public static bool TryDrawWallOrFloor(this string tile, string background, SKBitmap wall, SKBitmap floor, string[] wallAndFloorColors, out SKBitmap tileToDraw)
{
var highlighted = FixHighlight(tile, background, out var correctTile);
tileToDraw = new SKBitmap(32, 32);
using (SKCanvas g = new SKCanvas(tileToDraw))
{
if (correctTile == "#BLUE")
{
g.DrawBitmap(wall, new SKRect(0, 0, wall.Width, wall.Height));
g.DrawColor(new SKColor(0, 0, 0, 150), SKBlendMode.Overlay);
return(true);
}
if (correctTile[0] == '#' && correctTile.Substring(1).Equals(wallAndFloorColors[0]))
{
g.DrawBitmap(wall, new SKRect(0, 0, wall.Width, wall.Height));
return(true);
}
if (correctTile == ".BLUE")
{
g.DrawBitmap(floor, new SKRect(0, 0, floor.Width, floor.Height));
g.DrawColor(new SKColor(0, 0, 0, 150), SKBlendMode.Overlay);
return(true);
}
if (correctTile[0] == '.' && correctTile.Substring(1).Equals(wallAndFloorColors[1]))
{
g.DrawBitmap(floor, new SKRect(0, 0, floor.Width, floor.Height));
return(true);
}
if (correctTile == "*BLUE")
{
g.DrawBitmap(wall, new SKRect(0, 0, wall.Width, wall.Height));
g.DrawColor(new SKColor(40, 30, 30, 200), SKBlendMode.Overlay);
return(true);
}
if (correctTile == ",BLUE")
{
g.DrawBitmap(floor, new SKRect(0, 0, floor.Width, floor.Height));
g.DrawColor(new SKColor(40, 20, 20, 200), SKBlendMode.Overlay);
return(true);
}
}
return(false);
}
protected override void OnDrawSample(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 = SampleMedia.Colors.XamarinDarkBlue;
paint.IsAntialias = true;
paint.TextSize = 60;
paint.Typeface = tf;
canvas.DrawText(text, 50, 200, paint);
}
}
private void OnPaintSurface(SKCanvas canvas, int width, int height)
{
var scaledSize = new SKSize(width / _displayScale, height / _displayScale);
// handle the device screen density
canvas.Scale(_displayScale);
var canvasWidth = scaledSize.Width; //width;
var canvasHeight = scaledSize.Height; //height;
using (var paint = new SKPaint())
{
// clear the canvas / fill with white
canvas.DrawColor(SKColors.White);
//var RulerWidth = 50;
//var LargeSteps = 50;
//var SmallSteps = 10;
//var drawHorizontalRuler = true;
//if (drawHorizontalRuler)
//{
// DrawHorizontalRuler(canvas, canvasWidth, RulerWidth, LargeSteps, SmallSteps);
//}
//DrawGrid(canvas, canvasWidth, canvasHeight, paint);
foreach (var layer in _layers)
{
layer.RenderItem.Paint(canvas);
}
}
}
public async ValueTask <byte[]> GetBytesWithFilterAsync(
int size,
string topic = null,
SKImageFilter imageFilter = null,
SKColorFilter colorFilter = null,
SKShader shader = null,
SKBlendMode blendMode = SKBlendMode.Overlay)
{
Trace.WriteLine("Start");
string url;
if (string.IsNullOrEmpty(topic))
{
url = string.Format(URL_PATTERN_RND, size);
}
else
{
url = string.Format(URL_PATTERN, size, topic);
}
var imageInfo = new SKImageInfo(size, size);
using (var http = new HttpClient())
{
var image = await http.GetByteArrayAsync(url);//.ConfigureAwait(false);
Trace.WriteLine("Downloaded");
using (var outStream = new MemoryStream())
using (var bitmap = SKBitmap.Decode(image, imageInfo))
using (var surface = SKSurface.Create(imageInfo))
using (var paint = new SKPaint())
{
SKCanvas canvas = surface.Canvas;
canvas.DrawColor(SKColors.White);
if (imageFilter != null)
{
paint.ImageFilter = imageFilter;
}
if (colorFilter != null)
{
paint.ColorFilter = colorFilter;
}
// draw the bitmap through the filter
var rect = SKRect.Create(imageInfo.Size);
canvas.DrawBitmap(bitmap, rect, paint);
if (shader != null)
{
paint.Shader = shader;
paint.BlendMode = blendMode;
canvas.DrawPaint(paint);
}
SKData data = surface.Snapshot().Encode(SKEncodedImageFormat.Jpeg, 80);
data.SaveTo(outStream);
