Double Gradient/de: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: Double Gradient/de
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|---|---|---|---|
| 1 | + | Jetzt sind 'DoubleGradientAlphaFill' & 'nGradientAlphaFill' in [[BGRABitmap/de|BGRABitmap]] enthalten, in der Unit 'BGRAGradients'. | |
| 2 | + | ||
| 3 | + | ## Double Gradient | |
| 4 | + | ||
| 5 | + | <figure> | |
| 6 | + | <img src="sampledoublegd.png" title="sampledoublegd.png" /> | |
| 7 | + | <figcaption>sampledoublegd.png</figcaption> | |
| 8 | + | </figure> | |
| 9 | + | ||
| 10 | + | ### Unit | |
| 11 | + | ||
| 12 | + | #### DoubleGradient | |
| 13 | + | ||
| 14 | + | ``` pascal | |
| 15 | + | unit doublegradient; | |
| 16 | + | ||
| 17 | + | {$mode objfpc}{$H+} | |
| 18 | + | ||
| 19 | + | interface | |
| 20 | + | ||
| 21 | + | uses | |
| 22 | + | Classes, Graphics; | |
| 23 | + | ||
| 24 | + | function DoubleGradientFill(ARect: TRect; AStart1,AStop1,AStart2,AStop2: TColor; | |
| 25 | + | ADirection1,ADirection2,APos: TGradientDirection; AValue: Single): TBitmap; | |
| 26 | + | ||
| 27 | + | implementation | |
| 28 | + | ||
| 29 | + | function DoubleGradientFill(ARect: TRect; AStart1,AStop1,AStart2,AStop2: TColor; | |
| 30 | + | ADirection1,ADirection2,APos: TGradientDirection; AValue: Single): TBitmap; | |
| 31 | + | var | |
| 32 | + | ABitmap: TBitmap; ARect1,ARect2: TRect; | |
| 33 | + | begin | |
| 34 | + | ABitmap := TBitmap.Create; | |
| 35 | + | ABitmap.Width:=ARect.Right; | |
| 36 | + | ABitmap.Height:=ARect.Bottom; | |
| 37 | + | if AValue <> 0 then ARect1:=ARect; | |
| 38 | + | if AValue <> 1 then ARect2:=ARect; | |
| 39 | + | if APos = gdVertical then begin | |
| 40 | + | ARect1.Bottom:=Round(ARect1.Bottom * AValue); | |
| 41 | + | ARect2.Top:=ARect1.Bottom; | |
| 42 | + | end | |
| 43 | + | else if APos = gdHorizontal then begin | |
| 44 | + | ARect1.Right:=Round(ARect1.Right * AValue); | |
| 45 | + | ARect2.Left:=ARect1.Right; | |
| 46 | + | end; | |
| 47 | + | if AValue <> 0 then ABitmap.Canvas.GradientFill(ARect1,AStart1,AStop1,ADirection1); | |
| 48 | + | if AValue <> 1 then ABitmap.Canvas.GradientFill(ARect2,AStart2,AStop2,ADirection2); | |
| 49 | + | Result:=ABitmap; | |
| 50 | + | end; | |
| 51 | + | ||
| 52 | + | end. | |
| 53 | + | ``` | |
| 54 | + | ||
| 55 | + | #### DoubleGradientAlpha | |
| 56 | + | ||
| 57 | + | Diese Unit erfordert [[BGRABitmap/de|BGRABitmap]]. | |
| 58 | + | ||
| 59 | + | ``` pascal | |
| 60 | + | unit doublegradientalpha; | |
| 61 | + | ||
| 62 | + | {$mode objfpc}{$H+} | |
| 63 | + | ||
| 64 | + | interface | |
| 65 | + | ||
| 66 | + | uses | |
| 67 | + | Classes, Graphics, | |
| 68 | + | BGRABitmap, BGRABitmapTypes; | |
| 69 | + | ||
| 70 | + | function DoubleGradientAlphaFill(ARect: TRect; AStart1,AStop1,AStart2,AStop2: TBGRAPixel; | |
| 71 | + | ADirection1,ADirection2,APos: TGradientDirection; AValue: Single): TBGRABitmap; | |
| 72 | + | ||
| 73 | + | implementation | |
| 74 | + | ||
| 75 | + | function DoubleGradientAlphaFill(ARect: TRect; AStart1,AStop1,AStart2,AStop2: TBGRAPixel; | |
| 76 | + | ADirection1,ADirection2,APos: TGradientDirection; AValue: Single): TBGRABitmap; | |
| 77 | + | var | |
| 78 | + | ABitmap: TBGRABitmap; ARect1,ARect2: TRect; APoint1,APoint2,APoint3,APoint4: TPointF; | |
