Skip to content

Instantly share code, notes, and snippets.

@AndriyBas
Last active November 24, 2016 21:05
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save AndriyBas/26183b52fc93ad0d6fdbd344ff712cb4 to your computer and use it in GitHub Desktop.
Save AndriyBas/26183b52fc93ad0d6fdbd344ff712cb4 to your computer and use it in GitHub Desktop.
@NonNull
private Bitmap createBitmap(@NonNull TextLayer textLayer, @Nullable Bitmap reuseBmp) {
int boundsWidth = canvasWidth;
// init params - size, color, typeface
textPaint.setStyle(Paint.Style.FILL);
textPaint.setTextSize(textLayer.getFont().getSize() * canvasWidth);
textPaint.setColor(textLayer.getFont().getColor());
textPaint.setTypeface(fontProvider.getTypeface(textLayer.getFont().getFace()));
// drawing text guide : http://ivankocijan.xyz/android-drawing-multiline-text-on-canvas/
// Static layout which will be drawn on canvas
StaticLayout sl = new StaticLayout(
textLayer.getText(), // - text which will be drawn
textPaint,
boundsWidth, // - width of the layout
Layout.Alignment.ALIGN_CENTER, // - layout alignment
1, // 1 - text spacing multiply
1, // 1 - text spacing add
true); // true - include padding
// calculate height for the entity, min - Limits.MIN_BITMAP_HEIGHT
int boundsHeight = sl.getHeight();
// create bitmap not smaller than TextLayer.Limits.MIN_BITMAP_HEIGHT
int bmpHeight = (int) (canvasHeight * Math.max(TextLayer.Limits.MIN_BITMAP_HEIGHT,
1.0F * boundsHeight / canvasHeight));
// create bitmap where text will be drawn
Bitmap bmp;
if (reuseBmp != null && reuseBmp.getWidth() == boundsWidth
&& reuseBmp.getHeight() == bmpHeight) {
// if previous bitmap exists, and it's width/height is the same - reuse it
bmp = reuseBmp;
bmp.eraseColor(Color.TRANSPARENT); // erase color when reusing
} else {
bmp = Bitmap.createBitmap(boundsWidth, bmpHeight, Bitmap.Config.ARGB_8888);
}
Canvas canvas = new Canvas(bmp);
canvas.save();
// move text to center if bitmap is bigger that text
if (boundsHeight < bmpHeight) {
//calculate Y coordinate - In this case we want to draw the text in the
//center of the canvas so we move Y coordinate to center.
float textYCoordinate = (bmpHeight - boundsHeight) / 2;
canvas.translate(0, textYCoordinate);
}
//draws static layout on canvas
sl.draw(canvas);
canvas.restore();
return bmp;
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment