Android字符串进阶之三:字体属性及测量(FontMetrics)
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2012-05-21 20:44:05
标签:android Paint FontMetrics textSize
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- public class FontMetricsDemoActivity extends Activity {
- private Canvas canvas;
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- Paint textPaint = new Paint( Paint.ANTI_ALIAS_FLAG);
- textPaint.setTextSize( 55);
- textPaint.setColor( Color.WHITE);
- // FontMetrics对象
- FontMetrics fontMetrics = textPaint.getFontMetrics();
- String text = "abcdefghijklmnopqrstu";
- // 计算每一个坐标
- 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;
- float leading = baseY + fontMetrics.leading;
- Log.d("fontMetrics", "baseX is:" + 0);
- Log.d("fontMetrics", "baseY is:" + 100);
- Log.d("fontMetrics", "topY is:" + topY);
- Log.d("fontMetrics", "ascentY is:" + ascentY);
- Log.d("fontMetrics", "descentY is:" + descentY);
- Log.d("fontMetrics", "bottomY is:" + bottomY);
- Log.d("fontMetrics", "leading is:" + leading);
- Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.fontmetrics);
- Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
- canvas = new Canvas(mutableBitmap);
- // 绘制文本
- canvas.drawText(text, baseX, baseY, textPaint);
- // BaseLine描画
- Paint baseLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG);
- baseLinePaint.setColor( Color.RED);
- canvas.drawLine(0, baseY, canvas.getWidth(), baseY, baseLinePaint);
- // Base描画
- canvas.drawCircle( baseX, baseY, 5, baseLinePaint);
- // TopLine描画
- Paint topLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG);
- topLinePaint.setColor( Color.LTGRAY);
- canvas.drawLine(0, topY, canvas.getWidth(), topY, topLinePaint);
- // AscentLine描画
- Paint ascentLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG);
- ascentLinePaint.setColor( Color.GREEN);
- canvas.drawLine(0, ascentY, canvas.getWidth(), ascentY, ascentLinePaint);
- // DescentLine描画
- Paint descentLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG);
- descentLinePaint.setColor( Color.YELLOW);
- canvas.drawLine(0, descentY, canvas.getWidth(), descentY, descentLinePaint);
- // ButtomLine描画
- Paint bottomLinePaint = new Paint( Paint.ANTI_ALIAS_FLAG);
- bottomLinePaint.setColor( Color.MAGENTA);
- canvas.drawLine(0, bottomY, canvas.getWidth(), bottomY, bottomLinePaint);
- ImageView imageView = (ImageView) findViewById(R.id.imageView1);
- imageView.setImageBitmap(mutableBitmap);
- }
- }
- //test_multiply_lines
- TextView textView = (TextView) findViewById(R.id.textView1);
- String textMultiLines = "abcdefghijklmnopqrstuabcdefghijklmnopqrstuabcdefghijklmnopqrstuabcdefghijklmnopqrstuabcdefghijklmnopqrstu";
- textView.setTextSize(55);
- textView.setText(textMultiLines);
- FontMetrics fontMetrics2 = textView.getPaint().getFontMetrics();
- // 计算每一个坐标
- float topY = fontMetrics2.top;
- float ascentY = fontMetrics2.ascent;
- float descentY = fontMetrics2.descent;
- float bottomY = fontMetrics2.bottom;
- float leading = fontMetrics2.leading;
- Log.d("fontMetrics", "topY is:" + topY);
- Log.d("fontMetrics", "ascentY is:" + ascentY);
- Log.d("fontMetrics", "descentY is:" + descentY);
- Log.d("fontMetrics", "bottomY is:" + bottomY);
- Log.d("fontMetrics", "leading is:" + leading);
- String text = "abcdefghijklmnopqrstu";
- TextView textView = (TextView) findViewById(R.id.textView1);
- textView.setTextSize(55);
- textView.setText(text);
- FontMetrics fontMetrics = textView.getPaint().getFontMetrics();
- // 计算每一个坐标
- 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;
- float leading = fontMetrics.leading;
- Log.d("fontMetrics", "topY is:" + fontMetrics.top);
- Log.d("fontMetrics", "ascentY is:" + fontMetrics.ascent);
- Log.d("fontMetrics", "descentY is:" + fontMetrics.descent);
- Log.d("fontMetrics", "bottomY is:" + fontMetrics.bottom);
- Log.d("fontMetrics", "leading is:" + fontMetrics.leading);
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- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶之三:字体属性及测量(FontMetrics)
- Android字符串进阶:字体属性及测量(FontMetrics)
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