draw horizontal and vertical Aligned Text - Android android.graphics

Android examples for android.graphics:Canvas

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  2. Android
  3. android.graphics
  4. Canvas

Description

draw horizontal and vertical Aligned Text

Demo Code

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
enum TextVertAlign{
  Top, Middle, Baseline, Bottom/*  www .  j a  v  a  2 s  .  c o m*/
}
public class Main {

  public static void drawHvAlignedText(Canvas canvas, float x, float y, String s, Paint p, Paint.Align horizAlign,
      TextVertAlign vertAlign) {

    // Set horizontal alignment
    p.setTextAlign(horizAlign);

    // Get bounding rectangle - we need its attribute and method values
    Rect r = new Rect();
    p.getTextBounds(s, 0, s.length(), r); // Note: r.top will be negative

    // Compute y-coordinate we'll need for drawing text for specified
    // vertical alignment
    float textX = x;
    float textY = y;
    switch (vertAlign) {
    case Top:
      textY = y - r.top;
      break;
    case Middle:
      textY = y - r.top - r.height() / 2;
      break;
    case Baseline: // Default behavior - do nothing
      break;
    case Bottom:
      textY = y - (r.height() + r.top);
      break;
    }
    canvas.drawText(s, textX, textY, p);
  }

}

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