public void CI_InsertPairTest_08_ThickLines()
{
string testObject = "ContourImage.ScanObject";
Color backgroundColor = Color.White;
Color foregroundColor = Color.Black;
Brush fgBrush = new SolidBrush(foregroundColor);
Pen fgPen = new Pen(fgBrush, 8);
fgPen.StartCap = fgPen.EndCap = System.Drawing.Drawing2D.LineCap.Round;
// When painting into the image, leave an outer frame of 16 pixels free.
// Only use the range 50..250.
int width = 300, height = 300;
Bitmap image = new Bitmap(width, height);
Graphics g = Graphics.FromImage(image);
int contourDist = SWA_Ariadne_Gui_Mazes_ContourImageAccessor.ContourDistance;
int blurDist = SWA_Ariadne_Gui_Mazes_ContourImageAccessor.BlurDistanceMax;
SWA_Ariadne_Gui_Mazes_ContourImageAccessor.PrepareInfluenceRegions(contourDist + blurDist);
int[,] alpha = new int[width, height];
List <int>[] objectXs, contourXs, borderXs;
SWA_Ariadne_Gui_Mazes_ContourImageAccessor.InitializeScanLines(width, height, out objectXs, out contourXs, out borderXs);
#region Create a complicated pattern of border scan lines.
Point[] points =
{
new Point(50, 50), new Point(250, 250),
new Point(200, 100), new Point(100, 200),
};
g.FillRectangle(new SolidBrush(backgroundColor), 0, 0, image.Width, image.Height);
for (int i = 0, j = i + 1; j < points.Length; i++, j++)
{
g.DrawLine(fgPen, points[i], points[j]);
}
#endregion
ContourImage target = new ContourImage(image);
SWA_Ariadne_Gui_Mazes_ContourImageAccessor accessor = new SWA_Ariadne_Gui_Mazes_ContourImageAccessor(target);
accessor.image = image;
int y0 = image.Height / 2;
#region Find the leftmost object pixel on the scan line at y0.
int x0 = 0;
int fuzziness = (int)(0.1F * SWA_Ariadne_Gui_Mazes_ContourImageAccessor.MaxColorDistance);
while (accessor.ColorDistance(image.GetPixel(x0, y0)) <= fuzziness)
{
x0++;
}
#endregion
accessor.ScanObject(x0, y0, fuzziness, alpha, objectXs, contourXs, borderXs);
TestBorderScanlines(testObject, borderXs);
}
private static void TestScan(string testObject, Bitmap image, Color backgroundColor, int y0, int maxContourScanRegions)
{
testObject += " @ " + y0.ToString();
int fuzziness = (int)(0.1F * SWA_Ariadne_Gui_Mazes_ContourImageAccessor.MaxColorDistance);
int frameWidth = SWA_Ariadne_Gui_Mazes_ContourImageAccessor.ContourDistance;
SWA_Ariadne_Gui_Mazes_ContourImageAccessor.PrepareInfluenceRegions(frameWidth);
ContourImage target = new ContourImage(image);
SWA_Ariadne_Gui_Mazes_ContourImageAccessor accessor = new SWA_Ariadne_Gui_Mazes_ContourImageAccessor(target);
accessor.image = image;
#region Find the leftmost object pixel on the scan line at y0.
int x0 = 0;
while (accessor.ColorDistance(image.GetPixel(x0, y0)) <= fuzziness)
{
x0++;
if (x0 >= image.Width)
{
return;
}
}
#endregion
#region Prepare required data structures.
int width = image.Width, height = image.Height;
int[,] alpha = new int[width, height];
List <int>[] objectXs, contourXs, borderXs;
SWA_Ariadne_Gui_Mazes_ContourImageAccessor.InitializeScanLines(width, height, out objectXs, out contourXs, out borderXs);
#endregion
accessor.ScanObject(x0, y0, fuzziness, alpha, objectXs, contourXs, borderXs);
#region Test if the object map is well formed.
for (int i = 0; i < height; i++)
{
int nEntries = objectXs[i].Count;
int m = nEntries % 2;
Assert.AreEqual(1, m, testObject + string.Format(" - objectXs[{0}] must be an odd number: {1}", i, nEntries));
int nRegions = (nEntries - 1) / 2;
Assert.IsTrue(nRegions <= maxContourScanRegions, testObject + string.Format(" - objectXs[{0}] regions = {1} must be less than {2}", i, nRegions, maxContourScanRegions));
}
#endregion
#region Test if the object map is complete.
int imageArea = ImageArea(image, backgroundColor, (float)fuzziness / SWA_Ariadne_Gui_Mazes_ContourImageAccessor.MaxColorDistance);
int objectArea = ObjectArea(objectXs);
Assert.AreEqual(imageArea, objectArea, testObject + string.Format(" - object area and image area must be equal"));
#endregion
// Test if the contour map is well formed.
TestBorderScanlines(testObject + " - contourXs", contourXs);
// Test if the border map is well formed.
TestBorderScanlines(testObject + " - borderXs", borderXs);
}
