mirror of
https://github.com/sourcegit-scm/sourcegit.git
synced 2024-12-24 20:57:19 -08:00
274 lines
9.6 KiB
C#
274 lines
9.6 KiB
C#
using System.Collections.Generic;
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using System.Linq;
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using System.Windows;
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using System.Windows.Media;
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namespace SourceGit.Helpers {
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/// <summary>
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/// Tools to parse commit graph.
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/// </summary>
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public class CommitGraphMaker {
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/// <summary>
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/// Sizes
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/// </summary>
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public static readonly double UNIT_WIDTH = 12;
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public static readonly double HALF_WIDTH = 6;
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public static readonly double DOUBLE_WIDTH = 24;
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public static readonly double UNIT_HEIGHT = 24;
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public static readonly double HALF_HEIGHT = 12;
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/// <summary>
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/// Colors
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/// </summary>
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public static Brush[] Colors = new Brush[] {
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Brushes.Orange,
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Brushes.ForestGreen,
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Brushes.Gold,
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Brushes.Magenta,
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Brushes.Red,
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Brushes.Gray,
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Brushes.Turquoise,
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Brushes.Olive,
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};
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/// <summary>
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/// Helpers to draw lines.
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/// </summary>
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public class LineHelper {
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private double lastX = 0;
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private double lastY = 0;
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/// <summary>
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/// Parent commit id.
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/// </summary>
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public string Next { get; set; }
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/// <summary>
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/// Is merged into this tree.
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/// </summary>
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public bool IsMerged { get; set; }
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/// <summary>
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/// Points in line
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/// </summary>
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public List<Point> Points { get; set; }
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/// <summary>
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/// Brush to draw line
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/// </summary>
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public Brush Brush { get; set; }
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/// <summary>
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/// Current horizontal offset.
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/// </summary>
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public double HorizontalOffset => lastX;
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="nextCommitId">Parent commit id</param>
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/// <param name="isMerged">Is merged in tree</param>
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/// <param name="colorIdx">Color index</param>
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/// <param name="startPoint">Start point</param>
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public LineHelper(string nextCommitId, bool isMerged, int colorIdx, Point startPoint) {
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Next = nextCommitId;
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IsMerged = isMerged;
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Points = new List<Point>() { startPoint };
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Brush = Colors[colorIdx % Colors.Length];
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lastX = startPoint.X;
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lastY = startPoint.Y;
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}
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/// <summary>
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/// Line to.
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/// </summary>
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/// <param name="x"></param>
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/// <param name="y"></param>
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/// <param name="isEnd"></param>
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public void AddPoint(double x, double y, bool isEnd = false) {
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if (x > lastX) {
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Points.Add(new Point(lastX, lastY));
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Points.Add(new Point(x, y - HALF_HEIGHT));
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} else if (x < lastX) {
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Points.Add(new Point(lastX, lastY + HALF_HEIGHT));
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Points.Add(new Point(x, y));
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}
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lastX = x;
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lastY = y;
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if (isEnd) {
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var last = Points.Last();
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if (last.X != lastX || last.Y != lastY) Points.Add(new Point(lastX, lastY));
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}
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}
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}
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/// <summary>
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/// Short link between two commits.
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/// </summary>
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public struct ShortLink {
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public Point Start;
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public Point Control;
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public Point End;
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public Brush Brush;
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}
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/// <summary>
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/// Dot
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/// </summary>
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public struct Dot {
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public double X;
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public double Y;
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public Brush Color;
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}
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/// <summary>
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/// Independent lines in graph
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/// </summary>
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public List<LineHelper> Lines { get; set; } = new List<LineHelper>();
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/// <summary>
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/// Short links.
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/// </summary>
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public List<ShortLink> Links { get; set; } = new List<ShortLink>();
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/// <summary>
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/// All dots.
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/// </summary>
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public List<Dot> Dots { get; set; } = new List<Dot>();
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/// <summary>
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/// Highlight commit id.
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/// </summary>
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public string Highlight { get; set; }
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/// <summary>
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/// Parse commits.
