protected override void drawChart(CanvasDrawingSession canvas)
{
if (chartData == null)
{
return;
}
int transitionAlpha = 255;
//canvas.save();
if (transitionMode == TRANSITION_MODE_CHILD)
{
transitionAlpha = (int)(transitionParams.progress * transitionParams.progress * 255);
canvas.Transform = Matrix3x2.CreateScale(
new Vector2(transitionParams.progress, transitionParams.progress),
new Vector2(chartArea.centerX(), chartArea.centerY())
);
}
if (isEmpty)
{
if (emptyDataAlpha != 0)
{
emptyDataAlpha -= 0.12f;
if (emptyDataAlpha < 0)
{
emptyDataAlpha = 0;
}
invalidate();
}
}
else
{
if (emptyDataAlpha != 1f)
{
emptyDataAlpha += 0.12f;
if (emptyDataAlpha > 1f)
{
emptyDataAlpha = 1f;
}
invalidate();
}
}
transitionAlpha = (int)(transitionAlpha * emptyDataAlpha);
float sc = 0.4f + emptyDataAlpha * 0.6f;
canvas.Transform = Matrix3x2.CreateScale(
new Vector2(sc, sc),
new Vector2(chartArea.centerX(), chartArea.centerY())
);
int radius = (int)((chartArea.Width > chartArea.Height ? chartArea.Height : chartArea.Width) * 0.45f);
rectF = createRect(
chartArea.centerX() - radius,
chartArea.centerY() + 16 - radius,
chartArea.centerX() + radius,
chartArea.centerY() + 16 + radius
);
float a = -90f;
float rText;
int n = lines.Count;
float localSum = 0f;
for (int i = 0; i < n; i++)
{
float v = lines[i].drawingPart * lines[i].alpha;
localSum += v;
}
if (localSum == 0)
{
//canvas.restore();
return;
}
for (int i = 0; i < n; i++)
{
if (lines[i].alpha <= 0 && !lines[i].enabled)
{
continue;
}
lines[i].paint.A = (byte)transitionAlpha;
float currentPercent = lines[i].drawingPart / localSum * lines[i].alpha;
darawingValuesPercentage[i] = currentPercent;
if (currentPercent == 0)
{
continue;
}
//canvas.save();
double textAngle = a + (currentPercent / 2f) * 360f;
if (lines[i].selectionA > 0f)
{
float ai = INTERPOLATOR.getInterpolation(lines[i].selectionA);
canvas.Transform = Matrix3x2.CreateTranslation(
(float)(Math.Cos(MathEx.ToRadians(textAngle)) * 8 * ai),
(float)(Math.Sin(MathEx.ToRadians(textAngle)) * 8 * ai)
);
}
//lines[i].paint.setStyle(Paint.Style.FILL_AND_STROKE);
lines[i].paint.StrokeWidth = 1;
//lines[i].paint.setAntiAlias(!USE_LINES);
//canvas.drawArc(
// rectF,
// a,
// (currentPercent) * 360f,
// true,
// lines[i].paint);
var b = a + (currentPercent) * 360f;
var builder = new CanvasPathBuilder(canvas);
var center = new Vector2((float)rectF.X + (float)rectF.Width / 2, (float)rectF.Y + (float)rectF.Height / 2);
builder.BeginFigure(center);
builder.AddLine(
new Vector2(
(float)(center.X + Math.Sin(a * Math.PI / 180) * (float)rectF.Width / 2),
(float)(center.Y - Math.Cos(a * Math.PI / 180) * (float)rectF.Height / 2)));
builder.AddArc(
new Vector2(
(float)(center.X + Math.Sin(b * Math.PI / 180) * (float)rectF.Width / 2),
(float)(center.Y - Math.Cos(b * Math.PI / 180) * (float)rectF.Height / 2)),
(float)rectF.Width / 2,
(float)rectF.Height / 2,
0, CanvasSweepDirection.Clockwise,
(b - a) >= 180.0 ? CanvasArcSize.Large : CanvasArcSize.Small);
builder.EndFigure(CanvasFigureLoop.Closed);
canvas.FillGeometry(CanvasGeometry.CreatePath(builder), lines[i].paint.Color);
//lines[i].paint.setStyle(Paint.Style.STROKE);
//canvas.restore();
canvas.Transform = Matrix3x2.Identity;
lines[i].paint.A = 255;
a += currentPercent * 360f;
}
a = -90f;
for (int i = 0; i < n; i++)
{
if (lines[i].alpha <= 0 && !lines[i].enabled)
{
continue;
}
float currentPercent = (lines[i].drawingPart * lines[i].alpha / localSum);
//canvas.save();
double textAngle = a + (currentPercent / 2f) * 360f;
if (lines[i].selectionA > 0f)
{
float ai = INTERPOLATOR.getInterpolation(lines[i].selectionA);
canvas.Transform = Matrix3x2.CreateTranslation(
(float)(Math.Cos(MathEx.ToRadians(textAngle)) * 8 * ai),
(float)(Math.Sin(MathEx.ToRadians(textAngle)) * 8 * ai)
);
}
int percent = (int)(100f * currentPercent);
if (currentPercent >= 0.02f && percent > 0 && percent <= 100)
{
rText = (float)(rectF.Width * 0.42f * Math.Sqrt(1f - currentPercent));
//textPaint.setTextSize(MIN_TEXT_SIZE + currentPercent * MAX_TEXT_SIZE);
//textPaint.setAlpha((int)(transitionAlpha * lines[i].alpha));
//canvas.DrawText(
// lookupTable[percent],
// (float)(rectF.centerX() + rText * Math.Cos(MathEx.ToRadians(textAngle))),
// (float)(rectF.centerY() + rText * Math.Sin(MathEx.ToRadians(textAngle))) - ((textPaint.descent() + textPaint.ascent()) / 2),
// textPaint);
}
//canvas.restore();
canvas.Transform = Matrix3x2.Identity;
lines[i].paint.A = 255;
a += currentPercent * 360f;
}
//canvas.restore();
canvas.Transform = Matrix3x2.Identity;
}