/// <summary>
/// Adjust areas rectangle coordinate to fit the 3D border
/// </summary>
/// <param name="graph">Graphics to draw the border on.</param>
/// <param name="areasRect">Position to adjust.</param>
public virtual void AdjustAreasPosition(ChartGraphics graph, ref SKRect areasRect)
{
SKSize relSizeLeftTop = new(sizeLeftTop.Width, sizeLeftTop.Height);
SKSize relSizeRightBottom = new(sizeRightBottom.Width, sizeRightBottom.Height);
relSizeLeftTop.Width += defaultRadiusSize * 0.7f;
relSizeLeftTop.Height += defaultRadiusSize * 0.85f;
relSizeRightBottom.Width += defaultRadiusSize * 0.7f;
relSizeRightBottom.Height += defaultRadiusSize * 0.7f;
relSizeLeftTop = graph.GetRelativeSize(relSizeLeftTop);
relSizeRightBottom = graph.GetRelativeSize(relSizeRightBottom);
if (relSizeLeftTop.Width > 30f)
{
relSizeLeftTop.Width = 0;
}
if (relSizeLeftTop.Height > 30f)
{
relSizeLeftTop.Height = 0;
}
if (relSizeRightBottom.Width > 30f)
{
relSizeRightBottom.Width = 0;
}
if (relSizeRightBottom.Height > 30f)
{
relSizeRightBottom.Height = 0;
}
areasRect.Left += relSizeLeftTop.Width;
areasRect.Right -= Math.Min(areasRect.Width, relSizeLeftTop.Width + relSizeRightBottom.Width);
areasRect.Top += relSizeLeftTop.Height;
areasRect.Bottom -= Math.Min(areasRect.Height, relSizeLeftTop.Height + relSizeRightBottom.Height);
if (areasRect.Right > 100f)
{
if (areasRect.Width > 100f - areasRect.Right)
{
areasRect.Right -= 100f - areasRect.Right;
}
else
{
areasRect.Left -= 100f - areasRect.Right;
}
}
if (areasRect.Bottom > 100f)
{
if (areasRect.Height > 100f - areasRect.Bottom)
{
areasRect.Bottom -= 100f - areasRect.Bottom;
}
else
{
areasRect.Top -= 100f - areasRect.Bottom;
}
}
}
/// <summary>
/// Adjust areas rectangle coordinate to fit the 3D border.
/// </summary>
/// <param name="graph">Graphics to draw the border on.</param>
/// <param name="areasRect">Position to adjust.</param>
public virtual void AdjustAreasPosition(ChartGraphics graph, ref SKRect areasRect)
{
SKSize borderSize = new(defaultRadiusSize / 2f, defaultRadiusSize / 2f);
borderSize = graph.GetRelativeSize(borderSize);
// Do not do anything if rectangle is too small
if (borderSize.Width < 30f)
{
areasRect.Top += borderSize.Width;
areasRect.Right -= Math.Min(areasRect.Width, borderSize.Width * 2.5f);
}
if (borderSize.Height < 30f)
{
areasRect.Top += borderSize.Height;
areasRect.Bottom -= Math.Min(areasRect.Height, borderSize.Height * 2.5f);
}
if (areasRect.Left + areasRect.Width > 100f)
{
areasRect.Left -= 100f - areasRect.Width;
}
if (areasRect.Top + areasRect.Height > 100f)
{
areasRect.Top -= 100f - areasRect.Height;
}
}
/// <summary>
/// Paint FastLine Chart.
