protected override void OnSizeChanged(int w, int h, int oldw, int oldh)
{
base.OnSizeChanged(w, h, oldw, oldh);
_length = w > h ? h : w;
var thickness = _length / 20;
_rectBackground = new RectF(thickness / 2, thickness / 2, _length - thickness / 2, _length - thickness / 2);
if (_separateProgressFromItsBackground)
{
_rectForeground = new RectF(thickness * 3 / 2, thickness * 3 / 2, _length - thickness * 3 / 2,
_length - thickness * 3 / 2);
}
else
{
_rectForeground = _rectBackground;
}
_percentagePaint.TextSize = _length / 6;
_textPaint.TextSize = _length / 8;
_backgroundWidth = thickness;
_progressWidth = thickness;
_arcPaintBackground.StrokeWidth = _backgroundWidth;
_arcPaintProgress.StrokeWidth = _progressWidth;
var gradientRadius = _length / 2;
var sweepOffsetIndex = GetSweep() / 360.0f;
var sweepGradient = new SweepGradient(gradientRadius, gradientRadius,
new int[] { Color.Red, Color.Yellow, Color.Yellow, Color.Green },
new[] { 0.0f, 0.375f * sweepOffsetIndex, 0.625f * sweepOffsetIndex, sweepOffsetIndex });
if (_startAngle != 0)
{
var matrix = new Matrix();
matrix.SetRotate(_startAngle - 0.5f, gradientRadius,
gradientRadius); // There is some issues with floating calculations, which affects gradient draw. Thus - 0.5f to hide it.
sweepGradient.SetLocalMatrix(matrix);
}
_arcPaintProgress.SetShader(sweepGradient);
if (ArrowDrawable != null)
{
_arrowBitmap = Bitmap.CreateBitmap(_length, _length, Bitmap.Config.Argb8888);
_arrowCanvas = new Canvas(_arrowBitmap);
var arrowSize = thickness * 3;
var arrowLeftPos = _length - thickness - arrowSize;
var arrowTopPos = _length / 2 - arrowSize / 2;
if (_separateProgressFromItsBackground)
{
arrowLeftPos -= thickness;
}
var arrowRightPos = arrowLeftPos + arrowSize;
var arrowBottomPos = arrowTopPos + arrowSize;
ArrowDrawable.SetBounds(arrowLeftPos, arrowTopPos, arrowRightPos, arrowBottomPos);
ArrowDrawable.Draw(_arrowCanvas);
}
}
private void DrawRing(Canvas c)
{
var sc = c.Save();
c.Rotate(-this.Degree, c.Width / 2, c.Height / 2);
//中心点
var cx = c.Width / 2;
var cy = c.Height / 2;
//用两个圆 Path 构造一个 圆环显示区域, 即挖空内圆
var pInner = new Path();
pInner.AddCircle(cx, cy, this.BitmapRadius + SPACE / 2, Path.Direction.Cw);
var pOut = new Path();
pOut.AddCircle(cx, cy, this.Radius, Path.Direction.Cw);
c.ClipPath(pOut);
c.ClipPath(pInner, Region.Op.Difference);
//var color = new Color((int)(DateTime.Now.Ticks % 0xFFFFFFFF));
//c.DrawColor(color);
//用角度渐变填充外圆的范围
var g = new SweepGradient(cx, cy, Color.Green, Color.Transparent);
var paint = new Paint();
paint.SetShader(g);
c.DrawCircle(cx, cy, this.Radius, paint);
c.RestoreToCount(sc);
}
private Bitmap createColorWheelBitmap(int width, int height)
{
Bitmap bitmap = Bitmap.CreateBitmap(width, height, Bitmap.Config.Argb8888);
int colorCount = 12;
int colorAngleStep = 360 / 12;
int[] colors = new int[colorCount + 1];
float[] hsv = new float[] { 0f, 1f, 1f };
for (int i = 0; i < colors.Length; i++)
{
hsv[0] = (i * colorAngleStep + 180) % 360;
colors[i] = Color.HSVToColor(hsv);
}
colors[colorCount] = colors[0];
SweepGradient sweepGradient = new SweepGradient(width / 2, height / 2, colors, null);
RadialGradient radialGradient = new RadialGradient(width / 2, height / 2, colorWheelRadius, new Color(0xFFFFFF), new Color(0x00FFFFFF), Shader.TileMode.Clamp);
ComposeShader composeShader = new ComposeShader(sweepGradient, radialGradient, PorterDuff.Mode.SrcOver);
colorWheelPaint.SetShader(composeShader);
Canvas canvas = new Canvas(bitmap);
canvas.DrawCircle(width / 2, height / 2, colorWheelRadius, colorWheelPaint);
return(bitmap);
}
public void DrawPieChart(float average, float sum, Color start, Color end, float width = 0.13f,
float radius = -1, bool text = true)
{
float Cx = _width / 2f,
Cy = _height / 2f,
strokeWidth = width * (_width <= _height ? _width : _height);
radius = radius <= 0 ? (_width <= _height ? _width / 2f : _height / 2f) - strokeWidth : radius;
