private void updateLabelForLayer(SliceLayer sliceLayer, nfloat value)
{
var textLayer = (CATextLayer)sliceLayer.Sublayers [1];
textLayer.Hidden = !ShowLabel;
if (!ShowLabel)
{
return;
}
String label = ShowPercentage ? sliceLayer.Percentage.ToString("P1") : sliceLayer.Value.ToString("0.00");
var nsString = new NSString(label);
CGSize size = nsString.GetSizeUsingAttributes(new UIStringAttributes()
{
Font = LabelFont
});
if (Math.PI * 2 * LabelRadius * sliceLayer.Percentage < Math.Max(size.Width, size.Height) || value <= 0)
{
textLayer.String = "";
}
else
{
textLayer.String = label;
textLayer.Bounds = new CGRect(0, 0, size.Width, size.Height);
}
}
private int containsLayer(List <SliceLayer> list, SliceLayer layer)
{
int result = -1;
for (int i = 0; i < list.Count; i++)
{
var item = list [i];
if (layer.StartAngle.CompareTo(item.StartAngle) == 0 &&
layer.EndAngle.CompareTo(item.EndAngle) == 0)
{
result = i;
}
}
return(result);
}
private SliceLayer createSliceLayer()
{
var pieLayer = new SliceLayer();
pieLayer.Frame = _pieView.Frame;
var arcLayer = new CAShapeLayer();
arcLayer.ZPosition = 0;
arcLayer.StrokeColor = null;
pieLayer.AddSublayer(arcLayer);
var textLayer = new CATextLayer();
textLayer.ContentsScale = UIScreen.MainScreen.Scale;
CGFont font = CGFont.CreateWithFontName(LabelFont.Name);
if (font != null)
{
textLayer.SetFont(font);
font.Dispose();
}
textLayer.FontSize = LabelFont.PointSize;
textLayer.AnchorPoint = new CGPoint(0.5f, 0.5f);
textLayer.AlignmentMode = CATextLayer.AlignmentCenter;
textLayer.BackgroundColor = UIColor.Clear.CGColor;
textLayer.ForegroundColor = LabelColor.CGColor;
if (LabelShadowColor != null)
{
textLayer.ShadowColor = LabelShadowColor.CGColor;
textLayer.ShadowOffset = CGSize.Empty;
textLayer.ShadowOpacity = 1.0f;
textLayer.ShadowRadius = 2.0f;
}
CGSize size = ((NSString)"0").StringSize(LabelFont);
textLayer.Frame = new CGRect(new CGPoint(0, 0), size);
textLayer.Position = new CGPoint(_pieCenter.X + LabelRadius * (nfloat)Math.Cos(0), _pieCenter.Y + LabelRadius * (nfloat)Math.Sin(0));
pieLayer.AddSublayer(textLayer);
layerPool.Add(pieLayer);
return(pieLayer);
}
private void updateLabelForLayer (SliceLayer sliceLayer, nfloat value)
{
var textLayer = (CATextLayer)sliceLayer.Sublayers [1];
textLayer.Hidden = !ShowLabel;
if (!ShowLabel) {
return;
}
String label = ShowPercentage ? sliceLayer.Percentage.ToString ("P1") : sliceLayer.Value.ToString ("0.00");
var nsString = new NSString (label);
CGSize size = nsString.GetSizeUsingAttributes (new UIStringAttributes () { Font = LabelFont });
if (Math.PI * 2 * LabelRadius * sliceLayer.Percentage < Math.Max (size.Width, size.Height) || value <= 0) {
textLayer.String = "";
} else {
textLayer.String = label;
textLayer.Bounds = new CGRect (0, 0, size.Width, size.Height);
}
}
private SliceLayer createSliceLayer ()
{
var pieLayer = new SliceLayer ();
pieLayer.Frame = _pieView.Frame;
var arcLayer = new CAShapeLayer ();
arcLayer.ZPosition = 0;
arcLayer.StrokeColor = null;
pieLayer.AddSublayer (arcLayer);
var textLayer = new CATextLayer ();
textLayer.ContentsScale = UIScreen.MainScreen.Scale;
CGFont font = CGFont.CreateWithFontName (LabelFont.Name);
if (font != null) {
textLayer.SetFont (font);
font.Dispose ();
}
textLayer.FontSize = LabelFont.PointSize;
textLayer.AnchorPoint = new CGPoint (0.5f, 0.5f);
textLayer.AlignmentMode = CATextLayer.AlignmentCenter;
textLayer.BackgroundColor = UIColor.Clear.CGColor;
textLayer.ForegroundColor = LabelColor.CGColor;
if (LabelShadowColor != null) {
textLayer.ShadowColor = LabelShadowColor.CGColor;
textLayer.ShadowOffset = CGSize.Empty;
textLayer.ShadowOpacity = 1.0f;
textLayer.ShadowRadius = 2.0f;
}
CGSize size = ((NSString)"0").StringSize (LabelFont);
textLayer.Frame = new CGRect (new CGPoint (0, 0), size);
textLayer.Position = new CGPoint (_pieCenter.X + LabelRadius * (nfloat)Math.Cos (0), _pieCenter.Y + LabelRadius * (nfloat)Math.Sin (0));
pieLayer.AddSublayer (textLayer);
layerPool.Add (pieLayer);
return pieLayer;
}
private int containsLayer ( List<SliceLayer> list, SliceLayer layer)
