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 cropWithCanvas(Bitmap bitmap, Rect cropRect) {
    Rect destRect = new Rect(0, 0, cropRect.width(), cropRect.height());
    Bitmap cropped = Bitmap.createBitmap(cropRect.width(), cropRect.height(), Bitmap.Config.RGB_565);
    Canvas canvas = new Canvas(cropped);
    canvas.drawBitmap(bitmap, cropRect, destRect, null);
    return cropped;
}

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From source file:Main.java

public static Bitmap cropJpgFile(String inFl, String outFl) throws IOException {
    Bitmap bmpIn = BitmapFactory.decodeFile(inFl);
    Bitmap bmOverlay = Bitmap.createBitmap(bmpIn.getWidth(), bmpIn.getHeight(), Bitmap.Config.ARGB_8888);
    Paint p = new Paint();
    p.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
    Canvas c = new Canvas(bmOverlay);
    c.drawBitmap(bmpIn, 0, 0, null);/*  w w w . j  a  va  2 s  . com*/
    //c.drawRect(30, 30, 100, 100, p);
    File fileOut = new File(outFl);
    FileOutputStream out = new FileOutputStream(fileOut);
    bmOverlay = drawTextToBitmap(bmOverlay, "Image Viewer");
    bmOverlay.compress(Bitmap.CompressFormat.JPEG, 100, out);
    return bmOverlay;
}

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From source file:Main.java

public static Bitmap toGrayscale(Bitmap bmpOriginal) {
    int width, height;
    height = bmpOriginal.getHeight();/*  w w  w .  ja va2  s.  co m*/
    width = bmpOriginal.getWidth();

    Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    Canvas c = new Canvas(bmpGrayscale);
    Paint paint = new Paint();
    ColorMatrix cm = new ColorMatrix();
    cm.setSaturation(0);
    ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
    paint.setColorFilter(f);
    c.drawBitmap(bmpOriginal, 0, 0, paint);
    return bmpGrayscale;
}

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From source file:Main.java

public static Bitmap drawTextToBitmap(Context gContext, String gText, int frontColor, int backColor) {
    Resources resources = gContext.getResources();
    float scale = resources.getDisplayMetrics().density;
    int w = 1536, h = 1280;
    Bitmap.Config conf = Bitmap.Config.ARGB_8888; // see other conf types
    Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
    android.graphics.Bitmap.Config bitmapConfig = bmp.getConfig();
    Canvas canvas = new Canvas(bmp);

    // new antialised Paint
    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    // text color - #3D3D3D
    paint.setColor(frontColor);/*www . j  a v  a 2s.  c o m*/
    // text size in pixels
    paint.setTextSize((int) (400 * scale));
    // text shadow
    //paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);

    // draw text to the Canvas center
    if (backColor != -1) {
        canvas.drawColor(backColor);
    }
    Rect bounds = new Rect();
    paint.getTextBounds(gText, 0, gText.length(), bounds);
    int x = (bmp.getWidth() - bounds.width()) / 2;
    int y = (bmp.getHeight() + bounds.height()) / 2;
    canvas.drawText(gText, x, y, paint);
    return bmp;
}

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From source file:Main.java

public static Bitmap drawableToBitmap(Drawable drawable) {
    if (drawable instanceof BitmapDrawable) {
        BitmapDrawable bitmapDrawable = ((BitmapDrawable) drawable);
        return bitmapDrawable.getBitmap();
    } else {/*  w  ww  .j  a v  a2s .  c  o  m*/
        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
                drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);

        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
        drawable.draw(canvas);
        return bitmap;
    }
}

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From source file:Main.java

public static Bitmap drawViewToBitmap(View view, int width, int height, float translateX, float translateY,
        int scaleRatio) {
    float scale = 1f / scaleRatio;
    int bmpWidth = (int) (width * scale - translateX / scaleRatio);
    int bmpHeight = (int) (height * scale - translateY / scaleRatio);
    Bitmap dest = Bitmap.createBitmap(bmpWidth, bmpHeight, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(dest);
    c.translate(-translateX / scaleRatio, -translateY / scaleRatio);
    if (scaleRatio > 1) {
        c.scale(scale, scale);//from   w ww  .  j  av a2s  . c o m
    }
    view.draw(c);
    return dest;
}

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From source file:Main.java

public static Bitmap drawTextCenterToBitmap(Bitmap bitmap, String text, int textSize, int textColor) {
    android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();
    // set default bitmap config if none
    if (bitmapConfig == null) {
        bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
    }/*w  w w. j av a 2s  .  co  m*/
    // resource bitmaps are imutable,
    // so we need to convert it to mutable one
    bitmap = bitmap.copy(bitmapConfig, true);

