private void PaintSlider(SKCanvas canvas, SliderLocation slider, SKSize canvasSize)
{
var pickerRadiusPixels = GetPickerRadiusPixels();
var sliderTop = slider.GetSliderOffset(pickerRadiusPixels);
SKPoint startPoint;
SKPoint endPoint;
if (Vertical)
{
startPoint = new SKPoint(sliderTop, pickerRadiusPixels * 2);
endPoint = new SKPoint(sliderTop, canvasSize.Height - (pickerRadiusPixels * 2));
}
else
{
startPoint = new SKPoint(pickerRadiusPixels * 2, sliderTop);
endPoint = new SKPoint(canvasSize.Width - (pickerRadiusPixels * 2), sliderTop);
}
var paint = slider.Slider.GetPaint(SelectedColor, startPoint, endPoint);
paint.StrokeWidth = pickerRadiusPixels * 1.3F;
if (slider.Slider.PaintChessPattern)
{
PaintChessPattern(canvas, slider, canvasSize);
}
canvas.DrawLine(startPoint, endPoint, paint);
}
private void PaintChessPattern(SKCanvas canvas, SliderLocation slider, SKSize canvasSize)
{
var pickerRadiusPixels = GetPickerRadiusPixels();
var sliderTop = slider.GetSliderOffset(pickerRadiusPixels);
var scale = pickerRadiusPixels / 3;
SKPath path = new SKPath();
path.MoveTo(-1 * scale, -1 * scale);
path.LineTo(0 * scale, -1 * scale);
path.LineTo(0 * scale, 0 * scale);
path.LineTo(1 * scale, 0 * scale);
path.LineTo(1 * scale, 1 * scale);
path.LineTo(0 * scale, 1 * scale);
path.LineTo(0 * scale, 0 * scale);
path.LineTo(-1 * scale, 0 * scale);
path.LineTo(-1 * scale, -1 * scale);
SKMatrix matrix = SKMatrix.MakeScale(2 * scale, 2 * scale);
SKPaint paint = new SKPaint
{
PathEffect = SKPathEffect.Create2DPath(matrix, path),
Color = Color.LightGray.ToSKColor(),
IsAntialias = true
};
SKRect patternRect;
SKRect clipRect;
SKRoundRect clipRoundRect;
if (Vertical)
{
patternRect = new SKRect(sliderTop - pickerRadiusPixels, pickerRadiusPixels
, sliderTop + pickerRadiusPixels, canvasSize.Height - pickerRadiusPixels);
clipRect = new SKRect(sliderTop - (pickerRadiusPixels * 0.65f), pickerRadiusPixels * 1.35f
, sliderTop + (pickerRadiusPixels * 0.65f), canvasSize.Height - (pickerRadiusPixels * 1.35f));
clipRoundRect = new SKRoundRect(clipRect, pickerRadiusPixels * 0.65f, pickerRadiusPixels * 0.65f);
}
else
{
patternRect = new SKRect(pickerRadiusPixels, sliderTop - pickerRadiusPixels
, canvasSize.Width - pickerRadiusPixels, sliderTop + pickerRadiusPixels);
clipRect = new SKRect(pickerRadiusPixels * 1.35f, sliderTop - (pickerRadiusPixels * 0.65f)
, canvasSize.Width - (pickerRadiusPixels * 1.35f), sliderTop + (pickerRadiusPixels * 0.65f));
clipRoundRect = new SKRoundRect(clipRect, pickerRadiusPixels * 0.65f, pickerRadiusPixels * 0.65f);
}
canvas.Save();
canvas.ClipRoundRect(clipRoundRect);
canvas.DrawRect(patternRect, paint);
canvas.Restore();
}
protected void UpdateSliders()
{
sliders.Clear();
var i = 1;
foreach (var slider in GetSliders())
{
var sliderLocation = new SliderLocation(slider)
{
OffsetLocationMultiplier = (float)(-1.1 + (i * 2.2))
};
sliders.Add(sliderLocation);
i++;
}
InvalidateSurface();
}
private void UpdateColors(SliderLocation slider, SKSize canvasSize)
{
var newColor = SelectedColor;
float newValue;
if (Vertical)
{
newValue = (slider.Location.Y - (GetPickerRadiusPixels() * 2)) / SlidersWidht(canvasSize);
}
else
{
newValue = (slider.Location.X - (GetPickerRadiusPixels() * 2)) / SlidersWidht(canvasSize);
}
newColor = slider.Slider.GetNewColor(newValue, newColor);
SelectedColor = newColor;
InvalidateSurface();
}
