C＃中的图表垂直文本注释 [英] c# chart vertical text annotation

问题描述

我添加注释到C＃线图。我想改变文字的方向，但不能看到任何设置，让这一点。

I'm adding annotations to a c# line chart. I'd like to change the text orientation but can't see any setting to allow this.

RectangleAnnotationannotation = new RectangleAnnotation();
annotation.AnchorDataPoint = chart1.Series[0].Points[x];
annotation.Text = "look an annotation";
annotation.ForeColor = Color.Black;
annotation.Font = new Font("Arial", 12); ;
annotation.LineWidth = 2;
chart1.Annotations.Add(annotation);

注释正确添加到图形和矩形和文字从左到右。我想定向它跑上跑下。如何实现这一目标？

The annotation is added to the graph correctly and the rectangle and text run left to right. I want to orientate it to run up and down. Any suggestions on how to achieve this?

推荐答案

您不能旋转使用注释库的注解。你必须使用 postpaint 或预制。 这里是一个很好的例子如何使用油漆后事件。希望这可以帮助。我会包括以下链接的代码：

You cannot rotate annotations using the annotation library. You have to use postpaint or prepaint. Here is a good example of how to use the post-paint event. Hope this helps. I'll include the code from the link below:

protected void Chart1_PostPaint(object sender, ChartPaintEventArgs e)
{
if (e.ChartElement is Chart)
{
    // create text to draw
    String TextToDraw;
    TextToDraw = "Printed: " + DateTime.Now.ToString("MMM d, yyyy @ h:mm tt");
    TextToDraw += " -- Copyright © Steve Wellens";

    // get graphics tools
    Graphics g = e.ChartGraphics.Graphics;
    Font DrawFont = System.Drawing.SystemFonts.CaptionFont;
    Brush DrawBrush = Brushes.Black;

    // see how big the text will be
    int TxtWidth = (int)g.MeasureString(TextToDraw, DrawFont).Width;
    int TxtHeight = (int)g.MeasureString(TextToDraw, DrawFont).Height;

    // where to draw
    int x = 5;  // a few pixels from the left border

    int y = (int)e.Chart.Height.Value;
    y = y - TxtHeight - 5; // a few pixels off the bottom

    // draw the string        
    g.DrawString(TextToDraw, DrawFont, DrawBrush, x, y);
}

}

}

编辑：我刚刚意识到这个例子实际上不旋转文本。我知道你要使用这个工具，所以我将尽力找到使用postpaint的旋转文本为例

I just realized this example doesn't actually rotate the text. I know you have to use this tool so I will try to find an example using postpaint that rotates text.

编辑2：啊哈。右这里在SO。基本上你需要使用 e.Graphics.RotateTransform（270）; 属性（该行会旋转270度）

EDIT 2: Aaah. Right here at SO. Basically you need to use the e.Graphics.RotateTransform(270); property (that line would rotate 270 degrees).

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