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osu-lazer/osu.Game/Graphics/UserInterface/LineGraph.cs

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3.7 KiB
C#
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2018-04-13 17:19:50 +08:00
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Caching;
using OpenTK;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Lines;
namespace osu.Game.Graphics.UserInterface
{
public class LineGraph : Container
{
/// <summary>
/// Manually set the max value, otherwise <see cref="Enumerable.Max(IEnumerable{float})"/> will be used.
/// </summary>
public float? MaxValue { get; set; }
/// <summary>
/// Manually set the min value, otherwise <see cref="Enumerable.Min(IEnumerable{float})"/> will be used.
/// </summary>
public float? MinValue { get; set; }
public float ActualMaxValue { get; private set; } = float.NaN;
public float ActualMinValue { get; private set; } = float.NaN;
private const double transform_duration = 1500;
/// <summary>
/// Hold an empty area if values are less.
/// </summary>
public int DefaultValueCount;
private readonly Container<Path> maskingContainer;
private readonly Path path;
private float[] values;
/// <summary>
/// A list of floats decides position of each line node.
/// </summary>
public IEnumerable<float> Values
{
get { return values; }
set
{
values = value.ToArray();
float max = values.Max(), min = values.Min();
if (MaxValue > max) max = MaxValue.Value;
if (MinValue < min) min = MinValue.Value;
ActualMaxValue = max;
ActualMinValue = min;
pathCached.Invalidate();
maskingContainer.Width = 0;
maskingContainer.ResizeWidthTo(1, transform_duration, Easing.OutQuint);
}
}
public LineGraph()
{
Add(maskingContainer = new Container<Path>
{
Masking = true,
RelativeSizeAxes = Axes.Both,
Child = path = new Path { RelativeSizeAxes = Axes.Both, PathWidth = 1 }
});
}
public override bool Invalidate(Invalidation invalidation = Invalidation.All, Drawable source = null, bool shallPropagate = true)
{
if ((invalidation & Invalidation.DrawSize) > 0)
pathCached.Invalidate();
return base.Invalidate(invalidation, source, shallPropagate);
}
private Cached pathCached = new Cached();
protected override void Update()
{
base.Update();
if (!pathCached.IsValid)
{
applyPath();
pathCached.Validate();
}
}
private void applyPath()
{
path.ClearVertices();
if (values == null) return;
int count = Math.Max(values.Length, DefaultValueCount);
for (int i = 0; i < values.Length; i++)
{
float x = (i + count - values.Length) / (float)(count - 1) * DrawWidth - 1;
float y = GetYPosition(values[i]) * DrawHeight - 1;
// the -1 is for inner offset in path (actually -PathWidth)
path.AddVertex(new Vector2(x, y));
}
}
protected float GetYPosition(float value)
{
if (ActualMaxValue == ActualMinValue) return 0;
return (ActualMaxValue - value) / (ActualMaxValue - ActualMinValue);
}
}
}