public static void Draw(Canvas canvas, IViewport viewport, IStyle style, IFeature feature)
{
var lineString = ((LineString) feature.Geometry).Vertices;
var paints = style.ToAndroid();
//using (var paint = new Paint {Color = Color.Black, StrokeWidth = 8, AntiAlias = true})
foreach (var paint in paints)
{
var vertices = lineString;
var points = vertices.ToAndroid();
WorldToScreen(viewport, points);
canvas.DrawLines(points, paint);
paint.Dispose();
}
}
protected override void OnDraw(Android.Graphics.Canvas canvas)
{
base.OnDraw(canvas);
var half = canvas.Height / 2;
var left = 0;
var right = canvas.Width - 2;
var top = 0;
var bottom = canvas.Height - 1;
var offsetPlier = 1;
float[] points = null;
switch (orientation)
{
case ArrowOrientation.Left:
points = new float[] {
right, top,
left, half,
left, half,
right, bottom
};
offsetPlier = 1;
break;
case ArrowOrientation.Right:
points = new float[] {
left, top,
right, half,
right, half,
left, bottom
};
offsetPlier = -1;
break;
}
for (int dx = 0; dx < 5; dx++)
{
canvas.DrawLines(Offset(points, offsetPlier * dx, 0), arrowPaint);
}
}
public override void Draw(Canvas canvas)
{
//Console.WriteLine("EqualizerPresetGraphView - Draw - Width: {0} Height: {1}", Width, Height);
float padding = 6 * Resources.DisplayMetrics.Density;
float heightAvailable = Height - (padding*2);
var paintRect = new Paint {
AntiAlias = true,
Color = Color.ParseColor("#222222")
};
paintRect.SetStyle(Paint.Style.Fill);
canvas.DrawRect(new Rect(0, 0, Width, Height), paintRect);
if (_preset == null)
return;
// Draw center line
var paintCenterLine = new Paint {
AntiAlias = true,
Color = Color.DarkGray
};
paintCenterLine.SetStyle(Paint.Style.Fill);
paintCenterLine.StrokeWidth = 2f;
canvas.DrawLine(padding, Height / 2, Width - padding, Height / 2, paintCenterLine);
// Draw 20Hz and 20kHz lines
paintCenterLine.StrokeWidth = 1f;
canvas.DrawLine(padding, padding, padding, Height - padding, paintCenterLine);
canvas.DrawLine(Width - padding, padding, Width - padding, Height - padding, paintCenterLine);
var paintText = new Paint {
AntiAlias = true,
Color = Color.Gray,
TextSize = 14 * Resources.DisplayMetrics.Density
};
float textWidth = paintText.MeasureText(_preset.Bands[_preset.Bands.Count - 1].CenterString);
canvas.DrawText(_preset.Bands[0].CenterString, padding * 2, Height - (padding * 2), paintText);
canvas.DrawText(_preset.Bands[_preset.Bands.Count - 1].CenterString, Width - textWidth - (padding * 2), Height - (padding * 2), paintText);
if (_preset == null)
return;
// Draw equalizer line
var points = new List<float>();
var paintEQLine = new Paint
{
AntiAlias = true,
Color = Color.Yellow
};
paintEQLine.SetStyle(Paint.Style.Stroke);
paintEQLine.StrokeWidth = 2f * Resources.DisplayMetrics.Density;
float x = padding;
for (int a = 0; a < _preset.Bands.Count; a++)
{
// Value range is -6 to 6.
var band = _preset.Bands[a];
//float ratio = (band.Gain + 6) / (padding * 2);
float ratio = (band.Gain + 6f) / 12f;
float y = padding + heightAvailable - (ratio * (Height - (padding * 2)));
//Console.WriteLine("EqualizerPresetGraphView - Draw - Width: {0} Height: {1} ratio: {2} x: {3} y: {4} padding: {5} heightAvailable: {6}", Width, Height, ratio, x, y, padding, heightAvailable);
points.Add(x);
points.Add(y);
// Add the same point a second time because Android needs start/end for each segment
if (a > 0 && a < _preset.Bands.Count - 1)
{
points.Add(x);
points.Add(y);
}
x += (Width - (padding * 2)) / (_preset.Bands.Count - 1);
}
canvas.DrawLines(points.ToArray(), paintEQLine);
}
