| 1 | UNIT Gradient;
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| 2 |
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| 3 | INTERFACE
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| 4 |
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| 5 | USES Classes, Forms, Graphics;
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| 6 |
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| 7 | TYPE
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| 8 | TDirection = (dLeft, dRight, dUp, dDown);
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| 9 |
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| 10 | TGradient = CLASS(TControl)
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| 11 | PRIVATE
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| 12 | FDirection : TDirection;
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| 13 | FStartColor : TColor;
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| 14 | FEndColor : TColor;
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| 15 | PROCEDURE SetDirection(NewDirection:TDirection);
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| 16 | PROCEDURE SetStartColor(NewColor:TColor);
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| 17 | PROCEDURE SetEndColor(NewColor:TColor);
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| 18 | PROPERTY Caption;
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| 19 | PROPERTY Font;
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| 20 | PROPERTY Color;
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| 21 | PROPERTY PenColor;
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| 22 | PROPERTY ParentColor;
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| 23 | PROPERTY ParentPenColor;
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| 24 | PROPERTY TabStop;
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| 25 | PROTECTED
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| 26 | PROCEDURE SetupComponent; OVERRIDE;
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| 27 | PUBLIC
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| 28 | PROCEDURE Redraw(CONST rc:TRect); OVERRIDE;
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| 29 | PUBLISHED
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| 30 | PROPERTY Align;
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| 31 | PROPERTY DragCursor;
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| 32 | PROPERTY DragMode;
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| 33 | PROPERTY Enabled;
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| 34 | PROPERTY ParentFont;
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| 35 | PROPERTY ParentShowHint;
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| 36 | PROPERTY PopupMenu;
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| 37 | PROPERTY ShowHint;
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| 38 | PROPERTY TabOrder;
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| 39 | PROPERTY Visible;
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| 40 | PROPERTY ZOrder;
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| 41 |
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| 42 | PROPERTY OnCanDrag;
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| 43 | PROPERTY OnCommand;
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| 44 | PROPERTY OnDblClick;
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| 45 | PROPERTY OnDragDrop;
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| 46 | PROPERTY OnDragOver;
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| 47 | PROPERTY OnEndDrag;
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| 48 | PROPERTY OnEnter;
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| 49 | PROPERTY OnExit;
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| 50 | PROPERTY OnFontChange;
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| 51 | PROPERTY OnMouseClick;
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| 52 | PROPERTY OnMouseDblClick;
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| 53 | PROPERTY OnMouseDown;
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| 54 | PROPERTY OnMouseMove;
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| 55 | PROPERTY OnMouseUp;
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| 56 | PROPERTY OnResize;
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| 57 | PROPERTY OnSetupShow;
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| 58 | PROPERTY OnStartDrag;
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| 59 | PROPERTY Direction:TDirection read FDirection write SetDirection;
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| 60 | PROPERTY StartColor:TColor read FStartColor write SetStartColor;
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| 61 | PROPERTY EndColor:TColor read FEndColor write SetEndColor;
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| 62 | END;
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| 63 |
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| 64 | IMPLEMENTATION
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| 65 |
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| 66 | PROCEDURE TGradient.SetDirection(NewDirection:TDirection);
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| 67 | BEGIN
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| 68 | FDirection:=NewDirection;
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| 69 | Invalidate;
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| 70 | END;
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| 71 |
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| 72 | PROCEDURE TGradient.SetStartColor(NewColor:TColor);
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| 73 | BEGIN
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| 74 | FStartColor:=NewColor;
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| 75 | Invalidate;
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| 76 | END;
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| 77 |
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| 78 | PROCEDURE TGradient.SetEndColor(NewColor:TColor);
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| 79 | BEGIN
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| 80 | FEndColor:=NewColor;
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| 81 | Invalidate;
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| 82 | END;
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| 83 |
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| 84 | PROCEDURE TGradient.SetupComponent;
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| 85 | BEGIN
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| 86 | Inherited SetUpComponent;
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| 87 | Name:= 'Gradient';
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| 88 | FDirection:= dUp;
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| 89 | FStartColor:=clBlack;
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| 90 | FEndColor:=clBlue;
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| 91 | Width:=200;
