| public Draw ( Android.Graphics.Canvas canvas ) : void | ||
| canvas | Android.Graphics.Canvas | |
| return | void | |
private void DrawAlphaPanel(Canvas canvas)
{
if (!_showAlphaPanel || _alphaRect == null || _alphaPattern == null)
{
return;
}
var rect = _alphaRect;
if (BorderWidthPx > 0)
{
_borderPaint.Color = _borderColor;
canvas.DrawRect(rect.Left - BorderWidthPx,
rect.Top - BorderWidthPx,
rect.Right + BorderWidthPx,
rect.Bottom + BorderWidthPx,
_borderPaint);
}
_alphaPattern.Draw(canvas);
var color = ColorUtils.ColorFromHSV(_hue / 360f, _sat, _val);
var acolor = ColorUtils.ColorFromHSV(_hue / 360f, _sat, _val, 0);
using (_alphaShader = new LinearGradient(rect.Left, rect.Top, rect.Right, rect.Top,
color, acolor, Shader.TileMode.Clamp))
{
_alphaPaint.SetShader(_alphaShader);
canvas.DrawRect(rect, _alphaPaint);
}
if (!string.IsNullOrEmpty(_alphaSliderText))
{
canvas.DrawText(_alphaSliderText, rect.CenterX(), rect.CenterY() + 4 * _density, _alphaTextPaint);
}
float rectWidth = 4 * _density / 2;
var p = AlphaToPoint(_alpha);
var r = new RectF
{
Left = p.X - rectWidth,
Right = p.X + rectWidth,
Top = rect.Top - _rectangleTrackerOffset,
Bottom = rect.Bottom + _rectangleTrackerOffset
};
canvas.DrawRoundRect(r, 2, 2, _hueTrackerPaint);
}
protected override void OnDraw(Canvas canvas)
{
var rect = _colorRect;
if (BorderWidthPx > 0)
{
_borderPaint.Color = _borderColor;
canvas.DrawRect(_drawingRect, _borderPaint);
}
if (_alphaPattern != null)
{
_alphaPattern.Draw(canvas);
}
_colorPaint.Color = _color;
canvas.DrawRect(rect, _colorPaint);
}