"Android" Font Basic

Font

The final size of the text is related to the type of font and the size of the font in which the text is drawn.

Set Font type Paint.settypeface (Typeface Typeface)

Set Font size paint.settextsize (float textSize)

Several related dimensions and methodsPaint.fontmetrics

There are 5 properties, and these 5 properties are font-related.

top: 字体中字符超出基线之上的最大距离bottom: 字体中字符超出基线之下的最大距离ascent: 单个字符超出基线之上的推荐距离descent: 单个字符超出基线之上的推荐距离leading: 标准行间距

Paint.gettextbounds

This method gets the rectangle area occupied by the character [string], meaning the rectangular area of the visible part of the font

Rect bound = new Rect();mPaint.getTextBounds(text, 0, text.length(), bound);bound.right - bound.left //得到的就是字符[字符串]的可见部分矩形区域的宽度

Mpaint.measuretext (text)

Returns the width of the character [string], paying attention to the

bound.right - bound.left

Differentiated from one another.

Because there is usually a portion of white space on either side of each character, it is easy to read. So the size of the measuretext is usually greater than bound.right-bound.left. So, for a single character, say:

measureText = bound.right - bound.left + 字符两边的留白宽度

The overall diagram is as follows

Application Scenarios

1. Vertically centered text, the calculation of the baseline position using FontMetrics is more convenient.

2. Or the size of the problem to achieve alignment, the use of gettextbounds more convenient.

3. Get the ideal width of text, easy to use Measuretext

Diagram code

Paint Mpaint = new paint (Paint.anti_alias_flag);    Rect bound = new rect (), @Overridepublic void OnDraw (canvas canvas) {super.ondraw (canvas);    Mpaint.settextsize (600);    String text = "P"; DRAW1 (canvas, text, 800);}    private void Draw1 (canvas canvas, String text, float Baseliney) {mpaint.gettextbounds (text, 0, text.length (), bound);    Mpaint.setcolor (Color.rgb (0xb4, 0xb4, 0xb4));    Canvas.drawrect (Bound.left, Bound.top + Baseliney, bound.right, Bound.bottom + Baseliney, mPaint);    Float width = mpaint.measuretext (text);    Mpaint.setcolor (Color.rgb (0x00, 0x00, 0x00));    Canvas.drawrect (Bound.left, Bound.top + baseLineY-30, Bound.left + width, bound.top + baseLineY-20, mpaint);    Paint.fontmetrics FontMetrics = Mpaint.getfontmetrics ();    Mpaint.setcolor (Color.Black);    Canvas.drawtext (text, 0, Baseliney, mpaint);    Canvas.drawline (0, Baseliney, getwidth (), Baseliney, mpaint);    Mpaint.setcolor (color.red); Canvas.drawline (0, Baseliney + fontmetrics.top, getwidth (), Baseliney + fontmetrics.top, mpaint);    Canvas.drawline (0, Baseliney + fontmetrics.bottom, getwidth (), Baseliney + Fontmetrics.bottom, mPaint);    Mpaint.setcolor (Color.Blue);    Canvas.drawline (0, Baseliney + fontmetrics.ascent, getwidth (), Baseliney + fontmetrics.ascent, mPaint); Canvas.drawline (0, Baseliney + fontmetrics.descent, getwidth (), Baseliney + fontmetrics.descent, mPaint);}

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"Android" Font Basic