    Canvas canvas = new Canvas(bitmap);
    // new antialised Paint
    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    // text color - #3D3D3D
    paint.setColor(textColor);
    // text size in pixels
    paint.setTextSize(textSize);
    // text shadow
    paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);

    // draw text to the Canvas center
    Rect bounds = new Rect();
    paint.getTextBounds(text, 0, text.length(), bounds);
    //int x = (bitmap.getWidth() - bounds.width()) / 2;
    //int y = (bitmap.getHeight() + bounds.height()) / 2;
    //draw  text  to the bottom
    int x = (bitmap.getWidth() - bounds.width()) / 10 * 5;
    int y = (bitmap.getHeight() + bounds.height()) / 10 * 5;
    canvas.drawText(text, x, y, paint);

    return bitmap;
}

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From source file:Main.java

/**
 * Convert bitmap to the grayscale//w w  w  .  j  a v  a  2 s.  c  om
 * http://androidsnippets.com/convert-bitmap-to-grayscale
 *
 * @param bmpOriginal Original bitmap
 * @return Grayscale bitmap
 */
public static Bitmap toGrayscale(Bitmap bmpOriginal) {
    final int height = bmpOriginal.getHeight();
    final int width = bmpOriginal.getWidth();

    final Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Config.ARGB_8888);
    final Canvas c = new Canvas(bmpGrayscale);
    final Paint paint = new Paint();
    final ColorMatrix cm = new ColorMatrix();
    cm.setSaturation(0);
    final ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
    paint.setColorFilter(f);
    c.drawBitmap(bmpOriginal, 0, 0, paint);
    return bmpGrayscale;
}

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From source file:Main.java

/**
 * Returns a rounded bitmap using specified bitmap image.
 * /*from   w  w  w.  j  ava 2s.c o m*/
 * @param scaleBitmapImage bitmap to make round image.
 * @return rounded bitmap
 */
public static Bitmap getRoundedShape(Bitmap scaleBitmapImage) {
    if (scaleBitmapImage == null)
        return null;

    int targetWidth = (int) DP;
    int targetHeight = (int) DP;
    Bitmap targetBitmap = Bitmap.createBitmap(targetWidth, targetHeight, Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(targetBitmap);
    Path path = new Path();

    path.addCircle(((float) targetWidth - 1) / 2, ((float) targetHeight - 1) / 2,
            (Math.min(((float) targetWidth), ((float) targetHeight)) / 2),

            Path.Direction.CCW);

    Paint p = new Paint();
    p.setAntiAlias(true);

    canvas.clipPath(path);
    canvas.drawBitmap(scaleBitmapImage,
            new Rect(0, 0, scaleBitmapImage.getWidth(), scaleBitmapImage.getHeight()),
            new Rect(0, 0, targetWidth, targetHeight), p);

    p.setARGB(255, 16, 18, 16);

    scaleBitmapImage.recycle();

    return targetBitmap;
}

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From source file:Main.java

public static Bitmap getRoundedCornerBitmap(Context context, Bitmap input, int pixels, int w, int h,
        boolean squareTL, boolean squareTR, boolean squareBL, boolean squareBR) {

    bitmapResult = Bitmap.createBitmap(w, h, Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmapResult);
    final float densityMultiplier = context.getResources().getDisplayMetrics().density;

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0 + 5, 0 + 5, w - 5, h - 5);
    final RectF rectF = new RectF(rect);

    // make sure that our rounded corner is scaled appropriately

    final float roundPx = pixels * densityMultiplier;

    paint.setAntiAlias(true);/*from w ww .  j a  v a2  s . c  om*/
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    // canvas.drawColor(Color.BLACK);
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

    // draw rectangles over the corners we want to be square
    if (squareTL) {
        canvas.drawRect(0, 0, w / 2, h / 2, paint);
    }
    if (squareTR) {
        canvas.drawRect(w / 2, 0, w, h / 2, paint);
    }
    if (squareBL) {
        canvas.drawRect(0, h / 2, w / 2, h, paint);
    }
    if (squareBR) {
        canvas.drawRect(w / 2, h / 2, w, h, paint);
    }

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    // paint.setXfermode(new AvoidXfermode(Color.WHITE, 255,
    // AvoidXfermode.Mode.TARGET));
    canvas.drawBitmap(input, 0, 0, paint);

    return bitmapResult;
}

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