byte[] manipedImage = outStream.ToArray();
Trace.WriteLine("End");
return(manipedImage);
}
}
}
/// <summary>
/// 将生成的字符串写入图像文件
/// </summary>
/// <param name="code">验证码字符串</param>
/// <param name="length">生成位数（默认4位）</param>
public static byte[] Create(out string code, int length = 4)
{
code = RandomCode(length);
byte[] imageBytes;
int imageX = 85;
int imageY = 32;
using (SKBitmap image = new SKBitmap(imageX, imageY, SKColorType.Bgra8888, SKAlphaType.Premul))
{
using (SKCanvas canvas = new SKCanvas(image))
{
canvas.DrawColor(SKColors.Gray);
using (SKPaint drawStyle = CreatePaint())
{
canvas.DrawText(code, 10, imageY - 10, drawStyle);
}
using (SKImage img = SKImage.FromBitmap(image))
{
using (SKData p = img.Encode(SKEncodedImageFormat.Png, 100))
{
imageBytes = p.ToArray();
}
}
}
}
return(imageBytes);
}
// This code uses System.Drawing to merge images and render text on the image
// System.Drawing SHOULD NOT be used in a production application
// It is not supported in server scenarios and is used here as a demo only!
public static void MergeCardImage(string cardPath, byte[] imageBytes, Stream outputStream, string personName, string personTitle, double score)
{
using (MemoryStream faceImageStream = new MemoryStream(imageBytes)) {
using (var surface = SKSurface.Create(width: CardWidth, height: CardHeight, colorType: SKImageInfo.PlatformColorType, alphaType: SKAlphaType.Premul)) {
SKCanvas canvas = surface.Canvas;
canvas.DrawColor(SKColors.White); // clear the canvas / fill with white
using (var fileStream = File.OpenRead(cardPath))
using (var stream = new SKManagedStream(fileStream)) // decode the bitmap from the stream
using (var cardBack = SKBitmap.Decode(stream))
using (var face = SKBitmap.Decode(imageBytes))
using (var paint = new SKPaint()) {
canvas.DrawBitmap(cardBack, SKRect.Create(0, 0, CardWidth, CardHeight), paint);
canvas.DrawBitmap(face, SKRect.Create(TopLeftFaceX, TopLeftFaceY, FaceWidth, FaceWidth));
RenderText(canvas, NameFontSize, NameTextX, NameTextY, NameWidth, personName);
RenderText(canvas, TitleFontSize, NameTextX, TitleTextY, NameWidth, personTitle);
RenderScore(canvas, ScoreX, ScoreY, ScoreWidth, score.ToString());
canvas.Flush();
using (var jpgImage = surface.Snapshot().Encode(SKEncodedImageFormat.Jpeg, 80)) {
jpgImage.SaveTo(outputStream);
}
}
}
}
}
private new void DrawBackground(SKCanvas c)
{
c.DrawRect(new SKRect(Margin, Margin, Width - Margin, Height - Margin),
new SKPaint
{
IsAntialias = true, FilterQuality = SKFilterQuality.High,
Shader = SKShader.CreateRadialGradient(new SKPoint(Width / 2, Height / 2), Width / 5 * 2,
new[] { Background[0], Background[1] },
SKShaderTileMode.Clamp)
});
for (var i = 0; i < _backgroundOverlay.Width; i++)
{
for (var j = 0; j < _backgroundOverlay.Height; j++)
{
if (_backgroundOverlay.GetPixel(i, j) == SKColors.Black)
{
_backgroundOverlay.SetPixel(i, j, SKColors.Transparent);
}
}
}
c.DrawBitmap(_backgroundOverlay, new SKRect(Margin, Margin, Width - Margin, Height - Margin), new SKPaint
{
IsAntialias = true,
ColorFilter = SKColorFilter.CreateBlendMode(SKColors.Black.WithAlpha(150), SKBlendMode.DstIn),
ImageFilter = SKImageFilter.CreateDropShadow(2, 2, 4, 4, new SKColor(0, 0, 0))
});
c.DrawColor(SKColors.Black.WithAlpha(125), SKBlendMode.DstIn);
}
private void surface_PaintSurface(object sender, SkiaSharp.Views.Desktop.SKPaintSurfaceEventArgs e)
{
if (!enabled)
{
return;
}
SKCanvas canvas = e.Surface.Canvas;
canvas.Clear();
float width = e.Info.Width;
float height = e.Info.Height;
// Draw axis
canvas.DrawColor(SKColors.LightGray);
canvas.DrawLine(0, 0, 0, height, black);
canvas.DrawLine(0, height - 1.5f, width, height - 1.5f, black);
