/// <summary>
/// Draws a marker that represents a data point in FastPoint series.
/// </summary>
/// <param name="graph">Chart graphics used to draw the marker.</param>
/// <param name="point">Series data point drawn.</param>
/// <param name="pointIndex">Data point index in the series.</param>
/// <param name="location">Marker location in pixels.</param>
/// <param name="markerStyle">Marker style.</param>
/// <param name="markerSize">Marker size in pixels.</param>
/// <param name="brush">Brush used to fill marker shape.</param>
/// <param name="borderPen">Marker border pen.</param>
virtual protected void DrawMarker(
ChartGraphics graph,
DataPoint point,
int pointIndex,
SKPoint location,
MarkerStyle markerStyle,
int markerSize,
SKPaint brush,
SKPaint borderPen)
{
// Transform 3D coordinates
if (chartArea3DEnabled)
{
Point3D[] points = new Point3D[1];
location = graph.GetRelativePoint(location);
points[0] = new Point3D(location.X, location.Y, seriesZCoordinate);
matrix3D.TransformPoints(points);
location.X = points[0].X;
location.Y = points[0].Y;
location = graph.GetAbsolutePoint(location);
}
// Create marker bounding rectangle in pixels
SKRect markerBounds = new(
location.X - markerSize / 2f, location.Y - markerSize / 2f, markerSize, markerSize);
// Draw Marker
switch (markerStyle)
{
case (MarkerStyle.Star4):
case (MarkerStyle.Star5):
case (MarkerStyle.Star6):
case (MarkerStyle.Star10):
{
// Set number of corners
int cornerNumber = 4;
if (markerStyle == MarkerStyle.Star5)
{
cornerNumber = 5;
}
else if (markerStyle == MarkerStyle.Star6)
{
cornerNumber = 6;
}
else if (markerStyle == MarkerStyle.Star10)
{
cornerNumber = 10;
}
// Get star polygon
SKPoint[] points = ChartGraphics.CreateStarPolygon(markerBounds, cornerNumber);
// Fill shape
graph.FillPolygon(brush, points);
// Draw border
if (borderPen != null)
{
graph.DrawPolygon(borderPen, points);
}
break;
}
case (MarkerStyle.Circle):
{
graph.FillEllipse(brush, markerBounds);
// Draw border
if (borderPen != null)
{
graph.DrawEllipse(borderPen, markerBounds);
}
break;
}
case (MarkerStyle.Square):
{
graph.FillRectangle(brush, markerBounds);
// Draw border
if (borderPen != null)
{
graph.DrawRectangle(
borderPen,
(int)Math.Round(markerBounds.Left, 0),
(int)Math.Round(markerBounds.Top, 0),
(int)Math.Round(markerBounds.Width, 0),
(int)Math.Round(markerBounds.Height, 0));
}
break;
}
case (MarkerStyle.Cross):
{
// Calculate cross line width and size
float crossLineWidth = (float)Math.Ceiling(markerSize / 4F);
float crossSize = markerSize; // * (float)Math.Sin(45f/180f*Math.PI)
// Calculate cross coordinates
SKPoint[] points = new SKPoint[12];
points[0].X = location.X - crossSize / 2F;
points[0].Y = location.Y + crossLineWidth / 2F;
points[1].X = location.X - crossSize / 2F;
points[1].Y = location.Y - crossLineWidth / 2F;
points[2].X = location.X - crossLineWidth / 2F;
points[2].Y = location.Y - crossLineWidth / 2F;
points[3].X = location.X - crossLineWidth / 2F;
points[3].Y = location.Y - crossSize / 2F;
points[4].X = location.X + crossLineWidth / 2F;
points[4].Y = location.Y - crossSize / 2F;
points[5].X = location.X + crossLineWidth / 2F;
points[5].Y = location.Y - crossLineWidth / 2F;
points[6].X = location.X + crossSize / 2F;
points[6].Y = location.Y - crossLineWidth / 2F;
points[7].X = location.X + crossSize / 2F;
points[7].Y = location.Y + crossLineWidth / 2F;
points[8].X = location.X + crossLineWidth / 2F;
points[8].Y = location.Y + crossLineWidth / 2F;
points[9].X = location.X + crossLineWidth / 2F;
points[9].Y = location.Y + crossSize / 2F;
points[10].X = location.X - crossLineWidth / 2F;
points[10].Y = location.Y + crossSize / 2F;
points[11].X = location.X - crossLineWidth / 2F;
points[11].Y = location.Y + crossLineWidth / 2F;
// Rotate cross coordinates 45 degrees
SKMatrix rotationMatrix = SKMatrix.CreateRotationDegrees(45, location.X, location.Y);
rotationMatrix.TransformPoints(points);
// Fill shape
graph.FillPolygon(brush, points);
// Draw border
if (borderPen != null)
{
graph.DrawPolygon(borderPen, points);
}
break;
}
case (MarkerStyle.Diamond):
{
SKPoint[] points = new SKPoint[4];
points[0].X = markerBounds.Left;
points[0].Y = markerBounds.Top + markerBounds.Height / 2F;
points[1].X = markerBounds.Left + markerBounds.Width / 2F;
points[1].Y = markerBounds.Top;
points[2].X = markerBounds.Right;
points[2].Y = markerBounds.Top + markerBounds.Height / 2F;
points[3].X = markerBounds.Left + markerBounds.Width / 2F;
points[3].Y = markerBounds.Bottom;
graph.FillPolygon(brush, points);
// Draw border
if (borderPen != null)
{
graph.DrawPolygon(borderPen, points);
}
break;
}
case (MarkerStyle.Triangle):
{
SKPoint[] points = new SKPoint[3];
points[0].X = markerBounds.Left;
points[0].Y = markerBounds.Bottom;
points[1].X = markerBounds.Top + markerBounds.Width / 2F;
points[1].Y = markerBounds.Top;
points[2].X = markerBounds.Right;
points[2].Y = markerBounds.Bottom;
graph.FillPolygon(brush, points);
// Draw border
if (borderPen != null)
{
graph.DrawPolygon(borderPen, points);
}
break;
}
default:
{
throw (new InvalidOperationException(SR.ExceptionFastPointMarkerStyleUnknown));
}
}
// Process selection regions
if (Common.ProcessModeRegions)
{
Common.HotRegionsList.AddHotRegion(
graph.GetRelativeRectangle(markerBounds),
point,
point.series.Name,
pointIndex);
}
}
/// <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);
}
}