ISSUE:
When using multiple LineDataSets like the follows:
int solidColor = 0xFFFF00FF;
dataSet.setColor(solidColor);
dataSet.setCircleColor(solidColor);
int semiTransparentColor = 0x8A000000;
fadedSet.setColor(semiTransparentColor);
LineData data = new LineData(dataSet, fadedSet);
the circles in 'dataSet' will rendered with the alpha from
fadedSet (0x8A).
The reason for this is that mRenderPaint is not reset properly
before drawing the circles. The first time drawCircles is called
the imageCache.fill(...) method is used where the color is set by
mRenderPaint.setColor(set.getCircleColor(i)), restoring the alpha
to 0xFF. The second time homever, imageCache.fill(...) is not called
which means that mRenderPaint will use it's old color/alpha,
which in this case is from fadedSet.
TEST INFO:
To trigger the issue, add the following to LineChartActivity1:
final ArrayList<Entry> fadedEntries = new ArrayList<>();
for (int i = 0; i < count; i++) {
float val = (float) (Math.random() * range) + 3;
fadedEntries.add(new Entry(i, val));
}
final LineDataSet fadedDateSet = new LineDataSet(fadedEntries, "Faded");
fadedDateSet.setColor(0x42000000);
dataSets.add(fadedDateSet); // add the datasets
and launch the first item in the example app.
SOLUTION:
This commit replaces mRenderPaint with null when drawing the circle
bitmap. If circleColor has been defined with a semi-transparent
color, it will be drawn that way in the cached bitmap, hence the the
bitmap itself does not need to be drawn with an alpha.
The default text size in ComponentBase was defined as 10 pixels
instead of 10dp, which causes tiny text and does not reflect
the javadoc and the general behavior of setTextSize(...)
It's the Android's renderer's bug.
When specifying exact clipping rects,
they are clipping more than they should!
So drawing a thin 1px line on the edge of a clipping rect fail.
Instead of insetting by half the line width, inset by full line width.
