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轉自 ：http://fonter.iteye.com/blog/474526

Canvas 作為繪制文本時，使用FontMetrics對象，計算位置的坐標。

它的思路和java.awt.FontMetrics的基本相同。

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FontMetrics對象

它以四個基本坐標為基準，分別為：

?FontMetrics.top
?FontMetrics.ascent
?FontMetrics.descent
?FontMetrics.bottom

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該圖片將如下

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Paint textPaint = new Paint( Paint.ANTI_ALIAS_FLAG); textPaint.setTextSize( 35); textPaint.setColor( Color.WHITE);// FontMetrics對象 FontMetrics fontMetrics = textPaint.getFontMetrics();String text = "abcdefghijklmnopqrstu";// 計算每一個坐標 float baseX = 0; float baseY = 100; float topY = baseY + fontMetrics.top; float ascentY = baseY + fontMetrics.ascent; float descentY = baseY + fontMetrics.descent; float bottomY = baseY + fontMetrics.bottom;// 繪制文本 canvas.drawText( text, baseX, baseY, textPaint);// BaseLine描畫 Paint baseLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG);> baseLinePaint.setColor( Color.RED); canvas.drawLine(0, baseY, getWidth(), baseY, baseLinePaint);// Base描畫 canvas.drawCircle( baseX, baseY, 5, baseLinePaint);// TopLine描畫 Paint topLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG); topLinePaint.setColor( Color.LTGRAY); canvas.drawLine(0, topY, getWidth(), topY, topLinePaint);// AscentLine描畫 Paint ascentLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG); ascentLinePaint.setColor( Color.GREEN); canvas.drawLine(0, ascentY, getWidth(), ascentY, ascentLinePaint);// DescentLine描畫 Paint descentLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG); descentLinePaint.setColor( Color.YELLOW); canvas.drawLine(0, descentY, getWidth(), descentY, descentLinePaint);// ButtomLine描畫 Paint bottomLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG); bottomLinePaint.setColor( Color.MAGENTA); canvas.drawLine(0, bottomY, getWidth(), bottomY, bottomLinePaint);

轉載于:https://my.oschina.net/u/913208/blog/122330

總結

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