[英]How can I make an image collage from several imported images, using WPF in C#?
I need to import multiple images, and manipulated them in one image, like a collage. 我需要导入多张图像,并在一张图像中对其进行操作,例如拼贴。 I just need simple tools like translating an image, rotating it, ect.
我只需要简单的工具,例如平移图像,旋转图像等。
Im in the process of learning mvvm, most of the view is done. 在学习mvvm的过程中,大部分视图已完成。 I dont know how I can add the imported images to one canvas.
我不知道如何将导入的图像添加到一个画布。 Is there some sort of built in image class that I can use?
我可以使用某种内置的图像类吗? Or some library that I can start from?
还是我可以开始的一些图书馆?
Right now I am able to import the images to a list. 现在,我可以将图像导入列表了。 My goal is to be able to add the selected image onto the canvas, and manipulate that image on the canvas, then export/save the image.
我的目标是能够将选定的图像添加到画布上,并在画布上处理该图像,然后导出/保存该图像。
however what you are looking is too broad to answer but here is a small sample 但是,您要查找的内容过于宽泛,无法回答,但这是一个小样本
xaml a
<Canvas x:Name="canvas" MouseDown="canvas_MouseDown" Background="Transparent"/>
code behind 背后的代码
private void canvas_MouseDown(object sender, MouseButtonEventArgs e)
{
Random rand = new Random(DateTime.Now.Millisecond);
var uriSource = new Uri(@"desert.jpg", UriKind.Relative);
for (int i = 0; i < 10; i++)
{
Image img = new Image();
img.Width = rand.NextDouble() * 200;
img.Height = rand.NextDouble() * 200;
img.Stretch= Stretch.UniformToFill;
img.Source = new BitmapImage(uriSource);
img.RenderTransform = new RotateTransform(rand.NextDouble() * 360);
Canvas.SetLeft(img, (rand.NextDouble() * canvas.ActualWidth));
Canvas.SetTop(img, (rand.NextDouble() * canvas.ActualHeight));
canvas.Children.Add(img);
}
}
result 结果
above could also be done in a MVVM way, let me know if you look forward to see that too. 以上也可以通过MVVM方式完成,如果您也希望看到这一点,请告诉我。
MVVM approach MVVM方法
here is a replication of the above code via MVVM 这是通过MVVM复制上面的代码
xaml a
<Grid>
<Grid.Resources>
<l:ViewModel x:Key="viewModel" />
<l:ImageLocationConverter x:Key="ImageLocationConverter" />
<Style TargetType="ContentPresenter">
<Setter Property="Canvas.Left">
<Setter.Value>
<MultiBinding Converter="{StaticResource ImageLocationConverter}">
<Binding Path="Left" />
<Binding Path="ActualWidth"
RelativeSource="{RelativeSource FindAncestor,AncestorType=Canvas}" />
</MultiBinding>
</Setter.Value>
</Setter>
<Setter Property="Canvas.Top">
<Setter.Value>
<MultiBinding Converter="{StaticResource ImageLocationConverter}">
<Binding Path="Top" />
<Binding Path="ActualHeight"
RelativeSource="{RelativeSource FindAncestor,AncestorType=Canvas}" />
</MultiBinding>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<ItemsControl ItemsSource="{Binding Images,Source={StaticResource viewModel}}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Canvas />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Border BorderBrush="White"
BorderThickness="5">
<Image Source="{Binding Image}"
Width="{Binding Width}"
Height="{Binding Height}"
Stretch="UniformToFill">
</Image>
<Border.RenderTransform>
<RotateTransform Angle="{Binding Angle}" />
</Border.RenderTransform>
</Border>
<Grid.Effect>
<DropShadowEffect Opacity=".5"
BlurRadius="10" />
</Grid.Effect>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
I have enhanced the view by adding more details to the template 我通过向模板添加更多详细信息来增强了视图
Viewmodel, model & converters classes 视图模型,模型和转换器类
namespace CSharpWPF
{
class ViewModel : DependencyObject
{
public ViewModel()
{
Images = new ObservableCollection<CollageImage>();
GenerateCollage();
}
public ObservableCollection<CollageImage> Images { get; private set; }
public void GenerateCollage()
{
Random rand = new Random(DateTime.Now.Millisecond);
var uriSource = new Uri(@"desert.jpg", UriKind.Relative);
for (int i = 0; i < 10; i++)
{
CollageImage img = new CollageImage();
img.Left = (0.2 + rand.NextDouble()) % 0.8;
img.Top = (0.2 + rand.NextDouble()) % 0.8;
img.Width = 100 + rand.NextDouble() * 100;
img.Height = 100 + rand.NextDouble() * 100;
img.Image = "desert.jpg";
img.Angle = rand.NextDouble() * 360;
Images.Add(img);
}
}
}
class CollageImage
{
public string Image { get; set; }
public double Left { get; set; }
public double Top { get; set; }
public double Width { get; set; }
public double Height { get; set; }
public double Angle { get; set; }
}
class ImageLocationConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
double value = (double)values[0];
double max = (double)values[1];
return value * max;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
result 结果
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