如何使用TextPainter绘制文本? [英] How do you use a TextPainter to draw text?
问题描述
有关CustomPainter绘制方法的文档说,要绘制文本在画布
上,使用 TextPainter
。因此,在我的 MyCustomPainter
的绘制方法中,我具有以下内容:
The documentation for CustomPainter's paint method says, "To paint text on a Canvas
, use a TextPainter
". So within my MyCustomPainter
's paint method I have the following:
TextSpan span = new TextSpan(text: 'Yrfc');
TextPainter tp = new TextPainter(text: span, textAlign: TextAlign.left);
tp.layout();
tp.paint(canvas, new Offset(5.0, 5.0));
我尝试了各种偏移量(Offset.zero,Offset。无限,新的偏移量(10.0,10.0)
,但我始终看不到屏幕上绘制的文本。
I've tried a variety of offsets (Offset.zero, Offset.infinite, new Offset(10.0, 10.0)
but I never am able to see the text painted on the screen.
推荐答案
我在输入此问题时找到了答案,但是现在我已经在努力角力了一段时间,因此发布以防万一,可以帮助其他人。
I found the answer as I was typing up this question but I've been wrestling with it for a while now, so posting in case it helps anyone else.
解决方案是将TextSpan行更改为:
What solved it was changing the TextSpan line to:
TextSpan span = new TextSpan(style:new TextStyle(color:Colors.grey [600]),文本: Yrfc);
显然,它是无形地绘制文本,还是自白色(背景)颜色绘制我没有明确选择颜色。
Apparently it was either drawing the text invisibly or as white (background) color since I hadn't made my color choice explicit.
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