Routines
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51373: Test Near To
Used by the routines at TestDoorPassage and NudgeObjectsToArch.
Tests if the player is standing in the place in front of a door, which is a box that is centred on the place that is held in the speeds and the z position of the door, as far as the sizes in HL along x and y and 4 along z.
Input
H Size of the box along y
L Size of the box along x
IX Door record
IY Record of the legs of the player
Output
F Carry flag set if the player is in the box
Test along x.
TestNearTo 51373 LD A,(IX+9) Fetch the x position of the place.
51376 SUB (IY+1) Take away the x position of the player.
51379 JR NC,TestNearTo_Y Jump to TestNearTo_Y if the difference is not negative.
51381 NEG Make it positive.
Test along y.
TestNearTo_Y 51383 CP L Return with the carry flag clear if it is not less than the size of the box along x.
51384 RET NC
51385 LD A,(IX+10) Fetch the y position of the place.
51388 SUB (IY+2) Take away the y position of the player.
51391 JR NC,TestNearTo_Z Jump to TestNearTo_Z if the difference is not negative.
51393 NEG Make it positive.
Test along z.
TestNearTo_Z 51395 CP H Return with the carry flag clear if it is not less than the size of the box along y.
51396 RET NC
51397 LD A,(IX+11) Fetch the z position of the place.
51400 SUB (IY+3) Take away the z position of the player.
51403 JR NC,TestNearTo_Done Jump to TestNearTo_Done if the difference is not negative.
51405 NEG Make it positive.
TestNearTo_Done 51407 CP 4 Compare the difference with 4.
51409 RET Return with the carry flag set if it is less.
View the equivalent code in;
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