I am trying to make a drawing program in WPF but I ran into some problems.
I can succesfully draw lines (yeeey) but I also want the ability to fill out space (my method is stacking alot of recntagles with the same starting point).
but when I switch my radiobutton from "line" to "fill" it doesnt draw anything.
-- drawing (boolean) is used to create the starting point of filling
Code
private void cnvs_MouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed && linemode.IsChecked == true)
{
Line line = new Line();
drawing = true;
line.Stroke = currentbrush;
line.X1 = currentPoint.X - 9;
line.Y1 = currentPoint.Y - 9;
line.X2 = e.GetPosition(this).X - 9;
line.Y2 = e.GetPosition(this).Y - 9;
currentPoint = e.GetPosition(this);
cnvs.Children.Add(line);
} else if (cnvs.IsFocused == true)
{
if (!drawing) rectbeggining = e.GetPosition(this);
drawing = true;
Rectangle rect = new Rectangle();
rect.Stroke = currentbrush;
rect.StrokeThickness = 1;
rect.Height = (Math.Abs(e.GetPosition(this).Y) - Math.Abs(rectbeggining.Y));
rect.Width = (rectbeggining.X - e.GetPosition(this).X);
Canvas.SetLeft(rect, e.GetPosition(this).X);
Canvas.SetTop(rect, Math.Abs(e.GetPosition(this).Y));
cnvs.Children.Add(rect);
}
if(e.LeftButton == MouseButtonState.Released) drawing = false;
}
Xaml
<Grid>
<Border Name="CanvasBorder" BorderBrush="Black" BorderThickness="2" Margin="8,8,207,9"/>
<Canvas HorizontalAlignment="Left" Height="972" Margin="10,10,0,0" VerticalAlignment="Top" Width="1493" MouseDown="Canvas_MouseDown" MouseMove="cnvs_MouseMove" Name="cnvs">
<Canvas.Background>
<SolidColorBrush Color="White" Opacity="0"/>
</Canvas.Background>
</Canvas>
<ComboBox Name="selectcolor" Margin="1510,10,10,945" SelectedItem="Black" SelectionChanged="selectcolor_SelectionChanged" SelectedIndex="7">
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Rectangle Fill="{Binding Name}" Width="16" Height="16" Margin="0,2,5,2" />
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
<Button Content="Reset" HorizontalAlignment="Left" Margin="1510,939,0,0" VerticalAlignment="Top" Width="192" Click="Button_Click" Height="44"/>
<RadioButton GroupName="selectedMode" Name="linemode" Content="Line" HorizontalAlignment="Left" Margin="1510,232,0,0" VerticalAlignment="Top" IsChecked="True"/>
<RadioButton GroupName="selectedMode" Name="fillmode" Content="Fill" HorizontalAlignment="Left" Margin="1510,247,0,0" VerticalAlignment="Top"/>
<Label Content="Mode:" HorizontalAlignment="Left" Margin="1510,206,0,0" VerticalAlignment="Top"/>
</Grid>
I'm working on the map editor for generalstaff at the moment. You pick between line or area types of terrain, draw and when you finish a stroke it's processed.
Unless I've misunderstood your purpose that sounds pretty much like you're doing.
I essentially have an inkcanvas on top of a canvas.
It's rather more complicated than that. I bind viewmodels to an itemscontrol which has a canvas as it's itemspresenter and template data into the pieces of terrain.
I can bore at length on this stuff.
I use inkcanvas because it gives you smoother results than drawing directly on a canvas. I started off using a canvas like that but you get jiggly bits..
The strokeschanged event is used to tell when a stroke on the inkcanvas has finished.
Each stroke has a styluspointcollection StylusPoints and you can iterate through that to get the points.
Once you have the points, you can build a polygon.
I do that by templating and I bind the Points property of a Polygon to a Pointcollection from a viewmodel.
A polygon has a Fill property which you can set or bind to a solidcolorbrush.
And in that way you can draw any shape you like, then fill it with one colour.
