C# CGContext.StrokePath方法代码示例

 /// <summary>
 /// Draws the map rectangle.
 /// </summary>
 /// <param name="mapRect">Map rectangle.</param>
 /// <param name="zoomScale">Zoom scale.</param>
 /// <param name="context"> Graphics context.</param>
 public override void DrawMapRect(MKMapRect mapRect, nfloat zoomScale, CGContext context)
 {
     base.DrawMapRect(mapRect, zoomScale, context);
     var multiPolygons = (MultiPolygon)this.polygonOverlay;
     foreach (var item in multiPolygons.Polygons)
     {
         var path = new CGPath();
         this.InvokeOnMainThread(() =>
             {
                 path = PolyPath(item.Polygon);
             });
         if (path != null)
         {
             context.SetFillColor(item.FillColor);
             context.BeginPath();
             context.AddPath(path);
             context.DrawPath(CGPathDrawingMode.EOFill);
             if (item.DrawOutlines)
             {
                 context.BeginPath();
                 context.AddPath(path);
                 context.StrokePath();
             }
         }
     }
 }

        public override void Draw(CGRect bounds, CGContext context, UIView view)
        {
            var width = 0.5f / UIScreen.MainScreen.Scale;
            context.BeginPath();
            context.SetLineWidth(width);
            context.SetStrokeColor(UIColor.FromRGB(150, 150, 154).CGColor);
            var x = bounds.Width / 2f - width;
			context.MoveTo(x, 0f);
			context.AddLineToPoint(x, bounds.Height);
            context.StrokePath();

            var row = Value;
            var half = bounds.Height / 2;
            var halfText = _font.LineHeight / 2 + 1;

            row.Image1.Draw(new CGRect(15, half - 8f, 16f, 16f));

            if (!string.IsNullOrEmpty(row.Text1))
            {
                UIColor.Gray.SetColor();
                new NSString(row.Text1).DrawString(new CGRect(36,  half - halfText, bounds.Width / 2 - 40, _font.LineHeight), _font, UILineBreakMode.TailTruncation);
            }

            row.Image2.Draw(new CGRect(bounds.Width / 2 + 15, half - 8f, 16f, 16f));

            if (!string.IsNullOrEmpty(row.Text2))
            {
                UIColor.Gray.SetColor();
                new NSString(row.Text2).DrawString(new CGRect(bounds.Width / 2 + 36,  half - halfText, bounds.Width / 2 - 40, _font.LineHeight), _font, UILineBreakMode.TailTruncation);
            }
        }

 public static void DrawEllipsis(CGContext context, RectangleF rect, CGColor color, float lineWidth)
 {
     context.SaveState();
     context.SetStrokeColor(color);
     context.SetLineWidth(lineWidth);
     context.AddEllipseInRect(rect);
     context.StrokePath();
     context.RestoreState();
 }

 protected override void DrawGridlines(RectangleF rect, CGContext context)
 {
     float maxY = rect.Size.Height;
     for (float y = CellSize.Height; y < maxY; y += (CellSize.Height + Gridlines.Thickness))
     {
         context.MoveTo(rect.Left, y + 0.5f);
         context.AddLineToPoint(rect.Right, y + 0.5f);
     }
     context.StrokePath();
 }

 protected override void DrawGridlines(RectangleF rect, CGContext context)
 {
     float maxX = rect.Size.Width;
     float cellWidth = CellSize.Width;
     for (float x = cellWidth; x < maxX; x += (cellWidth + Gridlines.Thickness))
     {
         context.MoveTo(x + 0.5f, rect.Location.Y);
         context.AddLineToPoint(x + 0.5f, rect.Size.Height);
     }
     context.StrokePath();
 }

        public override void DrawInContext(CGContext ctx)
        {
            base.DrawInContext (ctx);

            // clip
            var cornerRadius = Bounds.Height / 2.0f;
            UIBezierPath switchOutline =  UIBezierPath.FromRoundedRect( (CGRect)Bounds, (nfloat)cornerRadius);
            ctx.AddPath (switchOutline.CGPath);
            ctx.Clip ();

