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 BitmapDrawable writeOnDrawable(Activity actv, Resources res, int drawableId, String text,
        int textSize) {

    Bitmap bm = BitmapFactory.decodeResource(res, drawableId).copy(Bitmap.Config.ARGB_8888, true);

    DisplayMetrics dm = new DisplayMetrics();
    actv.getWindowManager().getDefaultDisplay().getMetrics(dm);

    int pixelSize = (int) ((textSize * dm.scaledDensity));

    if (text.length() > 2) {
        pixelSize = (int) ((textSize * dm.scaledDensity) * (0.5 - (text.length() / 10)));
    }//  w  ww  .  jav  a 2  s . c  om

    Paint paint = new Paint();
    paint.setStyle(Style.FILL);
    paint.setColor(Color.WHITE);
    paint.setTextSize(pixelSize);
    paint.setTextAlign(Paint.Align.CENTER);

    // float adjust = paint.measureText(text);

    Canvas canvas = new Canvas(bm);
    int xPos = (int) ((bm.getWidth() / 2));
    int yPos = (int) ((bm.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2));

    canvas.drawText(text, xPos, yPos, paint);

    return new BitmapDrawable(res, bm);
}

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From source file:Main.java

public static Bitmap createCircularClip(Bitmap input, int width, int height) {
    if (input == null)
        return null;

    final int inWidth = input.getWidth();
    final int inHeight = input.getHeight();
    final Bitmap output = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(output);
    final Paint paint = new Paint();
    paint.setShader(new BitmapShader(input, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));
    paint.setAntiAlias(true);//from ww w  .j a  va2s. c  o  m
    final RectF srcRect = new RectF(0, 0, inWidth, inHeight);
    final RectF dstRect = new RectF(0, 0, width, height);
    final Matrix m = new Matrix();
    m.setRectToRect(srcRect, dstRect, Matrix.ScaleToFit.CENTER);
    canvas.setMatrix(m);
    canvas.drawCircle(inWidth / 2, inHeight / 2, inWidth / 2, paint);
    return output;
}

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From source file:Main.java

public static Bitmap toBitmap(Drawable drawable) {
    if (drawable instanceof BitmapDrawable) {
        return ((BitmapDrawable) drawable).getBitmap();
    }//w  w w.ja v a2s.com

    int width = drawable.getIntrinsicWidth();
    width = width > 0 ? width : 1;
    int height = drawable.getIntrinsicHeight();
    height = height > 0 ? height : 1;

    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);

    return bitmap;
}

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From source file:Main.java

public static Bitmap drawableToBitmap(Drawable drawable) {
    int width = drawable.getIntrinsicWidth();
    int height = drawable.getIntrinsicHeight();
    Bitmap bitmap = Bitmap.createBitmap(width, height,
            drawable.getOpacity() != PixelFormat.OPAQUE ? Config.ARGB_8888 : Config.RGB_565);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, width, height);
    drawable.draw(canvas);//www . j  av  a2  s .  c o  m
    return bitmap;

}

---

From source file:Main.java

public static Bitmap drawableToBitmap(Drawable drawable) {
    int width = drawable.getIntrinsicWidth();
    int height = drawable.getIntrinsicHeight();
    Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
            : Bitmap.Config.RGB_565;//from  w  w w .j  av a 2 s  .co m
    Bitmap bitmap = Bitmap.createBitmap(width, height, config);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, width, height);
    drawable.draw(canvas);
    return bitmap;
}

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From source file:Main.java

public static Bitmap getCircularBitmap(Bitmap bm) {
    int size = 192;

    Bitmap bitmap = ThumbnailUtils.extractThumbnail(bm, size, size);

    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(output);

    final int color = 0xffff0000;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    final RectF rectF = new RectF(rect);

    paint.setAntiAlias(true);/*from w  w w .ja v  a2  s  . co m*/
    paint.setDither(true);
    paint.setFilterBitmap(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawOval(rectF, paint);

    paint.setColor(Color.BLUE);
    paint.setStyle(Paint.Style.STROKE);
    paint.setStrokeWidth((float) 4);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
}

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From source file:Main.java

public static Bitmap get_circular_bitmap(Bitmap bitmap) {
    Bitmap output;//  w  ww .j a va  2  s.c om

    if (bitmap.getWidth() > bitmap.getHeight()) {
        output = Bitmap.createBitmap(bitmap.getHeight(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    } else {
        output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getWidth(), Bitmap.Config.ARGB_8888);
    }

    Canvas canvas = new Canvas(output);