Related
So I am creating a "Map Viewer" for a program I am working on. Basically I want to display a map and have it resize the image to fit in the grid. For this I am using Viewbox to hold the image and resize it. I was attempting to use this code to reveal the map but it does not center the circle on the mouse and it does not retain the revealed portions of the map (it ONLY reveals where the mouse is and not where it has been).
Here is the XAML:
<Viewbox x:Name="MapHolder" Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="1" Grid.RowSpan="7" Margin="25,5,25,15">
<Image x:Name="SelectedMap" Source="/wizard_dungeon.jpg" Stretch="Uniform" MouseMove="SelectedMap_MouseMove" >
<Image.OpacityMask>
<VisualBrush Stretch="None" >
<VisualBrush.Visual>
<Ellipse Width="400" Height="400" StrokeThickness="1" Fill="Black"/>
</VisualBrush.Visual>
<VisualBrush.RelativeTransform>
<TransformGroup>
<TranslateTransform x:Name="OpacityFilterTransform" X="1" Y="1"/>
</TransformGroup>
</VisualBrush.RelativeTransform>
</VisualBrush>
</Image.OpacityMask>
</Image>
</Viewbox>
And the code-behind:
private void SelectedMap_MouseMove(object sender, MouseEventArgs e)
{
var position = e.GetPosition(this);
var height = MapHolder.ActualHeight;
var width = MapHolder.ActualWidth;
// with the position values, interpolate a TranslateTransform for the opacity mask
var transX = position.X / width;
var transY = position.Y / height;
OpacityFilterTransform.X = transX - 0.5;
OpacityFilterTransform.Y = transY - 0.5;
}
I want there to basically be a Image under a Black screen and I can erase the black screen to reveal the image in the areas I have erased.
I currently have a WPF windows with a Canvas is 600 x 400. Is it possible to scale or automatically zoom in so that the lines take up as much as the 600x600 as possible?
<Border>
<Canvas x:Name="cMap" Width="600" Height="400">
<Line X1="5" Y1="5" X2 ="10" Y2="10" StrokeThickness="2" Stroke="Black"/>
<Line X1="10" Y1="10" X2 ="15" Y2="25" StrokeThickness="2" Stroke="Black"/>
</Canvas>
</Border>
My intention will be to add lines programmatically via code instead of XAML.
Thanks.
Not sure what is your exact usecase, but you could probably benefit by using ViewBox:
<Border>
<Viewbox Stretch="Uniform">
<Canvas x:Name="cMap" Width="15" Height="25">
<Canvas.LayoutTransform>
<ScaleTransform />
</Canvas.LayoutTransform>
<Line X1="5" Y1="5" X2 ="10" Y2="10" StrokeThickness="2" Stroke="Black"/>
<Line X1="10" Y1="10" X2 ="15" Y2="25" StrokeThickness="2" Stroke="Black"/>
</Canvas>
</Viewbox>
</Border>
Hope this helps you!
To draw lines in code you shoud do something like this:
Line line = new Line();
Thickness thickness = new Thickness(101,-11,362,250);
line.Margin = thickness;
line.Visibility = System.Windows.Visibility.Visible;
line.StrokeThickness = 4;
line.Stroke = System.Windows.Media.Brushes.Black;
line.X1 = 10;
line.X2 = 40;
line.Y1 = 70;
line.Y2 = 70;
and don't forget to add:
myCanvas.Children.Add(line);
to put those line in some place
from: Drawing lines in code using C# and WPF
To resize your canvas please read this:
Canvas is the only panel element that has no inherent layout
characteristics. A Canvas has default Height and Width properties of
zero, unless it is the child of an element that automatically sizes
its child elements. Child elements of a Canvas are never resized, they
are just positioned at their designated coordinates. This provides
flexibility for situations in which inherent sizing constraints or
alignment are not needed or wanted. For cases in which you want child
content to be automatically resized and aligned, it is usually best to
use a Grid element.
