【发布时间】：2011-06-13 19:21:47
【问题描述】：
好吧，我正在创建一个应用程序，我使用 for 循环基本上读取图像的每个像素，寻找像素颜色的模式（简单的东西）无论如何，由于某种原因，我的应用程序只是锁定并且永远不会恢复正常.我一遍又一遍地循环代码，没有发现任何真正的问题。
我唯一注意到的是，ScanPixelsLater 中的 for 循环可能会提前退出。我已经尽可能多地注释了代码，
private Point topLeftc, bottomLeftc, topRightc, bottomRightc;
/// <summary>
/// Starts the initial looping process, designed only to loop through ONCE, ScanPixelsLater takes over
/// </summary>
/// <param name="img">Image to scan</param>
public void ScanPixels(Bitmap img)
{
int whitePixel = 0;
for (int y = 100; y < img.Height; y++)
{
for (int x = 100; x < img.Width; x++)
{
if (img.GetPixel(x, y) == Color.FromArgb(255, 255, 255, 255))
{
// img.SetPixel(x, y, Color.Green);
whitePixel++;
}
else { whitePixel = 0; }
if (whitePixel == 18)
{
whitePixel = 0;
topLeftc = new Point(x - 18, y);
DetectNextWhiteLine(topLeftc, img);
}
}
}
}
/// <summary>
/// First creates the TopRight value via using the last pixel in x range, and using the current Y value
/// Then a Y loop is started 10 pixels down, within this loop is another X loop which scans the X range
/// If 10 consecutive white pixels are found, the TopLeft X value and the current Y value are used to map the
/// BottomLeft and BottomRight coordinates. Finally a new Point is created which starts (x = 1) and (y = currentYValue + 2)
/// The ScanPixelsLater method is then called, passing the new Point (newLocation).
///
/// </summary>
/// <param name="p">The x and y value of where the pixels were found</param>
/// <param name="img">Image being used</param>
private void DetectNextWhiteLine(Point p, Bitmap img)
{
int whitePixel = 0;
topRightc = new Point(img.Width, topLeftc.Y);
for (int y = p.Y + 10; y < img.Height; y++)
{
for (int x = p.X - 5; x < img.Width; x++)
{
if (img.GetPixel(x, y) == Color.FromArgb(255, 255, 255, 255))
{
whitePixel++;
}
else
{
whitePixel = 0;
}
if (whitePixel == 10)
{
bottomLeftc = new Point(topLeftc.X, y);
bottomRightc = new Point(img.Width, y);
Cords.Add(new Coordinates(topLeftc, topRightc, bottomLeftc, bottomRightc));
Point newLocation = new Point(1, y + 2);
calls++;
ScanPixelsLater(newLocation, img); //rescan the image from new y axis
}
}
}
}
/// <summary>
/// Loops through the pixels based on the p parameter, if 15 white pixels are found, the location (x & y) is
/// passed to the DetectNextWhiteLine method which fixes the next line with a similar number of white pixels.
/// </summary>
/// <param name="p">The Point(x,y) at which to start scanning</param>
/// <param name="img"></param>
private void ScanPixelsLater(Point p, Bitmap img)
{
int whitePixel = 0;
for (int y = p.Y; y < img.Height; y++)
{
for (int x = p.X; x < img.Width; x++)
{
if (img.GetPixel(x, y) == Color.FromArgb(255, 255, 255, 255))
{
whitePixel++;
}
else
{
whitePixel = 0;
}
if (whitePixel == 15)
{
bottomLeftc = new Point(topLeftc.X, y);
topLeftc = new Point(x - 15, y);
calls++;
DetectNextWhiteLine(topLeftc, img);
}
}
}
// only want this to execute after all the pixels within the entire img have been read
// possibly executing early.
DrawWhiteLines(img);
AppArgs aa = new AppArgs(true);
Change(this, aa); // custom event handler, fired behind form to update GUI
}
【问题讨论】：
标签： c# loops for-loop nested-loops