| 79 | + | begin | |
| 80 | + | ABitmap := TBGRABitmap.Create(ARect.Right,ARect.Bottom); | |
| 81 | + | if AValue <> 0 then ARect1:=ARect; | |
| 82 | + | if AValue <> 1 then ARect2:=ARect; | |
| 83 | + | if APos = gdVertical then begin | |
| 84 | + | ARect1.Bottom:=Round(ARect1.Bottom * AValue); | |
| 85 | + | ARect2.Top:=ARect1.Bottom; | |
| 86 | + | end | |
| 87 | + | else if APos = gdHorizontal then begin | |
| 88 | + | ARect1.Right:=Round(ARect1.Right * AValue); | |
| 89 | + | ARect2.Left:=ARect1.Right; | |
| 90 | + | end; | |
| 91 | + | if ADirection1 = gdVertical then begin | |
| 92 | + | APoint1:=PointF(ARect1.Left,ARect1.Top); | |
| 93 | + | APoint2:=PointF(ARect1.Left,ARect1.Bottom); | |
| 94 | + | end | |
| 95 | + | else if ADirection1 = gdHorizontal then begin | |
| 96 | + | APoint1:=PointF(ARect1.Left,ARect1.Top); | |
| 97 | + | APoint2:=PointF(ARect1.Right,ARect1.Top); | |
| 98 | + | end; | |
| 99 | + | if ADirection2 = gdVertical then begin | |
| 100 | + | APoint3:=PointF(ARect2.Left,ARect2.Top); | |
| 101 | + | APoint4:=PointF(ARect2.Left,ARect2.Bottom); | |
| 102 | + | end | |
| 103 | + | else if ADirection2 = gdHorizontal then begin | |
| 104 | + | APoint3:=PointF(ARect2.Left,ARect2.Top); | |
| 105 | + | APoint4:=PointF(ARect2.Right,ARect2.Top); | |
| 106 | + | end; | |
| 107 | + | if AValue <> 0 then | |
| 108 | + | ABitmap.GradientFill(ARect1.Left,ARect1.Top,ARect1.Right,ARect1.Bottom, | |
| 109 | + | AStart1,AStop1,gtLinear,APoint1,APoint2,dmDrawWithTransparency,True,False); | |
| 110 | + | if AValue <> 1 then | |
| 111 | + | ABitmap.GradientFill( ARect2.Left,ARect2.Top,ARect2.Right,ARect2.Bottom, | |
| 112 | + | AStart2,AStop2,gtLinear,APoint3,APoint4,dmDrawWithTransparency,True,False); | |
| 113 | + | Result:=ABitmap; | |
| 114 | + | end; | |
| 115 | + | ||
| 116 | + | end. | |
| 117 | + | ``` | |
| 118 | + | ||
| 119 | + | ### Gebrauch | |
| 120 | + | ||
| 121 | + | Erstens benötigen Sie eine 'TBitmap' um den Gradienten zu speichern, dann können Sie das Image zeichnen, beispielsweise im gesamten sichtbaren Bereich der 'Form1': | |
| 122 | + | ||
| 123 | + | <figure> | |
| 124 | + | <img src="defaultdbgd.png" title="defaultdbgd.png" /> | |
| 125 | + | <figcaption>defaultdbgd.png</figcaption> | |
| 126 | + | </figure> | |
| 127 | + | ||
| 128 | + | *Dies ist das Ergebnis (verwendet DoubleGradientFill).* | |
| 129 | + | ||
| 130 | + | ``` pascal | |
| 131 | + | procedure TForm1.FormPaint(Sender: TObject); | |
| 132 | + | var | |
| 133 | + | ABitmap: TBitmap; | |
| 134 | + | begin | |
| 135 | + | ABitmap:=DoubleGradientFill(Self.ClientRect,clMedGray,clWhite,clSilver,clGray,gdVertical,gdVertical,gdVertical,0.50); | |
| 136 | + | Self.Canvas.Draw(0,0,ABitmap); | |
| 137 | + | ABitmap.Free | |
| 138 | + | end; | |
| 139 | + | ``` | |
| 140 | + | ||
| 141 | + | Wenn Sie 'DoubleGradientAlphaFill' benutzen, fügen Sie zuerst 'BGRABitmap' und 'BGRABitmapTypes' in der Sektion Uses hinzu, dann wenden Sie die Funktion an: | |
| 142 | + | ||
| 143 | + | ``` pascal | |
| 144 | + | var | |
| 145 | + | myBitmap: TBGRABitmap; | |
| 146 | + | begin | |
| 147 | + | myBitmap:= DoubleGradientAlphaFill( | |
| 148 | + | Self.ClientRect, | |
| 149 | + | BGRA(0,0,0,10),BGRA(255,255,255,100), | |
