|
public DrawOval ( |
||
| rect | ||
| paint | ||
| return | void | |
public static void DrawGradient(SKCanvas canvas, int width, int height)
{
var ltColor = SKColors.White;
var dkColor = SKColors.Black;
using (var paint = new SKPaint()) {
paint.IsAntialias = true;
using (var shader = SKShader.CreateLinearGradient(
new SKPoint(0, 0),
new SKPoint(0, height),
new [] { ltColor, dkColor },
null,
SKShaderTileMode.Clamp)) {
paint.Shader = shader;
canvas.DrawPaint(paint);
}
}
// Center and Scale the Surface
var scale = (width < height ? width : height) / (240f);
canvas.Translate(width / 2f, height / 2f);
canvas.Scale(scale, scale);
canvas.Translate(-128, -128);
using (var paint = new SKPaint()) {
paint.IsAntialias = true;
using (var shader = SKShader.CreateTwoPointConicalGradient(
new SKPoint(115.2f, 102.4f),
25.6f,
new SKPoint(102.4f, 102.4f),
128.0f,
new [] { ltColor, dkColor },
null,
SKShaderTileMode.Clamp
)) {
paint.Shader = shader;
canvas.DrawOval(new SKRect(51.2f, 51.2f, 204.8f, 204.8f), 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();
}
protected override void InternalDraw(SkiaSharp.SKCanvas canvas)
{
base.InternalDraw(canvas);
using (var paint = new SKPaint())
{
var renderBounds = RenderBounds;
var smallestSize = Math.Min(renderBounds.Size.Width, renderBounds.Size.Height);
var square = new Rectangle(renderBounds.Center.X - smallestSize / 2.0, renderBounds.Center.Y - smallestSize / 2.0, smallestSize, smallestSize);
Rectangle imageBounds = renderBounds;
paint.IsAntialias = true;
if (IsCheckable)
{
paint.Color = SelectionBackgroundColor.ToSKColor();
canvas.DrawOval(square.ToSKRect(), paint);
var darkerOutline = SelectionBackgroundColor.AddLuminosity(-0.1);
paint.IsStroke = true;
paint.Color = darkerOutline.ToSKColor();
paint.StrokeWidth = 1.0f;
canvas.DrawOval(square.ToSKRect(), paint);
imageBounds = renderBounds.Inflate(-BorderSize, -BorderSize);
}
if (Drawable != null && !IsSelected)
{
var drawableSize = Drawable.GetSize(imageBounds.Width, imageBounds.Height);
double ratioX = (double)imageBounds.Width / (double)drawableSize.Width;
double ratioY = (double)imageBounds.Height / (double)drawableSize.Height;
double ratio = ratioX < ratioY ? ratioX : ratioY;
double newWidth = drawableSize.Width * ratio;
double newHeight = drawableSize.Height * ratio;
float cx = (float)(imageBounds.X + (imageBounds.Width / 2.0) - (newWidth / 2.0));
float cy = (float)(imageBounds.Y + (imageBounds.Height / 2.0) - (newHeight / 2.0));
paint.XferMode = SKXferMode.SrcOver;
paint.FilterQuality = SKFilterQuality.Low;
Drawable.Draw(canvas, new Rectangle(cx, cy, newWidth, newHeight), paint);
}
if (IsCheckable && IsSelected)
{
paint.Color = SelectionColor.ToSKColor();
paint.IsStroke = false;
canvas.DrawOval(square.ToSKRect(), paint);
double ratioX = (double)imageBounds.Width / (double)TickBitmap.Width;
double ratioY = (double)imageBounds.Height / (double)TickBitmap.Height;
double ratio = ratioX < ratioY ? ratioX : ratioY;
double newWidth = TickBitmap.Width * ratio;
double newHeight = TickBitmap.Height * ratio;
float cx = (float)(imageBounds.X + (imageBounds.Width / 2.0) - (newWidth / 2.0));
float cy = (float)(imageBounds.Y + (imageBounds.Height / 2.0) - (newHeight / 2.0));
paint.XferMode = SKXferMode.SrcOver;
paint.FilterQuality = SKFilterQuality.Low;
canvas.DrawBitmap(TickBitmap, new SKRect(cx, cy, (float)(cx + newWidth), (float)(cy + newHeight)), paint);
}
}
}
private void DrawEllipseInternal(SKCanvas canvas, SKPaint brush, SKPaint pen, bool isStroked, bool isFilled, ref SKRect rect)
{
if (isFilled)
{
canvas.DrawOval(rect, brush);
}
if (isStroked)
{
canvas.DrawOval(rect, pen);
}
}
public static void DrawGradient (SKCanvas canvas, int width, int height)
{
var ltColor = SKColors.White;
var dkColor = SKColors.Black;
using (var paint = new SKPaint ()) {
paint.IsAntialias = true;
using (var shader = SKShader.CreateLinearGradient (
new SKPoint (0, 0),
new SKPoint (0, height),
new [] {ltColor, dkColor},
null,
SKShaderTileMode.Clamp)) {
paint.Shader = shader;
canvas.DrawPaint (paint);
}
}
// Center and Scale the Surface
var scale = (width < height ? width : height) / (240f);
canvas.Translate (width/2f, height/2f);
canvas.Scale (scale, scale);
canvas.Translate (-128, -128);
using (var paint = new SKPaint ()) {
paint.IsAntialias = true;
using (var shader = SKShader.CreateTwoPointConicalGradient (
new SKPoint (115.2f, 102.4f),
25.6f,
new SKPoint (102.4f, 102.4f),
128.0f,
new [] {ltColor, dkColor},
null,
SKShaderTileMode.Clamp
)) {
paint.Shader = shader;
canvas.DrawOval (new SKRect (51.2f, 51.2f, 204.8f, 204.8f), paint);
}
}
}
