|
public DrawColor ( |
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| color | ||
| mode | SKBlendMode | |
| return | void | |
public static void UnicodeText (SKCanvas canvas, int width, int height)
{
// stops at 0x530 on Android
string text = "\u03A3 and \u0750";
using (var paint = new SKPaint ())
using (var tf = SKTypeface.FromFamilyName ("Tahoma")) {
canvas.DrawColor (SKColors.White);
paint.IsAntialias = true;
paint.TextSize = 60;
paint.Typeface = tf;
canvas.DrawText (text, 50, 100, paint);
}
using (var paint = new SKPaint ())
using (var tf = SKTypeface.FromFamilyName ("Times New Roman")) {
paint.Color = XamDkBlue;
paint.IsAntialias = true;
paint.TextSize = 60;
paint.Typeface = tf;
canvas.DrawText (text, 50, 200, paint);
}
}
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 UnicodeText(SKCanvas canvas, int width, int height)
{
// stops at 0x530 on Android
string text = "\u03A3 and \u0750";
using (var paint = new SKPaint())
using (var tf = SKTypeface.FromFamilyName("Tahoma")) {
canvas.DrawColor(SKColors.White);
paint.IsAntialias = true;
paint.TextSize = 60;
paint.Typeface = tf;
canvas.DrawText(text, 50, 100, paint);
}
using (var paint = new SKPaint())
using (var tf = SKTypeface.FromFamilyName("Times New Roman")) {
paint.Color = XamDkBlue;
paint.IsAntialias = true;
paint.TextSize = 60;
paint.Typeface = tf;
canvas.DrawText(text, 50, 200, paint);
}
}
// https://fiddle.skia.org/c/3523e95a9f8b96228b6b4bdd5409cb94
public static void TextSample(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.IsStroke = false;
canvas.DrawText("Skia", width / 2f, 64.0f, paint);
}
using (var paint = new SKPaint()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor(0x9C, 0xAF, 0xB7);
paint.IsStroke = true;
paint.StrokeWidth = 3;
paint.TextAlign = SKTextAlign.Center;
canvas.DrawText("Skia", width / 2f, 144.0f, paint);
}
using (var paint = new SKPaint()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor(0xE6, 0xB8, 0x9C);
paint.TextScaleX = 1.5f;
paint.TextAlign = SKTextAlign.Right;
canvas.DrawText("Skia", width / 2f, 224.0f, paint);
}
}
public static void BlurMaskFilter(SKCanvas canvas, int width, int height)
{
canvas.DrawColor(SKColors.White);
using (var paint = new SKPaint())
using (var filter = SKMaskFilter.CreateBlur(SKBlurStyle.Normal, 5.0f))
{
paint.IsAntialias = true;
paint.TextSize = 120;
paint.TextAlign = SKTextAlign.Center;
paint.MaskFilter = filter;
canvas.DrawText("Skia", width / 2f, height / 2f, paint);
}
}
public static void EmbossMaskFilter(SKCanvas canvas, int width, int height)
{
canvas.DrawColor(SKColors.White);
SKPoint3 direction = new SKPoint3(1.0f, 1.0f, 1.0f);
using (var paint = new SKPaint())
using (var filter = SKMaskFilter.CreateEmboss(2.0f, direction, 0.3f, 0.1f))
{
paint.IsAntialias = true;
paint.TextSize = 120;
paint.TextAlign = SKTextAlign.Center;
paint.MaskFilter = filter;
canvas.DrawText("Skia", width / 2f, height / 2f, paint);
}
}
} // End Sub DrawWithoutSurface
public void DrawImageToCanvas(string fileName, SkiaSharp.SKCanvas canvas)
{
// Clear the canvas / Fill with white
canvas.DrawColor(SKColors.White);
using (System.IO.Stream fileStream = System.IO.File.OpenRead(fileName))
{
// decode the bitmap from the stream
using (SKManagedStream stream = new SKManagedStream(fileStream))
{
using (SKBitmap bitmap = SKBitmap.Decode(stream))
{
using (SKPaint paint = new SKPaint())
{
canvas.DrawBitmap(bitmap, SKRect.Create(Width, Height), paint);
} // End using paint
} // End using bitmap
} // End Using stream
} // End Using fileStream
} // End Sub DrawImageToCanvas
// ExStart:RenderShapeToGraphics
public static string RenderShapeToGraphics(string dataDir, Shape shape)
{
ShapeRenderer r = shape.GetShapeRenderer();
// Find the size that the shape will be rendered to at the specified scale and resolution.
