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ubuntu的lazarus的Tline/TeaLine组件的构思

news 2026/4/15 1:53:39

ubuntu的lazarus的Tline/TeaLine组件的构思

近来，想到，lazarus没有一个TLine组件，于是自写一个，不太満意，暂时烦，晕，疲，咳，不想理，写代码途中，总是遇到各种不顺的事，尽量不写。。。
创建一个TeaLine组件，总是刷新不理想：
想得容易，构思似乎很好，实际上，做过才知，这个TLine/TeaLine，一开始，刷新不易，后来，可以实现，鼠标一移动，就令窗体或ScrollBox出现滚动条ScrollBar，新的问题又来了：鼠标移动时，当前触发mouseMove事件的组件，覆盖了下面的组件，事件如何传递到被覆盖的底层？用parent的componentCount来循环，又产生更新的问题，不同的Tealine有不同的showHint和不同的hint，如何处理呢？？？

1)若oneline.paint再application. processmessage再oneline.paint,则自动产生scrollBar,若TeaLine组件内onPaint代码去掉self. refresh亦自力产生滚动条.讲明...
这种事系统级常非下级可控制
2)TeaLine互相覆盖, MouseMove可判断,然后bringToFront再自然hint
3)hintWindow或可自定义
4)要通过getparent或
getparentForm,再componetCount,这个有没更好算法
一，TeaLine，底线也
二，FastLine，最快路径，中线也
三，SeaLine，此TSP，上线也
四，四色定理染色算法，
五，角谷者，五谷也，属性为五乎

unit TLine;

{$mode objfpc}{$H+}
//{$I typshrdh.inc}
//{$I winapih.inc}
interface

uses
Classes, SysUtils, Forms, Controls, Graphics, Dialogs, LCLType,
LMessages, StdCtrls, GraphMath, Math;

type
//TSize = record
// cx: longint;
// cy: longint;
//end;
{ TeaLine }// Canvas.Line(x1,y1,x2,y2); //TScrollingWinControl(parent).Canvas.Line(x1,y1,x2,y2);
TeaLine = class(TGraphicControl)
// TeaLine = class(TeaLine)
//TeaLine = class(TGraphicControl)
// TeaLine = class(TCanvas)
//TeaLine = class(Tshape)
// TeaLine = class(TwinControl)
// TeaLine = class(TCustomControl)

private
FFocusControl: TWinControl;
FShowAccelChar: boolean;
FInternalSetBounds: boolean;
protected
class procedure WSRegisterClass; override;
procedure DoDrawText(var Rect: TRect; Flags: longint); virtual;
procedure WMActivate(var Message: TLMActivate); message LM_ACTIVATE;
procedure Notification(AComponent: TComponent; Operation: TOperation); override;
function GetLabelText: string; virtual;
function GetTransparent: boolean;
procedure SetFocusControl(Value: TWinControl);
procedure SetTransparent(NewTransparent: boolean);
property FocusControl: TWinControl read FFocusControl write SetFocusControl;
property Transparent: boolean read GetTransparent write SetTransparent default True;
public
x1, y1, x2, y2, parentCursorX, parentCursorY: integer;
arrow: boolean;
wwwhint:string;
procedure TTLiLineMouseMove(Sender: TObject; Shift: TShiftState; X, Y: integer);
function GetClientRect: TRect; override;
function DrawArrow(ccanvas: Tcanvas; bpoint, epoint: tpoint): integer;
constructor Create(TheOwner: TComponent); override;
procedure Paint; override;
property Color;
end;

implementation

{ TeaLine }
function SH_abc(A, B, C: TPoint): double;
var
aa, bb, cc, s: double;
begin
// 计算三边长度
aa := Sqrt(Sqr(B.X - C.X) + Sqr(B.Y - C.Y)); // BC边长度
bb := Sqrt(Sqr(A.X - C.X) + Sqr(A.Y - C.Y)); // AC边长度
cc := Sqrt(Sqr(A.X - B.X) + Sqr(A.Y - B.Y)); // AB边长度

// 计算半周长
s := (aa + bb + cc) / 2;