canvas.DrawText("X2", 28.0f, 35.0f, black);
canvas.DrawText("X1", width - 45.0f, height - 35.0f, black);
// Draw dots
foreach (SKPoint pt in red_points)
{
canvas.DrawCircle(pt, 5, red);
}
foreach (SKPoint pt in blue_points)
{
canvas.DrawCircle(pt, 5, blue);
}
}
private void DrawCore(string captcha, Action <SKData> postAction)
{
var sizeAndPoints = ComputeSizeAndPoints(captcha);
var imageSize = sizeAndPoints.Size;
var imageInfo = new SKImageInfo(imageSize.Width, imageSize.Height,
SKColorType.Bgra8888, SKAlphaType.Premul);
using (var bmp = new SKBitmap(imageInfo))
using (var canvas = new SKCanvas(bmp))
{
// Clear
canvas.DrawColor(_backgroundColor);
// 绘制噪点
var points = _options.Captcha.BackgroundNoise.CreatePoints(imageSize);
canvas.DrawPoints(SKPointMode.Points, points, _noisePaint);
// 绘制验证码
foreach (var p in sizeAndPoints.Points)
{
var i = p.Key;
var character = p.Value.Key;
var point = p.Value.Value;
canvas.DrawText(character, point.X, point.Y,
i % 2 > 0 ? _alternPaint : _forePaint);
}
using (var img = SKImage.FromBitmap(bmp))
using (var data = img.Encode(_imageFormat, _options.EncodeQuality))
{
postAction(data);
}
}
}
private static byte[] GenerateImage()
{
using (SKBitmap bitmap = new SKBitmap(width: 200, height: 200))
{
using (SKCanvas canvas = new SKCanvas(bitmap))
{
var random = new Random();
canvas.DrawColor(SKColor.FromHsl(random.Next(0, 360), 100, 50));
using (var paint = new SKPaint()
{
TextSize = 25.0f,
IsAntialias = true,
Color = new SKColor(0, 0, 0),
Style = SKPaintStyle.Fill,
TextAlign = SKTextAlign.Center
})
{
canvas.DrawText(DateTime.Now.ToString("T"), 100, 100, paint);
}
using (SKData data = SKImage.FromBitmap(bitmap).Encode(SKEncodedImageFormat.Png, 100))
{
return(data.ToArray());
}
}
}
}
public static void CreateLandscapeImage(string input, string output)
{
using (var bitmap = SKBitmap.Decode(input))
{
float newWidth = (float)666 / (float)bitmap.Width;
float newHeight = (float)370 / (float)bitmap.Height;
float scale = Math.Min(newHeight, newWidth);
using (var scaledBitmap = bitmap.Resize(new SKImageInfo((int)(bitmap.Width * scale), (int)(bitmap.Height * scale)), SKBitmapResizeMethod.Lanczos3))
{
var toBitmap = new SKBitmap(676, 380);
var canvas = new SKCanvas(toBitmap);
var x = (676 - scaledBitmap.Width) / 2;
var y = (380 - scaledBitmap.Height) / 2;
canvas.DrawColor(SKColors.White);
canvas.DrawBitmap(scaledBitmap, x, y);
canvas.Flush();
using (var image = SKImage.FromBitmap(toBitmap))
{
using (var png = image.Encode(SKEncodedImageFormat.Png, 100))
{
using (var filestream = File.OpenWrite(output))
{
png.SaveTo(filestream);
}
}
}
}
}
}
protected override void OnDrawSample(SKCanvas canvas, int width, int height)
{
canvas.DrawColor(SKColors.White);
var rect = SKRect.Create(width / 3, height / 3, width / 3, height / 3);
float occluderHeight = 2.0f;
SKPoint3 lightPos = new SKPoint3(0, 0, 50);
float lightWidth = 500;
float ambientAlpha = 0.75f;
float spotAlpha = 0.75f;
using (var paint = new SKPaint())
using (var filter = SKMaskFilter.CreateShadow(occluderHeight, lightPos, lightWidth, ambientAlpha, spotAlpha))
{
paint.IsAntialias = true;
paint.Color = SKColors.Black;
paint.MaskFilter = filter;
// draw the shadow
canvas.DrawRect(rect, paint);
paint.Color = SKColors.DarkBlue;
paint.MaskFilter = null;
// draw the rectangle
canvas.DrawRect(rect, paint);
}
}
public static void Draw(this SKPicture skPicture, SKColor background, float scaleX, float scaleY, SKCanvas skCanvas)
{
skCanvas.DrawColor(background);
skCanvas.Save();
skCanvas.Scale(scaleX, scaleY);
skCanvas.DrawPicture(skPicture);
skCanvas.Restore();
}
/// <summary>
/// Draws the provided path in filled mode with the provided color and alpha.
