1 | using System.Drawing.Drawing2D;
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2 | using SharpMap;
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3 | using SharpMap.Rendering.Decoration;
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4 | using System;
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5 | using System.Drawing;
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6 |
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7 | using System.Globalization;
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8 |
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9 |
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10 | namespace HeuristicLab.BioBoost.Views.MapViews {
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11 | public class GradientLegend : MapDecoration {
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12 | public Size Size { get; set; }
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13 | public double MinValue { get; set; }
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14 | public double MaxValue { get; set; }
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15 | public ColorBlend ColorBlend { get; set; }
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16 | public Point Offset { get; set; }
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17 | public Font Font { get; set; }
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18 | public String Unit { get; set; }
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19 |
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20 | public GradientLegend() {
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21 | Size = new Size(150, 20);
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22 | Anchor = MapDecorationAnchor.LeftBottom;
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23 | MinValue = 0;
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24 | MaxValue = 1;
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25 | Offset = new Point(10, 10);
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26 | // color blend does not match the gradient legend exactly
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27 | /*
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28 | ColorBlend = new ColorBlend {
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29 | Colors = new[] {
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30 | Color.FromArgb(0, 0, 127),
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31 | Color.FromArgb(0, 0, 255),
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32 | Color.FromArgb(0, 255, 255),
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33 | Color.FromArgb(0, 255, 0),
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34 | Color.FromArgb(127, 255, 0),
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35 | Color.FromArgb(255, 255, 0),
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36 | Color.FromArgb(255, 127, 0),
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37 | Color.FromArgb(255, 0, 0),
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38 | Color.FromArgb(127, 0, 0)},
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39 | Positions = new[] { 0.0f, 0.125f, 0.25f, 0.375f, 0.5f, 0.625f, 0.75f, 0.875f, 1f }
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40 | };
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41 | */
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42 | // GradientLegend uses ColorBlend from System.Drawing and we need to convert it to a SharpMap colorblend here
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43 | ColorBlend = new ColorBlend() {
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44 | Colors = LazyValueLayerGenerator.DefaultColorBlend.Colors,
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45 | Positions = LazyValueLayerGenerator.DefaultColorBlend.Positions
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46 | };
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47 | Font = (Font)SystemFonts.DefaultFont.Clone();
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48 | }
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49 |
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50 | protected override Size InternalSize(Graphics g, Map map) {
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51 | return new Size(Size.Width + Offset.X + 4, Size.Height + Offset.Y + 3);
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52 | }
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53 |
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54 | protected override void OnRender(Graphics g, Map map) {
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55 | var pos = new PointF(g.ClipBounds.Left + Offset.X, g.ClipBounds.Bottom - Offset.Y - Size.Height);
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56 | var brush = new System.Drawing.Drawing2D.LinearGradientBrush(pos, new PointF(pos.X + Size.Width, pos.Y), Color.Black, Color.Black) {
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57 | InterpolationColors = ColorBlend
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58 | };
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59 | g.FillRectangle(new SolidBrush(Color.FromArgb(127, 255, 255, 255)),
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60 | pos.X - 1, pos.Y - 1, Size.Width + 3, Size.Height + 2);
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61 | var minStr = MinValue.ToString(CultureInfo.InvariantCulture);
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62 | var maxStr = MaxValue.ToString("G4", CultureInfo.InvariantCulture);
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63 | if (!String.IsNullOrEmpty(Unit)) maxStr += " " + Unit;
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64 | var minDim = g.MeasureString(minStr, Font);
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65 | var maxDim = g.MeasureString(maxStr, Font);
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66 | var textHeight = Math.Min(minDim.Height, maxDim.Height);
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67 | g.FillRectangle(brush, pos.X, pos.Y + textHeight, Size.Width, Size.Height - textHeight - 2);
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68 | g.DrawString(minStr, Font, Brushes.Black, pos.X, pos.Y);
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69 | g.DrawString(maxStr, Font, Brushes.Black, pos.X + Size.Width - maxDim.Width - 2, pos.Y);
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70 | g.DrawLine(Pens.Black, pos.X, pos.Y, pos.X, pos.Y + Size.Height);
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71 | g.DrawLine(Pens.Black, pos.X + Size.Width, pos.Y, pos.X + Size.Width, pos.Y + Size.Height);
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72 |
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73 | g.DrawLine(Pens.Black, pos.X + Size.Width / 4, pos.Y + textHeight, pos.X + Size.Width / 4, pos.Y + Size.Height);
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74 | g.DrawLine(Pens.Black, pos.X + Size.Width / 2, pos.Y + textHeight / 2, pos.X + Size.Width / 2, pos.Y + Size.Height);
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75 | g.DrawLine(Pens.Black, pos.X + Size.Width / 4 * 3, pos.Y + textHeight, pos.X + Size.Width / 4 * 3, pos.Y + Size.Height);
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76 | }
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77 |
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78 | }
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79 | }
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