/// <summary>
/// Create sprite atlas from a string
/// </summary>
/// <param name="json">String with Json sprite file information</param>
/// <param name="atlas">SKImage of sprite atlas</param>
private void CreateSprites(string json, SKImage atlas)
{
var sprites = JsonConvert.DeserializeObject <Dictionary <string, Json.JsonSprite> >(json);
foreach (var sprite in sprites)
{
// Extract sprite from atlas
var image = atlas.Subset(new SKRectI(sprite.Value.X,
sprite.Value.Y,
sprite.Value.X + sprite.Value.Width,
sprite.Value.Y + sprite.Value.Height));
AddSprite(sprite.Key, new MGLSprite(sprite, image));
}
}
private async void HandlePaintCanvas(object sender, SKPaintSurfaceEventArgs e)
{
SKImageInfo info = e.Info;
SKCanvas canvas = e.Surface.Canvas;
canvas.Clear();
if (_doSave)
{
using (var hole = new SKPath()) {
hole.AddCircle(info.Width / 2, info.Height / 2, info.Width / 3);
canvas.ClipPath(hole, antialias: true);
}
}
canvas.SetMatrix(_m);
//Draw ball image
SKSize imgSize = new SKSize(_bitmap.Width, _bitmap.Height);
SKRect aspectRect = SKRect.Create(info.Width, info.Height).AspectFit(imgSize);
canvas.DrawBitmap(_bitmap, aspectRect);
if (!_doSave)
{
canvas.ResetMatrix();
//Draw circle overlay
using (var frame = new SKPath())
using (var hole = new SKPath()) {
frame.AddRect(info.Rect);
hole.AddCircle(info.Width / 2, info.Height / 2, info.Width / 3);
SKPath frameHole = frame.Op(hole, SKPathOp.Difference);
using (var p = new SKPaint {
IsAntialias = true, Style = SKPaintStyle.Fill, Color = new SKColor(128, 128, 128, 200)
}) {
canvas.DrawPath(frameHole, p);
}
}
}
else
{
SKImage snapI = e.Surface.Snapshot();
snapI = snapI.Subset(canvas.DeviceClipBounds);
SKData pngImage = snapI.Encode();
File.WriteAllBytes(_ballFilename, pngImage.ToArray());
await Navigation.PopAsync();
OnBallImageUpdated(_ballFilename);
}
}
private static List <SKImage> SplitImageBySeparators(SKImage image, IReadOnlyList <int> separators)
{
var subsets = new List <SKImage>();
for (var i = 0; i < separators.Count - 1; i++)
{
var left = separators[i];
var right = separators[i + 1];
var width = right - left;
var height = image.Height;
var crop = SKRectI.Create(width, height);
crop.Left = left;
crop.Right = right;
subsets.Add(image.Subset(crop));
}
return(subsets);
}
public static void sliceTiles(FileStream image, Tuple <double, double> topLeft, Tuple <double, double> bottomRight, string writePath)
{
const int tileLength = 256;
const int bottomLevel = 3;
int tilesPerDim = Convert.ToInt32(Math.Pow(2, Convert.ToDouble(bottomLevel)));
int pixelsPerDim = tilesPerDim * tileLength;
double degreesLatPerPixel = 180d / pixelsPerDim;
double degreesLonPerPixel = degreesLatPerPixel * 2;
Tuple <int, int> imageTopLeft = new Tuple <int, int>(Convert.ToInt32((90 - topLeft.Item1) / degreesLatPerPixel), Convert.ToInt32((180 + topLeft.Item2) / degreesLonPerPixel));
Tuple <int, int> imageBottomRight = new Tuple <int, int>(Convert.ToInt32((90 - bottomRight.Item1) / degreesLatPerPixel), Convert.ToInt32((180 + bottomRight.Item2) / degreesLonPerPixel));
SKImage sKImage = SKImage.FromEncodedData(image);
var fullSurface = SKSurface.Create(new SKImageInfo(pixelsPerDim, pixelsPerDim));
var canvas = fullSurface.Canvas;
SKBitmap scaledImage = new SKBitmap(imageBottomRight.Item2 - imageTopLeft.Item2, imageBottomRight.Item1 - imageTopLeft.Item1);
SKBitmap.FromImage(sKImage).ScalePixels(scaledImage, SKFilterQuality.High);
canvas.DrawBitmap(scaledImage, new SKPoint(imageTopLeft.Item2, imageTopLeft.Item1));
SKImage fullImage = fullSurface.Snapshot();
var tileSurface = SKSurface.Create(new SKImageInfo(tileLength, tileLength));
canvas = tileSurface.Canvas;
for (int y = 0; y < fullImage.Height; y += tileLength)
{
for (int x = 0; x < fullImage.Width; x += tileLength)
{
SKBitmap tile = SKBitmap.FromImage(fullImage.Subset(SKRectI.Create(x, y, tileLength, tileLength)));
canvas.Clear(SKColors.Transparent);
canvas.DrawBitmap(tile, SKRect.Create(0, 0, tileLength, tileLength));
var stream = File.OpenWrite($"{writePath}/aqlatestL{bottomLevel}T{(x / tileLength).ToString("D2")}{(y / tileLength).ToString("D2")}.png");
var data = tileSurface.Snapshot().Encode();
data.SaveTo(stream);
}
}
}
/// <summary>
/// Produces the array of <see cref="Chip"/>s from the specified image.
