using SkiaSharp;
using SkiaSharp.Views.Desktop;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace SkiaWinForms
{
[DesignerCategory("Code")]
class DesktopForm : Form
{
readonly Bitmap _bitmap;
public DesktopForm(Bitmap bitmap)
{
_bitmap = bitmap;
Bounds = Screen.PrimaryScreen.Bounds;
FormBorderStyle = FormBorderStyle.None;
DoubleBuffered = true;
// Opacity = 0.50;
Click += (o, e) => Close();
KeyPress += (o, e) => Close();
Paint += (o, e) =>
{
e.Graphics.TranslateTransform(_bitmap.Width, bitmap.Height);
e.Graphics.ScaleTransform(-1, -1);
e.Graphics.DrawImage(_bitmap, Point.Empty);
};
}
}
[DesignerCategory("Code")]
class MainForm : Form
{
readonly Bitmap _screenshot;
readonly Ball _ball;
MainForm(Bitmap screenshot, Ball ball, int framesPerSecond)
{
_screenshot = screenshot;
_ball = ball;
Bounds = Screen.PrimaryScreen.Bounds;
FormBorderStyle = FormBorderStyle.None;
DoubleBuffered = true;
var skcontrol = new SKGLControl() { Dock = DockStyle.Fill };
skcontrol.PaintSurface += Skcontrol_PaintSurface;
skcontrol.Click += (o, e) => Close();
skcontrol.KeyPress += (o, e) => Close();
var timer = new Timer() { Interval = (int)Math.Round(1000.0 / framesPerSecond) };
timer.Tick += (o, e) => { _ball.Update(); skcontrol.Invalidate(); };
timer.Start();
Controls.Add(skcontrol);
}
private void Skcontrol_PaintSurface(object sender, SKPaintGLSurfaceEventArgs e)
{
var surface = e.Surface;
var canvas = surface.Canvas;
canvas.Clear(SKColors.White);
canvas.DrawCircle(_ball.Position, _ball.Radius, new SKPaint()
{
IsAntialias = true,
Color = SKColors.Green,
Style = SKPaintStyle.Fill
});
canvas.DrawText($"{DateTime.Now}", 100, 100, new SKPaint()
{
TextSize = 64.0f,
IsAntialias = true,
Color = SKColors.Red,
Style = SKPaintStyle.Fill
});
canvas.Flush();
}
protected override bool ProcessDialogKey(Keys keyData)
{
if (keyData.HasFlag(Keys.Escape))
{
using (var desktop = new DesktopForm(_screenshot))
desktop.ShowDialog();
return true;
}
return base.ProcessDialogKey(keyData);
}
static Bitmap CreateScreenshot()
{
var rect = Screen.PrimaryScreen.Bounds;
var bitmap = new Bitmap(rect.Width, rect.Height, PixelFormat.Format32bppArgb);
using (var g = Graphics.FromImage(bitmap))
{
g.CopyFromScreen(rect.Location, Point.Empty, rect.Size);
}
return bitmap;
}
[STAThread]
static void Main()
{
const int FramesPerSecond = 24;
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new MainForm(CreateScreenshot(),
new Ball(Screen.PrimaryScreen.Bounds, FramesPerSecond),
FramesPerSecond));
}
}
class Ball
{
readonly Rectangle _bounds;
SKPoint _vector;
SKPoint _position;
public SKPoint Position => _position;
public float Radius => 200.0f;
public Ball(Rectangle bounds, int framesPerSecond)
{
_bounds = bounds;
_position.X = _bounds.Width / 2;
_position.Y = _bounds.Height / 2;
const int PixelsPerSecond = 150;
var pixelsPerFrame = (float) PixelsPerSecond / framesPerSecond;
_vector = new SKPoint(pixelsPerFrame, pixelsPerFrame);
}
public void Update()
{
(_position.X, _vector.X) = CheckBounds(_position.X, _vector.X, _bounds.Left, _bounds.Right);
(_position.Y, _vector.Y) = CheckBounds(_position.Y, _vector.Y, _bounds.Top, _bounds.Bottom);
(float newValue, float newVector) CheckBounds(float value, float vector, float min, float max)
{
value += vector;
if (value + Radius > max)
{
value = max - Radius;
vector *= -1;
}
else if (value - Radius < min)
{
value = min + Radius;
vector *= -1;
}
return (value, vector);
}
}
}
}
Problem is combination Forms nad hard image size. Can it be easy to the fast draw cover image for avoiding background flickering? (Some screen drawing probably with some Windows lib or Nuget package.) I want result with no external requirements, just small lib if must it be. Also remember, that I want transitions in/out this cover image for really smooth loading...
