/// <summary>
/// 绘制路径(未封闭区域);
/// </summary>
/// <param name="pen"></param>
/// <param name="points"></param>
public void DrawCurve(Pen pen, IEnumerable <Vector2D> points)
{
if (pen == null)
{
throw new ArgumentNullException(nameof(pen));
}
ValidateDrawingContext();
//使用一个变量存储上一次的视图点;
Point?lastScreenPoint = null;
var sysPen = PenAdapter.ConverterToSystemPen(pen);
foreach (var point in points)
{
var thisScreenPoint = ConvertVectorToScreenPoint(point);
if (lastScreenPoint != null)
{
//绘制的是上一次的节点到这一次的节点;
DrawingContext.DrawLine(sysPen, lastScreenPoint.Value, thisScreenPoint);
}
lastScreenPoint = thisScreenPoint;
}
//var path = GetCurveGeometry(points);
//DrawingContext.DrawGeometry(null, sysPen, path);
}
/// <summary>
/// 绘制圆弧;
/// </summary>
/// <param name="pen"></param>
/// <param name="center"></param>
/// <param name="radius"></param>
/// <param name="beginangle"></param>
/// <param name="angle"></param>
public void DrawArc(Pen pen, Vector2D center, double radius, double beginangle, double angle, bool smallAngle)
{
ValidateDrawingContext();
beginangle %= (Math.PI * 2);
angle %= (Math.PI * 2);
var centerPoint = ConvertVectorToScreenPoint(center);
var endAngle = beginangle + angle;
var startPoint = new Vector2D(center.X + Math.Cos(beginangle) * radius, center.Y + Math.Sin(beginangle) * radius);
var endPoint = new Vector2D(center.X + Math.Cos(endAngle) * radius, center.Y + Math.Sin(endAngle) * radius);
var startScreenPoint = ConvertVectorToScreenPoint(startPoint);
var endScreenPoint = ConvertVectorToScreenPoint(endPoint);
//求两边之叉积,由叉积的符号决定是顺时针和逆时针;
var cross = Math.Cos(beginangle) * Math.Sin(endAngle) - Math.Sin(beginangle) * Math.Cos(endAngle);
var screenRadius = _canvasProxy.ToScreen(radius);
//因为数学坐标中，
var arcGeometry = GetArcGeometry(
startScreenPoint,
endScreenPoint,
screenRadius,
smallAngle,
cross < 0 ? SystemMedia.SweepDirection.Clockwise: SystemMedia.SweepDirection.Counterclockwise
);
DrawingContext.DrawGeometry(
null,
PenAdapter.ConverterToSystemPen(pen),
arcGeometry
);
}
/// <summary>
/// 以视图坐标为标准,绘制椭圆;
/// </summary>
/// <param name="rectangle">以视图坐标为准的矩形</param>
/// <param name="brush">填充色</param>
/// <param name="pen">笔</param>
public void NativeDrawEllipse(Brush brush, Pen pen, Vector2D center, double radiusX, double radiusY)
{
if (center == null)
{
throw new ArgumentNullException(nameof(center));
}
var centerPoint = Vector2DAdapter.ConvertToSystemPoint(center);
DrawingContext.DrawEllipse(
BrushAdapter.ConvertToSystemBrush(brush),
PenAdapter.ConverterToSystemPen(pen),
centerPoint,
radiusX,
radiusY
);
}
/// <summary>
/// 以视图坐标为标准,绘制矩形;
/// </summary>
/// <param name="rectangle">以视图坐标为准的矩形</param>
/// <param name="brush">填充色</param>
/// <param name="pen">笔</param>
public void NativeDrawRectangle(Rectangle2D2 rectangle, Brush brush, Pen pen)
{
if (rectangle == null)
{
throw new ArgumentNullException(nameof(rectangle));
}
ValidateDrawingContext();
var vertexes = rectangle.GetVertexes();
NativeDrawFill(
vertexes.Select(p => Vector2DAdapter.ConvertToSystemPoint(p)),
BrushAdapter.ConvertToSystemBrush(brush),
PenAdapter.ConverterToSystemPen(pen)
);
}
/// <summary>
/// 根据所有的点，组成一个封闭区域，且可以填充，并且填充
/// </summary>
/// <param name="points">所有的顶点坐标</param>
/// <param name="brush">区域颜色</param>
private void DrawFill(IEnumerable <Vector2D> points, Brush brush, Pen pen)
{
if (points == null)
{
throw new ArgumentNullException(nameof(points));
}
if (pen == null)
{
throw new ArgumentNullException(nameof(pen));
}
ValidateDrawingContext();
NativeDrawFill(
points.Select(p => ConvertVectorToScreenPoint(p)),
BrushAdapter.ConvertToSystemBrush(brush),
PenAdapter.ConverterToSystemPen(pen)
);
}
/// <summary>
/// 以视图坐标为标准,绘制线段;
/// </summary>
/// <param name="rectangle">以视图坐标为准的矩形</param>
/// <param name="brush">填充色</param>
/// <param name="pen">笔</param>
public void NativeDrawLine(Pen pen, Line2D line2D)
{
if (pen == null)
{
return;
}
if (line2D == null)
{
throw new ArgumentNullException(nameof(line2D));
}
ValidateDrawingContext();
//平台转换后再进行绘制;
DrawingContext.DrawLine(
PenAdapter.ConverterToSystemPen(pen),
Vector2DAdapter.ConvertToSystemPoint(line2D.Start),
Vector2DAdapter.ConvertToSystemPoint(line2D.End)
);
}
/// <summary>
/// 绘制线段;
/// </summary>
/// <param name="pen"></param>
/// <param name="line"></param>
public void DrawLine(Pen pen, Line2D line)
{
if (pen == null)
{
return;
}
if (line == null)
{
throw new ArgumentNullException(nameof(line));
}
ValidateDrawingContext();
var screenPoint1 = _canvasProxy.ToScreen(line.Start);
var screenPoint2 = _canvasProxy.ToScreen(line.End);
//平台转换后再进行绘制;
DrawingContext.DrawLine(
PenAdapter.ConverterToSystemPen(pen),
Vector2DAdapter.ConvertToSystemPoint(screenPoint1),
Vector2DAdapter.ConvertToSystemPoint(screenPoint2)
);
}