// 应用海伦公式计算面积
Result := Sqrt(s * (s - aa) * (s - bb) * (s - cc));
Result := Result / aa;
end;

function PointInRect(Point: TPoint; Rect: TRect): boolean;
begin
Result := (Point.X >= Rect.Left) and (Point.X <= Rect.Right) and
(Point.Y >= Rect.Top) and (Point.Y <= Rect.Bottom);
end;

function TeaLine.DrawArrow(ccanvas: Tcanvas; bpoint, epoint: tpoint): integer;
var
arrowSize, arrowSizeHead: integer;
angle: double;
arrowP1, arrowP2, arrowHead: TPoint;
lineAngle, distlength: double;
dx, dy: integer;
Points: array[0..3] of TPoint; // 创建一个包含4个点的数组
cc: Tcolor;
begin
arrowSize := 20;//10; // 箭头大小
arrowSizeHead := 10; //箭头簇大小
dx := epoint.X - bpoint.X;
dy := epoint.Y - bpoint.Y;

// 计算线段角度
if dx = 0 then
begin
if dy > 0 then lineAngle := Pi / 2
else
lineAngle := -Pi / 2;
end
else
begin
lineAngle := ArcTan2(dy, dx);
end;

// 计算箭头两个点的位置
arrowP1.X := epoint.X - Round(arrowSize * Cos(lineAngle + Pi / 6));
arrowP1.Y := epoint.Y - Round(arrowSize * Sin(lineAngle + Pi / 6));

arrowP2.X := epoint.X - Round(arrowSize * Cos(lineAngle - Pi / 6));
arrowP2.Y := epoint.Y - Round(arrowSize * Sin(lineAngle - Pi / 6));

distlength := sqrt((epoint.X - bpoint.X) * (epoint.X - bpoint.X) +
(epoint.Y - bpoint.Y) * (epoint.Y - bpoint.Y));
arrowHead.x := epoint.X - Round((arrowSizeHead / distlength) * (epoint.X - bpoint.X));
arrowHead.y := epoint.y - Round((arrowSizeHead / distlength) * (epoint.y - bpoint.y));

//TScrollingWinControl(self.Parent).Canvas.pen.Width := 2;
ccanvas.pen.Width := 2;
// 绘制箭头线
//TScrollingWinControl(self.Parent).Canvas.Line(bpoint, epoint); // 主线段
ccanvas.Line(bpoint, epoint); // 主线段
Points[0] := epoint;
Points[1] := arrowP1;
Points[2] := arrowHead;
Points[3] := arrowP2;
// TScrollingWinControl(self.Parent).Canvas.Brush.Color :=
// TScrollingWinControl(self.Parent).Canvas.pen.Color;
cCanvas.Brush.Color := cCanvas.pen.Color;
// 设置为填充
// TScrollingWinControl(self.Parent).Canvas.Polygon(Points);
cCanvas.Polygon(Points);
//cc:=self.ScrollBox1.Canvas.pen.Color;
//self.ScrollBox1.Canvas.pen.Color:=clblack;
//TScrollingWinControl(self.Parent).Canvas.Line(epoint, arrowP1); // 箭头线1
//TScrollingWinControl(self.Parent).Canvas.Line(epoint, arrowP2); // 箭头线2
cCanvas.Line(epoint, arrowP1); // 箭头线1
cCanvas.Line(epoint, arrowP2); // 箭头线2
//self.ScrollBox1.Canvas.pen.Color:=cc;
Result := 1;
end;

function TeaLine.GetClientRect: TRect;
begin
Result.Left := min(x1, x2);
Result.top := min(y1, y2);
Result.Right := max(x1, x2);
Result.Bottom := max(y1, y2);
end;

procedure TeaLine.DoDrawText(var Rect: TRect; Flags: longint);
var
LabelText: string;
OldFontColor: TColor;
Rect2: TRect;
begin

end;

procedure TeaLine.Notification(AComponent: TComponent; Operation: TOperation);
begin
inherited Notification(AComponent, Operation);
if (AComponent = FFocusControl) and (Operation = opRemove) then
FFocusControl := nil;
end;

procedure TeaLine.SetFocusControl(Value: TWinControl);
begin
if Value <> FFocusControl then
begin
if FFocusControl <> nil then
FFocusControl.RemoveFreeNotification(Self);
FFocusControl := Value;
if Value <> nil then
Value.FreeNotification(Self);
end;
end;

procedure TeaLine.WMActivate(var Message: TLMActivate);
begin
if (FFocusControl <> nil) and (FFocusControl.CanFocus) then
FFocusControl.SetFocus;
end;

function TeaLine.GetLabelText: string;
begin
Result := Caption;
end;

constructor TeaLine.Create(TheOwner: TComponent);
begin
inherited Create(TheOwner);
ControlStyle := [csCaptureMouse, csSetCaption, csClickEvents,
csDoubleClicks, csReplicatable];
with GetControlClassDefaultSize do
SetInitialBounds(0, 0, CX, CY);

