var
pt: array[0..3] of TPoint;
begin
pt[0] := Point(10, 10);
pt[1] := Point(80, 10);
pt[2] := Point(160, 70);
pt[3] := Point(10, 70);
// 画折线
Image1.Canvas.Brush.Color := clInfoBk;
Image1.Canvas.FillRect(Image1.ClientRect);
Image1.Canvas.Pen.Color := clBlue;
Image1.Canvas.Pen.Width := 2;
Image1.Canvas.Polyline(pt);
// 画箭头
Image1.Canvas.MoveTo(80, 100);
Image1.Canvas.LineTo(200, 100);
Image1.Canvas.LineTo(180, 90);
Image1.Canvas.MoveTo(180, 110);
Image1.Canvas.LineTo(200, 100);