|
public DrawRect ( |
||
| rect | ||
| paint | ||
| return | void | |
public static void MeasureTextSample (SKCanvas canvas, int width, int height)
{
canvas.DrawColor (SKColors.White);
using (var paint = new SKPaint ()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor (0x42, 0x81, 0xA4);
paint.TextEncoding = SKTextEncoding.Utf32;
canvas.DrawText ("Skia (UTF-32)", 0, 64.0f, paint);
var bounds = new SKRect();
paint.MeasureText ("Skia (UTF-32)", ref bounds);
bounds.Top += 64.0f;
bounds.Bottom += 64.0f;
paint.IsStroke = true;
paint.Color = SKColors.Red;
canvas.DrawRect (bounds, paint);
}
using (var paint = new SKPaint ()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor (0x9C, 0xAF, 0xB7);
paint.TextEncoding = SKTextEncoding.Utf16;
canvas.DrawText ("Skia (UTF-16)", 0, 144.0f, paint);
var bounds = new SKRect();
paint.MeasureText ("Skia (UTF-16)", ref bounds);
bounds.Top += 144.0f;
bounds.Bottom += 144.0f;
paint.IsStroke = true;
paint.Color = SKColors.Red;
canvas.DrawRect (bounds, paint);
}
using (var paint = new SKPaint ()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor (0xE6, 0xB8, 0x9C);
paint.TextEncoding = SKTextEncoding.Utf8;
canvas.DrawText ("Skia (UTF-8)", 0, 224.0f, paint);
var bounds = new SKRect();
paint.MeasureText ("Skia (UTF-8)", ref bounds);
bounds.Top += 224.0f;
bounds.Bottom += 224.0f;
paint.IsStroke = true;
paint.Color = SKColors.Red;
canvas.DrawRect (bounds, 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();
}
public static void MeasureTextSample(SKCanvas canvas, int width, int height)
{
canvas.DrawColor(SKColors.White);
using (var paint = new SKPaint()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor(0x42, 0x81, 0xA4);
paint.TextEncoding = SKTextEncoding.Utf32;
canvas.DrawText("Skia (UTF-32)", 0, 64.0f, paint);
var bounds = new SKRect();
paint.MeasureText("Skia (UTF-32)", ref bounds);
bounds.Top += 64.0f;
bounds.Bottom += 64.0f;
paint.IsStroke = true;
paint.Color = SKColors.Red;
canvas.DrawRect(bounds, paint);
}
using (var paint = new SKPaint()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor(0x9C, 0xAF, 0xB7);
paint.TextEncoding = SKTextEncoding.Utf16;
canvas.DrawText("Skia (UTF-16)", 0, 144.0f, paint);
var bounds = new SKRect();
paint.MeasureText("Skia (UTF-16)", ref bounds);
bounds.Top += 144.0f;
bounds.Bottom += 144.0f;
paint.IsStroke = true;
paint.Color = SKColors.Red;
canvas.DrawRect(bounds, paint);
}
using (var paint = new SKPaint()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor(0xE6, 0xB8, 0x9C);
paint.TextEncoding = SKTextEncoding.Utf8;
canvas.DrawText("Skia (UTF-8)", 0, 224.0f, paint);
var bounds = new SKRect();
paint.MeasureText("Skia (UTF-8)", ref bounds);
bounds.Top += 224.0f;
bounds.Bottom += 224.0f;
paint.IsStroke = true;
paint.Color = SKColors.Red;
canvas.DrawRect(bounds, paint);
}
}
public static void Xfermode(SKCanvas canvas, int width, int height)
{
var modes = Enum.GetValues(typeof(SKXferMode)).Cast <SKXferMode> ().ToArray();
var cols = width < height ? 3 : 5;
var rows = (modes.Length - 1) / cols + 1;
var w = (float)width / cols;
var h = (float)height / rows;
var rect = SKRect.Create(w, h);
var srcPoints = new[] {
new SKPoint(0.0f, 0.0f),
new SKPoint(w, 0.0f)
};
var srcColors = new [] {
SKColors.Magenta.WithAlpha(0),
SKColors.Magenta
};
var dstPoints = new [] {
new SKPoint(0.0f, 0.0f),
new SKPoint(0.0f, h)
};
var dstColors = new [] {
SKColors.Cyan.WithAlpha(0),
SKColors.Cyan
};
using (var text = new SKPaint())
using (var stroke = new SKPaint())
using (var src = new SKPaint())
using (var dst = new SKPaint())
using (var srcShader = SKShader.CreateLinearGradient(srcPoints [0], srcPoints [1], srcColors, null, SKShaderTileMode.Clamp))