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

    float r = 0;

    if (bitmap.getWidth() > bitmap.getHeight()) {
        r = bitmap.getHeight() / 2;
    } else {
        r = bitmap.getWidth() / 2;
    }

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawCircle(r, r, r, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
}

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From source file:Main.java

/**
 * Create round, coloured bitmap with text embedded.
 * @param circleColor The color to use./*ww w . ja  v  a 2s .c o m*/
 * @param diameterDP The diameter of the circle.
 * @param text The text to embed.
 * @return Bitmap showing a text.
 */
public static Bitmap generateCircleBitmap(int circleColor, float diameterDP, String text) {
    /**
     *
     * http://stackoverflow.com/questions/31168636/rounded-quickcontactbadge-with-text
     */
    final int textColor = 0xffffffff;

    DisplayMetrics metrics = Resources.getSystem().getDisplayMetrics();
    float diameterPixels = diameterDP * (metrics.densityDpi / 160f);
    float radiusPixels = diameterPixels / 2;

    // Create the bitmap
    Bitmap output = Bitmap.createBitmap((int) diameterPixels, (int) diameterPixels, Bitmap.Config.ARGB_8888);

    // Create the canvas to draw on
    Canvas canvas = new Canvas(output);
    canvas.drawARGB(0, 0, 0, 0);

    // Draw the circle
    final Paint paintC = new Paint();
    paintC.setAntiAlias(true);
    paintC.setColor(circleColor);
    canvas.drawCircle(radiusPixels, radiusPixels, radiusPixels, paintC);

    // Draw the text
    if (text != null && text.length() > 0) {
        final Paint paintT = new Paint();
        paintT.setColor(textColor);
        paintT.setAntiAlias(true);
        paintT.setTextSize(radiusPixels * 2);
        paintT.setTypeface(Typeface.SANS_SERIF);
        final Rect textBounds = new Rect();
        paintT.getTextBounds(text, 0, text.length(), textBounds);
        canvas.drawText(text, radiusPixels - textBounds.exactCenterX(),
                radiusPixels - textBounds.exactCenterY(), paintT);
    }

    return output;
}

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From source file:Main.java

public static Bitmap scaleBitmap(Bitmap bitmap, int width, int height) {
    int newWidth = width;
    int newHeight = height;
    // if(newWidth < bitmap.getWidth()){
    // return bitmap;
    // }/* ww w  .  j  a va2  s .  co m*/
    if (newHeight == 0) {
        newHeight = (int) (newWidth / (float) bitmap.getWidth() * bitmap.getHeight());
    }
    Bitmap result = Bitmap.createBitmap(newWidth, newHeight, Config.ARGB_8888);
    Canvas canvas = new Canvas(result);
    Matrix matrix = new Matrix();
    float scaleX = 1;
    float scaleY = 1;
    // if(newWidth>bitmap.getWidth()){
    scaleX = newWidth / (float) bitmap.getWidth();
    if (height != 0) {
        scaleY = newHeight / (float) bitmap.getHeight();
    } else {
        scaleY = scaleX;
    }
    // }
    matrix.postScale(scaleX, scaleY);
    canvas.drawBitmap(bitmap, matrix, null);
    return result;
}

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From source file:Main.java

public static Bitmap createReflectedBitmap(Bitmap srcBitmap, float reflectHeight) {
    if (null == srcBitmap) {
        return null;
    }//from w  w  w . ja va  2 s . co m

    int srcWidth = srcBitmap.getWidth();
    int srcHeight = srcBitmap.getHeight();
    int reflectionWidth = srcBitmap.getWidth();
    int reflectionHeight = reflectHeight == 0 ? srcHeight / 3 : (int) (reflectHeight * srcHeight);

    if (0 == srcWidth || srcHeight == 0) {
        return null;
    }

    // The matrix
    Matrix matrix = new Matrix();
    matrix.preScale(1, -1);

    try {
        // The reflection bitmap, width is same with original's
        Bitmap reflectionBitmap = Bitmap.createBitmap(srcBitmap, 0, srcHeight - reflectionHeight,
                reflectionWidth, reflectionHeight, matrix, false);

        if (null == reflectionBitmap) {
            return null;
        }

        Canvas canvas = new Canvas(reflectionBitmap);

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

        LinearGradient shader = new LinearGradient(0, 0, 0, reflectionBitmap.getHeight(), 0x70FFFFFF,
                0x00FFFFFF, Shader.TileMode.MIRROR);
        paint.setShader(shader);

        paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.DST_IN));

        // Draw the linear shader.
        canvas.drawRect(0, 0, reflectionBitmap.getWidth(), reflectionBitmap.getHeight(), paint);

        return reflectionBitmap;
    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;
}

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