/// <summary>
/// 轉換圖片有效範圍
/// </summary>
/// <param name="pCharsCount">int-字元數量</param>
public void ConvertBmpValidRange(int pCharsCount)
{
// 圖片最大 X, Y，處理後變成起始 X, Y
int posX1 = BmpSource.Width, posY1 = BmpSource.Height;
// 圖片起始 X, Y，處理後變成最大 X, Y
int posX2 = 0, posY2 = 0;
// 取得有效範圍區域
for (int i = 0; i < BmpSource.Height; i++)
{
for (int j = 0; j < BmpSource.Width; j++)
{
int pixelVal = BmpSource.GetPixel(j, i).R;
if (pixelVal < GrayValue) // 如像該素值低於指定灰階值則進行縮小區域
{
if (posX1 > j)
{
posX1 = j; // 如 X2 像素位置大於圖片寬度則縮小寬度
}
if (posY1 > i)
{
posY1 = i; // 如 Y2 像素位置大於圖片高度則縮小高度
}
if (posX2 < j)
{
posX2 = j; // 如 X1 像素位置小於圖片寬度則縮小寬度
}
if (posY2 < i)
{
posY2 = i; // 如 Y1 像素位置小於圖片寬度則縮小寬度
}
}
}
}
// 確保圖片可以平均切割圖片
int span = pCharsCount - (posX2 - posX1 + 1) % pCharsCount;
if (span < pCharsCount)
{
int leftSpan = span / 2;
if (posX1 > leftSpan)
{
posX1 = posX1 - leftSpan;
}
if (posX2 + span - leftSpan < BmpSource.Width)
{
posX2 = posX2 + span - leftSpan;
}
}
// 產生變更後的圖片
Rectangle cloneRect = new Rectangle(posX1, posY1, posX2 - posX1 + 1, posY2 - posY1 + 1);
BmpSource = BmpSource.Clone(cloneRect, BmpSource.PixelFormat);
}
/// <summary>
/// 切割圖片成指定目標數
/// </summary>
/// <param name="pHorizontalColNumber">int-水平切割數</param>
/// <param name="pVerticalRowNumber">int-垂直切割數</param>
/// <returns></returns>
public Bitmap[] GetSplitPicChars(int pHorizontalColNumber, int pVerticalRowNumber)
{
if (pHorizontalColNumber == 0 || pVerticalRowNumber == 0)
{
return(null);
}
int avgWidth = BmpSource.Width / pHorizontalColNumber;
int avgHeight = BmpSource.Height / pVerticalRowNumber;
// 產生存放圖片容器陣列
Bitmap[] bmpAry = new Bitmap[pHorizontalColNumber * pVerticalRowNumber];
// 重新取得數字區域
Rectangle cloneRect;
for (int i = 0; i < pVerticalRowNumber; i++)
{
for (int j = 0; j < pHorizontalColNumber; j++)
{
cloneRect = new Rectangle(j * avgWidth, i * avgHeight, avgWidth, avgHeight);
bmpAry[i * pHorizontalColNumber + j] = BmpSource.Clone(cloneRect, BmpSource.PixelFormat);
}
}
return(bmpAry);
}