CODEWITHSUNDEEP
androidcanvas2ddrawpaint
ax1mx2
ax1mx2

Reputation: 704

Drawing with Transparent Paint on Android

When I use Paint with Color.TRANSPARENT on a normal 2D canvas in Android, I don't get any results and my intention was to get rid of some of the contents on the canvas. I mean the contents that I want to dispose of don't disappear.

This is the code for my Paint:

mPointFillPaint = new Paint();
mPointFillPaint.setColor(Color.TRANSPARENT);
mPointFillPaint.setAntiAlias(true);
mPointFillPaint.setStyle(Paint.Style.FILL);
mPointFillPaint.setStrokeJoin(Paint.Join.MITER);

Upvotes: 8

Views: 13551

Answers (2)

bko
bko

Reputation: 1208

I found that using 

mPaint.setColor(Color.TRANSPARENT);
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT));

or

mPaint.setColor(Color.TRANSPARENT);
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));

just made my paint black.

I had another approach which was to introduce a transparent color to my colors.xml

    <color name="transparentColor">#00ffffff</color>

I opted for the "00ffffff" case but i'm pretty sure that "00000000" will work also, depends on your case.

Final code looks like:

    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setColor(getResources().getColor(R.color.transparentColor));

Upvotes: 4

Ateeq Ur Rehman
Ateeq Ur Rehman

Reputation: 321

The following Paint configuration should help:

mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setColor(Color.TRANSPARENT);
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT));
mPaint.setAntiAlias(true);

Upvotes: 11

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