Loading a heightmap

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impixi
When saving a heightmap to an image file, I tend to use a single colour component (eg blue), providing for only 256 discreet levels, but that’s usually enough for my purposes. I then use bitwise operators when reading in the pixel value. Here’s some sample code (ignore the encoded media stuff):

EDIT: Actually, I think there's a bug in my code... I'll get back to you...

EDIT2: There we go. That's better...

'Move the mouse over the heightmap for coordinate and height value.

SuperStrict

'**** RESTORE ENCODED MEDIA - IGNORE
unencode(True)			
'**** 

Graphics 800, 600
SetBlend SOLIDBLEND

Global Map:Byte[,]
Global PM:TPixmap
Global Width:Int
Global Height:Int

If Not importImageFile("test.png") 
	Notify "Could not load hightmap file."
	End
EndIf
	
Local y:Byte = 0.0	
	
SetColor 255, 255, 255	
	
While Not KeyHit(KEY_ESCAPE)

	Cls
	
	DrawPixmap pm, 0, 0
	
	Local mx:Int = MouseX() 
	Local my:Int = MouseY()
	
	If mx < Width And my < Height
	
		y = Map[mx, my]
		DrawText "(" + mx + ", " + my + ") : " + y, 10, 200
	
	EndIf
		
	Flip True

Wend

End
	
	
Function importImageFile:Int(url:String)

  	pm = LoadPixmap(url)

   	If Not pm Return False      
    	
	If (pm.format <> PF_RGBA8888) Then pm = ConvertPixmap(pm, PF_RGBA8888)

	Width = PixmapWidth(pm)
	Height = PixmapHeight(pm)

	Map = New Byte[Width, Height]
   
   	For Local x:Int = 0 To (Width - 1)
   		For Local z:Int = 0 To (Height - 1)
      		Local c:Int = ReadPixel(pm, x, z)
       		c :| c Shr 24
       		Map[x, z] = $000000 | c
   		Next
   	Next

	Return True

End Function





'*************** ENCODED MEDIA SECTION BELOW - IGNORE ************





Function unencode:TBank(tofile:Int = True)
	
	Local url:String
	Local size:Long
	Local lines:Long
	
	Print "Unencoding..."
	
	RestoreData media
	
	ReadData url
	ReadData size
	ReadData lines
	
	Local bank:TBank = CreateBank(size)
	Local str:String
	Local bpos:Long = 0
	
	For Local n:Long = 1 To lines	
		ReadData str
		For Local i:Int = 0 To (str.length - 1) Step 2
			Local ch:String = "$" + Chr(str[i]) + Chr(str[i + 1])	
			Local val:Byte = Byte(ch)
			PokeByte bank, bpos, val
			bpos :+ 1
		Next
	Next

	If tofile
		Local fho:TStream = OpenFile(url)

		If fho
			CloseFile fho
			If Not Confirm (url + " exists. Replace file?") Then Return bank
		EndIf
	
		If Not SaveBank(bank, url)
			Notify "Could not create output file."
			Return bank
		EndIf
	EndIf

	Print "Done."
	
	Return bank
		
EndFunction

#media
DefData "test.png", 7527, 60
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DefData "050037AB3615B54232014988DCDC44761E57F27EB94181A25A4D8644AABC3CBE8637C3B5A857357BDCA9733ACD43813638384209806B5AA928718E4A8702E0269BB259C068C09DF0C9C542756816ED5AC4AA56B129D598543D328B5CD303776295F6E1FAF90996E14E303A80DD806C85C0A5C9A94A00D268DB128052DDD399"
DefData "C868161E8FC7E17B7EBFBD49540A6B3A1CFA2C02A5EC383B622E0C741D44263468952A76656BDD946ED7C2854BDC5C1E9E075DF3062AC7306107EAA4E3E6A31028DC61254789DB94743D84BA86D27C32B05CCB51A0B147D0B4BB97AB2AEA4C941BD3960E875A878413F02C6425006CB7533C9F048035807ABF959208ECA977"
DefData "133D780150DD278A92A28CBB36F29371691C9275ED6953B1E88480E1BAAA386DC166A04E7D6D18FF8E6163154E3A0DC0BE02BFEF3AA3FAB9651C968FA55667CC80C57F5900BA56312EC9E3A6672A019874FE7408A15B1B27042919A42200850ABA3C80F203D4E57C870310C4A799C9885C1A9ED8AC5CD2C4654EA8FAB979A4"
DefData "E2C3F33DBA53991A3A73B1E7599E9DF3675C174E356799BBAF25B0A6DB7CE514AAC882FD06D62AB14F202E689D725526AE50AFD212581052A75E9596771DBCD30431D770AACB4C3A78D73189DDB0CA947C71FC44D400ECA5AB2C601A0AE190401741C476F1AE256C6D3E7BD089E8884322D4E64F0726B2AD750E96CB2E32FF"
DefData "BF6B03CB1BC5E5672C04CA3E2701724E9CB3F5DCC0CB6515156E801B8EFFDFC34054E91CFE603550DA7057368E85946A01D9F173004AEA16E60A3F5C9AD94DF848DDC954E83B4DBF2AF38A9B871A20BDA71B0EE11CC68E68B20B007704570BC3365BD5E4BDDFEFBDD308B27C76C469ADAFD7777E848BA13B01E846B4AA2255"
DefData "378409BB7771157267FFDD663A753D218B72573165D715C9C4BDEFEA902FAEF93F4C9DFCF764F32C01A68A1D3EF0DFBF490CA14E003A9224ABECC41E4E1338952A56664051B312EDCB09800397A623629219529A686F1193EC2F3A74EAC236A5D85E96B982FC378E45E4C2C83302A0AE8EA73019C1E23645B5B04D1B95C01E"
DefData "8E2E1CE8E4788193A9AB28ECFF00A1C55D21EF6B76C40000000049454E44AE426082"
Let me know if you want me to explain anything in that code.

Incidentally, there’s some stuff in the code archives related to heightmaps: Heightmap Toolbox V0.3.6