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SevenSegmentDisplay.cs
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SevenSegmentDisplay.cs
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// #define showSegmentLetters // uncomment this to see a-g label
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NeuralNetworkToCount;
/// <summary>
/// Class to render a 7 segment display (257px x 340px)
/// </summary>
internal static class SevenSegmentDisplay
{
/// <summary>
/// Draws the chosen 7 segment display to an image.
/// </summary>
/// <param name="segments">Segments (in order) representing a-g.</param>
internal static Bitmap Output(int value)
{
if (value < 0 || value > 9) throw new ArgumentOutOfRangeException(nameof(value), "digit displays 0-9");
// map for value into segments to light.
// e.g. if the count is a "1" we light segments "a"-"f" but not "g" (g would make "0" an "8").
double[][] segmentsToLight = {
// a,b,c,d,e,f,g
new double[]{ 1,1,1,1,1,1,0}, // 0
new double[]{ 0,1,1,0,0,0,0}, // 1
new double[]{ 1,1,0,1,1,0,1}, // 2
new double[]{ 1,1,1,1,0,0,1}, // 3
new double[]{ 0,1,1,0,0,1,1}, // 4
new double[]{ 1,0,1,1,0,1,1}, // 5
new double[]{ 1,0,1,1,1,1,1}, // 6
new double[]{ 1,1,1,0,0,0,0}, // 7
new double[]{ 1,1,1,1,1,1,1}, // 8
new double[]{ 1,1,1,1,0,1,1} // 9
};
/* 7 segments are annotated as follows:
*
* [-a-]
* [|] [|]
* [f] [b]
* [|] [|]
* [-g-]
* [|] [|]
* [e] [c]
* [|] [|]
* [-d-] (#)
*/
Bitmap image = new(257, 340);
using Graphics graphics = Graphics.FromImage(image);
graphics.Clear(Color.Black);
graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
// add the (o) decimal point for completeness
using SolidBrush brush = new(Color.FromArgb(15, 154, 139, 139));
graphics.FillEllipse(brush, new Rectangle(200, 274, 37, 37));
// light segments where segment contains a "1".
for (int segment = 0; segment < segmentsToLight[value].Length; segment++)
{
DrawSegmentOn7SegmentDisplay(segmentToLight: segment,
illuminateSegment: segmentsToLight[value][segment] == 1,
graphics); // 0.8 is a threshold to treat as 1
}
graphics.Flush();
return image;
}
/// <summary>
/// Draws a segment in the desired position either grey, or red.
/// </summary>
/// <param name="segmentToLight"></param>
/// <param name="illuminateSegment"></param>
/// <param name="graphics"></param>
private static void DrawSegmentOn7SegmentDisplay(int segmentToLight, bool illuminateSegment, Graphics graphics)
{
// color RED if segment is to be illuminated, else greyish colour.
using SolidBrush brushToPaintSegment = new(illuminateSegment ? Color.FromArgb(255, 255, 89, 99) : Color.FromArgb(15, 154, 139, 139));
// the shapes for the segments I created by grabbing a photo from Google images, and working out where the points lie on it.
Point[] pointsDefiningSegmentShape = Array.Empty<Point>(); // populated based on segment, then colour filled
/* segments are elements[]
* a 0
* f b 5 1
* g 6
* e c 4 2
* d 3
*/
switch (segmentToLight)
{
case 0: // a
pointsDefiningSegmentShape = new Point[]
{
new Point(85,43),
new Point(96,58),
new Point(203,58),
new Point(221,43),
new Point(217,36),
new Point(94,36)
};
break;
case 1: // b
pointsDefiningSegmentShape = new Point[]
{
new Point(206,62),
new Point(188,153),
new Point(213,166),
new Point(232,55),
new Point(227,50)
};
break;
case 2: // c
pointsDefiningSegmentShape = new Point[]
{
new Point(184,188),
new Point(168,273),
new Point(182,288),
new Point(192,280),
new Point(210,178)
};
break;
case 3: // d
pointsDefiningSegmentShape = new Point[]
{
new Point(61,278),
new Point(163,278),
new Point(175,294),
new Point(166,303),
new Point(50,303),
new Point(42,294)
};
break;
case 4: // e
pointsDefiningSegmentShape = new Point[]
{
new Point(56,274),
new Point(69,186),
new Point(48,175),
new Point(28,281),
new Point(37,289)
};
break;
case 5: // f
pointsDefiningSegmentShape = new Point[]
{
new Point(79,52),
new Point(67,58),
new Point(49,165),
new Point(76,152),
new Point(92,66)
};
break;
case 6: // g
pointsDefiningSegmentShape = new Point[]
{
new Point(59,169),
new Point(75,181),
new Point(182,181),
new Point(203,170),
new Point(185,158),
new Point(79,158)
};
break;
}
// paint the segment solid colour
graphics.FillPolygon(brushToPaintSegment, pointsDefiningSegmentShape);
// label the "segment" a-g, placed by computing center of the segment shape
Point min = new(int.MaxValue, int.MaxValue);
Point max = new(0, 0);
// min and max of x/y directions enables the center to be determined (it's half way in both directions)
foreach (Point point in pointsDefiningSegmentShape)
{
if (point.X < min.X) min.X = point.X;
if (point.X > max.X) max.X = point.X;
if (point.Y < min.Y) min.Y = point.Y;
if (point.Y > max.Y) max.Y = point.Y;
}
#if showSegmentLetters
using Font fontForLabel = new("Arial", 8);
// 97 = "a".
string label = $"{Char.ConvertFromUtf32(97 + segmentToLight)}";
// centre is average of min+max. Think min=10, max=15, avg = (10+15)/2. We have to account for size of the label.
SizeF sizeOfLabel = graphics.MeasureString(label, fontForLabel);
using SolidBrush brushLabel = new SolidBrush(Color.FromArgb(150, 255, 255, 255));
graphics.DrawString(label, fontForLabel, brushLabel, new PointF((min.X + max.X) / 2 - sizeOfLabel.Width / 2, (min.Y + max.Y) / 2 - sizeOfLabel.Height / 2));
#endif
}
}