/// </summary>
/// <param name="graph">The Chart Graphics object.</param>
/// <param name="common">The Common elements object.</param>
/// <param name="area">Chart area for this chart.</param>
/// <param name="seriesToDraw">Chart series to draw.</param>
virtual public void Paint(
ChartGraphics graph,
CommonElements common,
ChartArea area,
Series seriesToDraw)
{
Common = common;
Graph = graph;
bool clipRegionSet = false;
if (area.Area3DStyle.Enable3D)
{
// Initialize variables
chartArea3DEnabled = true;
matrix3D = area.matrix3D;
}
else
{
chartArea3DEnabled = false;
}
//************************************************************
//** Loop through all series
//************************************************************
foreach (Series series in common.DataManager.Series)
{
// Process non empty series of the area with FastLine chart type
if (string.Compare(series.ChartTypeName, Name, true, System.Globalization.CultureInfo.CurrentCulture) != 0 ||
series.ChartArea != area.Name ||
!series.IsVisible())
{
continue;
}
// Get 3D series depth and Z position
if (chartArea3DEnabled)
{
area.GetSeriesZPositionAndDepth(series, out float seriesDepth, out seriesZCoordinate);
seriesZCoordinate += seriesDepth / 2.0f;
}
// Set active horizontal/vertical axis
Axis hAxis = area.GetAxis(AxisName.X, series.XAxisType, (area.Area3DStyle.Enable3D) ? string.Empty : Series.XSubAxisName);
Axis vAxis = area.GetAxis(AxisName.Y, series.YAxisType, (area.Area3DStyle.Enable3D) ? string.Empty : Series.YSubAxisName);
double hAxisMin = hAxis.ViewMinimum;
double hAxisMax = hAxis.ViewMaximum;
double vAxisMin = vAxis.ViewMinimum;
double vAxisMax = vAxis.ViewMaximum;
// Get "PermittedPixelError" attribute
float permittedPixelError = 1.0f;
if (series.IsCustomPropertySet(CustomPropertyName.PermittedPixelError))
{
string attrValue = series[CustomPropertyName.PermittedPixelError];
bool parseSucceed = float.TryParse(attrValue, NumberStyles.Any, CultureInfo.CurrentCulture, out float pixelError);
if (parseSucceed)
{
permittedPixelError = pixelError;
}
else
{
throw (new InvalidOperationException(SR.ExceptionCustomAttributeValueInvalid2("PermittedPixelError")));
}
// "PermittedPixelError" attribute value should be in range from zero to 1
if (permittedPixelError < 0f || permittedPixelError > 1f)
{
throw (new InvalidOperationException(SR.ExceptionCustomAttributeIsNotInRange0to1("PermittedPixelError")));
}
}
// Get pixel size in axes coordinates
SKSize pixelSize = graph.GetRelativeSize(new SKSize(permittedPixelError, permittedPixelError));
SKSize axesMin = graph.GetRelativeSize(new SKSize((float)hAxisMin, (float)vAxisMin));
double axesValuesPixelSizeX = Math.Abs(hAxis.PositionToValue(axesMin.Width + pixelSize.Width, false) - hAxis.PositionToValue(axesMin.Width, false));
// Create line pen
SKPaint linePen = new() { Color = series.Color, StrokeWidth = series.BorderWidth };
linePen.PathEffect = ChartGraphics.GetPenStyle(series.BorderDashStyle, series.BorderWidth);
linePen.StrokeCap = SKStrokeCap.Round;
// Create empty line pen
SKPaint emptyLinePen = new() { Style = SKPaintStyle.Stroke, Color = series.EmptyPointStyle.Color, StrokeWidth = series.EmptyPointStyle.BorderWidth };
emptyLinePen.PathEffect = ChartGraphics.GetPenStyle(series.EmptyPointStyle.BorderDashStyle, series.EmptyPointStyle.BorderWidth);
emptyLinePen.StrokeCap = SKStrokeCap.Round;
// Check if series is indexed
bool indexedSeries = ChartHelper.IndexedSeries(Common, series.Name);
// Loop through all ponts in the series
int index = 0;
double yValueRangeMin = double.NaN;
double yValueRangeMax = double.NaN;
DataPoint pointRangeMin = null;
DataPoint pointRangeMax = null;
double xValue = 0;
double yValue = 0;
double xValuePrev = 0;
double yValuePrev = 0;
DataPoint prevDataPoint = null;
SKPoint lastVerticalSegmentPoint = SKPoint.Empty;
SKPoint prevPoint = SKPoint.Empty;
SKPoint currentPoint = SKPoint.Empty;
bool prevPointInAxesCoordinates = false;
bool verticalLineDetected = false;
bool prevPointIsEmpty = false;
bool currentPointIsEmpty = false;
bool firstNonEmptyPoint = false;
double xPixelConverter = (graph.Common.ChartPicture.Width - 1.0) / 100.0;
double yPixelConverter = (graph.Common.ChartPicture.Height - 1.0) / 100.0;
foreach (DataPoint point in series.Points)
{
// Get point X and Y values
xValue = (indexedSeries) ? index + 1 : point.XValue;
xValue = hAxis.GetLogValue(xValue);
yValue = vAxis.GetLogValue(point.YValues[0]);
currentPointIsEmpty = point.IsEmpty;
// NOTE: Fixes issue #7094
// If current point is non-empty but the previous one was,
// use empty point style properties to draw it.
