Center display of cells in the font

Baseline, ascenter, and descenter)

Upper slope (ascent) and lower slope (Descent)

Leading: the distance from the bottom to the top of the next line.

Font Height = Top slope + bottom slope + row spacing

Ascent refers to the distance from a baseline to the top, and descent refers to the distance from the baseline of a word to the bottom.

Note that both ascent and top are negative.

 

The following code shows that the height of a cell is only 0.75 in the center, so move down to a certain distance from Y.

Foreground. setstyle (style. Fill );

Foreground. settextsize (height * 0.75f );

Foreground. settextscalex (width/height );

Foreground. settextalign (paint. Align. center );

// Draw the number in the center of the tile

Fontmetrics fm = foreground. getfontmetrics ();

// Centering in X: Use alignment (and X at midpoint)

Float x = width/2;

// Centering in Y: Measure ascent/descent first

Float y = height/2-(FM. ascent + FM. Descent)/2;

 

Network example :( reference http://www.javaeye.com/topic/474526)

Package com. texttest;

Import Android. App. activity;

Import Android. content. context;

Import Android. Graphics. Canvas;

Import Android. Graphics. color;

Import Android. Graphics. paint;

Import Android. Graphics. Paint. fontmetrics;

Import Android. OS. Bundle;

Import Android. View. view;

Public class texttest extends activity {

/** Called when the activity is first created .*/

@ Override

Public void oncreate (bundle savedinstancestate ){

Super. oncreate (savedinstancestate );

// Setcontentview (R. layout. Main );

Setcontentview (New graphview (this ));

}

Static public class graphview extends view {

Public graphview (context ){

Super (context );

}

@ Override

Protected void ondraw (canvas ){

//

Paint textpaint = new paint (paint. anti_alias_flag );

Textpaint. settextsize (35 );

Textpaint. setcolor (color. White );

// Fontmetrics object

Fontmetrics = textpaint. getfontmetrics ();

String text = "abcdefghijklmnopqrstu ";

// Calculate each coordinate

Float basex = 0;

Float basis = 100;

Float topy = basey + fontmetrics. Top;

Float ascenty = basey + fontmetrics. ascent;

Float descenty = basey + fontmetrics. descent;

Float bottomy = basey + fontmetrics. bottom;

// Draw text

Canvas. drawtext (text, basex, basey, textpaint );

// Baseline plotting

Paint baselinepaint = new paint (paint. anti_alias_flag );

Baselinepaint. setcolor (color. Red );

Canvas. drawline (0, basey, getwidth (), basey, baselinepaint );

// Base plotting

Canvas. drawcircle (basex, basey, 5, baselinepaint );

// Topline plotting

Paint toplinepaint = new paint (paint. anti_alias_flag );

Toplinepaint. setcolor (color. ltgray );

Canvas. drawline (0, topy, getwidth (), topy, toplinepaint );

// Ascentline plotting

Paint ascentlinepaint = new paint (paint. anti_alias_flag );

Ascentlinepaint. setcolor (color. Green );

Canvas. drawline (0, ascenty, getwidth (), ascenty, ascentlinepaint );

// Descentline

Paint descentlinepaint = new paint (paint. anti_alias_flag );

Descentlinepaint. setcolor (color. Yellow );

Canvas. drawline (0, descenty, getwidth (), descenty, descentlinepaint );

// Buttomline plotting

Paint bottomlinepaint = new paint (paint. anti_alias_flag );

Bottomlinepaint. setcolor (color. Magenta );

Canvas. drawline (0, bottomy, getwidth (), bottomy, bottomlinepaint );

}

}

}