| 150 | + | BGRA(100,100,100,255),BGRA(150,150,150,10), | |
| 151 | + | gdVertical,gdVertical,gdVertical,0.5); | |
| 152 | + | Self.Canvas.Draw(0,0,myBitmap.Bitmap); | |
| 153 | + | myBitmap.Free; | |
| 154 | + | end; | |
| 155 | + | ``` | |
| 156 | + | ||
| 157 | + | ### Editor | |
| 158 | + | ||
| 159 | + | Sie können aber auch den 'Double Gradient Editor' verwenden. Das ist ein GUI-Programm, das sofort ein sichtbares Ergebnis liefert (nur bei doppelten Gradienten). Speichern Sie den Gradienten in einer Bitmap-Datei (oder als '*.doublegradient' Sitzungsdatei) oder kopieren Sie einfach den Code in die Zwischenablage um ihn in Lazarus zu verwenden. | |
| 160 | + | ||
| 161 | + | <figure> | |
| 162 | + | <img src="dbgedit.png" title="dbgedit.png" /> | |
| 163 | + | <figcaption>dbgedit.png</figcaption> | |
| 164 | + | </figure> | |
| 165 | + | ||
| 166 | + | - Ein Rechtsklick auf die Scrollbox (den Gradientenbereich) zeigt das Kontextmenü an: | |
| 167 | + | - Save bitmap.. Zeigt einen Dialog zum Speichern als *.bmp Datei. | |
| 168 | + | - Load gradient.. Zeigt einen Dialog zum Laden einer *.doublegradient Sitzungsdatei. | |
| 169 | + | - Save gradient.. Zeigt einen Dialog zum Speichern der aktuellen Einstellungen in einer Sitzungsdatei. | |
| 170 | + | - Copy code to clipboard.. Kopiert einfach die Einstellungen in Textform in die Zwischenablage, die Sie dann im Lazarus-Quelltexteditor einfügen können, um die 'doublegradientfill'-Prozedur aufzurufen. | |
| 171 | + | ||
| 172 | + | - default.doublegradient: Diese Datei enthält die letzten Einstellungen im Editor, wird beim Start geladen und beim Programmende gespeichert. | |
| 173 | + | ||
| 174 | + | [Double Gradient Editor 1.0 Source Code](http://www.multiupload.com/5WJ6N8E0N0) dbgdedit1.0.zip (5.64 KB) | |
| 175 | + | ||
| 176 | + | Bearbeiten und verbessern Sie diesen Editor nach Belieben, natürlich kostenlos. | |
| 177 | + | ||
| 178 | + | ## nGradient | |
| 179 | + | ||
| 180 | + | Mit dieser Unit 'ngradient' können Sie ganz einfach Farbverläufe (= Gradienten) für Toolbars, Schaltflächen, etc... erzeugen. Speichern Sie den untenstehenden Code in einer Textdatei 'ngradient.pas' und fügen Sie 'ngradient' im Abschnitt 'uses' von Ihrem Projekt hinzu. | |
| 181 | + | ||
| 182 | + | ### Unit | |
| 183 | + | ||
| 184 | + | #### nGradientFill | |
| 185 | + | ||
| 186 | + | Kopieren Sie den Code und speichern Sie ihn in einer Textdatei namens 'ngradient.pas': | |
| 187 | + | ||
| 188 | + | ``` pascal | |
| 189 | + | unit ngradient; | |
| 190 | + | ||
| 191 | + | {$mode objfpc}{$H+} | |
| 192 | + | ||
| 193 | + | interface | |
| 194 | + | ||
| 195 | + | uses | |
| 196 | + | Classes, Graphics; | |
| 197 | + | ||
| 198 | + | type | |
| 199 | + | TnGradientInfo = record | |
| 200 | + | StartColor,StopColor:TColor; | |
| 201 | + | Direction: TGradientDirection; | |
| 202 | + | endPercent:single; // This is not the percent of the width, this is the percent of the end of the rect- which means, if this value is 1 - the rect could be from 0.99 to 1 and needs not be from 0 to 1 | |
| 203 | + | end; | |
| 204 | + | ||
| 205 | + | function nGradientFill(ARect: TRect;APos: TGradientDirection; AGradient: array of TnGradientInfo): TBitmap; | |
| 206 | + | ||
