[WPF] Some paths was disappeared when scale canvas

Question

[WPF] Some paths was disappeared when scale canvas

Trần Bảo Dũng 1

When I add many Paths on canvas and zoom out canvas, some paths was disappeared.

I execute on Window 10, 64 bit and .Net 4.7

Please let me know, why some paths was disappeared and solution for this issue.

Thank you so much!

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Answer 1

Alex Li-MSFT 1,096

Hi,

Welcome to our Microsoft Q&A platform!

You can add a Viewbox to the outermost layer of the Canvas.

<Viewbox>
            <Canvas Width="400" Height="200" Name="canva">
                ...
            </Canvas>
        </Viewbox>

Thanks.

Trần Bảo Dũng 1

Dear AlexLi-MSFT

Thank for your answer, but it isn't good in my case.

Code add rectangle into canvas below:

p = new Path();

p.Stroke = Brushes.Black;

p.Fill = Brushes.Transparent;

 RectangleGeometry rectangleGeometry = new RectangleGeometry(new Rect(20, 20, 200, 20));

 p.Data = rectangleGeometry;

 p.StrokeThickness = 0.13;

Alex Li-MSFT 1,096 Reputation points

2020-03-31T06:35:00.617+00:00

You can fix your code p.StrokeThickness = 1,then test your code.
Trần Bảo Dũng 1 Reputation point

2020-03-31T06:39:42.293+00:00

p.StrokeThickness = 1 is worked, but I don't want to change StrokeThickness so much.

Please let me know, the minimum value StrokeThickness when scale canvas.
Alex Li-MSFT 1,096 Reputation points

2020-04-07T08:40:31.047+00:00

Set p.StrokeThickness relative to Canvas scaling.path.StrokeThickness = 1.0 / scale;

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[WPF] Some paths was disappeared when scale canvas

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