Shader shader = new SweepGradient(Cx, Cy, end, start);
var paintMain = new Paint {
Color = start, StrokeWidth = strokeWidth, AntiAlias = true
};
var paintBack = new Paint {
Color = Color.Rgb(29, 43, 59), StrokeWidth = strokeWidth, AntiAlias = true
};
paintMain.SetStyle(Paint.Style.Stroke);
paintMain.SetShader(shader);
paintBack.SetStyle(Paint.Style.Stroke);
Canvas.DrawArc(new RectF(Cx - radius, Cy - radius, Cx + radius, Cy + radius), 0f, 360f, false, paintBack);
Canvas.Rotate(-90f, Cx, Cy);
Canvas.DrawArc(new RectF(Cx - radius, Cy - radius, Cx + radius, Cy + radius), 0.5f,
360f - average * (360f / sum), false, paintMain);
Canvas.Rotate(90f, Cx, Cy);
if (text)
{
DrawText(_width * 20f / 100f, $"{RoundOfNumber(100 - average * 100f / sum)}%", 2.4f * _width / 10f,
Cy - 33f * radius / 100);
}
}
//@SuppressLint("DrawAllocation")
//@Override
protected override void OnDraw(Canvas canvas)
{
int centerX = Width / 2;
int centerY = Height / 2;
// drawing color wheel
canvas.DrawBitmap(colorWheelBitmap, centerX - colorWheelRadius, centerY - colorWheelRadius, null);
// drawing color view
colorViewPaint.Color = Color.HSVToColor(colorHSV);
canvas.DrawPath(colorViewPath, colorViewPaint);
// drawing value slider
float[] hsv = new float[] { colorHSV[0], colorHSV[1], 1f };
SweepGradient sweepGradient = new SweepGradient(centerX, centerY, new int[] { Color.Black, Color.HSVToColor(hsv), Color.White }, null);
sweepGradient.SetLocalMatrix(gradientRotationMatrix);
valueSliderPaint.SetShader(sweepGradient);
canvas.DrawPath(valueSliderPath, valueSliderPaint);
// drawing color wheel pointer
float hueAngle = (float)Math.ToRadians(colorHSV[0]);
int colorPointX = (int)(-Math.Cos(hueAngle) * colorHSV[1] * colorWheelRadius) + centerX;
int colorPointY = (int)(-Math.Sin(hueAngle) * colorHSV[1] * colorWheelRadius) + centerY;
float pointerRadius = 0.075f * colorWheelRadius;
int pointerX = (int)(colorPointX - pointerRadius / 2);
int pointerY = (int)(colorPointY - pointerRadius / 2);
colorPointerCoords.Set(pointerX, pointerY, pointerX + pointerRadius, pointerY + pointerRadius);
canvas.DrawOval(colorPointerCoords, colorPointerPaint);
// drawing value pointer
valuePointerPaint.Color = Color.HSVToColor(new float[] { 0f, 0f, 1f - colorHSV[2] });
double valueAngle = (colorHSV[2] - 0.5f) * Math.Pi;
float valueAngleX = (float)Math.Cos(valueAngle);
float valueAngleY = (float)Math.Sin(valueAngle);
canvas.DrawLine(valueAngleX * innerWheelRadius + centerX, valueAngleY * innerWheelRadius + centerY, valueAngleX * outerWheelRadius + centerX,
valueAngleY * outerWheelRadius + centerY, valuePointerPaint);
// drawing pointer arrow
if (arrowPointerSize > 0)
{
drawPointerArrow(canvas);
}
}
internal ColorPickerView(ColorPickerDialog outerInstance, Context c, OnColorChangedListener l, int color) : base(c)
{
this.outerInstance = outerInstance;
mListener = l;
mColors = new int[] { unchecked ((int)0xFFFF0000), unchecked ((int)0xFFFF00FF), unchecked ((int)0xFF0000FF), unchecked ((int)0xFF00FFFF), unchecked ((int)0xFF00FF00), unchecked ((int)0xFFFFFF00), unchecked ((int)0xFFFF0000) };
Shader s = new SweepGradient(0, 0, mColors, null);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.Shader = s;
mPaint.Style = Paint.Style.STROKE;
mPaint.StrokeWidth = 32;
mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCenterPaint.Color = color;
mCenterPaint.StrokeWidth = 5;
}
public ColorPickerView(Context c, Color color)
: base(c)
{
_colors = new[] {
new Color(255, 0, 0, 255).ToArgb(), new Color(255, 0, 255, 255).ToArgb(), new Color(0, 0, 255, 255).ToArgb(),
new Color(0, 255, 255, 255).ToArgb(), new Color(0, 255, 0, 255).ToArgb(), new Color(255, 255, 0, 255).ToArgb(),
new Color(255, 0, 0, 255).ToArgb()
};
Shader s = new SweepGradient(0, 0, _colors, null);
_paint = new Paint(PaintFlags.AntiAlias);
_paint.SetShader(s);
_paint.SetStyle(Paint.Style.Stroke);