if (prevPointIsEmpty && !currentPointIsEmpty && !firstNonEmptyPoint)
{
firstNonEmptyPoint = true;
currentPointIsEmpty = true;
}
else
{
firstNonEmptyPoint = false;
}
// Check if line is completly out of the data scaleView
if (!verticalLineDetected &&
((xValue < hAxisMin && xValuePrev < hAxisMin) ||
(xValue > hAxisMax && xValuePrev > hAxisMax) ||
(yValue < vAxisMin && yValuePrev < vAxisMin) ||
(yValue > vAxisMax && yValuePrev > vAxisMax)))
{
xValuePrev = xValue;
yValuePrev = yValue;
prevPointInAxesCoordinates = true;
++index;
continue;
}
else if (!clipRegionSet && (xValuePrev < hAxisMin || xValuePrev > hAxisMax ||
xValue > hAxisMax || xValue < hAxisMin ||
yValuePrev < vAxisMin || yValuePrev > vAxisMax ||
yValue < vAxisMin || yValue > vAxisMax))
{
// Set clipping region for line drawing
graph.SetClip(area.PlotAreaPosition.ToSKRect());
clipRegionSet = true;
}
// Check if point may be skipped
// Check if points X value in acceptable error boundary
if (index > 0 &&
currentPointIsEmpty == prevPointIsEmpty && Math.Abs(xValue - xValuePrev) < axesValuesPixelSizeX)
{
if (!verticalLineDetected)
{
verticalLineDetected = true;
if (yValue > yValuePrev)
{
yValueRangeMax = yValue;
yValueRangeMin = yValuePrev;
pointRangeMax = point;
pointRangeMin = prevDataPoint;
}
else
{
yValueRangeMax = yValuePrev;
yValueRangeMin = yValue;
pointRangeMax = prevDataPoint;
pointRangeMin = point;
}
}
else
{
if (yValue > yValueRangeMax)
{
yValueRangeMax = yValue;
pointRangeMax = point;
}
else if (yValue < yValueRangeMin)
{
yValueRangeMin = yValue;
pointRangeMin = point;
}
}
// Remember last point
prevDataPoint = point;
// Remember last vertical range point
// Note! Point is in axes coordinate.
lastVerticalSegmentPoint.Y = (float)yValue;
// Increase counter and proceed to next data point
++index;
continue;
}
// Get point pixel position
currentPoint.X = (float)
(hAxis.GetLinearPosition(xValue) * xPixelConverter);
currentPoint.Y = (float)
(vAxis.GetLinearPosition(yValue) * yPixelConverter);
// Check if previous point must be converted from axes values to pixels
if (prevPointInAxesCoordinates)
{
prevPoint.X = (float)
(hAxis.GetLinearPosition(xValuePrev) * xPixelConverter);
prevPoint.Y = (float)
(vAxis.GetLinearPosition(yValuePrev) * yPixelConverter);
}
// Draw accumulated vertical line (with minimal X values differences)
if (verticalLineDetected)
{
// Convert Y coordinates to pixels
yValueRangeMin = (vAxis.GetLinearPosition(yValueRangeMin) * yPixelConverter);
yValueRangeMax = (vAxis.GetLinearPosition(yValueRangeMax) * yPixelConverter);
// Draw accumulated vertical line
DrawLine(
series,
prevDataPoint,
pointRangeMin,
pointRangeMax,
index,
(prevPointIsEmpty) ? emptyLinePen : linePen,
prevPoint.X,
(float)yValueRangeMin,
prevPoint.X,
(float)yValueRangeMax);
// Reset vertical line detected flag
verticalLineDetected = false;
// Convert last point of the vertical line segment to pixel coordinates
prevPoint.Y = (float)
(vAxis.GetLinearPosition(lastVerticalSegmentPoint.Y) * yPixelConverter);
}
