/// <summary>
/// Main place for drawing current fractal.
/// Called when the first drawing is taking place, as well as all the next redraw.
/// </summary>
/// <param name="sender">Sender object - the picturebox on which the drawing will take place.</param>
/// <param name="e">Some arguments.</param>
private void DrawingPictureBox_Paint(object sender, PaintEventArgs e)
{
// Getting current drawing PictureBox object
PictureBox drawingPictureBoxDesk = (PictureBox)sender;
// Update current width and height of drawing panel.
PictureBoxWidth = drawingPictureBoxDesk.Width;
PictureBoxHeight = drawingPictureBoxDesk.Height;
// Update current bitmap.
bitmap = new Bitmap(PictureBoxWidth, PictureBoxHeight);
// Update graphics with new bitmap.
DrawingPanel = Graphics.FromImage(bitmap);
DrawingPanel.FillRectangle(new SolidBrush(Color.FromArgb(220, 220, 220)), new RectangleF(0, 0, PictureBoxWidth, PictureBoxHeight));
DrawingPanel.InterpolationMode = InterpolationMode.HighQualityBicubic;
DrawingPanel.ScaleTransform(Zoom, Zoom);
if (DrawingPanel == null)
{
return;
}
try
{
fractal.Draw();
}
catch (NullReferenceException)
{
// It occurs when the user starts changing colors or changing the size of form and fractal need to redraw,
// but there is no one current fractal, because user hasn't yet selected it from a list.
// In this case, this behavior is considered correct, so nothing happens.
}
catch (TimeoutException)
{
// After throwing timeout error from fractal's drawing method.
ClearAfterTimeoutExceeded();
}
catch { }
e.Graphics.Clear(this.BackColor);
e.Graphics.DrawImage(bitmap, 0, 0);
base.OnPaint(e);
}
/// <summary>
/// OnPaint event for the left panel (a.k.a. canvas).
/// </summary>
private void FractalPaint(object sender, PaintEventArgs e)
{
if (_fractalCombobox.SelectedItem == null)
{
return;
}
var render = new Render(_scaleTextslider.Value, _cameraXOffsetTextslider.Value, _cameraYOffsetTextslider.Value, _canvasPanel.Size);
Fractal fractal = _fractalCombobox.SelectedIndex switch
{
0 => new PythagoreanTree((int)_recursionTextslider.Value, _gradientColorA, _gradientColorB, render,
_ptFirstLineLengthTextslider.Value, _ptLengthRatioTextslider.Value, _ptAngle1Textslider.Value, _ptAngle2Textslider.Value),
1 => new KochCurve((int)_recursionTextslider.Value, _gradientColorA, _gradientColorB, render),
2 => new SierpinskiCarpet((int)_recursionTextslider.Value, _gradientColorA, _gradientColorB, render),
3 => new SierpinskiTriangle((int)_recursionTextslider.Value, _gradientColorA, _gradientColorB, render),
4 => new CantorSet((int)_recursionTextslider.Value, _gradientColorA, _gradientColorB, render,
_csVerticalDistanceTextslider.Value, _csHorizontalDistanceTextslider.Value, _csWidthTextslider.Value),
_ => throw new NotImplementedException()
};
fractal.Draw(e.Graphics);
}