_paint.StrokeWidth = 32;
_centerPaint = new Paint(PaintFlags.AntiAlias)
{
Color = color,
StrokeWidth = 5
};
}
public ColorPickerView(Context c, OnColorChangedListener l, int color) : base(c)
{
mListener = l;
mColors = new int[] {
Color.White.ToArgb(),
Color.Black.ToArgb(),
Color.Red.ToArgb(),
Color.Yellow.ToArgb(),
Color.Pink.ToArgb(),
Color.Green.ToArgb(),
Color.Purple.ToArgb(),
Color.Blue.ToArgb()
};
Shader s = new SweepGradient(0, 0, mColors, null);
mPaint = new Paint(PaintFlags.AntiAlias);
mPaint.SetShader(s);
mPaint.SetStyle(Paint.Style.Stroke);
mPaint.StrokeWidth = 32;
mCenterPaint = new Paint(PaintFlags.AntiAlias);
mCenterPaint.Color = new Color(color);
mCenterPaint.StrokeWidth = 5;
}
private void init(IAttributeSet attrs, int defStyle)
{
TypedArray a = Context.ObtainStyledAttributes(attrs,
Resource.Styleable.ColorPicker, defStyle, 0);
Resources b = Context.Resources;
mColorWheelThickness = a.GetDimensionPixelSize(
Resource.Styleable.ColorPicker_color_wheel_thickness,
b.GetDimensionPixelSize(Resource.Dimension.color_wheel_thickness));
mColorWheelRadius = a.GetDimensionPixelSize(
Resource.Styleable.ColorPicker_color_wheel_radius,
b.GetDimensionPixelSize(Resource.Dimension.color_wheel_radius));
mPreferredColorWheelRadius = mColorWheelRadius;
mColorCenterRadius = a.GetDimensionPixelSize(
Resource.Styleable.ColorPicker_color_center_radius,
b.GetDimensionPixelSize(Resource.Dimension.color_center_radius));
mPreferredColorCenterRadius = mColorCenterRadius;
mColorCenterHaloRadius = a.GetDimensionPixelSize(
Resource.Styleable.ColorPicker_color_center_halo_radius,
b.GetDimensionPixelSize(Resource.Dimension.color_center_halo_radius));
mPreferredColorCenterHaloRadius = mColorCenterHaloRadius;
mColorPointerRadius = a.GetDimensionPixelSize(
Resource.Styleable.ColorPicker_color_pointer_radius,
b.GetDimensionPixelSize(Resource.Dimension.color_pointer_radius));
mColorPointerHaloRadius = a.GetDimensionPixelSize(
Resource.Styleable.ColorPicker_color_pointer_halo_radius,
b.GetDimensionPixelSize(Resource.Dimension.color_pointer_halo_radius));
mShowCenterOldColor = a.GetBoolean(Resource.Styleable.ColorPicker_color_center_show_old_color, false);
a.Recycle();
mAngle = (float)(-Math.PI / 2);
Shader s = new SweepGradient(0, 0, COLORS, null);
mColorWheelPaint = new Paint(PaintFlags.AntiAlias);
mColorWheelPaint.SetShader(s);
mColorWheelPaint.SetStyle(Paint.Style.Stroke);
mColorWheelPaint.StrokeWidth = (mColorWheelThickness);
mPointerHaloPaint = new Paint(PaintFlags.AntiAlias);
mPointerHaloPaint.Color = (Color.Black);
mPointerHaloPaint.Alpha = (0x50);
mPointerColor = new Paint(PaintFlags.AntiAlias);
mPointerColor.Color = new Color(calculateColor(mAngle));
mCenterNewPaint = new Paint(PaintFlags.AntiAlias);
mCenterNewPaint.Color = new Color(calculateColor(mAngle));
mCenterNewPaint.SetStyle(Paint.Style.Fill);
mCenterOldPaint = new Paint(PaintFlags.AntiAlias);
mCenterOldPaint.Color = new Color(calculateColor(mAngle));
mCenterOldPaint.SetStyle(Paint.Style.Fill);
mCenterHaloPaint = new Paint(PaintFlags.AntiAlias);
mCenterHaloPaint.Color = (Color.Black);
mCenterHaloPaint.Alpha = (0x00);
mCenterNewColor = calculateColor(mAngle);
mCenterOldColor = calculateColor(mAngle);
}
internal ColorPickerView(ColorPickerDialog outerInstance, Context c, OnColorChangedListener l, int color) : base(c)
{
this.outerInstance = outerInstance;
mListener = l;
mColors = new int[]{unchecked((int)0xFFFF0000), unchecked((int)0xFFFF00FF), unchecked((int)0xFF0000FF), unchecked((int)0xFF00FFFF), unchecked((int)0xFF00FF00), unchecked((int)0xFFFFFF00), unchecked((int)0xFFFF0000)};
Shader s = new SweepGradient(0, 0, mColors, null);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.Shader = s;
mPaint.Style = Paint.Style.STROKE;
mPaint.StrokeWidth = 32;
mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCenterPaint.Color = color;
mCenterPaint.StrokeWidth = 5;
}