synopsis

Hypothesized Official Name: DrawRectBorderClear

BCALL Address: 4D74h

Draw a rectangular outline 1 pixel wide, and fill the interior of the rectangle with white.

Inputs

  • HL = X coordinate of left edge
  • DE = X coordinate of right edge (must be greater than HL and at most 319)
  • B = Y coordinate of top edge (from top of screen)
  • C = Y coordinate of bottom edge (must be greater than B and at most 239)
  • (penFGColor) = RGB color of outline

Outputs

Destroys

  • AF, BC, DE, HL
  • Interrupts disabled

Comments

The rectangle is drawn only to the LCD, never to the graph buffer.

The dimensions of the enclosed area are (HL-DE-1) × (C-B-1). The outer dimensions of the border are (HL-DE+1) × (C-B+1).

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