            // 1) fill the track
            ctx.SetFillColor (UIColor.Green.CGColor);
            ctx.AddPath(switchOutline.CGPath);
            ctx.FillPath ();

            // 2) fill the highlighed range //Skipped for demo

            // 3) add a highlight over the track
            CGRect highlight = new CGRect(cornerRadius/2, Bounds.Height/2,
                Bounds.Width - cornerRadius, Bounds.Height/2);
            UIBezierPath highlightPath = UIBezierPath.FromRoundedRect ((CGRect)highlight, (nfloat)highlight.Height / 2.0f);
            ctx.AddPath(highlightPath.CGPath);
            ctx.SetFillColor( UIColor.FromWhiteAlpha((nfloat)1.0f, (nfloat)0.4f).CGColor);
            ctx.FillPath ();

            // 4) inner shadow
            ctx.SetShadow( new CGSize(0f, 2.0f), 3.0f, UIColor.Gray.CGColor);
            ctx.AddPath (switchOutline.CGPath);
            ctx.SetStrokeColor(UIColor.Gray.CGColor);
            ctx.StrokePath ();

            // 5) outline the track
            ctx.AddPath( switchOutline.CGPath);
            ctx.SetStrokeColor(UIColor.Black.CGColor);
            ctx.SetLineWidth ((nfloat)0.5f);
            ctx.StrokePath ();

            //
            //			ctx.SetFillColor (UIColor.Blue.CGColor);
            //			ctx.FillRect (Bounds);
        }

	public override void DrawInContext (CGContext context)
	{
		// Drawing with a white stroke color
		context.SetRGBStrokeColor (1, 1, 1, 1);
		// And drawing with a blue fill color
		context.SetRGBFillColor (0, 0, 1, 1);
		// Draw them with a 2 stroke width so they are a bit more visible.
		context.SetLineWidth (2);
		
		// Add Rect to the current path, then stroke it
		context.AddRect (new RectangleF (30, 30, 60, 60));
		context.StrokePath ();
		
		// Stroke Rect convenience that is equivalent to above
		context.StrokeRect (new RectangleF (30, 120, 60, 60));
		
		// Stroke rect convenience equivalent to the above, plus a call to context.SetLineWidth ().
		context.StrokeRectWithWidth (new RectangleF (30, 210, 60, 60), 10);
		// Demonstate the stroke is on both sides of the path.
		context.SaveState ();
		context.SetRGBStrokeColor (1, 0, 0, 1);
		context.StrokeRectWithWidth (new RectangleF (30, 210, 60, 60), 2);
		context.RestoreState ();
		
		var rects = new RectangleF []
		{
			new RectangleF (120, 30, 60, 60),
			new RectangleF (120, 120, 60, 60),
			new RectangleF (120, 210, 60, 60),
		};
		// Bulk call to add rects to the current path.
		context.AddRects (rects);
		context.StrokePath ();
		
		// Create filled rectangles via two different paths.
		// Add/Fill path
		context.AddRect (new RectangleF (210, 30, 60, 60));
		context.FillPath ();
		// Fill convienience.
		context.FillRect (new RectangleF (210, 120, 60, 60));
	}	

        public override void DrawInContext(CGContext ctx)
        {
            base.DrawInContext (ctx);

            // clip
            var cornerRadius = Bounds.Height * Slider.Curvaceousness / 2.0f;
            UIBezierPath switchOutline =  UIBezierPath.FromRoundedRect( (CGRect)Bounds, (nfloat)cornerRadius);
            ctx.AddPath (switchOutline.CGPath);
            ctx.Clip ();

            // 1) fill the track
            ctx.SetFillColor (Slider.TrackColor.CGColor);
            ctx.AddPath(switchOutline.CGPath);
            ctx.FillPath ();

