public void SamplePointsAndVectors()
{
var point1 = new SKPoint(50, 50);
var point2 = new SKPoint(110, 200);
var point3 = new SKPoint(80, 80);
var vector = point2 - point1;
var point4 = SKPoint.Add(point3, vector);
var p1 = new SKPath();
p1.MoveTo(point1);
p1.LineTo(point2);
var p2 = new SKPath();
p2.MoveTo(point3);
p2.LineTo(point4);
SkiaSharpHelper.DrawLines(new[] { p1, p2 });
}
/// <summary>
/// Applies the move and scale amount to the data point that make up the shape.
/// </summary>
private void ApplyMoveAndScale()
{
// Calculate origin offest
var originOffest = new SKSize(PreviousRect.Left - Rect.Left, PreviousRect.Top - Rect.Top);
// Get new center
var center = Center;
// Calculate offsets
var offest = new SKSize(Rect.Left - PreviousRect.Left, Rect.Top - PreviousRect.Top);
// Apply offest to all points
for (int n = 0; n < Points.Count; ++n)
{
Points[n].ControlPoint = SKPoint.Add(Points[n].ControlPoint, offest);
Points[n].EndPoint = SKPoint.Add(Points[n].EndPoint, offest);
}
// Calculate Size change
var offsetX = 0f;
var shrinkX = true;
var offsetY = 0f;
var shrinkY = true;
if (Rect.Width < PreviousRect.Width)
{
offsetX = Rect.Width / PreviousRect.Width;
shrinkX = true;
}
else
{
offsetX = PreviousRect.Width / Rect.Width;
shrinkX = false;
}
if (Rect.Height < PreviousRect.Height)
{
offsetY = Rect.Height / PreviousRect.Height;
shrinkY = true;
}
else
{
offsetY = PreviousRect.Height / Rect.Height;
shrinkY = false;
}
if (!((int)offsetX == 1 && (int)offsetY == 1))
{
// Apply offest to all points
for (int n = 0; n < Points.Count; ++n)
{
// Get adjusted x,y
var cx = Points[n].ControlPoint.X - PreviousCenter.X + originOffest.Width;
var cy = Points[n].ControlPoint.Y - PreviousCenter.Y + originOffest.Height;
var ex = Points[n].EndPoint.X - PreviousCenter.X + originOffest.Width;
var ey = Points[n].EndPoint.Y - PreviousCenter.Y + originOffest.Height;
// Calculate resized positions
if (shrinkX)
{
cx = (cx * offsetX) + center.X;
ex = (ex * offsetX) + center.X;
}
else
{
cx = (cx / offsetX) + center.X;
ex = (ex / offsetX) + center.X;
}
if (shrinkY)
{
cy = (cy * offsetY) + center.Y;
ey = (ey * offsetY) + center.Y;
}
else
{
cy = (cy / offsetY) + center.Y;
ey = (ey / offsetY) + center.Y;
}
// Apply new points
Points[n].ControlPoint = new SKPoint(cx, cy);
Points[n].EndPoint = new SKPoint(ex, ey);
}
}
}
public string DrawRegularPolygonSK(int vertexCount, float radius, SocketCommandContext context, [Optional] int rndNum)
{
string imagesPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "data", "images");
if (!Directory.Exists(imagesPath))
{
Directory.CreateDirectory(imagesPath);
}
using (SKBitmap bmp = new SKBitmap(1024, 1024))
using (SKPaint outerPaint = new SKPaint())
using (SKPaint innerPaint = new SKPaint())
using (SKPaint textPaint = new SKPaint())
using (SKCanvas canvas = new SKCanvas(bmp))
{
SKPoint center = new SKPoint(bmp.Width / 2, bmp.Height / 2);
var angle = Math.PI * 2 / vertexCount;
var points = Enumerable.Range(0, vertexCount).Select(i => SKPoint.Add(center, new SKSize((float)Math.Sin(i * angle) * radius,
(float)Math.Cos(i * angle) * radius)));
var color = GetGuildUserRoleColor(context.User as SocketGuildUser).Result;
canvas.Clear();
// this is for the filling of the polygon.
innerPaint.Color = new SKColor(color.R, color.G, color.B);
innerPaint.Style = SKPaintStyle.Fill;
innerPaint.StrokeWidth = 5f;
SKPath innerPath = new SKPath();
foreach (var point in points)
{
if (point == points.First())
{
innerPath.MoveTo(point);
}
else
{
innerPath.LineTo(point);
}
}
innerPath.Close();
canvas.DrawPath(innerPath, innerPaint);
// this is for the lines of the polygon.
outerPaint.Color = SKColors.Black;
outerPaint.StrokeWidth = 10f;
outerPaint.StrokeCap = SKStrokeCap.Round;
outerPaint.Style = SKPaintStyle.Stroke;
SKPath outerPath = new SKPath();
foreach (var point in points)
{
if (point == points.First())
{
outerPath.MoveTo(point);
}
else
{
outerPath.LineTo(point);
}
}
outerPath.Close();
canvas.DrawPath(outerPath, outerPaint);
// this is for the text.
textPaint.TextSize = 240f;
textPaint.IsAntialias = true;
if (color.R * 0.299f + color.G * 0.587f + color.B * 0.114f > 150) // decides the color of text based on bg color
{
textPaint.Color = SKColors.Black;
}
else
{
textPaint.Color = SKColors.White;
}
textPaint.Style = SKPaintStyle.StrokeAndFill;
textPaint.StrokeWidth = 15f;
textPaint.TextAlign = SKTextAlign.Center;
textPaint.GetFontMetrics(out var skFontMetrics);
canvas.DrawText(rndNum.ToString(), center.X, center.Y + skFontMetrics.CapHeight / 2, textPaint); // text's height is 188 pixels at size 240f and stroke 15f
using (var stream = File.Create(Path.Combine(imagesPath, context.Message.Id.ToString() + ".png")))
{
SKData data = SKImage.FromBitmap(bmp).Encode(SKEncodedImageFormat.Png, 100);
data.SaveTo(stream);
}
return(Path.Combine(imagesPath, context.Message.Id.ToString() + ".png").ToString());
}
}
