Routines
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28382: Draw Gauge Line
Used by the routines at HandlerAccelerate and 28210.
Input
HL Screen location to draw the gauge
A Current Gauge Level
DrawGaugeLine 28382 SRL A C=A / 4.
28384 SRL A
28386 LD C,A
Decrease gauge count by 8 and keep looping around until what's left is < 8 - then handle this part separately.
DrawGaugeLine_Loop 28387 LD A,C A=gauge count - 8.
28388 SUB 8
28390 JR C,DrawGaugeScreen_Last If gauge count < 8 then jump to DrawGaugeScreen_Last.
28392 LD C,A C=gauge count.
28393 LD A,255 A=255 (a full line of pixels to write to the screen).
28395 CALL DrawGaugeScreen Call DrawGaugeScreen.
28398 JR DrawGaugeLine_Loop Jump to DrawGaugeLine_Loop.
Handles drawing the last section of the gauge level.
DrawGaugeScreen_Last 28400 LD B,0 Create an offset in BC (B=0 C=gauge count).
28402 PUSH HL Stash the gauge screen location temporarily.
28403 LD HL,28423 HL=GaugeData + offset.
28406 ADD HL,BC
28407 LD A,(HL) A=gauge data.
28408 POP HL Restore the gauge screen location from the stack.
28409 CALL DrawGaugeScreen Call DrawGaugeScreen.
28412 XOR A A=0 (no pixels - i.e. masking).
Writes A to the screen.
DrawGaugeScreen 28413 PUSH HL Stash the gauge screen location temporarily.
28414 LD B,7 B=7 (counter for number of lines to draw).
DrawGaugeScreen_Loop 28416 LD (HL),A Write A to the screen location held by HL.
28417 INC H Increment H by one to move onto the next row.
28418 DJNZ DrawGaugeScreen_Loop Decrease counter by one and loop back to DrawGaugeScreen_Loop until counter is zero.
28420 POP HL Restore the original gauge screen location from the stack.
28421 INC L Increment L by one to move onto the next column.
28422 RET Return.
Gauge data; each value corresponds to a "full" line for 9 decreasing values. This completes the "end" section when drawing a gauge line.
GaugeData 28423 DEFB 0 udg28423_56x4
28424 DEFB 128
28425 DEFB 192
28426 DEFB 224
28427 DEFB 240
28428 DEFB 248
28429 DEFB 252
28430 DEFB 254
28431 DEFB 255
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