学习Halcon的HSmartWindowControl窗口控件,用WPF和Opencv仿照了一个。
显示控件的主体是两个Canvas: Root Canvas是背景,刷上了网格; 把要显示的图像作为Image Canvas的图像背景,
后面图像的移动,缩放,实质都是Image Canvas。
可交互,学习的是Halcon的绘图对象,WPF的Path来实现的,Path类有鼠标事件,当Mouse Enter时,绘图对象的线宽增加,离开减少。
protected virtual void _path_MouseMove(object sender, MouseEventArgs e) { }
protected virtual void _path_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
_path.Stroke = new SolidColorBrush(_cLineColor);
mbIsSelected = false;
(sender as Path).ReleaseMouseCapture();
}
protected virtual void _path_MouseLeftButtonDown(object sender, MouseButtonEventArgs e){ }
protected virtual void _path_MouseLeave(object sender, MouseEventArgs e)
{
_dLineWidth -= 3;
}
protected virtual void _path_MouseEnter(object sender, MouseEventArgs e)
{
_dLineWidth += 3;
}
protected virtual void UpdateDrawObjectScaleToImageChange() { }
主要实现了四个绘图对象,其中Rect2DrawingObejct,用的时Opencv的RotateRect来算的坐标(自己算太麻烦了),后期其实还可以实现多边形的绘图对象。
至于绘图对象的回调函数,用委托实现:
public delegate void DrawingObjectCallback(string drawingObjectType, DrawingObject drawingObject);
protected DrawingObjectCallback OnDrag;
protected DrawingObjectCallback OnResize;
protected DrawingObjectCallback OnSelect;
至此,整体功能就实现了。
但是还有一个问题,就是Image Canvas控件坐标和图像坐标的转换,其实两个坐标系的转换Factor也很好算:
mdScaleXToImage = mMat.Cols / (value * 1.0);
mdScaleYToImage = mMat.Rows / (value * 1.0);
但是当Image Canvas控件的尺寸发生改变(例如,窗口最大化了)时,这两个Factor就也必须更新,对于控件本身来讲,这两个值的更新是很容易的,可以在private void imageCanvas_SizeChanged(object sender, SizeChangedEventArgs e)
更新。但在绘图图像类中就比较麻烦,目前的做法是绘图图像类注册了依赖属性,绑定到窗口相应的属性上,然后在依赖属性的回调函数中去更新绘图对象的位置文章来源:https://www.toymoban.com/news/detail-407486.html
internal static readonly DependencyProperty ScaleXToImageProperty =
DependencyProperty.Register("ScaleXToImage", typeof(double), typeof(DrawingObject), new PropertyMetadata(1.0, OnScaleToImageChanged));
internal static readonly DependencyProperty ScaleYToImageProperty =
DependencyProperty.Register("ScaleYToImage", typeof(double), typeof(DrawingObject), new PropertyMetadata(1.0, OnScaleToImageChanged));
private static void OnScaleToImageChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DrawingObject obj = d as DrawingObject;
if (obj is Rect1DrawingObject)
{
(obj as Rect1DrawingObject).UpdateDrawObjectScaleToImageChange();
}
else if(obj is CircleDrawingObject)
{
(obj as CircleDrawingObject).UpdateDrawObjectScaleToImageChange();
}
else if(obj is LineDrawingObject)
{
(obj as LineDrawingObject).UpdateDrawObjectScaleToImageChange();
}
else if(obj is Rect2DrawingObject)
{
(obj as Rect2DrawingObject).UpdateDrawObjectScaleToImageChange();
}
}
附上demo的效果,也是参考的Halcon&WPF的例程,在Rect1Object的OnDrag回调函数中执行Sobel元素。
文章来源地址https://www.toymoban.com/news/detail-407486.html
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