So as a solution you would make it inside a GRID or using the following code:
public class CanvasAutoSize : Canvas
{
protected override System.Windows.Size MeasureOverride(System.Windows.Size constraint)
{
base.MeasureOverride(constraint);
double width = base
.InternalChildren
.OfType<UIElement>()
.Max(i => i.DesiredSize.Width + (double)i.GetValue(Canvas.LeftProperty));
double height = base
.InternalChildren
.OfType<UIElement>()
.Max(i => i.DesiredSize.Height + (double)i.GetValue(Canvas.TopProperty));
return new Size(width, height);
}
}
at your XAML:
<local:CanvasAutoSize VerticalAlignment="Top" HorizontalAlignment="Left"></local:CanvasAutoSize>
from: WPF: How to make canvas auto-resize?
Here is my xaml
<Canvas x:Name="DesignArea">
<ContentControl
Name="DesignerItem"
Width="100"
Height="100"
Canvas.Top="100"
Canvas.Left="100"
Template="{StaticResource DesignerItemTemplate}">
<Ellipse Fill="Blue" IsHitTestVisible="False"/>
</ContentControl>
<ContentControl Width="130"
MinWidth="50"
Height="130"
MinHeight="50"
Canvas.Top="150"
Canvas.Left="150"
Template="{StaticResource DesignerItemTemplate}">
<Path Fill="Blue"
Data="M 0,5 5,0 10,5 5,10 Z"
Stretch="Fill"
IsHitTestVisible="False"/>
</ContentControl>
</Canvas>
As you can see that the content control use the template just fine with all of it functionality
But I want to do it through C# like this
ContentControl ct = new ContentControl();
ControlTemplate Temp;
Temp = (ControlTemplate)this.FindResource("DesignerItemTemplate");
ct.Template = Temp;
Ellipse ell = new Ellipse();
ell.Fill = new SolidColorBrush(Colors.Black);
ell.Width = 100;
ell.Height = 100;
ell.IsHitTestVisible = false;
ct.Content = ell;
DesignArea.Children.Add(ct);
The Black Ellipse in C# did show up the grid template like the xaml shape
But I can't move, drag drop, resize or rotate Like the content control in the canvas What happen?
Oh I see why
Turn out I need to set the properties of the Canvas too in order to make it work
Canvas.SetLeft(ct, 300);
Canvas.SetTop(ct, 300);
ct.Width = 100;
ct.Height = 100;
I have a wrap panel with images in it. I am using a pointing device and can get X and Y coordinates on screen. I would like to use the X and Y coordinates to select a particular item in the WrapPanel or List.
<WrapPanel HorizontalAlignment="Center" VerticalAlignment="Top" Grid.Row="1" Name="ImageWrap">
<ContentControl Style="{StaticResource imageContainerStyle}">
<Image Stretch="Uniform" Source="/Images/Texture01.jpg" />
</ContentControl>
<ContentControl Style="{StaticResource imageContainerStyle}">
<Image Stretch="Uniform" Source="/Images/Texture02.jpg" />
</ContentControl>
<ContentControl Style="{StaticResource imageContainerStyle}">
<Image Stretch="Uniform" Source="/Images/Texture03.jpg" />
</ContentControl>
</WrapPanel>
C# code which I am trying to use. But isn't working
Point mousePosition = new Point(xPosition, yPosition);
Point localPoint = this.ImageWrap.PointToScreen(mousePosition);
Please provide me with suggestions.
You may use the panel's InputHitTest method. It will return the element at the given position (in coordinates relative to the panel), or null, as long as you don't set the panel's Background property.
Point screenPosition = new Point(xPosition, yPosition);
Point panelPosition = ImageWrap.PointFromScreen(screenPosition); // not PointToScreen
IInputElement element = ImageWrap.InputHitTest(panelPosition);
if (element is Image)
{
...
}
I have an image control sits inside a Grid control. I already have a button to enable zoom-in to this image. After zoom-in, the Horizontal/vertical scroll bars are displayed. And then I rotate the image contained grid, the image and the grid scroll bar are messed up. How should I incorporate both zoom-in and rotate for the image control? The following are the code that I am using in my project.
