Android：Paint.breakText(...) 不准确吗？
我有一个视图，它绘制一个矩形，其中包含一行文本。视图使用分隔文本来确保没有文本延伸到矩形之外；它会忽略任何这样做的文本。这对于某些字符来说效果很好，但通常由“l”和“f”组成的字符串会延伸到矩形之外。所以，我需要在这里进行健全性检查：下面的代码是否存在一些明显的缺陷，或者 Paint.breakText(...) 是否可能不准确？
public void onDraw(Canvas canvas)
{
int MARGIN = 1;
int BORDER_WIDTH = 1;
Paint p = new Paint();
p.setAntiAlias(true);
p.setTextSize(12);
p.setTypeface(Typeface.create(Typeface.SERIF, Typeface.NORMAL));
RectF rect = getRect();
float maxWidth = rect.width() - MARGIN - BORDER_WIDTH * 2;
String str = getText();
char[] chars = str.toCharArray();
int nextPos = p.breakText(chars, 0, chars.length, maxWidth, null);
str = str.substring(0, nextPos);
float textX = MARGIN + BORDER_WIDTH;
float textY = (float) (Math.abs(p.getFontMetrics().ascent) + BORDER_WIDTH + MARGIN);
canvas.drawText(str, textX, textY, p);
p.setStrokeWidth(BORDER_WIDTH);
p.setStyle(Style.STROKE);
canvas.drawRect(rect, p);
}
I have a View which draws a rectangle with a line of text inside of it. The view uses break text to ensure that no text extends outside of the rectangle; it ignores any text that does. This works fine for some characters, but often Strings made up of 'l's and 'f's extend outside of the rectangle. So, I'm in need of a sanity check here: Is there some obvious flaw in my below code, or is it possible that Paint.breakText(...) is inaccurate?
public void onDraw(Canvas canvas)
{
int MARGIN = 1;
int BORDER_WIDTH = 1;
Paint p = new Paint();
p.setAntiAlias(true);
p.setTextSize(12);
p.setTypeface(Typeface.create(Typeface.SERIF, Typeface.NORMAL));
RectF rect = getRect();
float maxWidth = rect.width() - MARGIN - BORDER_WIDTH * 2;
String str = getText();
char[] chars = str.toCharArray();
int nextPos = p.breakText(chars, 0, chars.length, maxWidth, null);
str = str.substring(0, nextPos);
float textX = MARGIN + BORDER_WIDTH;
float textY = (float) (Math.abs(p.getFontMetrics().ascent) + BORDER_WIDTH + MARGIN);
canvas.drawText(str, textX, textY, p);
p.setStrokeWidth(BORDER_WIDTH);
p.setStyle(Style.STROKE);
canvas.drawRect(rect, p);
}
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这是通过以下方法修复的：Paint.setSubpixelText(true);
This was fixed by: Paint.setSubpixelText(true);
问题可能是你如何绘制矩形。笔划不在矩形之外，笔划的一半在内部，一半在外部。
The problem might be how you draw your rectangle. Strokes are not outside of the rectangle, half of the stroke is inside, half is outside.