1 | using System;
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2 | using System.Drawing;
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3 |
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4 | namespace HeuristicLab.Visualization {
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5 | public class Grid : PrimitiveBase, IGrid {
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6 | protected const int CellSpacing = 10;
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7 |
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8 | public virtual PointD Origin { get; set; }
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9 | public virtual PointD Offset { get; set; }
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10 | public virtual SizeD Size { get; set; }
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11 |
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12 | public virtual double XPrecision { get; set; }
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13 | public virtual double YPrecision { get; set; }
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14 |
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15 | public virtual PointD GetBottomLeftGridPoint(PointD point) {
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16 | var nx = (int)Math.Floor((point.X - Origin.X) / XPrecision);
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17 | var ny = (int)Math.Floor((point.Y - Origin.Y) / YPrecision);
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18 | return new PointD(Origin.X + nx * XPrecision, Origin.Y + ny * YPrecision);
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19 | }
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20 |
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21 | public virtual PointD GetUpperRightGridPoint(PointD point) {
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22 | var nx = (int)Math.Ceiling((point.X - Origin.X) / XPrecision);
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23 | var ny = (int)Math.Ceiling((point.Y - Origin.Y) / YPrecision);
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24 | return new PointD(Origin.X + nx * XPrecision, Origin.Y + ny * YPrecision);
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25 | }
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26 |
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27 | public virtual PointD GetNearestGridPoint(PointD point) {
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28 | var bl = GetBottomLeftGridPoint(point);
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29 | var ur = GetUpperRightGridPoint(point);
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30 | return new PointD(
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31 | Math.Abs(bl.X - point.X) <= Math.Abs(ur.X - point.X) ? bl.X : ur.X,
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32 | Math.Abs(bl.Y - point.Y) <= Math.Abs(ur.Y - point.Y) ? bl.Y : ur.Y);
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33 | }
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34 |
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35 | public Grid(IChart chart, PointD offset, SizeD size)
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36 | : this(chart, offset, size, 1) { }
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37 | public Grid(IChart chart, PointD offset, SizeD size, double precision)
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38 | : base(chart) {
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39 | Origin = new PointD(0, 0);
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40 | Offset = offset;
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41 | Size = size;
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42 | XPrecision = precision;
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43 | YPrecision = precision;
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44 | }
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45 |
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46 | public override bool ContainsPoint(PointD point) {
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47 | return false;
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48 | }
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49 |
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50 | public override void Move(Offset delta) {
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51 | Offset += delta;
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52 | }
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53 |
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54 | public override void Move(PointD point, Offset delta) {
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55 | Move(delta);
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56 | }
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57 |
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58 | public override void SnapToGrid(IGrid grid) { }
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59 |
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60 | public override void SnapToGrid(PointD point, IGrid grid) { }
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61 |
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62 | public override void Draw(Graphics graphics) {
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63 | if (!(Size.Width > 0) || !(Size.Height > 0)) return;
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64 | graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;
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65 | var pen = new Pen(Color.LightGray, 1.0f);
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66 | var pixelSize = Chart.TransformWorldToPixel(Size); // size of the drawing area in pixel coordinates
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67 |
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68 | var numberOfXParallelLines = (int)Math.Floor(pixelSize.Height / (double)CellSpacing); // how many x parallel lines can be drawn
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69 | var numberOfYParallelLines = (int)Math.Floor(pixelSize.Width / (double)CellSpacing); // how many y parallel lines can be drawn
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70 | if (numberOfXParallelLines <= 0 || numberOfYParallelLines <= 0) return;
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71 | var cellWorldSize = new SizeD(Size.Width / numberOfYParallelLines, Size.Height / numberOfXParallelLines); // the cellSize in world coordinates
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72 | cellWorldSize.Width = Math.Pow(10, Math.Floor(Math.Log10(cellWorldSize.Width)));
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73 | cellWorldSize.Height = Math.Pow(10, Math.Floor(Math.Log10(cellWorldSize.Width)));
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74 | var cellPixelSize = Chart.TransformWorldToPixel(cellWorldSize);
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75 | while (cellPixelSize.Width < 25 || cellPixelSize.Height < 25) {
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76 | if (cellPixelSize.Width < 25) cellWorldSize.Width *= 2;
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77 | if (cellPixelSize.Height < 25) cellWorldSize.Height *= 2;
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78 | cellPixelSize = Chart.TransformWorldToPixel(cellWorldSize);
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79 | if (cellPixelSize.Width < 25) cellWorldSize.Width *= 2.5;
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80 | if (cellPixelSize.Height < 25) cellWorldSize.Height *= 2.5;
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81 | cellPixelSize = Chart.TransformWorldToPixel(cellWorldSize);
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82 | }
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83 | var firstX = Math.Floor(Offset.X / cellWorldSize.Width) * cellWorldSize.Width;
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84 | var firstY = Math.Floor(Offset.Y / cellWorldSize.Height) * cellWorldSize.Height;
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85 | double x = firstX, y = firstY;
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86 | var axisyLabel = new Font(FontFamily.GenericMonospace, 7.0f, FontStyle.Regular, GraphicsUnit.Point, 0);
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87 | var axisxLabel = new Font(FontFamily.GenericMonospace, 7.0f, FontStyle.Regular, GraphicsUnit.Point, 0, true);
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88 | var axisDrawing = new SolidBrush(Color.DarkGray);
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89 | try {
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90 | var bottom = Chart.TransformWorldToPixel(Size).Height;
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91 | while (x <= Offset.X + Size.Width) {
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92 | var start = Chart.TransformWorldToPixel(new PointD(x, firstY));
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93 | var end = Chart.TransformWorldToPixel(new PointD(x, Offset.Y + Size.Height));
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94 | graphics.DrawLine(pen, start, end);
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95 | var axis = x.ToString("0.##");
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96 | double stringwidth = graphics.MeasureString(axis, axisyLabel).Width;
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97 | graphics.DrawString(axis, axisyLabel, axisDrawing, end.X - (int)(stringwidth / 2.0), bottom - 15);
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98 | x += cellWorldSize.Width;
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99 | }
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100 | while (y <= Offset.Y + Size.Height) {
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101 | var start = Chart.TransformWorldToPixel(new PointD(firstX, y));
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102 | var end = Chart.TransformWorldToPixel(new PointD(Offset.X + Size.Width, y));
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103 | graphics.DrawLine(pen, start, end);
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104 | graphics.DrawString(y.ToString("0.##"), axisxLabel, axisDrawing, 0, start.Y);
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105 | y += cellWorldSize.Height;
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106 | }
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107 | } finally {
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108 | axisDrawing.Dispose();
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109 | axisxLabel.Dispose();
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110 | axisyLabel.Dispose();
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111 | }
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112 | }
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113 | }
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114 | }
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