DrawCircle() public method

public DrawCircle ( float cx, float cy, float radius, SKPaint paint ) : void
cx float
cy float
radius float
paint SKPaint
return void
Beispiel #1
0
        private void ReadElement(XElement e, SKCanvas canvas, SKPaint stroke, SKPaint fill)
        {
            ReadPaints(e, ref stroke, ref fill);

            // transform matrix
            var transform = ReadTransform(e.Attribute("transform")?.Value ?? string.Empty);

            canvas.Save();
            canvas.Concat(ref transform);

            // SVG elements
            var elementName = e.Name.LocalName;

            switch (elementName)
            {
            case "text":
                if (stroke != null || fill != null)
                {
                    ReadText(e, canvas, stroke?.Clone(), fill?.Clone());
                }
                break;

            case "rect":
                if (stroke != null || fill != null)
                {
                    var x      = ReadNumber(e.Attribute("x"));
                    var y      = ReadNumber(e.Attribute("y"));
                    var width  = ReadNumber(e.Attribute("width"));
                    var height = ReadNumber(e.Attribute("height"));
                    var rx     = ReadNumber(e.Attribute("rx"));
                    var ry     = ReadNumber(e.Attribute("ry"));
                    var rect   = SKRect.Create(x, y, width, height);
                    if (rx > 0 || ry > 0)
                    {
                        if (fill != null)
                        {
                            canvas.DrawRoundRect(rect, rx, ry, fill);
                        }
                        if (stroke != null)
                        {
                            canvas.DrawRoundRect(rect, rx, ry, stroke);
                        }
                    }
                    else
                    {
                        if (fill != null)
                        {
                            canvas.DrawRect(rect, fill);
                        }
                        if (stroke != null)
                        {
                            canvas.DrawRect(rect, stroke);
                        }
                    }
                }
                break;

            case "ellipse":
                if (stroke != null || fill != null)
                {
                    var cx = ReadNumber(e.Attribute("cx"));
                    var cy = ReadNumber(e.Attribute("cy"));
                    var rx = ReadNumber(e.Attribute("rx"));
                    var ry = ReadNumber(e.Attribute("ry"));
                    if (fill != null)
                    {
                        canvas.DrawOval(cx, cy, rx, ry, fill);
                    }
                    if (stroke != null)
                    {
                        canvas.DrawOval(cx, cy, rx, ry, stroke);
                    }
                }
                break;

            case "circle":
                if (stroke != null || fill != null)
                {
                    var cx = ReadNumber(e.Attribute("cx"));
                    var cy = ReadNumber(e.Attribute("cy"));
                    var rr = ReadNumber(e.Attribute("r"));
                    if (fill != null)
                    {
                        canvas.DrawCircle(cx, cy, rr, fill);
                    }
                    if (stroke != null)
                    {
                        canvas.DrawCircle(cx, cy, rr, stroke);
                    }
                }
                break;

            case "path":
                if (stroke != null || fill != null)
                {
                    var d = e.Attribute("d")?.Value;
                    if (!string.IsNullOrWhiteSpace(d))
                    {
                        var path = SKPath.ParseSvgPathData(d);
                        if (fill != null)
                        {
                            canvas.DrawPath(path, fill);
                        }
                        if (stroke != null)
                        {
                            canvas.DrawPath(path, stroke);
                        }
                    }
                }
                break;

            case "polygon":
            case "polyline":
                if (stroke != null || fill != null)
                {
                    var close = elementName == "polygon";
                    var p     = e.Attribute("points")?.Value;
                    if (!string.IsNullOrWhiteSpace(p))
                    {
                        var path = ReadPolyPath(p, close);
                        if (fill != null)
                        {
                            canvas.DrawPath(path, fill);
                        }
                        if (stroke != null)
                        {
                            canvas.DrawPath(path, stroke);
                        }
                    }
                }
                break;

            case "g":
                if (e.HasElements)
                {
                    foreach (var gElement in e.Elements())
                    {
                        ReadElement(gElement, canvas, stroke?.Clone(), fill?.Clone());
                    }
                }
                break;

            case "use":
                if (e.HasAttributes)
                {
                    var href = ReadHref(e);
                    if (href != null)
                    {
                        // TODO: copy/process other attributes

                        var x            = ReadNumber(e.Attribute("x"));
                        var y            = ReadNumber(e.Attribute("y"));
                        var useTransform = SKMatrix.MakeTranslation(x, y);

                        canvas.Save();
                        canvas.Concat(ref useTransform);

                        ReadElement(href, canvas, stroke?.Clone(), fill?.Clone());

                        canvas.Restore();
                    }
                }
                break;

            case "line":
                if (stroke != null)
                {
                    var x1 = ReadNumber(e.Attribute("x1"));
                    var x2 = ReadNumber(e.Attribute("x2"));
                    var y1 = ReadNumber(e.Attribute("y1"));
                    var y2 = ReadNumber(e.Attribute("y2"));
                    canvas.DrawLine(x1, y1, x2, y2, stroke);
                }
                break;

            case "switch":
                if (e.HasElements)
                {
                    foreach (var ee in e.Elements())
                    {
                        var requiredFeatures   = ee.Attribute("requiredFeatures");
                        var requiredExtensions = ee.Attribute("requiredExtensions");
                        var systemLanguage     = ee.Attribute("systemLanguage");

                        // TODO: evaluate requiredFeatures, requiredExtensions and systemLanguage
                        var isVisible =
                            requiredFeatures == null &&
                            requiredExtensions == null &&
                            systemLanguage == null;

                        if (isVisible)
                        {
                            ReadElement(ee, canvas, stroke?.Clone(), fill?.Clone());
                        }
                    }
                }
                break;

            case "defs":
            case "title":
            case "desc":
            case "description":
                // already read earlier
                break;

            default:
                LogOrThrow($"SVG element '{elementName}' is not supported");
                break;
            }

            // restore matrix
            canvas.Restore();
        }
Beispiel #2
0
 public void DrawCircle(float x, float y, float radius, PaintBrush paint)
 => _canvas.DrawCircle(x, y, radius, paint.ToSkia());
 public void DrawCircle(float x, float y, float radius, PaintBrush paint)
 => _canvas.DrawCircle(x, y, radius, GetSKPaint(paint));
Beispiel #4
0
 private static void DrawCircle(SKCanvas canvas, float x, float y, float radius, SKPaint fillColor,
     SKPaint lineColor)
 {
     if ((fillColor != null) && fillColor.Color.Alpha != 0) canvas.DrawCircle(x, y, radius, fillColor);
     if ((lineColor != null) && lineColor.Color.Alpha != 0) canvas.DrawCircle(x, y, radius, lineColor);
 }