Нарисовать линию, не используя функции LineTo

Советы » Canvas » Нарисовать линию, не используя функции LineTo

{ 
  Enables you do draw a line if for some reason you 
  cannot use the delphi LineTo procedure. 
  For example, for drawing higher resolution lines 
  or drawing lines in 2D arrays. 
}

 procedure

DrawLine(APoint1, APoint2: TPoint; ACanvas: TCanvas); var

Lpixel, LMaxAxisLength: integer; LRatio: Real; begin

LMaxAxisLength := Max(abs(APoint1.X - APoint2.X), abs(APoint1.Y - APoint2.Y)); for

Lpixel := 0 to

LMaxAxisLength do

begin

LRatio := Lpixel / LMaxAxisLength; ACanvas.Pixels[APoint1.X + Round((APoint2.X - APoint1.X) * LRatio), APoint1.Y + Round((APoint2.Y - APoint1.Y) * LRatio)] := ACanvas.Pen.Color; end

; end

; // Draw a double resolution line procedure

DrawLineDouble(APoint1, APoint2: TPoint; ACanvas: TCanvas); var

Lpixel, LMaxAxisLength: integer; LRatio: Real; LPoint: TPoint; begin

LMaxAxisLength := max(abs(APoint1.X - APoint2.X), abs(APoint1.Y - APoint2.Y)); for

Lpixel := 0 to

LMaxAxisLength do

begin

LRatio := Lpixel / LMaxAxisLength; LPoint.X := APoint1.X + Round((APoint2.X - APoint1.X) * LRatio); LPoint.Y := APoint1.Y + Round((APoint2.Y - APoint1.Y) * LRatio); with

ACAnvas do

begin

Pixels[LPoint.X * 2, LPoint.Y * 2] := clBlack; Pixels[(LPoint.X * 2) + 1, LPoint.Y * 2] := clBlack; Pixels[LPoint.X * 2, (LPoint.Y * 2) + 1] := clBlack; Pixels[(LPoint.X * 2) + 1, (LPoint.Y * 2) + 1] := clBlack; end

; end

; end

;

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