CODEWITHSUNDEEP
androidandroid-layoutandroid-canvasandroid-view
shashank
shashank

Reputation: 41

Canvas fill color between two lines

I have two lines where one line is drawn at the same point every time and the other line is rotated by a certain degree every time the view is invalidated.

The code is as shown below :

 protected void onDraw(Canvas canvas) {
            int width = getWidth();
            int height = getHeight();
            int centerx = width/2;
            int centery = height/2;
            canvas.drawLine(centerx, 0, centerx, height, paint);
            canvas.drawLine(0, centery, width, centery, paint);
            if (angle_in_degrees!= null)
                canvas.rotate(angle_in_degrees, centerx, centery);
            paint.setColor(0xff0000ff);
            canvas.drawLine(centerx, -1000, centerx, +1000, paint);
            canvas.drawLine(-1000, centery, 1000, centery, paint);
            paint.setColor(0xff00ff00);
        }

Everything works fine, but I want to fill the space between the two lines by a different color. How do I do that? Thanks.

Upvotes: 0

Views: 2523

Answers (1)

PPartisan
PPartisan

Reputation: 8231

The accepted answer to this question sounds as if it would apply just as well to your situation. Essentially, the author uses a Path object to connect the dots between all points that need to be filled, before finally called canvas.drawPath() to fill the area inside.

In your case, this would probably look something like:

Path path = new Path();
path.lineTo(centerX, 0);
path.lineTo(centerX, height);
path.lineTo(0, centerY);
//etc. Essentially mirroring what your line does, but in one dimension (x,y) points.
canvas.drawPath(path, paint);

Edit: You would also need to make sure the Paint object you use has a FILL style:

paint.setStyle(Paint.Style.FILL);

Upvotes: 2

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