Size shapeSizeInPixels = r.GetSizeInPixels(1.0f, 96.0f);
// Rotating the shape may result in clipping as the image canvas is too small. Find the longest side
// And make sure that the graphics canvas is large enough to compensate for this.
int maxSide = System.Math.Max(shapeSizeInPixels.Width, shapeSizeInPixels.Height);
using (SkiaSharp.SKBitmap bitmap = new SkiaSharp.SKBitmap((int)(maxSide * 1.25), (int)(maxSide * 1.25)))
{
// Rendering to a graphics object means we can specify settings and transformations to be applied to
// The shape that is rendered. In our case we will rotate the rendered shape.
using (SkiaSharp.SKCanvas gr = new SkiaSharp.SKCanvas(bitmap))
{
// Clear the shape with the background color of the document.
gr.DrawColor(new SkiaSharp.SKColor(shape.Document.PageColor.R, shape.Document.PageColor.G, shape.Document.PageColor.B, shape.Document.PageColor.A));
// Center the rotation using translation method below
gr.Translate((float)bitmap.Width / 8, (float)bitmap.Height / 2);
// Rotate the image by 45 degrees.
gr.RotateDegrees(45);
// Undo the translation.
gr.Translate(-(float)bitmap.Width / 8, -(float)bitmap.Height / 2);
// Render the shape onto the graphics object.
r.RenderToSize(gr, 0, 0, shapeSizeInPixels.Width, shapeSizeInPixels.Height);
}
// Save output to file.
using (System.IO.FileStream fs = System.IO.File.Create(dataDir + "/RenderToSize_Out.png"))
{
SKData d = SKImage.FromBitmap(bitmap).Encode(SKEncodedImageFormat.Png, 100);
d.SaveTo(fs);
}
}
return("\nShape rendered to graphics successfully.\nFile saved at " + dataDir);
}
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 static void EmbossMaskFilter(SKCanvas canvas, int width, int height)
{
canvas.DrawColor(SKColors.White);
SKPoint3 direction = new SKPoint3(1.0f, 1.0f, 1.0f);
using (var paint = new SKPaint())
using (var filter = SKMaskFilter.CreateEmboss(2.0f, direction, 0.3f, 0.1f))
{
paint.IsAntialias = true;
paint.TextSize = 120;
paint.TextAlign = SKTextAlign.Center;
paint.MaskFilter = filter;
canvas.DrawText("Skia", width / 2f, height / 2f, paint);
}
}
public static void BlurMaskFilter(SKCanvas canvas, int width, int height)
{
canvas.DrawColor(SKColors.White);
using (var paint = new SKPaint())
using (var filter = SKMaskFilter.CreateBlur(SKBlurStyle.Normal, 5.0f))
{
paint.IsAntialias = true;
paint.TextSize = 120;
paint.TextAlign = SKTextAlign.Center;
paint.MaskFilter = filter;
canvas.DrawText("Skia", width / 2f, height / 2f, 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);
}
}
}
}
// https://fiddle.skia.org/c/3523e95a9f8b96228b6b4bdd5409cb94
public static void TextSample (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.IsStroke = false;
canvas.DrawText ("Skia", width / 2f, 64.0f, paint);
}
using (var paint = new SKPaint ()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor (0x9C, 0xAF, 0xB7);
paint.IsStroke = true;
paint.StrokeWidth = 3;
paint.TextAlign = SKTextAlign.Center;
canvas.DrawText ("Skia", width / 2f, 144.0f, paint);
}
using (var paint = new SKPaint ()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor (0xE6, 0xB8, 0x9C);
paint.TextScaleX = 1.5f;
paint.TextAlign = SKTextAlign.Right;
canvas.DrawText ("Skia", width / 2f, 224.0f, paint);
}
}