using (var dstShader = SKShader.CreateLinearGradient(dstPoints [0], dstPoints [1], dstColors, null, SKShaderTileMode.Clamp)) {
text.TextSize = 12.0f;
text.IsAntialias = true;
text.TextAlign = SKTextAlign.Center;
stroke.IsStroke = true;
src.Shader = srcShader;
dst.Shader = dstShader;
canvas.Clear(SKColors.White);
for (var i = 0; i < modes.Length; ++i)
{
using (new SKAutoCanvasRestore(canvas, true)) {
canvas.Translate(w * (i / rows), h * (i % rows));
canvas.ClipRect(rect);
canvas.DrawColor(SKColors.LightGray);
canvas.SaveLayer(null);
canvas.Clear(SKColors.Transparent);
canvas.DrawPaint(dst);
src.XferMode = modes [i];
canvas.DrawPaint(src);
canvas.DrawRect(rect, stroke);
var desc = modes [i].ToString();
canvas.DrawText(desc, w / 2f, h / 2f, text);
}
}
}
}
public void DrawRect(float x, float y, float width, float height, PaintBrush paint) => _canvas.DrawRect(x, y, width, height, GetSKPaint(paint));
private void DrawBackgroundInternal(SKCanvas canvas, ArgbColor color, Rect2 rect)
{
using (SKPaint brush = ToSKPaintBrush(color))
{
SKRect srect = SKRect.Create(
_scaleToPage(rect.X),
_scaleToPage(rect.Y),
_scaleToPage(rect.Width),
_scaleToPage(rect.Height));
canvas.DrawRect(srect, brush);
}
}
private void DrawRectangleInternal(SKCanvas canvas, SKPaint brush, SKPaint pen, bool isStroked, bool isFilled, ref SKRect rect)
{
if (isFilled)
{
canvas.DrawRect(rect, brush);
}
if (isStroked)
{
canvas.DrawRect(rect, pen);
}
}
public static void Xfermode (SKCanvas canvas, int width, int height)
{
var modes = Enum.GetValues (typeof(SKXferMode)).Cast<SKXferMode> ().ToArray ();
var cols = width < height ? 3 : 5;
var rows = (modes.Length - 1) / cols + 1;
var w = (float)width / cols;
var h = (float)height / rows;
var rect = SKRect.Create (w, h);
var srcPoints = new[] {
new SKPoint (0.0f, 0.0f),
new SKPoint (w, 0.0f)
};
var srcColors = new [] {
SKColors.Magenta.WithAlpha (0),
SKColors.Magenta
};
var dstPoints = new [] {
new SKPoint (0.0f, 0.0f),
new SKPoint (0.0f, h)
};
var dstColors = new [] {
SKColors.Cyan.WithAlpha (0),
SKColors.Cyan
};
using (var text = new SKPaint ())
using (var stroke = new SKPaint ())
using (var src = new SKPaint ())
using (var dst = new SKPaint ())
using (var srcShader = SKShader.CreateLinearGradient (srcPoints [0], srcPoints [1], srcColors, null, SKShaderTileMode.Clamp))
using (var dstShader = SKShader.CreateLinearGradient (dstPoints [0], dstPoints [1], dstColors, null, SKShaderTileMode.Clamp)) {
text.TextSize = 12.0f;
text.IsAntialias = true;
text.TextAlign = SKTextAlign.Center;
stroke.IsStroke = true;
src.Shader = srcShader;
dst.Shader = dstShader;
canvas.Clear (SKColors.White);
for (var i = 0; i < modes.Length; ++i) {
using (new SKAutoCanvasRestore (canvas, true)) {
canvas.Translate (w * (i / rows), h * (i % rows));
canvas.ClipRect (rect);
canvas.DrawColor (SKColors.LightGray);
canvas.SaveLayer (null);
canvas.Clear (SKColors.Transparent);
canvas.DrawPaint (dst);
src.XferMode = modes [i];
canvas.DrawPaint (src);
canvas.DrawRect (rect, stroke);
var desc = modes [i].ToString ();
canvas.DrawText (desc, w / 2f, h / 2f, text);
}
}
}
}
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.DrawRect (rotatedRect, paint);
// undo transform / restore
canvas.Restore();
// draw
paint.Color = XamLtBlue;
canvas.DrawRect (rightRect, paint);
}
}
public void DrawRect(float x, float y, float width, float height, PaintBrush paint) => _canvas.DrawRect(x, y, width, height, paint.ToSkia());
private static void DrawRect(SKCanvas canvas, SKRect rect, SKPaint fillColor, SKPaint lineColor)
{
if ((fillColor != null) && fillColor.Color.Alpha != 0) canvas.DrawRect(rect, fillColor);
if ((lineColor != null) && lineColor.Color.Alpha != 0) canvas.DrawRect(rect, lineColor);
}
