Example usage for android.graphics Matrix rectStaysRect

Introduction

In this page you can find the example usage for android.graphics Matrix rectStaysRect.

Prototype

public boolean rectStaysRect() 

Source Link

Document

Returns true if will map a rectangle to another rectangle.

Usage

From source file:Main.java

/**
 * Creates a mutable bitmap from subset of source bitmap, transformed by the optional matrix.
 *///from w  w w .  java2 s . c  o  m
private static Bitmap createBitmap(Bitmap source, int x, int y, int width, int height, Matrix m) {
    // Re-implement Bitmap createBitmap() to always return a mutable bitmap.
    Canvas canvas = new Canvas();

    Bitmap bitmap;
    Paint paint;
    if ((m == null) || m.isIdentity()) {
        bitmap = Bitmap.createBitmap(width, height, source.getConfig());
        paint = null;
    } else {
        RectF rect = new RectF(0, 0, width, height);
        m.mapRect(rect);
        bitmap = Bitmap.createBitmap(Math.round(rect.width()), Math.round(rect.height()), source.getConfig());

        canvas.translate(-rect.left, -rect.top);
        canvas.concat(m);

        paint = new Paint(Paint.FILTER_BITMAP_FLAG);
        if (!m.rectStaysRect()) {
            paint.setAntiAlias(true);
        }
    }
    bitmap.setDensity(source.getDensity());
    canvas.setBitmap(bitmap);

    Rect srcBounds = new Rect(x, y, x + width, y + height);
    RectF dstBounds = new RectF(0, 0, width, height);
    canvas.drawBitmap(source, srcBounds, dstBounds, paint);
    return bitmap;
}

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