FShowAccelChar := True;
FInternalSetBounds := False;
AutoSize := False;
// Accessibility
AccessibleRole := larLabel;

arrow := False;
self.OnMouseMove := @TTLiLineMouseMove;
end;

function TeaLine.GetTransparent: boolean;
begin
Result := not (csOpaque in ControlStyle);
end;


procedure TeaLine.SetTransparent(NewTransparent: boolean);
begin
if Transparent = NewTransparent then
exit;
if NewTransparent then
ControlStyle := ControlStyle - [csOpaque]
else
ControlStyle := ControlStyle + [csOpaque];
Invalidate;
end;

procedure TeaLine.TTLiLineMouseMove(Sender: TObject; Shift: TShiftState; X, Y: integer);
var
a, b, c, beginp, endp: TPoint;
s: double;
parentcurp, curp: tpoint;
i, ccc: integer;
Rect: TRect;
x11, x22, y11, y22: integer;
curcom: TeaLine;
pparent: TScrollingWinControl;//Twincontrol;
Hint0: string;
begin
//a.X := x;
//a.y := Y;
////b.x:=tealine(sender).x1;
////b.y:=tealine(sender).y1;
////c.x:=tealine(sender).x2;
////c.y:=tealine(sender).y2;
//b.x := x1 - min(x1, x2);
//b.y := y1 - min(y1, y2);
//c.x := x2 - min(x1, x2);
//c.y := y2 - min(y1, y2);
//s := S_abc(a, b, c);
//if s < 10 then
//begin
// tealine(Sender).Canvas.pen.Color := clblue;
// tealine(Sender).Canvas.pen.Width := 4;
// tealine(Sender).Canvas.Line(b.x, b.y, c.x, c.y);
//end;
// canvas.TextOut(0,0,floattostr(s));
//self.Hint:='www';
//self.ShowHint:=true;

curp.x := x;
curp.y := y;
//////////////////////
// parentcurp := self.ClientToScreen(curp);
parentcurp.x := curp.x + self.Left;
parentcurp.y := curp.Y + self.top;

// parentcurp.x := curp.x + TScrollingWinControl(self.parent).Left;
// parentcurp.y := curp.Y + TScrollingWinControl(self.Parent).top;


//////////////////////////
self.parentCursorX := parentcurp.x;
self.parentCursorY := parentcurp.y;
// self.Paint;
// curp := self.ScreenToClient(parentcurp);
// pparent:= self.parent;
// 检查是否应该将事件传递给下层组件
//if not (ssLeft in Shift) then // 如果不是拖动操作
//begin
// ParentForm := GetParentForm(Self);
// if Assigned(ParentForm) then
// begin
// // 将坐标转换为屏幕坐标
// LocalPoint := ClientToScreen(Point(X, Y));
//
// // 让父窗体处理鼠标消息分发
// ParentForm.Perform(LM_MOUSEMOVE, 0, MakeLParam(LocalPoint.X, LocalPoint.Y));
// end;
//end;
//pparent := TScrollingWinControl(self.parent);
//if self.parent.Parent <> nil then
// pparent := TScrollingWinControl(self.parent.Parent);
pparent := GetParentForm(Self);
ccc := (pparent).ComponentCount;
// ccc:= twincontrol(pparent).ComponentCount;