            // 2) fill the highlighed range
            ctx.SetFillColor(Slider.TrackHighlightColor.CGColor);
            var lower = Slider.positionForValue (Slider.LowValue);
            var higher = Slider.positionForValue(Slider.HighValue);
            ctx.FillRect((CGRect)new CGRect(lower, 0, higher - lower, Bounds.Height));

            // 3) add a highlight over the track
            CGRect highlight = new CGRect(cornerRadius/2, Bounds.Height/2,
                Bounds.Width - cornerRadius, Bounds.Height/2);
            UIBezierPath highlightPath = UIBezierPath.FromRoundedRect ((CGRect)highlight, (nfloat)highlight.Height * Slider.Curvaceousness / 2.0f);
            ctx.AddPath(highlightPath.CGPath);
            ctx.SetFillColor( UIColor.FromWhiteAlpha((nfloat)1.0f, (nfloat)0.4f).CGColor);
            ctx.FillPath ();

            // 4) inner shadow
            ctx.SetShadow( new CGSize(0f, 2.0f), 3.0f, UIColor.Gray.CGColor);
            ctx.AddPath (switchOutline.CGPath);
            ctx.SetStrokeColor(UIColor.Gray.CGColor);
            ctx.StrokePath ();

            // 5) outline the track
            ctx.AddPath( switchOutline.CGPath);
            ctx.SetStrokeColor(UIColor.Black.CGColor);
            ctx.SetLineWidth ((nfloat)0.5f);
            ctx.StrokePath ();
        }

	public override void DrawInContext (CGContext context)
	{
		// Draw lines with a white stroke color
		context.SetRGBStrokeColor (1f, 1f, 1f, 1f);

		// Draw them with a 2.0 stroke width so they are more visible
		context.SetLineWidth (2);

		context.MoveTo (10, 30);
		context.AddLineToPoint (310, 30);
		context.StrokePath ();

		// Draw connected sequence of lines
		var points = new PointF [] {
			new PointF (10, 90),
			new PointF (70, 60),
			new PointF (130, 90),
			new PointF (190, 60),
			new PointF (250, 90),
			new PointF (310, 60)
		};
		
		context.AddLines (points);
		context.StrokePath ();

		var segments = new PointF [] {
			new PointF (10, 150),
			new PointF (70, 120),
			new PointF (130, 150),
			new PointF (190, 120),
			new PointF (250, 150),
			new PointF (310, 120),
		};

		// Bulk call to stroke a sequence of line segments

		context.StrokeLineSegments (segments);
	}

 public void DrawPolyline(MKPolyline polygon,MKMapRect mapRect, float zoomScale, CGContext context)
 {
     CGPath path = this.polyPath (polygon,mapRect,zoomScale,context);
     if (path != null)
     {
         this.ApplyFillProperties (context, zoomScale);
         context.BeginPath ();
         context.AddPath (path);
         context.DrawPath (CGPathDrawingMode.Stroke);
         this.ApplyStrokeProperties (context, zoomScale);
         context.BeginPath ();
         context.AddPath (path);
         context.StrokePath ();
     }
 }

        public override void Draw(RectangleF bounds, CGContext context, UIView view)
        {
            context.BeginPath();
			context.SetLineWidth(1.0f);
			context.SetStrokeColor(UIColor.FromRGB(199, 199, 205).CGColor);
			var x = (int)System.Math.Ceiling(bounds.Width / 2 - 0.5f);
			context.MoveTo(x, 0f);
			context.AddLineToPoint(x, bounds.Height);
            context.StrokePath();

