/// <summary>
/// Draws the view
/// </summary>
/// <param name="drawing">drawing wrapper</param>
/// <param name="options">drawing options</param>
/// <param name="margin">drawing margin</param>
public virtual void Draw(IDrawing drawing, IDrawOptions options, IMargin margin)
{
if (drawing == null || margin == null)
{
throw new InvalidArgumentException("parameter is null");
}
if (!(options is ScalingDrawOptions))
{
throw new InvalidArgumentException("options is not compatible");
}
var state = ((ScalingDrawOptions)options).State;
var canvasSize = options.CanvasSize;
var clip = new RectangleF((float)margin.Left, (float)margin.Top, (float)(canvasSize.Width - margin.LeftAndRight), (float)(canvasSize.Height - margin.TopAndBottom));
if (state.MovingStart != null && state.MovingPosition != null)
{
drawing.Line(state.MovingPenColor, state.MovingStart.Value.X, state.MovingStart.Value.Y, state.MovingPosition.Value.X, state.MovingPosition.Value.Y, clip);
}
if (state.ScalingStart != null && state.ScalingPosition != null)
{
Rectangle rectangle = SortCoordinates(state.ScalingStart.Value, state.ScalingPosition.Value);
var color = state.ZoomIncrease ? state.ZoomInPenColor : state.ZoomOutPenColor;
drawing.Rectangle(color, rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height, clip);
}
}
private void DrawHorizontalLine(IGridState state, IDrawing drawing, Structs.Size canvasSize, IMargin margin, ref SizeF strY, double valueData, double stepData, bool calcWidth, ref double maxTextSize, StringAlignment align, ref int lastTextPos)
{
double y = this.scaleService.ToScreenY(valueData);
if (y >= 0 && y <= canvasSize.Height - margin.Bottom - margin.Top)
{
if (calcWidth)
{
var strValue = state.ItemFormatter.ToString(Axis.Y, new DataItem(0, valueData), stepData);
var strSize = drawing.MeasureText(strValue);
maxTextSize = maxTextSize < strSize.Width ? strSize.Width : maxTextSize;
strY.Height = strSize.Height;
}
else
{
double lineYPos = canvasSize.Height - margin.Bottom - y; // Invert graphic
var color = valueData != 0 ? state.GridColor : state.AxeColor;
drawing.Line(color, margin.Left, lineYPos, canvasSize.Width - margin.Right, lineYPos);
if (CalcAndCheckLabelRectY(state, canvasSize, margin, ref strY, valueData, align, lineYPos, out Rectangle rect, out bool borderValue))
{
var strValue = state.ItemFormatter.ToString(Axis.Y, new DataItem(0, valueData), stepData);
drawing.Text(state.TextYColor, rect, strValue, StringAlignment.Far, align);
lastTextPos = rect.Top;
}
}
}
}
private static void DrawVerticalLine(IGridState state, IDrawing drawing, Structs.Size canvasSize, IMargin margin, SizeF strX, double screenPos, double valueData, double maxData, double stepData, StringAlignment align, ref int lastTextPos)
{
if (screenPos >= 0 &&
(align == StringAlignment.Center && (screenPos <= canvasSize.Width - margin.Left - margin.Right - strX.Width / 2) ||
(align == StringAlignment.Far && (screenPos - strX.Width <= canvasSize.Width - margin.Left - margin.Right))))
{
double lineXPos = screenPos + margin.Left;
var color = valueData != 0 ? state.GridColor : state.AxeColor;
drawing.Line(color, lineXPos, margin.Top, lineXPos, canvasSize.Height - margin.Bottom);
if (CalcAndCheckLabelRectX(state, ref canvasSize, margin, ref strX, valueData, maxData, align, lineXPos, ref lastTextPos, out Rectangle rect))
{
double linePos2 = canvasSize.Height - margin.Bottom;
drawing.Line(color, lineXPos, linePos2, lineXPos, linePos2 + state.LabelPadding.Top + 1);
var strValue = state.ItemFormatter.ToString(Axis.X, new DataItem(valueData, 0), stepData);
drawing.Text(state.TextXColor, rect, strValue, align, StringAlignment.Center);
lastTextPos = rect.Right;
}
}
}
private void DrawAllData(IDataDrawState state, IDrawing drawing, IMargin margin, Size canvasSize, System.Drawing.RectangleF clip)
{
var startX = this.scaleService.State.X1;
var endX = this.scaleService.State.X2;
if (this.dataService.ItemCount == 1)
{
// Draw point for single data item
foreach (var item in this.dataService.GetItems(startX, endX))
{
if (item != null && this.scaleService.IsItemVisible(item))
{
var x = this.scaleService.ToScreen(Axis.X, item.X);
var y = this.scaleService.ToScreen(Axis.Y, item.Y);
drawing.Circle(state.LineColor, margin.Left + x, canvasSize.Height - margin.Bottom - y, 4, clip);
}
}
}
else
{
IDataItem prevItem = null;
// Draw lines
foreach (var item in this.dataService.GetItems(startX, endX))
{
if (item != null && prevItem != null &&
(this.scaleService.IsItemVisible(prevItem) ||
this.scaleService.IsItemVisible(item)))
{
var x1 = this.scaleService.ToScreen(Axis.X, prevItem.X);
var y1 = this.scaleService.ToScreen(Axis.Y, prevItem.Y);
var x2 = this.scaleService.ToScreen(Axis.X, item.X);
var y2 = this.scaleService.ToScreen(Axis.Y, item.Y);
drawing.Line(state.LineColor, margin.Left + x1, canvasSize.Height - margin.Bottom - y1, margin.Left + x2, canvasSize.Height - margin.Bottom - y2, clip);
}
prevItem = item;
}
}
}
