ImageAreaBaseOwnerDraw Property
This is used to turn owner draw mode on and off
Namespace: EWSoftware.ImageMaps.Windows.FormsAssembly: EWSoftware.ImageMaps.Windows.Forms (in EWSoftware.ImageMaps.Windows.Forms.dll) Version: 2023.1.3.0
public bool OwnerDraw { get; set; }
Public Property OwnerDraw As Boolean
Get
Set
public:
property bool OwnerDraw {
bool get ();
void set (bool value);
}
member OwnerDraw : bool with get, set
Property Value
BooleanWhen true, the control will fire the
DrawImage event to allow you to draw the
image map and the individual image areas. Note that image areas can still be set to owner drawn even
if the image map is not.
This is an example of an owner drawn image area event handler. For some other examples, see the demo
application. As shown, the image area event properties are not accessible in the designer so you must write
code to connect the event handlers. For example, add the code in the form's constructor after the call to
InitializeComponent.
public ImageMapEventsForm()
{
InitializeComponent();
// Hook up the event handlers. Since they are not accessible in the
// designer, we must do it manually.
ImageAreaBase a = (ImageAreaBase)imMap.Areas[4];
a.DrawImage += Button_DrawImage;
a = (ImageAreaBase)imMap.Areas[5];
a.DrawImage += Button_DrawImage;
a = (ImageAreaBase)imMap.Areas[6];
a.DrawImage += Button_DrawImage;
.
.
.
}
/// <summary>
/// Draw the "button" image areas
/// </summary>
/// <param name="sender">The sender of the event (the image area)</param>
/// <param name="e">The event arguments</param>
private void Button_DrawImage(object sender, DrawImageEventArgs e)
{
ImageAttributes ia;
Graphics g = e.Graphics;
// All are ellipse image areas
ImageAreaEllipse a = (ImageAreaEllipse)sender;
Rectangle r = a.Ellipse;
// Offset the area rectangle by the draw event offset
r.Offset(e.ImageOffset.X, e.ImageOffset.Y);
if(!a.Enabled)
ia = iaDisabled;
else
ia = iaNormal;
using(TextureBrush tb = new TextureBrush(imgFiller,
new Rectangle(0, 0, imgFiller.Width, imgFiller.Height), ia))
{
tb.WrapMode = WrapMode.Tile;
// Translate the brush coordinates to account for the offset
using(Matrix m = new Matrix())
{
m.Translate(r.X, r.Y);
tb.Transform = m;
// If the area is focused or hot lighted, give it a glow effect
if(e.DrawState == DrawState.Focus || e.DrawState == DrawState.HotLight)
{
using(GraphicsPath pth = new GraphicsPath())
{
pth.AddEllipse(r);
using(PathGradientBrush pgb = new PathGradientBrush(pth))
{
pgb.CenterColor = Color.LightSteelBlue;
if(e.DrawState == DrawState.Focus)
pgb.SurroundColors = new Color[] { Color.Yellow };
else
pgb.SurroundColors = new Color[] { Color.Blue };
pgb.FocusScales = new PointF(0.8f, 0.8f);
g.FillEllipse(pgb, r);
}
}
}
// Draw the filler
g.FillEllipse(tb, r);
g.DrawString((string)a.Tag, buttonFont, Brushes.Black, r, sfFormat);
}
}
}
Public Sub New()
MyBase.New()
InitializeComponent()
' Hook up the event handlers. Since they are not accessible in the
' designer, we must do it manually.
Dim a As ImageAreaBase = DirectCast(imMap.Areas(4), ImageAreaBase)
AddHandler a.DrawImage, AddressOf Button_DrawImage
a = DirectCast(imMap.Areas(5), ImageAreaBase)
AddHandler a.DrawImage, AddressOf Button_DrawImage
a = DirectCast(imMap.Areas(6), ImageAreaBase)
AddHandler a.DrawImage, AddressOf Button_DrawImage
.
.
.
End Sub
''' <summary>
''' Draw the "button" image areas
''' </summary>
''' <param name="sender">The sender of the event (the image area)</param>
''' <param name="e">The event arguments</param>
Private Sub Button_DrawImage(sender As Object, e As DrawImageEventArgs)
Dim ia As ImageAttributes
Dim g As Graphics = e.Graphics
' All are ellipse image areas
Dim a As ImageAreaEllipse = DirectCast(sender, ImageAreaEllipse)
Dim r As Rectangle = a.Ellipse
' Offset the area rectangle by the draw event offset
r.Offset(e.ImageOffset.X, e.ImageOffset.Y)
If Not a.Enabled Then
ia = iaDisabled
Else
ia = iaNormal
End If
Using tb As New TextureBrush(imgFiller, _
New Rectangle(0, 0, imgFiller.Width, imgFiller.Height), ia)
tb.WrapMode = WrapMode.Tile
' Translate the brush coordinates to account for the offset
Using m As New Matrix()
m.Translate(CType(r.X, Single), CType(r.Y, Single))
tb.Transform = m
' If the area is focused or hot lighted, give it a glow effect
If e.DrawState = DrawState.Focus Or e.DrawState = DrawState.HotLight Then
Using pth As New GraphicsPath()
pth.AddEllipse(r)
Using pgb As New PathGradientBrush(pth)
pgb.CenterColor = Color.LightSteelBlue
If e.DrawState = DrawState.Focus Then
pgb.SurroundColors = New Color() { Color.Yellow }
Else
pgb.SurroundColors = New Color() { Color.Blue }
End If
pgb.FocusScales = New PointF(0.8!, 0.8!)
g.FillEllipse(pgb, r)
End Using
End Using
End If
' Draw the filler
g.FillEllipse(tb, r)
g.DrawString(DirectCast(a.Tag, String), buttonFont, Brushes.Black, _
New RectangleF(CType(r.X, Single), CType(r.Y, Single), _
CType(r.Width, Single), CType(r.Height, Single)), sfFormat)
End Using
End Using
End Sub
No code example is currently available or this language may not be supported.
No code example is currently available or this language may not be supported.