// Draw line from previous to current point
if (index > 0)
{
DrawLine(
series,
point,
pointRangeMin,
pointRangeMax,
index,
(currentPointIsEmpty) ? emptyLinePen : linePen,
prevPoint.X,
prevPoint.Y,
currentPoint.X,
currentPoint.Y);
}
// Remember last point coordinates
xValuePrev = xValue;
yValuePrev = yValue;
prevDataPoint = point;
prevPoint = currentPoint;
prevPointInAxesCoordinates = false;
prevPointIsEmpty = currentPointIsEmpty;
++index;
}
// Draw last accumulated line segment
if (verticalLineDetected)
{
// Check if previous point must be converted from axes values to pixels
if (prevPointInAxesCoordinates)
{
prevPoint.X = (float)
(hAxis.GetLinearPosition(xValuePrev) * xPixelConverter);
prevPoint.Y = (float)
(vAxis.GetLinearPosition(yValuePrev) * yPixelConverter);
}
// Convert Y coordinates to pixels
yValueRangeMin = (vAxis.GetLinearPosition(yValueRangeMin) * yPixelConverter);
yValueRangeMax = (vAxis.GetLinearPosition(yValueRangeMax) * yPixelConverter);
// Draw accumulated vertical line
DrawLine(
series,
prevDataPoint,
pointRangeMin,
pointRangeMax,
index - 1,
prevPointIsEmpty ? emptyLinePen : linePen,
prevPoint.X,
(float)yValueRangeMin,
prevPoint.X,
(float)yValueRangeMax);
}
}
// Reset Clip Region
if (clipRegionSet)
{
graph.ResetClip();
}
}
/// <summary>
/// Paint FastPoint Chart.
/// </summary>
/// <param name="graph">The Chart Graphics object.</param>
/// <param name="common">The Common elements object.</param>
/// <param name="area">Chart area for this chart.</param>
/// <param name="seriesToDraw">Chart series to draw.</param>
virtual public void Paint(
ChartGraphics graph,
CommonElements common,
ChartArea area,
Series seriesToDraw)
{
Common = common;
Graph = graph;
if (area.Area3DStyle.Enable3D)
{
// Initialize variables
chartArea3DEnabled = true;
matrix3D = area.matrix3D;
}
else
{
chartArea3DEnabled = false;
}
//************************************************************
//** Loop through all series
//************************************************************
foreach (Series series in common.DataManager.Series)
{
// Process non empty series of the area with FastPoint chart type
if (String.Compare(series.ChartTypeName, Name, true, System.Globalization.CultureInfo.CurrentCulture) != 0 ||
series.ChartArea != area.Name ||
!series.IsVisible())
{
continue;
}
// Get 3D series depth and Z position
if (chartArea3DEnabled)
{
area.GetSeriesZPositionAndDepth(series, out float seriesDepth, out seriesZCoordinate);
seriesZCoordinate += seriesDepth / 2.0f;
}
// Set active horizontal/vertical axis
Axis hAxis = area.GetAxis(AxisName.X, series.XAxisType, (area.Area3DStyle.Enable3D) ? string.Empty : Series.XSubAxisName);
Axis vAxis = area.GetAxis(AxisName.Y, series.YAxisType, (area.Area3DStyle.Enable3D) ? string.Empty : Series.YSubAxisName);
double hAxisMin = hAxis.ViewMinimum;
double hAxisMax = hAxis.ViewMaximum;
double vAxisMin = vAxis.ViewMinimum;
double vAxisMax = vAxis.ViewMaximum;
// Get "PermittedPixelError" attribute.
// By default use 1/3 of the marker size.