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| 92 | Height:=200;
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| 93 | ZOrder:=zoBottom;
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| 94 | TabStop:=FALSE;
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| 95 | END;
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| 96 |
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| 97 | PROCEDURE TGradient.Redraw(CONST rc:TRect);
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| 98 | VAR
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| 99 | SaveColor:TColor;
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| 100 | DRed,DGreen,DBlue,DR,DG,DB:Extended;
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| 101 | StartLoop,EndLoop:LONGINT;
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| 102 | rec:TRect;
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| 103 | BEGIN
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| 104 | SaveColor:=Canvas.Pen.Color;
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| 105 | Canvas.ClipRect:=rc;
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| 106 |
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| 107 | DRed:=TRGB(FStartColor).Red;
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| 108 | DGreen:=TRGB(FStartColor).Green;
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| 109 | DBlue:=TRGB(FStartColor).Blue;
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| 110 | DR:=TRGB(FEndColor).Red-DRed;
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| 111 | DG:=TRGB(FEndColor).Green-DGreen;
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| 112 | DB:=TRGB(FEndColor).Blue-DBlue;
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| 113 |
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| 114 | CASE FDirection OF
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| 115 | dUp,dDown,dLeft,dRight:
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| 116 | BEGIN
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| 117 | IF FDirection IN [dUp,dDown] THEN
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| 118 | BEGIN
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| 119 | DR:=DR / Height;
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| 120 | DG:=DG / Height;
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| 121 | DB:=DB / Height;
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| 122 | END
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| 123 | ELSE
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| 124 | BEGIN
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| 125 | DR:=DR / Width;
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| 126 | DG:=DG / Width;
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| 127 | DB:=DB / Width;
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| 128 | END;
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| 129 |
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| 130 | IF FDirection=dUp THEN
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| 131 | BEGIN
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| 132 | StartLoop:=0;
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| 133 | EndLoop:=Height+1;
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| 134 | END
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| 135 | ELSE IF FDirection=dDown THEN
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| 136 | BEGIN
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| 137 | StartLoop:=Height+1;
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| 138 | EndLoop:=0;
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| 139 | END
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| 140 | ELSE IF FDirection=dLeft THEN
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| 141 | BEGIN
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| 142 | StartLoop:=0;
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| 143 | EndLoop:=Width+1;
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| 144 | END
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| 145 | ELSE
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| 146 | BEGIN
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| 147 | StartLoop:=Width+1;
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| 148 | EndLoop:=0;
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| 149 | END;
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| 150 |
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| 151 | WHILE StartLoop<>EndLoop DO
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| 152 | BEGIN
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| 153 | IF FDirection IN [dUp,dDown] THEN
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| 154 | BEGIN
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| 155 | rec.Left:=0;
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| 156 | rec.Right:=Width;
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| 157 | rec.Bottom:=StartLoop;
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| 158 | rec.Top:=rec.Bottom+1;
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| 159 | END
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| 160 | ELSE
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| 161 | BEGIN
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| 162 | rec.Left:=StartLoop;
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| 163 | rec.Right:=rec.Left+1;
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| 164 | rec.Bottom:=0;
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| 165 | rec.Top:=Height;
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| 166 | END;
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| 167 | Canvas.FillRect(rec,ValuesToRGB(Round(DRed),Round(DGreen),Round(DBlue)));
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| 168 |
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| 169 | DRed:=DRed+DR;
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| 170 | DGreen:=DGreen+DG;
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| 171 | DBlue:=DBlue+DB;
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| 172 |
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| 173 | IF FDirection IN [dUp,dLeft] THEN inc(StartLoop)
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| 174 | ELSE dec(StartLoop);
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| 175 | END;
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| 176 | END;
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| 177 | END; //case
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| 178 |
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| 179 | Canvas.Pen.Color:=SaveColor;
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| 180 | Canvas.DeleteClipRegion;
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| 181 | end;
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| 182 |
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| 183 | begin
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| 184 | RegisterClasses([TGradient]);
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| 185 | end.
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