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/// </summary>
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/// <param name="commits"></param>
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/// <returns></returns>
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public static CommitGraphMaker Parse(List<Git.Commit> commits) {
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CommitGraphMaker maker = new CommitGraphMaker();
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List<LineHelper> unsolved = new List<LineHelper>();
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List<LineHelper> ended = new List<LineHelper>();
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Dictionary<string, LineHelper> currentMap = new Dictionary<string, LineHelper>();
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double offsetY = -HALF_HEIGHT;
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int colorIdx = 0;
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for (int i = 0; i < commits.Count; i++) {
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Git.Commit commit = commits[i];
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LineHelper major = null;
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bool isMerged = commit.IsHEAD || commit.IsMerged;
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int oldCount = unsolved.Count;
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// 更新Y坐标
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offsetY += UNIT_HEIGHT;
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// 找到当前的分支的HEAD，用于默认选中
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if (maker.Highlight == null && commit.IsHEAD) {
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maker.Highlight = commit.SHA;
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}
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// 找到第一个依赖于本提交的树，将其他依赖于本提交的树标记为终止，并对已存在的线路调整（防止线重合）
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double offsetX = -HALF_WIDTH;
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foreach (var l in unsolved) {
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if (l.Next == commit.SHA) {
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if (major == null) {
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offsetX += UNIT_WIDTH;
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major = l;
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if (commit.Parents.Count > 0) {
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major.Next = commit.Parents[0];
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if (!currentMap.ContainsKey(major.Next)) currentMap.Add(major.Next, major);
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} else {
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major.Next = "ENDED";
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}
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major.AddPoint(offsetX, offsetY);
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} else {
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ended.Add(l);
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}
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isMerged = isMerged || l.IsMerged;
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} else {
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if (!currentMap.ContainsKey(l.Next)) currentMap.Add(l.Next, l);
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offsetX += UNIT_WIDTH;
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l.AddPoint(offsetX, offsetY);
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}
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}
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// 处理本提交为非当前分支HEAD的情况（创建新依赖线路）
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if (major == null && commit.Parents.Count > 0) {
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offsetX += UNIT_WIDTH;
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major = new LineHelper(commit.Parents[0], isMerged, colorIdx, new Point(offsetX, offsetY));
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unsolved.Add(major);
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colorIdx++;
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}
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// 确定本提交的点的位置
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Point position = new Point(offsetX, offsetY);
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if (major != null) {
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major.IsMerged = isMerged;
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position.X = major.HorizontalOffset;
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position.Y = offsetY;
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maker.Dots.Add(new Dot() { X = position.X - 3, Y = position.Y - 3, Color = major.Brush });
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} else {
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maker.Dots.Add(new Dot() { X = position.X - 3, Y = position.Y - 3, Color = Brushes.Orange });
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}
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// 处理本提交的其他依赖
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for (int j = 1; j < commit.Parents.Count; j++) {
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var parent = commit.Parents[j];
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if (currentMap.ContainsKey(parent)) {
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var l = currentMap[parent];
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var link = new ShortLink();
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link.Start = position;
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link.End = new Point(l.HorizontalOffset, offsetY + HALF_HEIGHT);
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link.Control = new Point(link.End.X, link.Start.Y);
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link.Brush = l.Brush;
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maker.Links.Add(link);
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} else {
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offsetX += UNIT_WIDTH;
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unsolved.Add(new LineHelper(commit.Parents[j], isMerged, colorIdx, position));
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colorIdx++;
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}
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}
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// 处理已终止的线
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foreach (var l in ended) {
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l.AddPoint(position.X, position.Y, true);
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maker.Lines.Add(l);
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unsolved.Remove(l);
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}
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// 加入本次提交
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commit.IsMerged = isMerged;
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commit.GraphOffset = System.Math.Max(offsetX + HALF_WIDTH, oldCount * UNIT_WIDTH);
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// 清理临时数据
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ended.Clear();
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currentMap.Clear();
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}
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// 处理尚未终结的线
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for (int i = 0; i < unsolved.Count; i++) {
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var path = unsolved[i];
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path.AddPoint((i + 0.5) * UNIT_WIDTH, (commits.Count - 0.5) * UNIT_HEIGHT, true);
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maker.Lines.Add(path);
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}
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unsolved.Clear();
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// 处理默认选中异常
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if (maker.Highlight == null && commits.Count > 0) {
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maker.Highlight = commits[0].SHA;
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}
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return maker;
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}
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}
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}
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