/// </summary>
/// <returns>An array of <see cref="Chip"/>s, each has size less than or equal to 300 x 300.</returns>
/// <param name="image">The image to use to create chips.</param>
public static IEnumerable <Chip> FromImage(SKImage image)
{
if (image == null)
{
throw new ArgumentNullException();
}
var width = image.Width;
var height = image.Height;
var chips = new List <Chip>();
var extraWidth = width % SharedConstants.DefaultChipWidth;
var extraHeight = height % SharedConstants.DefaultChipHeight;
var numWidth = width / SharedConstants.DefaultChipWidth + (extraWidth > 0 ? 1 : 0);
var numHeight = height / SharedConstants.DefaultChipHeight + (extraHeight > 0 ? 1 : 0);
for (var i = 0; i < numWidth; i++)
{
var x = i * SharedConstants.DefaultChipWidth;
var subWidth = i + 1 < numWidth || extraWidth == 0 ? SharedConstants.DefaultChipWidth : extraWidth;
for (var j = 0; j < numHeight; j++)
{
var y = j * SharedConstants.DefaultChipHeight;
var subHeight = j + 1 < numHeight || extraHeight == 0
? SharedConstants.DefaultChipHeight
: extraHeight;
var region = new SKRectI(x, y, x + subWidth, y + subHeight);
var subImage = image.Subset(region);
var pixels = GetPixelsFromImage(subImage);
chips.Add(new Chip(region, pixels));
}
}
return(chips.ToArray());
}
private SKImage PrepareBackground(SKBitmap background)
{
// calculate aspect ratio
float bgWidth = background.Width;
float bgHeight = background.Height;
float ratio = bgWidth / bgHeight;
if (ratio > 0)
{
// image is horizontal
// resize to fit background
int width = (int)(profileWidth * ratio);
int height = profileHeight;
background = background.Resize(new SKSizeI(width, height), SKFilterQuality.High);
}
else
{
// image is vertical
// resize to fit background
int width = profileWidth;
int height = (int)(profileHeight * ratio);
background = background.Resize(new SKSizeI(width, height), SKFilterQuality.High);
}
// crop image
// calculate subset rectangle
int subsetX = (background.Width - profileWidth) / 2;
int subsetY = (background.Height - profileHeight) / 2;
int subsetWidth = subsetX + profileWidth;
int subsetHeight = subsetY + profileHeight;
// convert bitmap to image
SKImage image = SKImage.FromBitmap(background);
// subset image from background
SKRectI subsetRect = new SKRectI(subsetX, subsetY, subsetWidth, subsetHeight);
return(image.Subset(subsetRect));
}
static void HandleImage(string Original, string Output)
{
SKBitmap Picture = SKBitmap.Decode(Original);
SKBitmap[] Digits = new SKBitmap[4];
SKBitmap[] CroppedDigits = new SKBitmap[4];
SKImage Image = SKImage.FromBitmap(Picture);
for (int i = 0; i < 4; i++)
{
Digits[i] = SKBitmap.FromImage(Image.Subset(new SKRectI(i * Picture.Width / 4, 0, (i + 1) * Picture.Width / 4, Picture.Height)));
CroppedDigits[i] = Crop(Digits[i]);
SKData data = SKImage.FromBitmap(CroppedDigits[i]).Encode(SKEncodedImageFormat.Jpeg, 100);
FileStream stream = new FileStream(Output + i.ToString() + ".jpg", FileMode.Create, FileAccess.Write);
data.SaveTo(stream);
stream.Close();
stream.Dispose();
data.Dispose();
Digits[i].Dispose();
CroppedDigits[i].Dispose();
}
Image.Dispose();
Picture.Dispose();
Console.Write("The work has been completed. Press any key to exit..");
Console.ReadKey(true);
SKBitmap Crop(SKBitmap bitmap)
{
int width = bitmap.Width, height = bitmap.Height;
int Left = 0, Top = 0, Right = 0, Bottom = 0;
// Left
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
if (bitmap.GetPixel(i, j) == SKColors.Black)
{
Left = i;
i = width;
break;
}
}
}
// Top
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
if (bitmap.GetPixel(j, i) == SKColors.Black)
{
Top = i;
i = height;
break;
}
}
}
// Right
for (int i = width; i > 0; i--)
{
for (int j = 0; j < height; j++)
{
if (bitmap.GetPixel(i, j) == SKColors.Black)
{
Right = i;
i = 0;
break;
}
}
}
// Bottom
for (int i = height; i > 0; i--)
{
for (int j = 0; j < width; j++)
{
if (bitmap.GetPixel(j, i) == SKColors.Black)
{
Bottom = i;
i = 0;
break;
}
}
}
return(SKBitmap.FromImage(SKImage.FromBitmap(bitmap).Subset(new SKRectI(Left, Top, Right, Bottom))));
}
}
