Question

Using Android canvas draw commands:

If I set stroke = 0 or stroke =1 and draw horizontal line, the line pixels are two pixels high. If I set stroke = 2, the pixels are also two pixels high but are brighter.

If I draw single pixels, the pixels are a 2×2 matrix for stroke = 0 or stroke = 1. If the stroke = 2, I also get a 2×2 matrix but with brighter pixels.

What must I do to get lines that are only one pixel tall?
What must I do to get pixels that are one and only pixel?

Note: The devices that am using have screen sizes of 480 x 800 or greater.

Paint thePaint = new Paint();                   
thePaint.setARGB(a, r, g, b);                           
thePaint.setAntiAlias(true);
thePaint.setStyle(Paint.Style.FILL );
thePaint.setStrokeWidth(0);
canvas.drawLine(x1,y1,x2,y2, thePaint);

Answer 1

I communicated with The Roman Guy @Google about this issue. He said the AntiAlias need to be turned off in addition of setting stroke = 0. My testing showed that he is right. The Google documentation does not current reflect this requirement. This code works.

Paint thePaint = new Paint();                   
thePaint.setARGB(a, r, g, b);                           
thePaint.setAntiAlias(false);
thePaint.setStyle(Paint.Style.STROKE );
thePaint.setStrokeWidth(0);
canvas.drawLine(x1,y1,x2,y2, thePaint);