android canvas drawText 使用说明

public void drawText(String text, float x, float y,Paint paint)

Parameters：
text The text to be drawn //要绘制的文本
x The x-coordinate of the origin of the text being drawn //要绘制文本起始点的x坐标
y The y-coordinate of the origin of the text being drawn //要绘制文本起始点的y坐标
paint The paint used for the text (e.g. color, size, style) //画笔

这里要特别说明的一点是：origin，起始点指的是从该点右上区域开始绘制文本，也就是绘制文本区域的左下角的点。

Paint.FontMetrics

Fields

如下属性主要表示画笔绘制区域内文本与边框的距离：

public float ascent The recommended distance above the baseline for singled spaced text. //某个文本基线往上的距离（为负数）
public float bottom The maximum distance below the baseline for the lowest glyph in the font at a given text size. //以一行文本最靠下的位置为基线往下的距离
public float descent The recommended distance below the baseline for singled spaced text. //某个文本基线往下的距离
public float leading The recommended additional space to add between lines of text. //行与行之间距
public float top The maximum distance above the baseline for the tallest glyph in the font at a given text size. //以一行文本最靠上的位置为基线往上的距离(为负数)

public void drawText(String text, float x, float y,Paint paint)

Paint.FontMetrics

Fields

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