float permittedPixelError = series.MarkerSize / 3f;
if (series.IsCustomPropertySet(CustomPropertyName.PermittedPixelError))
{
string attrValue = series[CustomPropertyName.PermittedPixelError];
bool parseSucceed = float.TryParse(attrValue, NumberStyles.Any, CultureInfo.CurrentCulture, out float pixelError);
if (parseSucceed)
{
permittedPixelError = pixelError;
}
else
{
throw (new InvalidOperationException(SR.ExceptionCustomAttributeValueInvalid2("PermittedPixelError")));
}
// "PermittedPixelError" attribute value should be in range from zero to 1
if (permittedPixelError < 0f || permittedPixelError > 1f)
{
throw (new InvalidOperationException(SR.ExceptionCustomAttributeIsNotInRange0to1("PermittedPixelError")));
}
}
// Get pixel size in axes coordinates
SKSize pixelSize = graph.GetRelativeSize(new SKSize(permittedPixelError, permittedPixelError));
SKSize axesMin = graph.GetRelativeSize(new SKSize((float)hAxisMin, (float)vAxisMin));
double axesValuesPixelSizeX = Math.Abs(hAxis.PositionToValue(axesMin.Width + pixelSize.Width, false) - hAxis.PositionToValue(axesMin.Width, false));
double axesValuesPixelSizeY = Math.Abs(vAxis.PositionToValue(axesMin.Height + pixelSize.Height, false) - vAxis.PositionToValue(axesMin.Height, false));
// Create point marker brush
SKPaint markerBrush = new() { Color = (series.MarkerColor == SKColor.Empty) ? series.Color : series.MarkerColor, Style = SKPaintStyle.Fill };
SKPaint emptyMarkerBrush = new() { Color = (series.EmptyPointStyle.MarkerColor == SKColor.Empty) ? series.EmptyPointStyle.Color : series.EmptyPointStyle.MarkerColor, Style = SKPaintStyle.Fill };
// Create point marker border pen
SKPaint borderPen = null;
SKPaint emptyBorderPen = null;
if (series.MarkerBorderColor != SKColor.Empty && series.MarkerBorderWidth > 0)
{
borderPen = new SKPaint()
{
Style = SKPaintStyle.Stroke, Color = series.MarkerBorderColor, StrokeWidth = series.MarkerBorderWidth
};
}
if (series.EmptyPointStyle.MarkerBorderColor != SKColor.Empty && series.EmptyPointStyle.MarkerBorderWidth > 0)
{
emptyBorderPen = new SKPaint()
{
Style = SKPaintStyle.Stroke, Color = series.EmptyPointStyle.MarkerBorderColor, StrokeWidth = series.EmptyPointStyle.MarkerBorderWidth
};
}
// Check if series is indexed
bool indexedSeries = ChartHelper.IndexedSeries(Common, series.Name);
// Get marker size taking in consideration current DPIs
int markerSize = series.MarkerSize;
if (graph != null && graph.Graphics != null)
{
// Marker size is in pixels and we do the mapping for higher DPIs
markerSize = Math.Max(markerSize, markerSize);
}
// Loop through all ponts in the series
int index = 0;
double xValuePrev = 0.0;
double yValuePrev = 0.0;
SKPoint currentPoint = SKPoint.Empty;
double xPixelConverter = (graph.Common.ChartPicture.Width - 1.0) / 100.0;
double yPixelConverter = (graph.Common.ChartPicture.Height - 1.0) / 100.0;
MarkerStyle markerStyle = series.MarkerStyle;
MarkerStyle emptyMarkerStyle = series.EmptyPointStyle.MarkerStyle;
foreach (DataPoint point in series.Points)
{
// Get point X and Y values
double xValue = (indexedSeries) ? index + 1 : point.XValue;
xValue = hAxis.GetLogValue(xValue);
double yValue = vAxis.GetLogValue(point.YValues[0]);
bool currentPointIsEmpty = point.IsEmpty;
// Check if point is completly out of the data scaleView
if (xValue < hAxisMin ||
xValue > hAxisMax ||
yValue < vAxisMin ||
yValue > vAxisMax)
{
xValuePrev = xValue;
yValuePrev = yValue;
++index;
continue;
}
// Check if point may be skipped
if (index > 0 && Math.Abs(xValue - xValuePrev) < axesValuesPixelSizeX &&
Math.Abs(yValue - yValuePrev) < axesValuesPixelSizeY)
{
// Increase counter and proceed to the next data point
++index;
continue;
}
// Get point pixel position