| 207 | + | implementation | |
| 208 | + | ||
| 209 | + | function nGradientFill(ARect: TRect;APos: TGradientDirection; AGradient: array of TnGradientInfo): TBitmap; | |
| 210 | + | var | |
| 211 | + | i:integer; | |
| 212 | + | AnRect,OldRect: TRect; | |
| 213 | + | begin | |
| 214 | + | Result := TBitmap.Create; | |
| 215 | + | Result.Width:=ARect.Right-ARect.Left; | |
| 216 | + | Result.Height:=ARect.Bottom-ARect.Top; | |
| 217 | + | OldRect := ARect; | |
| 218 | + | if APos = gdVertical then OldRect.Bottom := ARect.Top | |
| 219 | + | else OldRect.Right := ARect.Left ; // upside down... in case of i = 0... | |
| 220 | + | ||
| 221 | + | for i := 0 to high(AGradient) do | |
| 222 | + | begin | |
| 223 | + | AnRect:=OldRect; | |
| 224 | + | if APos = gdVertical then | |
| 225 | + | begin | |
| 226 | + | AnRect.Bottom:=Round((ARect.Bottom-ARect.Top) * AGradient[i].endPercent + ARect.Top); | |
| 227 | + | AnRect.Top:=OldRect.Bottom; | |
| 228 | + | end | |
| 229 | + | else | |
| 230 | + | begin | |
| 231 | + | AnRect.Right:=Round((ARect.Right-ARect.Left) * AGradient[i].endPercent + ARect.Left); | |
| 232 | + | AnRect.Left:=OldRect.Right; | |
| 233 | + | end; | |
| 234 | + | ||
| 235 | + | Result.Canvas.GradientFill(AnRect,AGradient[i].StartColor,AGradient[i].StopColor,AGradient[i].Direction); | |
| 236 | + | OldRect := AnRect; | |
| 237 | + | end; | |
| 238 | + | end; | |
| 239 | + | ``` | |
| 240 | + | ||
| 241 | + | #### nGradientAlphaFill | |
| 242 | + | ||
| 243 | + | Diese Unit erfordert [[BGRABitmap/de|BGRABitmap]]. | |
| 244 | + | ||
| 245 | + | Kopieren Sie den Code und speichern Sie ihn in einer Textdatei namens 'ngradientalpha.pas': | |
| 246 | + | ||
| 247 | + | ``` pascal | |
| 248 | + | unit ngradientalpha; | |
| 249 | + | ||
| 250 | + | {$mode objfpc}{$H+} | |
| 251 | + | ||
| 252 | + | interface | |
| 253 | + | ||
| 254 | + | uses | |
| 255 | + | Classes, Graphics, BGRABitmap, BGRABitmapTypes; | |
| 256 | + | ||
| 257 | + | type | |
| 258 | + | TnGradientInfo = record | |
| 259 | + | StartColor, StopColor : TBGRAPixel; | |
| 260 | + | Direction : TGradientDirection; | |
| 261 | + | endPercent : single; | |
| 262 | + | end; | |
| 263 | + | ||
| 264 | + | function nGradientAlphaFill(ARect: TRect;APos: TGradientDirection; | |
| 265 | + | AGradient: array of TnGradientInfo): TBGRABitmap; | |
| 266 | + | ||
| 267 | + | implementation | |
| 268 | + | ||
| 269 | + | function nGradientAlphaFill(ARect: TRect;APos: TGradientDirection; | |
| 270 | + | AGradient: array of TnGradientInfo): TBGRABitmap; | |
| 271 | + | var | |
| 272 | + | i:integer; AnRect, OldRect: TRect; Point1, Point2: TPointF; | |
| 273 | + | begin | |
| 274 | + | Result := TBGRABitmap.Create(ARect.Right-ARect.Left,ARect.Bottom-ARect.Top); | |
| 275 | + | OldRect := ARect; | |
| 276 | + | if APos = gdVertical then OldRect.Bottom := ARect.Top else OldRect.Right := ARect.Left; | |
| 277 | + | for i := 0 to high(AGradient) do | |
| 278 | + | begin | |
| 279 | + | AnRect:=OldRect; | |
| 280 | + | if APos = gdVertical then begin | |
| 281 | + | AnRect.Bottom:=Round((ARect.Bottom-ARect.Top) * AGradient[i].endPercent + ARect.Top); | |
| 282 | + | AnRect.Top:=OldRect.Bottom; | |
| 283 | + | Point1:=PointF(AnRect.Left,AnRect.Top); | |
