Example usage for android.graphics Canvas Canvas

Introduction

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

Prototype

@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
public Canvas(long nativeCanvas)

Source Link

Usage

From source file:Main.java

public static Bitmap getColoredBitmap(Bitmap colorBitmap, int color) {
    Bitmap grayscaleBitmap = toGrayscale(colorBitmap);
    Paint pp = new Paint();
    PorterDuffColorFilter frontFilter = new PorterDuffColorFilter(color, PorterDuff.Mode.MULTIPLY);
    pp.setColorFilter(frontFilter);/*from w ww. j  a  v a2s.c o m*/
    Canvas cc = new Canvas(grayscaleBitmap);
    cc.drawBitmap(grayscaleBitmap, 0, 0, pp);
    return grayscaleBitmap;
}

From source file:Main.java

public static Bitmap asBitmap(Drawable drawable, int minWidth, int minHeight) {
    final Rect tmpRect = new Rect();
    drawable.copyBounds(tmpRect);/*  w ww  . ja  v a2s  .  c  om*/
    if (tmpRect.isEmpty()) {
        tmpRect.set(0, 0, Math.max(minWidth, drawable.getIntrinsicWidth()),
                Math.max(minHeight, drawable.getIntrinsicHeight()));
        drawable.setBounds(tmpRect);
    }
    Bitmap bitmap = Bitmap.createBitmap(tmpRect.width(), tmpRect.height(), Bitmap.Config.ARGB_8888);
    drawable.draw(new Canvas(bitmap));
    return bitmap;
}

From source file:Main.java

public static Bitmap drawableToBitmap(Drawable drawable, boolean lowQualityImage) {
    if (drawable == null || drawable.getIntrinsicWidth() <= 0 || drawable.getIntrinsicHeight() <= 0) {
        return null;
    }//from   www.  j a  v a2  s. c o  m

    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());

    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
            lowQualityImage ? Bitmap.Config.ARGB_4444 : Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    drawable.draw(canvas);
    return bitmap;
}

From source file:Main.java

public static Bitmap getBitmap(View view) {
    int width = view.getWidth();
    int height = view.getHeight();
    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    Canvas canvas = new Canvas(bitmap);
    canvas.translate(-view.getScrollX(), -view.getScrollY());
    view.draw(canvas);//from   w w  w . ja v  a 2  s  .  c  om
    return bitmap;
}

From source file:Main.java

public static Bitmap scaleBitmapForDevice(Bitmap bitmap) {
    if (bitmap == null) {
        return null;
    }/*  www .j av  a2 s .  c  o  m*/

    float density = Resources.getSystem().getDisplayMetrics().density;
    int newWidth = (int) (bitmap.getWidth() * density);
    int newHeight = (int) (bitmap.getHeight() * density);
    /*
    Bitmap resizeBitmap = Bitmap.createScaledBitmap(bitmap, width, height, true);
     */
    /**
     * http://stackoverflow.com/questions/4821488/bad-image-quality-after-resizing-scaling-bitmap#7468636
     */
    Bitmap scaledBitmap = Bitmap.createBitmap(newWidth, newHeight, Config.ARGB_8888);

    float ratioX = newWidth / (float) bitmap.getWidth();
    float ratioY = newHeight / (float) bitmap.getHeight();
    float middleX = newWidth / 2.0f;
    float middleY = newHeight / 2.0f;

    Matrix scaleMatrix = new Matrix();
    scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);

    Canvas canvas = new Canvas(scaledBitmap);
    canvas.setMatrix(scaleMatrix);
    canvas.drawBitmap(bitmap, middleX - bitmap.getWidth() / 2, middleY - bitmap.getHeight() / 2,
            new Paint(Paint.FILTER_BITMAP_FLAG));
    bitmap.recycle();

    return scaledBitmap;
}

From source file:Main.java

public static Bitmap createBitmap(Context context, ScrollView v) {
    int width = 0, height = 0;
    for (int i = 0; i < v.getChildCount(); i++) {
        width += v.getChildAt(i).getWidth();
        height += v.getChildAt(i).getHeight();
    }/*from  ww w.ja  va2  s.com*/
    if (width <= 0 || height <= 0) {
        return null;
    }
    int h = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getHeight();
    if (height < h)
        height = h;
    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    v.draw(canvas);
    return bitmap;
}

From source file:Main.java

public static Bitmap combineImages(Bitmap bgd, Bitmap fg) {
    Bitmap bmp;/*from  w  w w.  j  av  a  2 s.c  o  m*/

    int width = bgd.getWidth() > fg.getWidth() ? bgd.getWidth() : fg.getWidth();
    int height = bgd.getHeight() > fg.getHeight() ? bgd.getHeight() : fg.getHeight();

    bmp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
    Paint paint = new Paint();
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP));

    Canvas canvas = new Canvas(bmp);
    canvas.drawBitmap(bgd, 0, 0, null);
    canvas.drawBitmap(fg, 0, 0, paint);

    return bmp;
}

From source file:Main.java

public static Bitmap combineImages(Bitmap bgd, Bitmap fg) {
    Bitmap bmp;/*from www . j  a  v  a 2 s  .  c  o  m*/

    int width = bgd.getWidth() > fg.getWidth() ? bgd.getWidth() : fg.getWidth();
    int height = bgd.getHeight() > fg.getHeight() ? bgd.getHeight() : fg.getHeight();

    bmp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
    Paint paint = new Paint();
    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_ATOP));

    Canvas canvas = new Canvas(bmp);
    canvas.drawBitmap(bgd, 0, 0, null);
    canvas.drawBitmap(fg, 0, 0, paint);

    return bmp;
}

From source file:Main.java

public static Bitmap getGrayscale(@NonNull Bitmap src) {

    Bitmap dest = Bitmap.createBitmap(src.getWidth(), src.getHeight(), src.getConfig());

    Canvas canvas = new Canvas(dest);
    Paint paint = new Paint();
    ColorMatrixColorFilter filter = new ColorMatrixColorFilter(MATRIX);
    paint.setColorFilter(filter);//w w  w.  j a va  2 s .  c  o  m
    canvas.drawBitmap(src, 0, 0, paint);

    return dest;
}

From source file:Main.java

public static Bitmap toRoundBitmap(Bitmap bitmap) {
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    float roundPx;
    float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom;
    if (width <= height) {
        roundPx = width / 2;/*  w ww.  ja  v a 2 s.  c o  m*/
        left = 0;
        top = 0;
        right = width;
        bottom = width;
        height = width;
        dst_left = 0;
        dst_top = 0;
        dst_right = width;
        dst_bottom = width;
    } else {
        roundPx = height / 2;
        float clip = (width - height) / 2;
        left = clip;
        right = width - clip;
        top = 0;
        bottom = height;
        width = height;
        dst_left = 0;
        dst_top = 0;
        dst_right = height;
        dst_bottom = height;
    }
    Bitmap output = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output);
    final Paint paint = new Paint();
    final Rect src = new Rect((int) left, (int) top, (int) right, (int) bottom);
    final Rect dst = new Rect((int) dst_left, (int) dst_top, (int) dst_right, (int) dst_bottom);
    final RectF rectF = new RectF(dst);
    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, src, dst, paint);
    return output;
}