Delphi 与 DirectX 之 DelphiX(81): TDIB.ColoredLine();

本例效果图:

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代码文件:

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DIB, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    DXPaintBox1: TDXPaintBox;
    RadioGroup1: TRadioGroup;
    RadioGroup2: TRadioGroup;
    Button1: TButton;
    LabeledEdit1: TLabeledEdit;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses TypInfo;

procedure TForm1.Button1Click(Sender: TObject);
var
  w,h: Integer;
  pt1,pt2,pt3,pt4: TPoint;
begin
  w := DXPaintBox1.ClientWidth;
  h := DXPaintBox1.ClientHeight;

  pt1 := Point(w div 6, h div 3);
  pt2 := Point(w div 6 * 5, h div 3);

  pt3 := Point(w div 6, h div 3 * 2);
  pt4 := Point(w div 6 * 5, h div 3 * 2);

  DXPaintBox1.DIB.SetSize(w, h, 24);
  DXPaintBox1.DIB.FillDIB8(0);  {快速填充}

  DXPaintBox1.DIB.ColoredLine(pt1, pt2,
                              TColorLineStyle(RadioGroup1.ItemIndex),
                              clRed, clYellow,
                              TColorLinePixelGeometry(RadioGroup2.ItemIndex),
                              StrToIntDef(LabeledEdit1.Text, 1));

  DXPaintBox1.DIB.ColoredLine(pt3, pt4,
                              TColorLineStyle(RadioGroup1.ItemIndex),
                              clWhite, clBlue,
                              TColorLinePixelGeometry(RadioGroup2.ItemIndex),
                              StrToIntDef(LabeledEdit1.Text, 1));

  DXPaintBox1.Repaint;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  i: Integer;
begin
  DXPaintBox1.Align := alTop;
  LabeledEdit1.EditLabel.Caption := '线宽';
  LabeledEdit1.Text := '10';

  RadioGroup1.Caption := 'TColorLineStyle';
  RadioGroup2.Caption := 'TColorLinePixelGeometry';

  for i := 0 to 2 do begin {巧了, 这两个枚举都包含 3 个元素}
    RadioGroup1.Items.Add(GetEnumName(TypeInfo(TColorLineStyle), i));
    RadioGroup2.Items.Add(GetEnumName(TypeInfo(TColorLinePixelGeometry), i));
  end;

  RadioGroup1.ItemIndex := 1;
  RadioGroup2.ItemIndex := 2;

  RadioGroup1.OnClick := Button1Click;
  RadioGroup2.OnClick := Button1Click;
  LabeledEdit1.OnChange := Button1Click;
  //Button1.Click;
end;

end.

窗体文件:

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object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 214
  ClientWidth = 335
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  OnCreate = FormCreate
  PixelsPerInch = 96
  TextHeight = 13
  object DXPaintBox1: TDXPaintBox
    Left = 0
    Top = 0
    Width = 121
    Height = 129
    AutoStretch = False
    Center = False
    KeepAspect = False
    Stretch = False
    ViewWidth = 0
    ViewHeight = 0
  end
  object RadioGroup1: TRadioGroup
    Left = 8
    Top = 135
    Width = 97
    Height = 71
    Caption = 'RadioGroup1'
    TabOrder = 0
  end
  object RadioGroup2: TRadioGroup
    Left = 111
    Top = 135
    Width = 138
    Height = 71
    Caption = 'RadioGroup2'
    TabOrder = 1
  end
  object Button1: TButton
    Left = 255
    Top = 181
    Width = 75
    Height = 25
    Caption = 'Button1'
    TabOrder = 2
    OnClick = Button1Click
  end
  object LabeledEdit1: TLabeledEdit
    Left = 263
    Top = 154
    Width = 43
    Height = 21
    EditLabel.Width = 61
    EditLabel.Height = 13
    EditLabel.Caption = 'LabeledEdit1'
    TabOrder = 3
  end
end