| 284 | + | Point2:=PointF(AnRect.Left,AnRect.Bottom); | |
| 285 | + | end | |
| 286 | + | else begin | |
| 287 | + | AnRect.Right:=Round((ARect.Right-ARect.Left) * AGradient[i].endPercent + ARect.Left); | |
| 288 | + | AnRect.Left:=OldRect.Right; | |
| 289 | + | Point1:=PointF(AnRect.Left,AnRect.Top); | |
| 290 | + | Point2:=PointF(AnRect.Right,AnRect.Top); | |
| 291 | + | end; | |
| 292 | + | Result.GradientFill(AnRect.Left,AnRect.Top,AnRect.Right,AnRect.Bottom, | |
| 293 | + | AGradient[i].StartColor,AGradient[i].StopColor,gtLinear,Point1,Point2,dmDrawWithTransparency,True,False); | |
| 294 | + | OldRect := AnRect; | |
| 295 | + | end; | |
| 296 | + | end; | |
| 297 | + | ||
| 298 | + | end. | |
| 299 | + | ``` | |
| 300 | + | ||
| 301 | + | ### Gebrauch | |
| 302 | + | ||
| 303 | + | If you use nGradientAlphaFill first add BGRABitmap and BGRABitmapTypes in the Uses section, then use the function: Wenn Sie 'nGradientAlphaFill' benutzen, fügen Sie zuerst 'BGRABitmap' und 'BGRABitmapTypes' in der Sektion Uses hinzu, dann wenden Sie die Funktion an: | |
| 304 | + | ||
| 305 | + | ``` pascal | |
| 306 | + | var | |
| 307 | + | myBitmap: TBGRABitmap; | |
| 308 | + | AGradInfo: array [0..1] of TnGradientInfo; | |
| 309 | + | begin | |
| 310 | + | AGradInfo[0].Direction:=gdVertical; | |
| 311 | + | AGradInfo[0].endPercent:=0.50; | |
| 312 | + | AGradInfo[0].StartColor:=BGRA(0,0,0,200); | |
| 313 | + | AGradInfo[0].StopColor:=BGRA(255,255,255,100); | |
| 314 | + | ||
| 315 | + | AGradInfo[1].Direction:=gdVertical; | |
| 316 | + | AGradInfo[1].endPercent:=1.00; | |
| 317 | + | AGradInfo[1].StartColor:=BGRA(0,0,0,100); | |
| 318 | + | AGradInfo[1].StopColor:=BGRA(255,255,255,50); | |
| 319 | + | ||
| 320 | + | myBitmap:= nGradientAlphaFill(Self.ClientRect,gdVertical,Agradinfo); | |
| 321 | + | Self.Canvas.Draw(0,0,myBitmap.Bitmap); | |
| 322 | + | myBitmap.Free; | |
| 323 | + | end; | |
| 324 | + | ``` | |
| 325 | + | ||
| 326 | + | ### Editor | |
| 327 | + | ||
| 328 | + | Der nGradient-Editor ist eine aktualisierte Version des 'Double Gradient Editor' mit zahlreichen Veränderungen und Verbesserungen, wie der Fähigkeit, Farbverläufe mit 'n-fachen' Gradienten zu erzeugen. | |
| 329 | + | ||
| 330 | + | Mit dem nGradient-Editor können Sie 'n-fache' Gradienten erzeugen. | |
| 331 | + | ||
| 332 | + | <figure> | |
| 333 | + | <img src="ngedit.png" title="ngedit.png" /> | |
| 334 | + | <figcaption>ngedit.png</figcaption> | |
| 335 | + | </figure> | |
| 336 | + | ||
| 337 | + | [nGradient Editor 1.1 (With alpha support) Source Code](http://www.multiupload.com/Z5CEFYE5CO) ngdedit1.1alpha.zip (22.58 KB) / [forum attach](http://lazarus.freepascal.org/index.php?action=dlattach;topic=12145.0;attach=1641) | |
| 338 | + | ||
| 339 | + | **Anmerkung:** Dieser Editor benutzt nicht BGRABitmap, sondern seine eigenen Alpha-Prozeduren. | |
| 340 | + | ||
| 341 | + | [nGradient Editor 1.1 Source Code](http://www.multiupload.com/SJDCG5P21Z) ngdedit1.1.zip (26.14 KB) / [forum attach](http://lazarus.freepascal.org/index.php?action=dlattach;topic=12145.0;attach=1636) | |
| 342 | + | ||
| 343 | + | --- | |
| 344 | + | *From the Free Pascal wiki, page "Double Gradient/de", as it stood on 2020-02-14 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).* |
