Sample Graphics

Graphics Gallery

This gallery is to show the designs can be created from Lazarus and drawing tools, like BGRABitmap.

gdgfx

Name: gdgfx 'Gradient Graphics'

Author: Lainz

Description: Shows how to create buttons and gradients with and without transparency in Lazarus using BGRABitmap and an enhanced version of Double Gradient that supports alpha.

Notes: Tested on Win32. Download Includes used version of BGRABitmap & DoubleGradient. Tested on Linux with Kubuntu and Qt, work fine

Win32:

Kubuntu 10.04 with Qt:

Top-Left: 'like flash player setup button' / Top-Right: 'like win7 explorer toolbar' / Bottom: double gradient with alpha / Background: same as bottom.

Download: gdgfx.7z (60.01 KB)

Flash Player Button

Add a new TPaintBox, set 'btn1' as name. Go OnPaint event and add this code:

<delphi>var

 tempbmp1, tempbmp2: TBGRABitmap;

begin

 // Background Gradient
 tempbmp1:=TBGRABitmap.Create(btn1.Width,btn1.Height,BGRA(104,104,104,255));
 tempbmp1.Canvas.GradientFill(Rect(1,Round(btn1.Height*0.25),btn1.Width-1,btn1.Height-1),$686868,$404040,gdVertical);

 // Frame Border
 tempbmp1.Canvas.Brush.Color:=$181818;
 tempbmp1.Canvas.FrameRect(btn1.ClientRect);

 // Light Gradient
 tempbmp2:=TBGRABitmap.Create(btn1.Width,btn1.Height,BGRA(0,0,0,0));
 tempbmp2.GradientFill(1,1,btn1.Width-1,btn1.Height-1,
 BGRA(255,255,255,34),
 BGRA(255,255,255,10), gtLinear,
 PointF(btn1.ClientRect.Right,btn1.ClientRect.Top),
 PointF(btn1.ClientRect.Right,btn1.ClientRect.Bottom),
 dmDrawWithTransparency,True,False);
 tempbmp2.AlphaFillRect(2,2,btn1.Width-2,btn1.Height-2,0);

 // Merge Bitmaps
 tempbmp1.Canvas.Draw(0,0,tempbmp2.Bitmap);

 // Paint in Canvas
 btn1.Canvas.Draw(0,0,tempbmp1.Bitmap);

 // Free Bitmaps
 tempbmp1.Free;
 tempbmp2.Free;

end;</delphi>

Windows 7 Explorer Toolbar

Add a new TPaintBox, set 'btn2' as name. Go OnPaint event and add this code:

<delphi>var

 backBmp, lightBmp: TBGRABitmap;
 gradBmp: TBitmap;

begin

 // Background Gradient
 gradBmp := DoubleGradientFill(
             btn2.ClientRect,
             $FFFAF5,$FAF0E6,
             $F4E6DC,$F7E9DD,
             gdVertical,gdVertical,gdVertical,0.5);

 // Use as background
 backBmp := TBGRABitmap.Create(gradBmp);
 gradBmp.Free;

 // Light Gradient
 lightBmp:= TBGRABitmap.Create(btn2.Width,btn2.Height,BGRA(0,0,0,0));
 lightBmp.Rectangle(0,0,btn2.Width,btn2.Height-2,
    BGRA(255,255,255,100),
    dmSet);
 lightBmp.SetHorizLine(0,btn2.Height-1,btn2.Width-1,BGRA(160,175,195,255));
 lightBmp.SetHorizLine(0,btn2.Height-2,btn2.Width-1,BGRA(205,218,234,255));

 // Merge Bitmaps
 backBmp.PutImage(0,0,lightBmp,dmDrawWithTransparency);
 lightBmp.Free;

 // Paint in Canvas
 backBmp.Draw(btn2.Canvas,0,0,True);
 backBmp.Free;

end;</delphi>

Double Gradient with Alpha

Add a new TPaintBox, set 'btn3' as name. Go OnPaint event and add this code:

<delphi>var

 myBitmap: TBGRABitmap;

begin

 myBitmap:= DoubleGradientAlphaFill(
 btn3.ClientRect,
 BGRA(0,0,0,100),BGRA(255,255,255,100),
 BGRA(100,100,100,100),BGRA(150,150,150,100),
 gdVertical,gdVertical,gdVertical,0.5);
 btn3.Canvas.Draw(0,0,myBitmap.Bitmap);
 myBitmap.Free;

end;</delphi>

Progress Bars

A progress bar is a component in a graphical user interface used to convey the progress of a task, such as a download or file transfer.

Flash Player Progress Bar

'Like flash player setup progress bar'. Requires BGRABitmap and Double Gradient with Alpha.

Notes: Tested on Win32, Kubuntu 10.04 with GTK and Qt.

Add a new TPaintBox, set 'progressbar' as name. Go OnPaint event and add this code:

<delphi>var

 ABitmap, ABitmap2: TBGRABitmap; ARect: TRect;

begin

 // Initialization
 // Self.Color:=$004D4D4D;
 ABitmap:=TBGRABitmap.Create(progressbar.Width,progressbar.Height);
 ARect:=progressbar.ClientRect;

 // Percent of Progress
 ARect.Right:=Round(ABitmap.Width*0.75);

 // Background Gradient
 ABitmap.Canvas.GradientFill(progressbar.ClientRect,$303030,$323232,gdVertical);

 // Background Border
 ABitmap.Rectangle(0,0,ABitmap.Width,ABitmap.Height,BGRA(28,28,28,255),dmSet);

 // Progress Gradient
 ABitmap2:=DoubleGradientAlphaFill(
 ARect,
 BGRA(102,163,226,255),BGRA(83,135,186,255),
 BGRA(75,121,175,255),BGRA(56,93,135,255),
 gdVertical,gdVertical,gdVertical,0.5);

 // Progress Border
 ABitmap2.Rectangle(0,0,ARect.Right,ARect.Bottom,BGRA(28,28,28,255),dmSet);

 // Progress Light
 ABitmap2.Rectangle(1,1,ARect.Right-1,ARect.Bottom-1,BGRA(153,212,255,100),dmDrawWithTransparency);

 // Merge Bitmaps
 ABitmap.Canvas.Draw(0,0,ABitmap2.Bitmap);

 // Draw Bitmap
 progressbar.Canvas.Draw(0,0,ABitmap.Bitmap);

 // Free Bitmap
 ABitmap.Free;
 ABitmap2.Free;

end;</delphi>

You can change the 'Percent' of progress changing this line:

<delphi> // Percent of Progress - 33%

 ARect.Right:=Round(ABitmap.Width*0.33);

 // Percent of Progress - 90%
 ARect.Right:=Round(ABitmap.Width*0.90);</delphi>