/// Special thanks to Angelo Suzuki (https://github.com/tinsukE) for this.
protected void DrawFilledPath(SKCanvas c, SKPath filledPath, SKColor fillColor, byte fillAlpha)
{
int save = c.Save();
c.ClipPath(filledPath);
c.DrawColor(fillColor.WithAlpha(fillAlpha), SKBlendMode.SrcOver);
c.RestoreToCount(save);
}
public static SKBitmap ApplyMask(this SKBitmap bitmap, SKColor color)
{
var skCanvas = new SKCanvas(bitmap);
skCanvas.DrawColor(color, SKBlendMode.SrcIn);
skCanvas.Flush();
skCanvas.Save();
return(bitmap);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public static byte[] GetCode(out string code)
{
#region 反射SK支持的全部颜色
//List<SKColor> colors = new List<SKColor>();
//var skcolors = new SKColors();
//var type = skcolors.GetType();
//foreach (FieldInfo field in type.GetFields())
//{
// colors.Add( (SKColor)field.GetValue(skcolors));
//}
#endregion
//int maxcolorindex = colors.Count-1;
byte[] imageBytes = null;
code = GenerateRandomNumber(4, DateTime.Now.Second);
var zu = code.ToList();
SKBitmap bmp = new SKBitmap(80, 30);
using (SKCanvas canvas = new SKCanvas(bmp))
{
//背景色
canvas.DrawColor(SKColors.White);
using (SKPaint sKPaint = new SKPaint())
{
sKPaint.TextSize = 16; //字体大小
sKPaint.IsAntialias = true; //开启抗锯齿
sKPaint.Typeface = SKTypeface.FromFamilyName("微软雅黑", SKTypefaceStyle.Bold); //字体
SKRect size = new SKRect();
sKPaint.MeasureText(zu[0].ToString(), ref size); //计算文字宽度以及高度
float temp = (bmp.Width / 4 - size.Size.Width) / 2;
float temp1 = bmp.Height - (bmp.Height - size.Size.Height) / 2;
Random random = new Random();
for (int i = 0; i < 4; i++)
{
sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));
canvas.DrawText(zu[i].ToString(), temp + 20 * i, temp1, sKPaint);//画文字
}
//干扰线
for (int i = 0; i < 5; i++)
{
sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));
canvas.DrawLine(random.Next(0, 40), random.Next(1, 29), random.Next(41, 80), random.Next(1, 29), sKPaint);
}
}
//页面展示图片
using (SKImage img = SKImage.FromBitmap(bmp))
{
using (SKData p = img.Encode())
{
imageBytes = p.ToArray();
}
}
return(imageBytes);
}
}
public IActionResult ValidateCode()
{
#region 反射SK支持的全部颜色
//List<SKColor> colors = new List<SKColor>();
//var skcolors = new SKColors();
//var type = skcolors.GetType();
//foreach (FieldInfo field in type.GetFields())
//{
// colors.Add( (SKColor)field.GetValue(skcolors));
//}
#endregion
//int maxcolorindex = colors.Count-1;
string text = Bucket.Utility.Helpers.Randoms.CreateRandomValue(5, false);
var zu = text.ToList();
SKBitmap bmp = new SKBitmap(100, 50);
using (SKCanvas canvas = new SKCanvas(bmp))
{
//背景色
canvas.DrawColor(SKColors.White);
using (SKPaint sKPaint = new SKPaint())
{
sKPaint.TextSize = 24; //字体大小
sKPaint.IsAntialias = true; //开启抗锯齿
sKPaint.Typeface = SKTypeface.FromFamilyName("Arial", SKTypefaceStyle.Bold); //字体
SKRect size = new SKRect();
sKPaint.MeasureText(zu[0].ToString(), ref size); //计算文字宽度以及高度
float temp = (bmp.Width / 4 - size.Size.Width) / 2;
float temp1 = bmp.Height - (bmp.Height - size.Size.Height) / 2;
Random random = new Random();
for (int i = 0; i < zu.Count; i++)
{
sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));
sKPaint.TextSkewX = (float)random.Next(0, 2);
canvas.DrawText(zu[i].ToString(), temp + 20 * i, temp1 + random.Next(-5, 5), sKPaint);//画文字
