70002758 How to always show hatches of certain objects independ the ShowHatches property value

Summary

How to always show hatches of certain objects independ the vdDocument.GlobalRenderProperties.ShowHatches property value

Solution

Try a code like below:

      
//suppose you have add a vdFramedControl into a Form
     
        private vdDocument doc { get { return vdFramedControl.BaseControl.ActiveDocument; } }
        private void Form1_Load(object sender, EventArgs e)
        {
            doc.GlobalRenderProperties.ShowHatches = false;//initial set ShowHatches to false;
            doc.FreezeEntityDrawEvents.Push(false);
            doc.OnDrawFigure += Doc_OnDrawFigure;
            doc.OnDrawAfterFigure += Doc_OnDrawAfterFigure;

            doc.OnAfterNewDocument += new vdDocument.AfterNewDocument(doc_OnAfterNewDocument);
            doc.OnAfterOpenDocument += new vdDocument.AfterOpenDocument(doc_OnAfterOpenDocument);
        }
        void doc_OnAfterOpenDocument(object sender)
        {
            vdDocument mdoc = sender as vdDocument;
            mdoc.GlobalRenderProperties.ShowHatches = false;

        }
        void doc_OnAfterNewDocument(object sender)
        {
            vdDocument mdoc = sender as vdDocument;
            mdoc.GlobalRenderProperties.ShowHatches = false;

        }
        
        //returns true is the passed figure need to ignore the ShowHatches and always be hatched
        private bool IsForceHatchedFigure(vdFigure fig)
        {
            //quick filter out unnecessary objects to check
            IvdHatchFigure hfig = fig as IvdHatchFigure;
            if (hfig == null || hfig.HatchProperties == null || hfig.HatchProperties.FillMode == VdConstFill.VdFillModeNone) return false;
            //filter what vdfigure you want to be hatched
            //for example only vdCircle hatched will be shown.Other hatched figures will be shown depend the doc.GlobalRenderProperties.ShowHatches 
            if (fig is vdCircle)
            {
                return true;
            }
            return false;
        }
        private void Doc_OnDrawFigure(object sender, vdRender render, ref bool cancel)
        {
            bool ishatched = IsForceHatchedFigure(sender as vdFigure);
            if (ishatched) doc.GlobalRenderProperties.ShowHatches = true;

        }

        private void Doc_OnDrawAfterFigure(object sender, vdRender render)
        {
            bool ishatched = IsForceHatchedFigure(sender as vdFigure);
            if (ishatched) doc.GlobalRenderProperties.ShowHatches = false;
        }

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