Skip to navigation

BBC Micro Elite

Drawing pixels: CPIX4 (Cassette version)

Name: CPIX4 [View in context] Type: Subroutine Category: Drawing pixels Summary: Draw a double-height dot on the dashboard
Draw a double-height mode 5 dot (2 pixels high, 2 pixels wide). Arguments: X1 The screen pixel x-coordinate of the bottom-left corner of the dot Y1 The screen pixel y-coordinate of the bottom-left corner of the dot COL The colour of the dot as a mode 5 character row byte
.CPIX4 JSR CPIX2 \ Call CPIX2 to draw a single-height dash at (X1, Y1) DEC Y1 \ Decrement Y1 \ Fall through into CPIX2 to draw a second single-height \ dash on the pixel row above the first one, to create a \ double-height dot