學(xué)習(xí)Halcon的HSmartWindowControl窗口控件，用WPF和Opencv仿照了一個(gè)。
顯示控件的主體是兩個(gè)Canvas: Root Canvas是背景，刷上了網(wǎng)格； 把要顯示的圖像作為Image Canvas的圖像背景，
后面圖像的移動(dòng)，縮放，實(shí)質(zhì)都是Image Canvas。
可交互，學(xué)習(xí)的是Halcon的繪圖對(duì)象，WPF的Path來實(shí)現(xiàn)的，Path類有鼠標(biāo)事件，當(dāng)Mouse Enter時(shí)，繪圖對(duì)象的線寬增加，離開減少。
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() { }
主要實(shí)現(xiàn)了四個(gè)繪圖對(duì)象，其中Rect2DrawingObejct，用的時(shí)Opencv的RotateRect來算的坐標(biāo)（自己算太麻煩了），后期其實(shí)還可以實(shí)現(xiàn)多邊形的繪圖對(duì)象。
至于繪圖對(duì)象的回調(diào)函數(shù)，用委托實(shí)現(xiàn)：
public delegate void DrawingObjectCallback(string drawingObjectType, DrawingObject drawingObject);
protected DrawingObjectCallback OnDrag;
protected DrawingObjectCallback OnResize;
protected DrawingObjectCallback OnSelect;
至此，整體功能就實(shí)現(xiàn)了。
但是還有一個(gè)問題，就是Image Canvas控件坐標(biāo)和圖像坐標(biāo)的轉(zhuǎn)換，其實(shí)兩個(gè)坐標(biāo)系的轉(zhuǎn)換Factor也很好算：
mdScaleXToImage = mMat.Cols / (value * 1.0);
mdScaleYToImage = mMat.Rows / (value * 1.0);
但是當(dāng)Image Canvas控件的尺寸發(fā)生改變（例如，窗口最大化了）時(shí)，這兩個(gè)Factor就也必須更新，對(duì)于控件本身來講，這兩個(gè)值的更新是很容易的，可以在private void imageCanvas_SizeChanged(object sender, SizeChangedEventArgs e)更新。但在繪圖圖像類中就比較麻煩，目前的做法是繪圖圖像類注冊(cè)了依賴屬性，綁定到窗口相應(yīng)的屬性上，然后在依賴屬性的回調(diào)函數(shù)中去更新繪圖對(duì)象的位置文章來源：http://www.zghlxwxcb.cn/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，也是參考的Halcon&WPF的例程，在Rect1Object的OnDrag回調(diào)函數(shù)中執(zhí)行Sobel元素。
文章來源地址http://www.zghlxwxcb.cn/news/detail-407486.html
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