//if 1=2 then
//for i := 0 to twincontrol(self.parent).ComponentCount - 1 do
//for i := 0 to TScrollingWinControl(self.parent).ComponentCount - 1 do
for i := 0 to ccc - 1 do
begin
if (pparent).Components[i] is TeaLine then
begin
curcom := TeaLine((pparent).Components[i]);
Rect := curcom.clientRect;
// if TeaLine(twincontrol(self.parent).Components[i]) <> self then
if curcom.Parent=self.Parent then
if PointInRect(parentcurp, Rect) then
begin
// TeaLine(twincontrol(self.parent).Component[i]).TTLiLineMouseMove(TeaLine(twincontrol(self.parent).Component[i]),[],);
curcom.parentCursorX := parentcurp.x;
curcom.parentCursorY := parentcurp.y;
x11 := curcom.x1;
y11 := curcom.y1;
x22 := curcom.x2;
y22 := curcom.y2;


a.X := parentcurp.x - curcom.Left;
a.y := parentcurp.y - curcom.top;

b.x := x11 - min(x11, x22);
b.y := y11 - min(y11, y22);
c.x := x22 - min(x11, x22);
c.y := y22 - min(y11, y22);
s := SH_abc(a, b, c);
if s < 5 then
begin
//TeaLine(twincontrol(self.parent).Components[i]).Paint;
// 使用 BringToFront 和 SendToBack 方法管理组件层级
curcom.BringToFront;
application.ProcessMessages;
curcom.Paint;
application.ProcessMessages;
//Hint0 := Hint;
//if 1=2 then
if curcom.ShowHint then
begin
// curcom.Hint:='123';
// curcom.ShowHint := True;
//curcom.Hint := curcom.wwwHint;
//ShowHint := False;
// application.ProcessMessages;
// ShowHint := True;
// application.ProcessMessages;
end;
// else
if not curcom.ShowHint then
begin
// Hint := wwwHint;
// ShowHint := False;
// application.ProcessMessages;
end;

if 1 = 2 then
begin
curcom.Canvas.pen.Color := clblue;// clred;//clblue;
curcom.Canvas.pen.Width := 4;
curcom.Canvas.Line(b.x, b.y, c.x, c.y);
//TeaLine(twincontrol(self.parent).Components[i]).Canvas.AutoRedraw:=true;
//curcom.SetFocusControl(self.parent);
//curcom.Canvas.TextOut(b.x-5, b.y-5,'bbb');
//curcom.Canvas.TextOut(c.x-5, c.y-5,'ccc');
// curcom.Paint;
// curcom.Refresh;
// curcom.Canvas.Refresh;
// curcom.Click;
// application.ProcessMessages;
//beginp.x := x1;
//beginp.y := y1;
//endp.x := x2;
//endp.y := y2;
// DrawArrow(pparent.Canvas,beginp, endp);
beginp.x := x11;
beginp.y := y11;
endp.x := x22;
endp.y := y22;
// DrawArrow(TScrollingWinControl(self.parent).Canvas,beginp, endp);
if curcom.arrow then
DrawArrow(curcom.Canvas, b, c);
// curcom.canvas.Brush.Color:=clBtnFace;
// curcom.canvas.TextOut(0, 0, curcom.Name + 'TTLiLineMouseMovex=' + IntToStr(a.x) +
//'y=' + IntToStr(a.y));
self.Hint := curcom.Name;
self.ShowHint := True;

end;
end
else
begin
curcom.Canvas.pen.Color := clBtnFace;//clred;//clBtnFace;//clDefault;
curcom.Canvas.pen.Width := 4;
curcom.Canvas.Line(b.x, b.y, c.x, c.y);
////
beginp.x := x11;
beginp.y := y11;
endp.x := x22;
endp.y := y22;
// DrawArrow(pparent.Canvas,beginp, endp);
// DrawArrow(Canvas,beginp, endp);
if curcom.arrow then
DrawArrow(curcom.Canvas, b, c);
parentcurp.X := parentcursorx;
parentcurp.y := parentcursory;
////
curcom.Canvas.pen.Color := clblack;
curcom.Canvas.pen.Width := 1;
curcom.Canvas.Line(b.x, b.y, c.x, c.y);
if curcom.arrow then
DrawArrow(curcom.Canvas, b, c);
//parentcurp.X := parentcursorx;
//parentcurp.y := parentcursory;
// curcom.canvas.Brush.Color:=clBtnFace;
// curcom.canvas.TextOut(0, 0, curcom.Name + 'TTLiLineMouseMovex=' + IntToStr(a.x) +
//'y=' + IntToStr(a.y));
// self.Hint:=curcom.Name;
// self.ShowHint:=true;
end;
// TeaLine(twincontrol(self.parent).Components[i]).canvas.TextOut(0, 0, floattostr(s));
// self.Refresh;
// curcom.canvas.Brush.Color:=clBtnFace;
// curcom.canvas.TextOut(0, 0, curcom.Parent.Name + 'x=' + IntToStr(a.x) +
// 'y=' + IntToStr(a.y));
// Tform(twincontrol(self.parent)).canvas.FillRect(x11,y11,x22,y22);

