TCanvas.CopyRect procedure
Copies the rectangle found at
Source in
SrcCanvas to
the destination position in
Dest.
Declaration
procedure CopyRect(const Dest: TRect; SrcCanvas: TCanvas;
const Source: TRect); virtual; reintroduceArguments
Dest | TRect instance with the bounds where the copied values are stored on the canvas. |
SrcCanvas | TCanvas instance with the value copied in the method. |
Source | TRect instance with the content copied in the method. |
Description
CopyRect is a method used to copy a rectangular area from another
TCanvas instance to the specified location on the canvas instance.
No actions are performed in the method if SrcCanvas has not been assigned, or when the width or height in either Source or Dest is zero (0) pixels.
CopyRect calls the StretchBlt routine in the LCL interface to expand or shrink the content in Source to the dimensions in Dest. The CopyMode property provides the raster operation for the block transfer.
CopyRect calls Changing to signal an assigned OnChanging event handler prior to the block transfer. CopyRect calls Changed to signal an assigned OnChange event handler immediately after to the block transfer.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.