{
int result = -1;
for (int i = 0; i < list.Count; i++) {
var item = list [i];
if (layer.StartAngle.CompareTo ( item.StartAngle) == 0 &&
layer.EndAngle.CompareTo ( item.EndAngle) == 0) {
result = i;
}
}
return result;
}
public void ReloadData()
{
if (DataSource == null)
{
return;
}
CALayer parentLayer = _pieView.Layer;
var sliceLayers = parentLayer.Sublayers ?? new CALayer[0];
_selectedSliceIndex = -1;
for (int i = 0; i < sliceLayers.Length; i++)
{
var layer = (SliceLayer)sliceLayers [i];
if (layer.IsSelected)
{
SetSliceDeselectedAtIndex(i);
layer.Opacity = 1;
}
}
double startToAngle = 0.0f;
double endToAngle = startToAngle;
nint sliceCount = DataSource.NumberOfSlicesInPieChart(this);
nfloat sum = 0.0f;
var values = new nfloat[sliceCount];
for (nint index = 0; index < sliceCount; index++)
{
values [index] = DataSource.ValueForSliceAtIndex(this, index);
sum += values [index];
}
var angles = new nfloat[sliceCount];
for (nint index = 0; index < sliceCount; index++)
{
nfloat div;
if (sum == 0.0f)
{
div = 0;
}
else
{
div = values [index] / sum;
}
angles [index] = (nfloat)Math.PI * 2 * div;
}
_pieView.UserInteractionEnabled = false;
var layersToRemove = new List <SliceLayer> ();
bool isOnStart = (sliceLayers.Length == 0 && sliceCount > 0);
nint diff = sliceCount - sliceLayers.Length;
for (int i = 0; i < sliceLayers.Length; i++)
{
layersToRemove.Add((SliceLayer)sliceLayers [i]);
}
bool isOnEnd = (sliceLayers.Length > 0) && (sliceCount == 0 || sum <= 0);
if (isOnEnd)
{
foreach (var item in sliceLayers)
{
var layer = (SliceLayer)item;
updateLabelForLayer(layer, 0.0f);
layer.CreateArcAnimationForKey("startAngle", StartPieAngle, StartPieAngle, _animationDelegate);
layer.CreateArcAnimationForKey("endAngle", StartPieAngle, StartPieAngle, _animationDelegate);
}
return;
}
for (int index = 0; index < sliceCount; index++)
{
SliceLayer layer = null;
double angle = angles [index];
endToAngle += angle;
double startFromAngle = StartPieAngle + startToAngle;
double endFromAngle = StartPieAngle + endToAngle;
if (index >= sliceLayers.Length)
{
layer = createSliceLayer();
if (isOnStart)
{
startFromAngle = endFromAngle = StartPieAngle;
}
parentLayer.AddSublayer(layer);
diff--;
}
else
{
var onelayer = (SliceLayer)sliceLayers [index];
if (diff == 0 || onelayer.Value == values [index])
{
layer = onelayer;
layersToRemove.Remove(layer);
}
else if (diff > 0)
{
layer = createSliceLayer();
parentLayer.InsertSublayer(layer, index);
diff--;
}
else if (diff < 0)
{
while (diff < 0)
{
onelayer.RemoveFromSuperLayer();
parentLayer.AddSublayer(onelayer); // TODO: check removing this code with the new Xamarin compiler
diff++;
onelayer = (SliceLayer)sliceLayers [index];
if (onelayer.Value == values [index] || diff == 0)
{
layer = onelayer;
layersToRemove.Remove(layer);
break;
}
}
}
}
layer.Value = values [index];
layer.Percentage = (sum > 0) ? layer.Value / sum : 0;
UIColor color;
if (DataSource.ColorForSliceAtIndex(this, index) != null)
{
color = DataSource.ColorForSliceAtIndex(this, index);
}
else
{
color = UIColor.FromHSBA((nfloat)(index / 8f % 20.0f / 20.0 + 0.02f), (nfloat)((index % 8 + 3) / 10.0), (nfloat)(91 / 100.0), 1);
}
layer.ChangeToColor(color);
if (!String.IsNullOrEmpty(DataSource.TextForSliceAtIndex(this, index)))
{
layer.Text = DataSource.TextForSliceAtIndex(this, index);
}
updateLabelForLayer(layer, values [index]);
layer.CreateArcAnimationForKey("startAngle", startFromAngle, startToAngle + StartPieAngle, _animationDelegate);
layer.CreateArcAnimationForKey("endAngle", endFromAngle, endToAngle + StartPieAngle, _animationDelegate);
startToAngle = endToAngle;
}
foreach (var layer in layersToRemove)
{
var shapeLayer = (CAShapeLayer)layer.Sublayers [0];
layerPool.Remove(layer);
shapeLayer.FillColor = PieBackgroundColor.CGColor;
shapeLayer.Path.Dispose();
layer.Delegate = null;
layer.ZPosition = 0;
layer.Sublayers [1].Hidden = true;
layer.RemoveFromSuperLayer();
}
layersToRemove.Clear();
foreach (var layer in sliceLayers)
{
layer.ZPosition = defaultSliceZOrder;
}
_pieView.UserInteractionEnabled = true;
}