|
public DrawRoundRect ( |
||
| rect | ||
| rx | float | |
| ry | float | |
| paint | ||
| return | void | |
public static void ManageDrawMatrix(SKCanvas canvas, int width, int height)
{
var size = ((float)height > width ? width : height) * 0.5f;
var center = new SKPoint((width - size) / 2f, (height - size) / 2f);
// draw these at specific locations
var leftRect = SKRect.Create(center.X - size / 2f, center.Y, size, size);
var rightRect = SKRect.Create(center.X + size / 2f, center.Y, size, size);
// draw this at the current location / transformation
var rotatedRect = SKRect.Create(0f, 0f, size, size);
using (var paint = new SKPaint()) {
paint.IsAntialias = true;
canvas.Clear(XamPurple);
// draw
paint.Color = XamDkBlue;
canvas.DrawRect(leftRect, paint);
// save
canvas.Save();
// transform
canvas.Translate(width / 2f, center.Y);
canvas.RotateDegrees(45);
// draw
paint.Color = XamGreen;
canvas.DrawRoundRect(rotatedRect, 10, 10, paint);
// undo transform / restore
canvas.Restore();
// draw
paint.Color = XamLtBlue;
canvas.DrawRect(rightRect, paint);
}
}
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();
}
private static void DrawBackground(LabelStyle style, SKRect rect, SKCanvas target)
{
if (style.BackColor != null)
{
var color = style.BackColor?.Color?.ToSkia();
if (color.HasValue)
{
var rounding = 6;
using (var backgroundPaint = new SKPaint {Color = color.Value})
{
target.DrawRoundRect(rect, rounding, rounding, backgroundPaint);
}
}
}
}
public static void ManageDrawMatrix (SKCanvas canvas, int width, int height)
{
var size = ((float)height > width ? width : height) * 0.5f;
var center = new SKPoint ((width - size) / 2f, (height - size) / 2f);
// draw these at specific locations
var leftRect = SKRect.Create (center.X - size / 2f, center.Y, size, size);
var rightRect = SKRect.Create (center.X + size / 2f, center.Y, size, size);
// draw this at the current location / transformation
var rotatedRect = SKRect.Create (0f, 0f, size, size);
using (var paint = new SKPaint ()) {
paint.IsAntialias = true;
canvas.Clear (XamPurple);
// draw
paint.Color = XamDkBlue;
canvas.DrawRect (leftRect, paint);
// save
canvas.Save();
// transform
canvas.Translate (width / 2f, center.Y);
canvas.RotateDegrees (45);
// draw
paint.Color = XamGreen;
canvas.DrawRoundRect (rotatedRect, 10, 10, paint);
// undo transform / restore
canvas.Restore();
// draw
paint.Color = XamLtBlue;
canvas.DrawRect (rightRect, paint);
}
}