currentPoint.X = (float)
(hAxis.GetLinearPosition(xValue) * xPixelConverter);
currentPoint.Y = (float)
(vAxis.GetLinearPosition(yValue) * yPixelConverter);
// Draw point marker
MarkerStyle currentMarkerStyle = (currentPointIsEmpty) ? emptyMarkerStyle : markerStyle;
if (currentMarkerStyle != MarkerStyle.None)
{
this.DrawMarker(
graph,
point,
index,
currentPoint,
currentMarkerStyle,
markerSize,
(currentPointIsEmpty) ? emptyMarkerBrush : markerBrush,
(currentPointIsEmpty) ? emptyBorderPen : borderPen);
}
// Remember last point coordinates
xValuePrev = xValue;
yValuePrev = yValue;
++index;
}
// Dispose used brushes and pens
markerBrush.Dispose();
emptyMarkerBrush.Dispose();
if (borderPen != null)
{
borderPen.Dispose();
}
if (emptyBorderPen != null)
{
emptyBorderPen.Dispose();
}
}
}
/// <summary>
/// Draws 3D button in the scroll bar
/// </summary>
/// <param name="graph">Chart graphics.</param>
/// <param name="buttonRect">Button position.</param>
/// <param name="pressedState">Indicates that button is pressed.</param>
/// <param name="buttonType">Button type to draw.</param>
internal void PaintScrollBar3DButton(
ChartGraphics graph,
SKRect buttonRect,
bool pressedState,
ScrollBarButtonType buttonType)
{
// Page Up/Down buttons do not require drawing
if (buttonType == ScrollBarButtonType.LargeIncrement || buttonType == ScrollBarButtonType.LargeDecrement)
{
return;
}
// Get 3 levels of colors for button drawing
var darkerColor = ChartGraphics.GetGradientColor(_buttonCurrentColor, SKColors.Black, 0.5);
var darkestColor = ChartGraphics.GetGradientColor(_buttonCurrentColor, SKColors.Black, 0.8);
var lighterColor = ChartGraphics.GetGradientColor(_buttonCurrentColor, SKColors.White, 0.5);
// Fill button rectangle background
graph.FillRectangleRel(
buttonRect,
_buttonCurrentColor,
ChartHatchStyle.None,
"",
ChartImageWrapMode.Tile,
SKColor.Empty,
ChartImageAlignmentStyle.Center,
GradientStyle.None,
SKColor.Empty,
darkerColor,
(pressedState) ? 1 : 0,
ChartDashStyle.Solid,
SKColor.Empty,
0,
PenAlignment.Outset);
// Check if 2 or 1 pixel border will be drawn (if size too small)
bool singlePixelBorder = Size <= 12;
// Draw 3D effect around the button when not pressed
if (!pressedState)
{
// Get relative size of 1 pixel
SKSize pixelRelativeSize = new(1, 1);
pixelRelativeSize = graph.GetRelativeSize(pixelRelativeSize);
// Draw top/left border with button color
graph.DrawLineRel(
(singlePixelBorder) ? lighterColor : _buttonCurrentColor, 1, ChartDashStyle.Solid,
new SKPoint(buttonRect.Left, buttonRect.Bottom),
new SKPoint(buttonRect.Left, buttonRect.Top));
graph.DrawLineRel(
(singlePixelBorder) ? lighterColor : _buttonCurrentColor, 1, ChartDashStyle.Solid,
new SKPoint(buttonRect.Left, buttonRect.Top),
new SKPoint(buttonRect.Right, buttonRect.Top));
// Draw right/bottom border with the darkest color
graph.DrawLineRel(
(singlePixelBorder) ? darkerColor : darkestColor, 1, ChartDashStyle.Solid,
new SKPoint(buttonRect.Right, buttonRect.Bottom),
new SKPoint(buttonRect.Right, buttonRect.Top));
graph.DrawLineRel(
(singlePixelBorder) ? darkerColor : darkestColor, 1, ChartDashStyle.Solid,
new SKPoint(buttonRect.Left, buttonRect.Bottom),
new SKPoint(buttonRect.Right, buttonRect.Bottom));
if (!singlePixelBorder)
{
// Draw right/bottom border (offset 1) with the dark color
graph.DrawLineRel(
darkerColor, 1, ChartDashStyle.Solid,
new SKPoint(buttonRect.Right - pixelRelativeSize.Width, buttonRect.Bottom - pixelRelativeSize.Height),
new SKPoint(buttonRect.Right - pixelRelativeSize.Width, buttonRect.Top + pixelRelativeSize.Height));
graph.DrawLineRel(
darkerColor, 1, ChartDashStyle.Solid,
new SKPoint(buttonRect.Left + pixelRelativeSize.Width, buttonRect.Bottom - pixelRelativeSize.Height),
