设置Canvas.LineTo的线端样式

问题描述

是否可以为TCanvas.LineTo方法的行尾设置样式？似乎默认为圆角，当Pen.Width设置为较大的值（例如9）时，对于连续几行不同颜色的行来说，这看起来非常糟糕。

>看起来像这样（圆角）：

  ******** ........ ****** 
 ********** ........ ****** 
 ********** .. ...... ****** 
 ******** ........ ****** 
  

（其中*为蓝色，。为黄色）

外线在中线之后绘制：

  ******** .. * ***** 
 ********** ...... ******** 
 ********** ... ... ******** 
 ******** ........ ****** 
  

我希望它看起来像这样（长度结尾）：

  ******** ........ ****** 
 ******** .. **** ** 
 ******** ........ ****** 
 ******** .. ** **** 
  

笔似乎没有为此提供任何设置，LineTo方法也没有提供任何设置。

解决方案

也许帮助。检查 PS_ENDCAP _ * 和 PS_JOIN _ * 标志。

Is there any way to set the style for the lineends for the TCanvas.LineTo method? It seems to default to rounded ends, which looks very bad for several lines in a row of different colours when Pen.Width is set to a large value (e.g. 9).

It looks like this (rounded ends):

 ********........******
**********........******
**********........******
 ********........******

(where * is e.g. blue and . is yellow)

It is even worse if the two outer lines are drawn after the middle line:

 ********........******
**********......********
**********......********
 ********........******

I'd like it to look like this (streight ends):

 ********........******
 ********........******
 ********........******
 ********........******

Pen does not seem to offer any setting for this and neither does the LineTo method. Is there maybe a windows API function I could call?

解决方案

Maybe ExtCreatePen helps. Check the PS_ENDCAP_* and PS_JOIN_* flags.

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