//curcom.Paint;
// TeaLine(twincontrol(self.parent).Components[i]).Paint;
end;
end;

end;
if 1 = 2 then
begin
pparent := TScrollingWinControl(self.parent);
// if pparent.AutoScroll then
begin
if (pparent.HorzScrollBar = nil) or (pparent.VertScrollBar = nil) then Exit;
if pparent.HorzScrollBar.Visible or pparent.VertScrollBar.Visible then
pparent.UpdateScrollBars;
end;
if self.parent.Parent <> nil then
pparent := TScrollingWinControl(self.parent.Parent);
// if pparent.AutoScroll then
begin
if (pparent.HorzScrollBar = nil) or (pparent.VertScrollBar = nil) then Exit;
if pparent.HorzScrollBar.Visible or pparent.VertScrollBar.Visible then
pparent.UpdateScrollBars;
end;
//procedure TScrollingWinControl.DoOnResize;
//begin
// inherited DoOnResize;
// if AutoScroll then
// begin
// if (HorzScrollBar = nil) or (VertScrollBar = nil) then Exit;
// if HorzScrollBar.Visible or VertScrollBar.Visible then UpdateScrollBars;
// end;
// //debugln(['TScrollingWinControl.DoOnResize ',DbgSName(Self),' ',dbgs(BoundsRect),' ',dbgs(ClientRect),' ',dbgs(GetLogicalClientRect)]);
//end;

end;
end;

procedure TeaLine.Paint;
var
R, CalcRect: TRect;
TextLeft, TextTop: integer;
Flags: longint;
angle: double;
parentcurp, curp: tpoint;

a, b, c, beginp, endp: TPoint;
s: double;
pparent: TScrollingWinControl;
begin
//TScrollingWinControl(parent).Canvas.Line(x1,y1,x2,y2);
Canvas.pen.Color := clblack;//clred;//clblack;
Canvas.pen.Width := 1;
self.Left := min(x1, x2);
self.top := min(y1, y2);
self.Width := abs(x1 - x2); //max(x1,x2)-min(x1,x2);
self.Height := abs(y1 - y2);
// self.Canvas.FillRect(self.ClientRect);
// Canvas.Line(x1,y1,x2,y2);
// Canvas.Line(0,0,Width,Height);
// R:= GetClientRect;
//SetInitialBounds(0, 0, r.Right-r.left, r.bottom-r.top);
if ((left = x1) and (top = y1)) then
Canvas.Line(0, 0, Width, Height);
if ((left = x1) and (top = y2)) then
Canvas.Line(0, Height, Width, 0);
if ((left = x2) and (top = y1)) then
Canvas.Line(0, Height, Width, 0);
if ((left = x2) and (top = y2)) then
Canvas.Line(0, 0, Width, Height);


//TScrollingWinControl(parent).Canvas.pen.Color := clblack;//clred;//clblack;
//TScrollingWinControl(parent).Canvas.pen.Width := 1;
//TScrollingWinControl(parent).Canvas.Line(x1,y1,x2,y2);
b.x := x1 - min(x1, x2);
b.y := y1 - min(y1, y2);
c.x := x2 - min(x1, x2);
c.y := y2 - min(y1, y2);
if arrow then
DrawArrow(Canvas, b, c);

//exit;

