android-canvas

How can I create the bitmap from the canvas of custom view. There is no way to extract the Bitmap out of a Canvas . The only way you can access it is to pass it yourself when creating the canvas like this new Canvas(myBitmap) and keep the reference. EDIT2: see @Alex comment blow - the approach of passing a Bitmap to the Canvas does not seem to work for more recent versions of Android. EDIT : If you don't create the Canvas yourself, you could create a screen-sized Bitmap (or whatever size you need) and then pass it to the Canvas in onDraw calls like this: canvas.setBitmap(myBitmap) . While

I am using the following line of code to draw path on a Canvas, So far everything works fine and i can easily draw path using this code. But now our requirement is to draw path with variable width, means the path user draw is based on the pressure applied by the user, I mean to say if the user applied light pressure the path will be thin and if the user applied high pressure the path will be thick and so on. So far i succeeded in drawing path with variable width also, but the line drawn are not smooth. Why its happening so, is anything i miss in my code Help me to short this out. Code that I

What I want to do? (blue will be changed as white) What I did? I have found a class which extends TextView that able to outline textview very close to what I want. The problem is that I could not change stroke color to any color, it draws always as black. How to set border color as white? What is my output: Where are my codes? public class TypeFaceTextView extends TextView { private static Paint getWhiteBorderPaint(){ Paint p = new Paint(Color.WHITE); return p; } private static final Paint BLACK_BORDER_PAINT = getWhiteBorderPaint(); static { BLACK_BORDER_PAINT.setXfermode(new

I want to draw on canvas month's text vertical along screen height. Paint init: this.paint = new Paint(); this.paint.setAntiAlias(true); this.paint.setDither(true); this.paint.setSubpixelText(true); this.paint.setColor(color_text_dark); this.paint.setTextAlign(Align.RIGHT); Drawing: // Set the scale to the widest month float scale = getHeight() / this.max_month_width; String month_string = FULL_MONTH_NAME_FORMATTER. format(active_month_calendar.getTime()); canvas.save(); canvas.translate(getWidth(), 0); canvas.rotate(-90); canvas.scale(scale, scale); canvas.drawText(month_string, 0, 0, this

I'm having some difficulty with regards to placing the contents of a Canvas into a Bitmap. When I attempt to do this, the file gets written with a file size of around 5.80KB but it appears to be completely empty (every pixel is '#000'). The canvas draws a series of interconnected lines that are formed by handwriting. Below is my onDraw for the View. (I'm aware that it's blocking the UI thread / bad practices/ etc.., however I just need to get it working) Thank you. @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); if (IsTouchDown) { //

How do i make the bitmap created clickable? Below is the code which i have used to create a bitmap using canvas. public class DrawView extends View implements OnClickListener { public DrawView(Context context) { super(context); paint = new Paint(); image = BitmapFactory.decodeResource(getResources(), R.drawable.andmrktsmall); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int canWidth = canvas.getWidth(); int canHeight = canvas.getHeight(); int width = (canWidth - 200) / 2; int height = (canHeight - 100) / 2; Bitmap indexcanvas = Bitmap.createScaledBitmap(image, 200,

I have class MyView that extends View class. MyView should draw filled triangle. I drew a triangle but I cannot get it filled. This is my onDraw() method: @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); Paint paint = new Paint(); paint.setColor(android.graphics.Color.BLACK); canvas.drawPaint(paint); paint.setStrokeWidth(4); paint.setColor(android.graphics.Color.RED); paint.setStyle(Paint.Style.FILL_AND_STROKE); paint.setAntiAlias(true); Point a = new Point(0, 0); Point b = new Point(0, 100); Point c = new Point(87, 50); Path path = new Path(); path.setFillType(FillType

If I have a canvas, on which I draw a Bitmap like this: canvas.drawBitmap(bmLargeImage, srcRect, destRect, paint); and I scale the bitmap: canvas.scale(1.5f, 1.5f, 450, 250); I want to get the position of the Bitmap after the scale. If the position before scale was (0, 0), after scale there is a offset and I need that offset.. how can I get it? Thanks and sorry for the simple question, newbie here... Ok lets try to work out the best formula for this canvas.scale(scaleX, scaleY, pivotX, pivotY); if (scaleX >= 1){ objectNewX = objectOldX + (objectOldX - pivotX)*(scaleX - 1); }else{ objectNewX =

I'm trying to clip a canvas drawing operation to an arc-shaped wedge. However, I'm not getting the intended result after setting the clipping path to the canvas. For illustration, here is what I'm doing: path.reset(); //Move to point #1 path.moveTo(rect.centerX(), rect.centerY()); //Per the documentation, this will draw a connecting line from the current //position to the starting position of the arc (at 0 degrees), add the arc //and my current position now lies at #2. path.arcTo(rect, 0, -30); //This should then close the path, finishing back at the center point (#3) path.close(); This works,