The image control zoom-in code I used (x is the image control):
if ((x as Image) != null) { x.Height = x.Height * 1.3; x.Width = x.Width * 1.3; }
The rotation code I used (x is the image control):
if ((x as Image) != null)
{
RotateTransform rotate = new RotateTransform(); rotate.Angle = rotateAngle;
rotate.CenterX = x.Width / 2;
rotate.CenterY = x.Height / 2;
x.RenderTransform = rotate;
};
The XAML is:
<ScrollViewer x:Name="scrollViewer" Height="480" Width="615"
VerticalScrollBarVisibility="Auto"
HorizontalScrollBarVisibility="Auto">
<ScrollViewer.Content>
<Grid x:Name="ImageGrid">
<StackPanel x:Name="ImageStackPanel">
<Image Source="..." VerticalAlignment="Center" Width="220" Height="170" ></Image>
</StackPanel>
</Grid>
</ScrollViewer.Content>
</ScrollViewer>
Does anybody have any existing code snippet that I can borrow to resolve this trick?
I think you need to use TransformGroup to use more than one transform at the time:
ScaleTransform myScaleTransform = new ScaleTransform();
myScaleTransform.ScaleY = 3;
RotateTransform myRotateTransform = new RotateTransform();
myRotateTransform.Angle = 45;
// Create a TransformGroup to contain the transforms
// and add the transforms to it.
TransformGroup myTransformGroup = new TransformGroup();
myTransformGroup.Children.Add(myScaleTransform);
myTransformGroup.Children.Add(myRotateTransform);
// Associate the transforms to the image.
x.RenderTransform = myTransformGroup;
This may work for your needs:
<Image x:Name="image" Source="myImageSource" Stretch="Uniform"
HorizontalAlignment="Center" VerticalAlignment="Center"
RenderTransformOrigin="0.5, 0.5">
<Image.RenderTransform>
<TransformGroup>
<RotateTransform x:Name="Rotate"/>
<ScaleTransform x:Name="Scale" />
</TransformGroup>
</Image.RenderTransform>
</Image>
code behind:
Rotate.Angle = 45;
Scale = 0.25;
You may be missing the LayoutTransformer from the Silverlight Toolkit, and the AnimationMediator from one of the Toolkit developers.
With the LayoutTransformer you can set its content to anything, not just images, and apply any transformation with it, and as opposed to the usual RenderTransform, it will affect layout and actual sizes.
I have a similar scenario and I use it like this:
<Grid>
<fs:AnimationMediator x:Name="RotateMediator" LayoutTransformer="{Binding ElementName=LayoutTransformer}" AnimationValue="{Binding Angle, ElementName=RotateTransform, Mode=TwoWay}" />
<fs:AnimationMediator x:Name="ScaleXMediator" LayoutTransformer="{Binding ElementName=LayoutTransformer}" AnimationValue="{Binding ScaleX, ElementName=ScaleTransform, Mode=TwoWay}" />
<fs:AnimationMediator x:Name="ScaleYMediator" LayoutTransformer="{Binding ElementName=LayoutTransformer}" AnimationValue="{Binding ScaleY, ElementName=ScaleTransform, Mode=TwoWay}" />
<tkt:LayoutTransformer x:Name="LayoutTransformer" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<tkt:LayoutTransformer.LayoutTransform>
<TransformGroup>
<RotateTransform x:Name="RotateTransform" />
<ScaleTransform x:Name="ScaleTransform" />
</TransformGroup>
</tkt:LayoutTransformer.LayoutTransform>
<Image x:Name="MyImage" Source="mysource.png" Width="600" Height="800" />
</tkt:LayoutTransformer>
</Grid>
Because of the lack of MultiBinding you'd probably additionally have to manually handle the input value (from Slider controls etc) changed events and then set the AnimationValues of RotateMediator etc accordingly.