//self.Refresh;

parentcurp.X := parentcursorx;
parentcurp.y := parentcursory;
// 在 FMX（跨平台框架）中，没有直接的 PtInRect，但提供了类似功能：
// TRectF.Contains(Point: TPointF) 方法可用于判断点是否在 TRectF
//PointInRect(const Poin: TPoint; const Rect: TRect): Boolean
//可结合 PtInRect 与 ClientToScreen/ScreenToClient 实现复杂点击
// curp := self.ScreenToClient(parentcurp);
// canvas.Brush.Color:=clred;
// canvas.FillRect(x1,y1,x2,y2);

if PointInRect(parentcurp, self.clientRect) then
begin
//TTLiLineMouseMove(self, [], curp.x, curp.y);
curp.x := parentcurp.X - self.Left;
curp.Y := parentcurp.y - self.top;
a.X := curp.x;
a.y := curp.Y;
//b.x:=tealine(sender).x1;
//b.y:=tealine(sender).y1;
//c.x:=tealine(sender).x2;
//c.y:=tealine(sender).y2;
b.x := x1 - min(x1, x2);
b.y := y1 - min(y1, y2);
c.x := x2 - min(x1, x2);
c.y := y2 - min(y1, y2);
s := SH_abc(a, b, c);
if s < 5 then
begin
Canvas.pen.Color := clblue;
Canvas.pen.Width := 4;
Canvas.Line(b.x, b.y, c.x, c.y);
//beginp.x := x1;
//beginp.y := y1;
//endp.x := x2;
//endp.y := y2;
if arrow then
DrawArrow(Canvas, b, c);

// if ShowHint then
begin
// hint:=wwwhint;
//ShowHint := False;
//application.ProcessMessages;
//ShowHint := True;
//application.ProcessMessages;
end;
end;
end;
//canvas.TextOut(0, 0, floattostr(s));
// self.Hint := self.classname;//'www';
// self.ShowHint := True;
// canvas.Brush.Color:=clBtnFace;
//canvas.TextOut(0, 0, Name + 'Paintx=' + IntToStr(a.x) +
// 'y=' + IntToStr(a.y));
// application.ProcessMessages;
end;


class procedure TeaLine.WSRegisterClass;
begin
inherited WSRegisterClass;

end;

/////come from AI
//Hint 管理解决方案
//
//pascal
//Copy Code
//// 在 TeaLine 类中添加
//private
// FHintWindow: THintWindow;
// FLastHintPos: TPoint;
// FLastHintTime: TDateTime;
//
//// 修改鼠标移动事件处理
//procedure TeaLine.TTLiLineMouseMove(Sender: TObject; Shift: TShiftState; X, Y: integer);
//var
// Distance: Double;
// CurrentPos: TPoint;
//begin
// // ... 其他代码 ...
//
// // 处理 Hint 显示
// CurrentPos := Point(X, Y);
// if (Self.Hint <> '') and Self.ShowHint then
// begin
// // 检查鼠标移动距离是否足够小
// Distance := Sqrt(Sqr(FLastHintPos.X - CurrentPos.X) +
// Sqr(FLastHintPos.Y - CurrentPos.Y));
//
// if (Distance < 5) and ((Now - FLastHintTime) > 0.5/86400) then // 0.5秒
// begin
// ShowCustomHint(CurrentPos);
// FLastHintTime := Now;
// end
// else if Distance >= 5 then
// begin
// HideHint;
// FLastHintPos := CurrentPos;
// end;
// end
// else
// HideHint;
//end;
//
//procedure TeaLine.ShowCustomHint(Position: TPoint);
//var
// HintRect: TRect;
// Offset: TPoint;
//begin
// if not Assigned(FHintWindow) then
// FHintWindow := THintWindow.Create(Self);
//
// HintRect := FHintWindow.CalcHintRect(300, Self.Hint, nil);
// Offset := ClientToScreen(Point(0, 0));
//
// OffsetRect(HintRect, Offset.X + Position.X + 16, Offset.Y + Position.Y + 16);
// FHintWindow.ActivateHint(HintRect, Self.Hint);
//end;
//
//procedure TeaLine.HideHint;
//begin
// if Assigned(FHintWindow) then
// FHintWindow.ReleaseHandle;
//end;
//

//1)若oneline.paint再application. processmessage再oneline.paint,则自动产生scrollBar,若TeaLine组件内onPaint代码去掉self. refresh亦自力产生滚动条.讲明...
//这种事系统级常非下级可控制
//2)TeaLine互相覆盖, MouseMove可判断,然后bringToFront再自然hint
//3)hintWindow或可自定义
//4)要通过getparent或
//getparentForm,再componetCount,这个有没更好算法
end.

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