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Autodocs
 Libraries:
 layers.library
  BeginUpdate
  BehindLayer
  CreateBehindHookLayer
  CreateBehindLayer
  CreateUpfrontHookLayer
  CreateUpfrontLayer
  DeleteLayer
  DisposeLayerInfo
  DoHookClipRects
  EndUpdate
  FattenLayerInfo
  InitLayers
  InstallClipRegion
  InstallLayerHook
  InstallLayerInfoHook
  LockLayer
  LockLayerInfo
  LockLayers
  MoveLayer
  MoveLayerInFrontOf
  MoveSizeLayer
  NewLayerInfo
  ScrollLayer
  SizeLayer
  SwapBitsRastPortClipRect
  ThinLayerInfo
  UnlockLayer
  UnlockLayerInfo
  UnlockLayers
  UpfrontLayer
  WhichLayer
Include
GuruMeditation
Docs » Autodocs » layers.library » ScrollLayer

NAME

	ScrollLayer -- Scroll around in a superbitmap, translate coordinates
                      in non-superbitmap layer.

SYNOPSIS

	ScrollLayer( dummy, l, dx, dy )
	             a0     a1 d0  d1
	void ScrollLayer( LONG, struct Layer *, LONG, LONG);

FUNCTION

	For a SuperBitMap Layer:
	Update the SuperBitMap from the layer display, then copy bits
	between Layer and SuperBitMap to reposition layer over different
	portion of SuperBitMap.
	For nonSuperBitMap layers, all (x,y) pairs are adjusted by
	the scroll(x,y) value in the layer.  To cause (0,0) to actually
	be drawn at (3,10) use ScrollLayer(-3,-10). This can be useful
	along with InstallClipRegion to simulate Intuition GZZWindows
	without the overhead of an extra layer.

INPUTS

	dummy - unused
	l - pointer to a layer
	dx - delta to add to current x scroll value
	dy - delta to add to current y scroll value

BUGS

	May not handle (dx,dy) which attempts to move the layer outside the
	layer's SuperBitMap bounds.

SEE ALSO

<graphics/layers.h>

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