            /*
            context.BeginPath();
            context.SetStrokeColor(UIColor.FromRGBA(250, 250, 250, 128).CGColor);
            context.MoveTo(bounds.Width / 2 + 0.5f, 0);
            context.AddLineToPoint(bounds.Width / 2 + 0.5f, bounds.Height);
            context.StrokePath();
            */

            var row = Value;
            var half = bounds.Height / 2;
            var halfText = _font.LineHeight / 2 + 1;

            row.Image1.Draw(new RectangleF(15, half - 8f, 16f, 16f));

            if (!string.IsNullOrEmpty(row.Text1))
            {
                UIColor.Gray.SetColor();
                view.DrawString(row.Text1, new RectangleF(36,  half - halfText, bounds.Width / 2 - 40, _font.LineHeight), _font, UILineBreakMode.TailTruncation);
            }

            row.Image2.Draw(new RectangleF(bounds.Width / 2 + 15, half - 8f, 16f, 16f));

            if (!string.IsNullOrEmpty(row.Text2))
            {
                UIColor.Gray.SetColor();
                view.DrawString(row.Text2, new RectangleF(bounds.Width / 2 + 36,  half - halfText, bounds.Width / 2 - 40, _font.LineHeight), _font, UILineBreakMode.TailTruncation);
            }
        }

        public void DrawInContext(CGContext context, bool isDebuggingEnabled, bool usePreciseLocation)
        {
            LinePoint maybePriorPoint = null;

            foreach (var point in Points) {
                if (maybePriorPoint == null) {
                    maybePriorPoint = point;
                    continue;
                }

                var priorPoint = maybePriorPoint;

                var color = UIColor.Black;
                var pointType = point.PointType;

                if (isDebuggingEnabled) {
                    if (pointType.Has (PointType.Cancelled))
                        color = UIColor.Red;
                    else if (pointType.Has (PointType.NeedsUpdate))
                        color = UIColor.Orange;
                    else if (pointType.Has (PointType.Finger))
                        color = UIColor.Purple;
                    else if (pointType.Has (PointType.Coalesced))
                        color = UIColor.Green;
                    else if (pointType.Has (PointType.Predicted))
                        color = UIColor.Blue;
                } else {
                    if (pointType.Has (PointType.Cancelled))
                        color = UIColor.Red;
                    else if (pointType.Has (PointType.Finger))
                        color = UIColor.Purple;

                    if (pointType.Has (PointType.Predicted) && !pointType.Has (PointType.Cancelled))
                        color = color.ColorWithAlpha (.5f);
                }

                var location = usePreciseLocation ? point.PreciseLocation : point.Location;
                var priorLocation = usePreciseLocation ? priorPoint.PreciseLocation : priorPoint.Location;

                context.SetStrokeColor (color.CGColor);
                context.BeginPath ();
                context.MoveTo (priorLocation.X, priorLocation.Y);
                context.AddLineToPoint (location.X, location.Y);
                context.SetLineWidth (point.Magnitude);
                context.StrokePath ();

                // Draw azimuith and elevation on all non-coalesced points when debugging.
                if (isDebuggingEnabled &&
                    !point.PointType.Has (PointType.Coalesced) &&
                    !point.PointType.Has (PointType.Predicted) &&
                    !point.PointType.Has (PointType.Finger)) {
                    context.BeginPath ();
                    context.SetStrokeColor (UIColor.Red.CGColor);
                    context.SetLineWidth (.5f);
                    context.MoveTo (location.X, location.Y);
                    var targetPoint = new CGPoint (.5f + 10f * NMath.Cos (point.AltitudeAngle), 0f);
                    targetPoint = CGAffineTransform.MakeRotation (point.AzimuthAngle).TransformPoint (targetPoint);
                    targetPoint.X += location.X;
                    targetPoint.Y += location.Y;
                    context.AddLineToPoint (targetPoint.X, targetPoint.Y);
                    context.StrokePath ();
                }

                maybePriorPoint = point;
            }
        }

        void HatchHorizontalBrick(CGContext context)
        {
            var hatchWidth = getHatchWidth (hatchStyle);
            var hatchHeight = getHatchHeight (hatchStyle);
            var lineWidth = getLineWidth (hatchStyle);

            initializeContext(context, hatchHeight, false);

            /* draw background */
            drawBackground (context, backColor, hatchWidth, hatchHeight);