}
//干扰线
for (int i = 0; i < 5; i++)
{
sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));
canvas.DrawLine(random.Next(0, 40), random.Next(1, 29), random.Next(41, 80), random.Next(1, 29), sKPaint);
}
}
//页面展示图片
using (SKImage img = SKImage.FromBitmap(bmp))
{
using (SKData p = img.Encode())
{
return(File(p.ToArray(), "image/Png"));
}
}
}
}
public static void bar()
{
// SKImageInfo nfo = new SKImageInfo();
// SKBitmap bmp = new SKBitmap(300, 300, SKColorType.Rgba8888, SKAlphaType.Opaque);
SKBitmap bmp = new SKBitmap(300, 300, SKColorType.Bgra8888, SKAlphaType.Premul);
using (SKCanvas canvas = new SKCanvas(bmp))
{
canvas.DrawColor(SKColors.White); // Clear
}
}
/// <summary>
/// 生成验证码
/// </summary>
/// <returns>返回生成图片的二进制数据</returns>
public override byte[] CreateCode()
{
byte[] codeImageBinary = new byte[0];
#region 获取验证码的值
string codeString = CreateCodeString();//创建一个新的验证码值
if (string.IsNullOrWhiteSpace(codeString))
{
return(codeImageBinary);
}
this.code = codeString;
#endregion
#region 生成图片
int width = (this.fontSize + spaceBetween) * this.length + 5;
int height = this.fontSize + 11;
using (SKBitmap bitmap = new SKBitmap(width, height))
{
using (SKCanvas canvas = new SKCanvas(bitmap))
{
canvas.Clear();
canvas.DrawColor(new SKColor(backgroundColor.R, backgroundColor.G, backgroundColor.B, backgroundColor.A));
using (var paint = new SKPaint())
{
for (int n = 0; n < this.length; n++)
{
paint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));
paint.TextSize = fontSize;
canvas.DrawText(codeString[n].ToString(), n * fontSize + spaceBetween, bitmap.Height - (bitmap.Height - fontSize) / 2, paint);
}
//干扰线
for (int i = 0; i < 5; i++)
{
paint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));
canvas.DrawLine(random.Next(0, 40), random.Next(1, 29), random.Next(41, 80), random.Next(1, 29), paint);
}
}
using (var image = SKImage.FromBitmap(bitmap))
{
using (var skdata = image.Encode(SKEncodedImageFormat.Png, 100))
{
codeImageBinary = skdata.ToArray();
}
}
}
}
#endregion
return(codeImageBinary);
}
private void DrawPathCContent(SKCanvas canvas)
{
canvas.Save();
GetPathA((float)Width, (float)Height);
_region.SetRect(ToSKRectI(canvas.LocalClipBounds));
ClipRegion(_region, _pathA);
ClipRegion(_region, GetPathC(), SKRegionOperation.ReverseDifference);
canvas.ClipRegion(_region);
canvas.DrawColor(SKColors.Green);
canvas.Restore();
}
public void DrawCore(string captcha, Action <SKData> postAction)
{
Logger.LogInformation($"Captcha text: {captcha}");
var colors = Options.Captcha.Colors;
var sizeAndPoints = ComputeSizeAndPoints(captcha);
var imageSize = sizeAndPoints.Size;
var imageInfo = new SKImageInfo(imageSize.Width, imageSize.Height,
SKColorType.Bgra8888, SKAlphaType.Premul);
using (var bmp = new SKBitmap(imageInfo))
using (var canvas = new SKCanvas(bmp))
{
// Clear
canvas.DrawColor(colors.Background);
// 绘制噪点
using (var noisePaint = CreateNoisePaint())
{
var points = CreateNoisePoints(imageSize);
canvas.DrawPoints(SKPointMode.Points, points, noisePaint);
}
// 绘制验证码
using (var forePaint = CreatePaint(colors.Fore))
using (var alternPaint = CreatePaint(colors.Alternate))
{
foreach (var p in sizeAndPoints.Points)
{
var i = p.Key;
var character = p.Value.Key;
