| public static ColorFromHSV ( HSV hsv, int alpha = 255 ) : Color | ||
| hsv | HSV | |
| alpha | int | |
| return | Color | |
private void DrawSatValPanel(Canvas canvas)
{
var rect = _satValRect;
if (BorderWidthPx > 0)
{
_borderPaint.Color = _borderColor;
canvas.DrawRect(_drawingRect.Left, _drawingRect.Top, rect.Right + BorderWidthPx, rect.Bottom + BorderWidthPx, _borderPaint);
}
if (_valShader == null)
{
_valShader = new LinearGradient(rect.Left, rect.Top, rect.Left, rect.Bottom,
Color.Argb(255, 255, 255, 255), Color.Argb(255, 0, 0, 0), Shader.TileMode.Clamp);
}
var rgb = ColorUtils.ColorFromHSV(_hue / 360f, 1f, 1f);
using (_satShader = new LinearGradient(rect.Left, rect.Top, rect.Right, rect.Top,
Color.Argb(255, 255, 255, 255), rgb, Shader.TileMode.Clamp))
{
var mShader = new ComposeShader(_valShader, _satShader, PorterDuff.Mode.Multiply);
_satValPaint.SetShader(mShader);
canvas.DrawRect(rect, _satValPaint);
}
var p = SatValToPoint(_sat, _val);
_satValTrackerPaint.Color = Color.Argb(255, 0, 0, 0);
canvas.DrawCircle(p.X, p.Y, _paletteCircleTrackerRadius - 1f * _density, _satValTrackerPaint);
_satValTrackerPaint.Color = Color.Argb(255, 221, 221, 221);
canvas.DrawCircle(p.X, p.Y, _paletteCircleTrackerRadius, _satValTrackerPaint);
}
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);
}
private static int[] BuildHueColorArray()
{
var hue = new int[361];
var count = 0;
for (var i = hue.Length - 1; i >= 0; i--, count++)
{
hue[count] = ColorUtils.ColorFromHSV(i / 360f, 1f, 1f);
}
return(hue);
}
private void DrawSatValPanel(Canvas canvas)
{
#if __ANDROID_11__
if (Android.OS.Build.VERSION.SdkInt > Android.OS.BuildVersionCodes.Honeycomb)
{
RootView.SetLayerType(LayerType.Software, null);
}
#endif
var rect = _satValRect;
if (BorderWidthPx > 0)
{
_borderPaint.Color = _borderColor;
canvas.DrawRect(_drawingRect.Left, _drawingRect.Top, rect.Right + BorderWidthPx, rect.Bottom + BorderWidthPx, _borderPaint);
}
if (_valShader == null)
{
_valShader = new LinearGradient(rect.Left, rect.Top, rect.Left, rect.Bottom,
Color.Argb(255, 255, 255, 255), Color.Argb(255, 0, 0, 0), Shader.TileMode.Clamp);
}
var rgb = ColorUtils.ColorFromHSV(_hue / 360f, 1f, 1f);
using (_satShader = new LinearGradient(rect.Left, rect.Top, rect.Right, rect.Top,
Color.Argb(255, 255, 255, 255), rgb, Shader.TileMode.Clamp))
{
var mShader = new ComposeShader(_valShader, _satShader, PorterDuff.Mode.Multiply);
_satValPaint.SetShader(mShader);
canvas.DrawRect(rect, _satValPaint);
}
var p = SatValToPoint(_sat, _val);
_satValTrackerPaint.Color = Color.Argb(255, 0, 0, 0);
canvas.DrawCircle(p.X, p.Y, _paletteCircleTrackerRadius - 1f * _density, _satValTrackerPaint);
_satValTrackerPaint.Color = Color.Argb(255, 221, 221, 221);
canvas.DrawCircle(p.X, p.Y, _paletteCircleTrackerRadius, _satValTrackerPaint);
}
public override bool OnTouchEvent(MotionEvent e)
{
var update = false;
switch (e.Action)
{
case MotionEventActions.Down:
_startTouchPoint = new Point((int)e.GetX(), (int)e.GetY());
update = MoveTrackersIfNeeded(e);
break;
case MotionEventActions.Move:
update = MoveTrackersIfNeeded(e);
break;
case MotionEventActions.Up:
_startTouchPoint = null;
update = MoveTrackersIfNeeded(e);
GC.Collect(); //Not sure if collecting too much here...
break;
}
if (update)
{
if (ColorChanged != null)
{
ColorChanged(this, new ColorChangedEventArgs {
Color = ColorUtils.ColorFromHSV(_hue / 360, _sat, _val, _alpha)
});
}
Invalidate();
return(true);
}
return(base.OnTouchEvent(e));
}
public override bool OnTrackballEvent(MotionEvent e)
{
var x = e.GetX();
var y = e.GetY();
var update = false;
if (e.Action == MotionEventActions.Move)
{
switch (_lastTouchedPanel)
{
case PanelSatVal:
var sat = _sat + x / 50f;
var val = _val - y / 50f;
if (sat < 0f)
{
sat = 0f;
}
else if (sat > 1f)
{
sat = 1f;
}
if (val < 0f)
{
val = 0f;
}
else if (val > 1f)
{
val = 1f;
}
_sat = sat;
_val = val;
update = true;
break;
case PanelHue:
var hue = _hue - y * 10f;
if (hue < 0f)
{
hue = 0f;
}
else if (hue > 360f)
{
hue = 360f;
}
_hue = hue;
update = true;
break;
case PanelAlpha:
if (!_showAlphaPanel || _alphaRect == null)
{
update = false;
}
else
{
var alpha = (int)(_alpha - x * 10);
if (alpha < 0)
{
alpha = 0;
}
else if (alpha > 0xff)
{
alpha = 0xff;
}
_alpha = alpha;
update = true;
}
break;
}
}
if (update)
{
if (ColorChanged != null)
{
ColorChanged(this, new ColorChangedEventArgs {
Color = ColorUtils.ColorFromHSV(_hue / 360, _sat, _val, _alpha)
});
}
Invalidate();
return(true);
}
return(base.OnTrackballEvent(e));
}
