[android-developers] Measuring/drawing text on a scaled Canvas
Hi,
I've been struggling with text measuring and scaled canvases.
When the canvas is unscaled, getTextBounds and measureText deliver
accurate results. However, when the canvas is scaled both methods do
not deliver results that match the actual size of a printed text.
For testing I've created a subclass of View with the following onDraw
method:
final float scaling = 0.51f;
final int fontSize = 50;
canvas.scale(scaling, scaling);
font = Typeface.create(Arial, Typeface.NORMAL);
Paint paint = new Paint();
paint.setColor(0xffff);
paint.setTypeface(font);
paint.setTextSize(fontSize);
paint.setAntiAlias(true);
int x = 10;
int y = 100;
final String text = Lorem ipsum dolor sit amet, consectetur
adipisici elit...;
canvas.drawText(text, x, y, paint);
// draw border using getTextBounds
paint.setColor(0x);
paint.setStyle(Paint.Style.STROKE);
paint.setTypeface(font);
paint.setTextSize(fontSize);
Rect bounds = new Rect();
paint.getTextBounds(text, 0, text.length(), bounds);
bounds.offset(x, y);
paint.setColor(0x8000);
canvas.drawRect(bounds, paint);
// draw border using measureText
float w = paint.measureText(text);
bounds.left = x;
bounds.right = (int) Math.ceil(bounds.left + w);
bounds.top -= 10;
bounds.bottom += 10;
paint.setColor(0x8000);
paint.setPathEffect(new DashPathEffect(new float[] { 10, 10 },
0));
canvas.drawRect(bounds, paint);
for scaling = 0.5 I get the following output:
http://www.tiikoni.com/tis/view/?id=911e914
for scaling = 0.51 the following result is shown:
http://www.tiikoni.com/tis/view/?id=fad4658
(The actual result may vary depending on screen size, the important
part is that the results can vary completely when changing the scale
factor only a little)
The yellow solid border marks the rect delivered from getTextBounds,
the dashed cyan rect is rendered using the width delivered from
measureText.
As you can see, the text with scaling = 0.5 is smaller than the
measured dimensions and with scaling=0.51 the drawn text is way bigger
than the measured dimension.
Any help is appreciated!
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