var point = p.Value.Value;
canvas.DrawText(character, point.X, point.Y,
i % 2 > 0 ? alternPaint : forePaint);
}
}
using (var img = SKImage.FromBitmap(bmp))
using (var data = img.Encode(CurrentImageFormat, Options.Quality))
{
if (data.IsNull())
{
throw new InvalidOperationException(InternalResource.InvalidOperationExceptionUnsupportedImageFormat);
}
postAction.Invoke(data);
}
}
}
public static void DrawSample(SKCanvas canvas, int width, int height)
{
canvas.DrawColor(SKColors.White);
using (var paint = new SKPaint())
{
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = (SKColor)0xFF4281A4;
paint.IsStroke = false;
canvas.DrawText("SkiaSharp", width / 2f, height / 2f, paint);
}
}
public static byte[] CreateByteByImgVerifyCode(string verifyCode, int width, int height)
{
byte[] bytes;
var text = verifyCode.ToUpper().ToList();
SKBitmap bmp = new SKBitmap(width, height);
using (SKCanvas canvas = new SKCanvas(bmp))
{
// 背景色
canvas.DrawColor(SKColors.White);
using (SKPaint sKPaint = new SKPaint())
{
sKPaint.TextSize = 18; // 字体大小
sKPaint.FakeBoldText = true;
sKPaint.IsAntialias = true; // 开启抗锯齿
sKPaint.Typeface = SKTypeface.FromFamilyName("WenQuanYi Micro Hei", SKTypefaceStyle.Normal); //字体
SKRect size = new SKRect();
sKPaint.MeasureText(text[0].ToString(), ref size); // 计算文字宽度以及高度
float _x = (width - size.Width * text.Count) / 2 - size.Width;
float _y = size.Height;
int num = Next(0, 9);
sKPaint.Color = colors[num];
// 干扰线
for (int i = 0; i < 3; i++)
{
canvas.DrawLine(Next(0, 40), Next(1, 29), Next(41, 80), Next(1, 29), sKPaint);
}
// 文字
for (int i = 0; i < text.Count; i++)
{
_x += size.Width + Next(0, 3);
_y = size.Height + Next(5, 15);
canvas.DrawText(text[i].ToString(), _x, _y, sKPaint); // 画文字
}
}
// 页面展示图片
using (SKImage img = SKImage.FromBitmap(bmp))
{
using (SKData p = img.Encode())
{
bytes = p.ToArray();
}
}
}
return(bytes);
}
protected override void OnDrawSample(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("SkiaSharp", width / 2f, height / 2f, paint);
}
}
public static byte[] CreateCaptcha(string code)
{
var charList = code.ToList();
var bmp = new SKBitmap((charList.Count() * 20), 30);
using (var canvas = new SKCanvas(bmp))
{
//背景色
canvas.DrawColor(SKColors.White);
using (SKPaint sKPaint = new SKPaint())
{
sKPaint.TextSize = 16; //字体大小
sKPaint.IsAntialias = true; //开启抗锯齿
sKPaint.Typeface = SKTypeface.FromFamilyName("微软雅黑");
var size = new SKRect();
sKPaint.MeasureText(charList[0].ToString(), ref size);
var temp = (bmp.Width / 4 - size.Size.Width) / 2;
var temp1 = bmp.Height - (bmp.Height - size.Size.Height) / 2;
var random = new Random();
//画文字
for (int i = 0; i < charList.Count; i++)
{
sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255),
(byte)random.Next(0, 255));
canvas.DrawText(charList[i].ToString(), temp + 20 * i, temp1, sKPaint);
}
//画干扰线
for (int i = 0; i < 3; i++)
{
sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255),
(byte)random.Next(0, 255));
canvas.DrawLine(random.Next(0, 40), random.Next(1, 29), random.Next(41, 80), random.Next(1, 29),
sKPaint);
}
}
}
using (SKImage img = SKImage.FromBitmap(bmp))
{
using (SKData p = img.Encode())
{
return(p.ToArray());
}
}
}
private void Draw(SKCanvas canvas)
{
canvas.DrawColor(new SKColor(255, 255, 255));
