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unit fpg_types;
{$mode objfpc}{$H+}
interface
uses SysUtils, Classes, fpg_base;
function EqualfpgRect(const r1,r2 : TfpgRect) : Boolean;
function PtInfpgRect(const ARect : TfpgRect; const p : TPoint) : Boolean;
function IntersectfpgRect(out ARect : TfpgRect; const R1,R2 : TfpgRect) : Boolean;
function UnionfpgRect(out ARect : TfpgRect; const R1,R2 : TfpgRect) : Boolean;
function IsfpgRectEmpty(const ARect : TfpgRect) : Boolean;
function OffsetfpgRect(var ARect : TfpgRect;DX : Integer;DY : Integer) : Boolean;
function InflatefpgRect(var ARect: TfpgRect; dx: Integer; dy: Integer): Boolean;
function CopyfpgRect(out Ds: TfpgRect;const Sc : TfpgRect): Boolean;
implementation
function EqualfpgRect(const r1,r2 : TfpgRect) : Boolean;
begin
Result:= (r1.Left=r2.Left) and (r1.Right=r2.Right) and (r1.Width=r2.Width) and (r1.Height=r2.Height);
end;
function PtInfpgRect(const ARect : TfpgRect;const p : TPoint) : Boolean;
begin
Result:=(p.y >= ARect.Top) and
(p.y <= ARect.Bottom) and
(p.x >= ARect.Left) and
(p.x <= ARect.Right);
end;
function IsfpgRectEmpty(const ARect : TfpgRect) : Boolean;
begin
Result:=(ARect.Width <= 0) or (ARect.Height <= 0);
end;
function IntersectfpgRect(out ARect : TfpgRect;const R1,R2 : TfpgRect) : Boolean;
begin
ARect:=R1;
with R2 do
begin
if Left > R1.Left then
ARect.Left:=Left;
if Top > R1.Top then
ARect.Top:=Top;
if Right < R1.Right then
ARect.Width:= ARect.Left + Right;
if Bottom < R1.Bottom then
ARect.Height:= ARect.Top + Bottom;
end;
if IsfpgRectEmpty(ARect) then
begin
FillChar(ARect,SizeOf(ARect),0);
Result:=false;
end
else
Result:=true;
end;
function UnionfpgRect(out ARect : TfpgRect;const R1,R2 : TfpgRect) : Boolean;
begin
ARect:=R1;
with R2 do
begin
if Left < R1.Left then
ARect.Left:=Left;
if Top < R1.Top then
ARect.Top:=Top;
if Right > R1.Right then
ARect.Width:= ARect.Left + Right;
if Bottom>R1.Bottom then
ARect.Height:= ARect.Top + Bottom;
end;
if IsfpgRectEmpty(ARect) then
begin
FillChar(ARect,SizeOf(ARect),0);
Result:=false;
end
else
Result:=true;
end;
function OffsetfpgRect(var ARect : TfpgRect;DX : Integer;DY : Integer) : Boolean;
begin
if assigned(@ARect) then
begin
with ARect do
begin
inc(Left,dx);
inc(Top,dy);
end;
Result:=true;
end
else
Result:=false;
end;
function InflatefpgRect(var ARect: TfpgRect; dx: Integer; dy: Integer): Boolean;
begin
if Assigned(@ARect) then
begin
with ARect do
begin
dec(Left, dx);
dec(Top, dy);
inc(Width, dx*2);
inc(Height, dy*2);
end;
Result := True;
end
else
Result := False;
end;
function CopyfpgRect(out Ds: TfpgRect;const Sc : TfpgRect): Boolean;
begin
Ds:=Sc;
if IsfpgRectEmpty(Ds) then
begin
FillChar(Ds,SizeOf(Ds),0);
Result:=false;
end
else
Result:=true;
end;
end.
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