元素在大画布上消失 [英] Elements disappearing on large Canvas

问题描述

大家好，

我有一个可以水平滚动的大画布.我的画布包含均匀分布的少量线条(StrokeThickness = 1).当我向右滚动时，线条开始消失，并在达到8.000.000(或更高或更低)的水平偏移时出现.我该如何解决?

这里举个例子.左边10行，右边10行.前几行是可见的，而后几行是部分可见的(5可见，5不可见).

Hi all,

I have a large Canvas which can be scrolled horizontally. My Canvas contains little lines (StrokeThickness = 1) positioned uniformly. When I scroll to right the lines start to disappear and appear when reaching an horizontal offset of 8.000.000 (more or less). How can I fix it?

Here an example. 10 lines to left, 10 lines to right. The first lines are visible while the last ones are partially visible (5 visible, 5 not).

<Window x:Class="WpfApplication.Window1"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    Title="Window1" Height="300" Width="300">
    <Grid>
        <ScrollViewer HorizontalScrollBarVisibility="Visible">
            <Canvas Width="15000000">
                <Line Canvas.Left="0" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="5" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="10" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="15" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="20" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="25" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="30" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="35" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="40" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="45" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999950" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999955" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999960" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999965" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999970" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999975" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999980" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999985" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999990" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
                <Line Canvas.Left="14999995" X1="0" X2="0" Y1="0" Y2="100" Stroke="Black" StrokeThickness="1" />
            </Canvas>
        </ScrollViewer>
    </Grid>
</Window>

谢谢，

Raúl

Thanks,

Raúl

推荐答案

我不会使用仅宽阔的画布，而是只绘制可见的东西.您只是想在尝试以这种方式进行操作时遇到麻烦.由于监视器的宽度通常不超过2000像素，因此制作15,000,000像素的图像毫无意义.

Instead of using a canvas that''s THAT frickin'' wide, I''d be owner drawing only what''s visible. You''re just asking for trouble trying to do it this way. Since a monitor normally isn''t any wider than about 2000 pixels, there''s no point in making an image that''s 15,000,000 pixels wide.

在此页面中 http://connect.microsoft.com/VisualStudio/feedback/details/731467/disappearing-path-wp [^ ]您可以找到线条消失的原因. 我遇到了同样的问题，然后我按照长度的函数将线分开了

In this page http://connect.microsoft.com/VisualStudio/feedback/details/731467/disappearing-path-wp[^] you can find the reason of why the lines disappear.
I had the same problem, then i split the lines in function of its length

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