foreach (var figure in _completedInOuts.Concat(_editingInOuts))
{
DrawInOut(canvas, figure);
}
foreach (var figure in _completedSquares.Concat(_editingSquares))
{
DrawSquare(canvas, figure);
}
foreach (var figure in _completedEllipses.Concat(_editingEllipses))
{
DrawEllipse(canvas, figure);
}
}
public static void CreatePosterImage(string input, string output)
{
try
{
using (var bitmap = SKBitmap.Decode(input))
{
if (bitmap != null)
{
float newWidth = (float)530 / (float)bitmap.Width;
float newHeight = (float)800 / (float)bitmap.Height;
float scale = Math.Min(newHeight, newWidth);
using (var scaledBitmap = bitmap.Resize(new SKImageInfo((int)(bitmap.Width * scale), (int)(bitmap.Height * scale)), SKBitmapResizeMethod.Lanczos3))
{
if (scaledBitmap != null)
{
var toBitmap = new SKBitmap(540, 810);
var canvas = new SKCanvas(toBitmap);
var x = (540 - scaledBitmap.Width) / 2;
var y = (810 - scaledBitmap.Height) / 2;
canvas.DrawColor(SKColors.White);
canvas.DrawBitmap(scaledBitmap, x, y);
canvas.Flush();
using (var image = SKImage.FromBitmap(toBitmap))
{
using (var png = image.Encode(SKEncodedImageFormat.Png, 100))
{
using (var filestream = File.OpenWrite(output))
{
png.SaveTo(filestream);
}
}
}
}
}
}
}
}
catch
{
Plugin.Logger.Info("IMAGEHELPER > Could not create Poster Image: {0}", output);
}
}
protected override void OnDrawSample(SKCanvas canvas, int width, int height)
{
canvas.DrawColor(SKColors.White);
using var tf = SKFontManager.Default.MatchCharacter('م') ?? SKTypeface.FromStream(SampleMedia.Fonts.EmbeddedFont);
using var paint = new SKPaint { IsAntialias = true, TextSize = 64 };
using var arabicPaint = new SKPaint { IsAntialias = true, TextSize = 64, Typeface = tf };
// unshaped
canvas.DrawText("Unshaped:", 100, 100, paint);
canvas.DrawText("مرحبا بالعالم", 100, 180, arabicPaint);
// shaped
using var shaper = new SKShaper(tf);
canvas.DrawText("Shaped:", 100, 300, paint);
canvas.DrawShapedText(shaper, "مرحبا بالعالم", 100, 380, arabicPaint);
}
internal static byte[] GetCaptcha(string captchaText, string file = null)
{
byte[] imageBytes;
int image2d_x;
int image2d_y;
int compensateDeepCharacters;
using (var drawStyle = CreatePaint()) {
compensateDeepCharacters = (int)drawStyle.TextSize / 5;
if (StringComparer.Ordinal.Equals(captchaText, captchaText.ToUpperInvariant()))
{
compensateDeepCharacters = 0;
}
var size = SkiaHelpers.MeasureText(captchaText, drawStyle);
image2d_x = (int)size.Width + 10;
image2d_y = (int)size.Height + 10 + compensateDeepCharacters;
}
using (var image2d = new SKBitmap(image2d_x, image2d_y, SKColorType.Bgra8888, SKAlphaType.Premul)) {
using (var canvas = new SKCanvas(image2d)) {
canvas.DrawColor(SKColors.Black); // Clear
using (var drawStyle = CreatePaint()) {
canvas.DrawText(captchaText, 0 + 5, image2d_y - 5 - compensateDeepCharacters, drawStyle);
}
using (var img = SKImage.FromBitmap(image2d)) {
if (file != null)
{
using (var output = File.OpenWrite(file)) {
img.Encode(SKEncodedImageFormat.Jpeg, 75).SaveTo(output);
}
}
using (var p = img.Encode(SKEncodedImageFormat.Png, 100)) {
imageBytes = p.ToArray();
}
}
}
}
return(imageBytes);
}
protected override void OnDrawSample(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("SkiaSharp", width / 2f, height / 2f, paint);
}
}