new SKPoint(buttonRect.Right - pixelRelativeSize.Width, buttonRect.Bottom - pixelRelativeSize.Height));
// Draw top/left border (offset 1) with lighter color
graph.DrawLineRel(
lighterColor, 1, ChartDashStyle.Solid,
new SKPoint(buttonRect.Left + pixelRelativeSize.Width, buttonRect.Bottom - pixelRelativeSize.Height),
new SKPoint(buttonRect.Left + pixelRelativeSize.Width, buttonRect.Top + pixelRelativeSize.Height));
graph.DrawLineRel(
lighterColor, 1, ChartDashStyle.Solid,
new SKPoint(buttonRect.Left + pixelRelativeSize.Width, buttonRect.Left + pixelRelativeSize.Height),
new SKPoint(buttonRect.Right - pixelRelativeSize.Width, buttonRect.Left + pixelRelativeSize.Height));
}
}
// Check axis orientation
bool verticalAxis = (axis.AxisPosition == AxisPosition.Left ||
axis.AxisPosition == AxisPosition.Right);
// Set graphics transformation for button pressed mode
float pressedShifting = (singlePixelBorder) ? 0.5f : 1f;
if (pressedState)
{
graph.TranslateTransform(pressedShifting, pressedShifting);
}
// Draw button image
SKRect buttonAbsRect = graph.GetAbsoluteRectangle(buttonRect);
float imageOffset = (singlePixelBorder) ? 2 : 3;
switch (buttonType)
{
case (ScrollBarButtonType.SmallDecrement):
{
// Calculate triangal points position
SKPoint[] points = new SKPoint[3];
if (verticalAxis)
{
points[0].X = buttonAbsRect.Left + imageOffset;
points[0].Y = buttonAbsRect.Top + (imageOffset + 1f);
points[1].X = buttonAbsRect.Left + buttonAbsRect.Width / 2f;
points[1].Y = buttonAbsRect.Bottom - imageOffset;
points[2].X = buttonAbsRect.Right - imageOffset;
points[2].Y = buttonAbsRect.Top + (imageOffset + 1f);
}
else
{
points[0].X = buttonAbsRect.Left + imageOffset;
points[0].Y = buttonAbsRect.Top + buttonAbsRect.Height / 2f;
points[1].X = buttonAbsRect.Right - (imageOffset + 1f);
points[1].Y = buttonAbsRect.Top + imageOffset;
points[2].X = buttonAbsRect.Right - (imageOffset + 1f);
points[2].Y = buttonAbsRect.Bottom - imageOffset;
}
using var brush = new SKPaint { Style = SKPaintStyle.Fill, Color = _lineCurrentColor };
graph.FillPolygon(brush, points);
break;
}
case (ScrollBarButtonType.SmallIncrement):
{
// Calculate triangal points position
SKPoint[] points = new SKPoint[3];
if (verticalAxis)
{
points[0].X = buttonAbsRect.Left + imageOffset;
points[0].Y = buttonAbsRect.Bottom - (imageOffset + 1f);
points[1].X = buttonAbsRect.Left + buttonAbsRect.Width / 2f;
points[1].Y = buttonAbsRect.Top + imageOffset;
points[2].X = buttonAbsRect.Right - imageOffset;
points[2].Y = buttonAbsRect.Bottom - (imageOffset + 1f);
}
else
{
points[0].X = buttonAbsRect.Right - imageOffset;
points[0].Y = buttonAbsRect.Top + buttonAbsRect.Height / 2f;
points[1].X = buttonAbsRect.Left + (imageOffset + 1f);
points[1].Y = buttonAbsRect.Top + imageOffset;
points[2].X = buttonAbsRect.Left + (imageOffset + 1f);
points[2].Y = buttonAbsRect.Bottom - imageOffset;
}
using var brush = new SKPaint { Style = SKPaintStyle.Fill, Color = _lineCurrentColor };
graph.FillPolygon(brush, points);
break;
}
case (ScrollBarButtonType.ZoomReset):
{
// Draw circule with a minus sign
using var pen = new SKPaint { Style = SKPaintStyle.Fill, Color = _lineCurrentColor };
graph.DrawEllipse(pen, buttonAbsRect.Left + imageOffset - 0.5f, buttonAbsRect.Top + imageOffset - 0.5f, buttonAbsRect.Width - 2f * imageOffset, buttonAbsRect.Height - 2f * imageOffset);
graph.DrawLine(pen, buttonAbsRect.Left + imageOffset + 1.5f, buttonAbsRect.Top + buttonAbsRect.Height / 2f - 0.5f, buttonAbsRect.Right - imageOffset - 2.5f, buttonAbsRect.Top + buttonAbsRect.Height / 2f - 0.5f);
break;
}
}
// Reset graphics transformation for button pressed mode
if (pressedState)
{
graph.TranslateTransform(-pressedShifting, -pressedShifting);
}
}