            /* draw lines in the foreground color */
            context.SetFillColor(foreColor.ToCGColor());

            /* draw lines in the foreground color */
            context.SetStrokeColor(foreColor.ToCGColor());
            context.SetLineWidth(lineWidth);
            context.SetLineCap(CGLineCap.Square);

            CGRect rect = new CGRect (0,0,1,1);

            rect.Y = 3;
            rect.Width = hatchWidth;
            rect.Height = hatchHeight - 4;
            context.StrokeRect(rect);

            context.MoveTo(hatchWidth / 2.0f, 0);
            context.AddLineToPoint(hatchWidth / 2.0f,3);
            context.StrokePath();
        }

		public void DrawInContext (CGContext context, bool isDebuggingEnabled, bool usePreciseLocation)
		{
			LinePoint maybePriorPoint = null;

			foreach (var point in points) {
				if (maybePriorPoint == null) {
					maybePriorPoint = point;
					continue;
				}

				var priorPoint = maybePriorPoint;

				var color = UIColor.Black;

				if (isDebuggingEnabled) {
					if (point.Properties.Contains (PointType.Cancelled))
						color = UIColor.Red;
					else if (point.Properties.Contains (PointType.NeedsUpdate))
						color = UIColor.Orange;
					else if (point.Properties.Contains (PointType.Finger))
						color = UIColor.Purple;
					else if (point.Properties.Contains (PointType.Coalesced))
						color = UIColor.Green;
					else if (point.Properties.Contains (PointType.Predicted))
						color = UIColor.Blue;
				} else {
					if (point.Properties.Contains (PointType.Cancelled))
						color = UIColor.Clear;
					else if (point.Properties.Contains (PointType.Finger))
						color = UIColor.Purple;
					if (point.Properties.Contains (PointType.Predicted) && !point.Properties.Contains (PointType.Cancelled))
						color = color.ColorWithAlpha (0.5f);
				}

				var location = usePreciseLocation ? point.PreciseLocation : point.Location;
				var priorLocation = usePreciseLocation ? priorPoint.PreciseLocation : priorPoint.Location;

				context.SetStrokeColor (color.CGColor);
				context.BeginPath ();
				context.MoveTo (priorLocation.X, priorLocation.Y);
				context.AddLineToPoint (location.X, location.Y);
				context.SetLineWidth (point.Magnitude);
				context.StrokePath ();

				maybePriorPoint = point;
			}
		}

        protected void HatchUpwardDiagonal(CGContext context)
        {
            var hatchSize = getHatchWidth (hatchStyle);
            var lineWidth = getLineWidth (hatchStyle);

            if (hatchStyle != HatchStyle.ForwardDiagonal &&
                hatchStyle != HatchStyle.BackwardDiagonal)
            {
                initializeContext(context, hatchSize, false);
            }
            else {
                initializeContext(context, hatchSize, true);
            }

            /* draw background */
            drawBackground (context, backColor, hatchSize, hatchSize);

            /* draw lines in the foreground color */
            context.SetStrokeColor(foreColor.ToCGColor());
            context.SetFillColor(foreColor.ToCGColor());

            context.SetLineWidth(1);
            context.SetLineCap(CGLineCap.Square);

            context.MoveTo(0,0);
            context.AddLineToPoint(hatchSize,hatchSize);
            /* draw a diagonal line for as many times as linewidth*/
            for (int l = 0; l < lineWidth; l++)
            {
                /* draw a diagonal line */
                context.MoveTo(l,0);
                context.AddLineToPoint(hatchSize, hatchSize-l);

                context.StrokePath();
            }

            /**
             * because we are within a rectangular pattern we have to complete the tip of the preceeding line
             * pattern
             */
            for (int k = 1; k < lineWidth; k++)
            {
                /* draw a diagonal line */
                context.MoveTo(0,hatchSize-k);
                context.AddLineToPoint(k-1, hatchSize-1);

                context.StrokePath();
            }
        }