void LoadImage(Image image)
{
ImageCache.SetImage(image as Bitmap);
pictureBox.Image = image;
originImage = null;
if (!pictureBox.Visible)
{
lbTip.Visible = pictureBox.Visible = true;
lbTip.BringToFront();
}
FixSize();
}
/// <summary>
/// 获取指定方向上与指定颜色不同的线段
/// </summary>
/// <param name="point"></param>
/// <param name="color"></param>
/// <param name="orient"></param>
/// <param name="span"></param>
static void GetLineSpan(Point point, Color color, Orientions orient, LineSpan span)
{
span.Reset(point);
if (orient == Orientions.Horizontal)
{
// 向左
for (int i = point.X; i >= 0; i--)
{
if (IsSimilarColor(color, ImageCache.Get(i, point.Y)))
{
span.FromX = i;
break;
}
}
// 向右
for (int i = point.X; i < ImageCache.Width; i++)
{
if (IsSimilarColor(color, ImageCache.Get(i, point.Y)))
{
span.ToX = i;
break;
}
}
return;
}
// 向上
for (int i = point.Y; i >= 0; i--)
{
if (IsSimilarColor(color, ImageCache.Get(point.X, i)))
{
span.FromY = i;
break;
}
}
// 向下
for (int i = point.Y; i < ImageCache.Height; i++)
{
if (IsSimilarColor(color, ImageCache.Get(point.X, i)))
{
span.ToY = i;
break;
}
}
}
private void menuPaste_Click(object sender, EventArgs e)
{
if (Clipboard.ContainsImage())
{
var img = Clipboard.GetImage();
ImageCache.SetImage(img as Bitmap);
Text = string.Format("图片查看器 - 来自剪贴板 ({0}x{1})", ImageCache.Width, ImageCache.Height);
LoadImage(img);
return;
}
if (Clipboard.ContainsFileDropList())
{
var file = Clipboard.GetFileDropList().Cast <string>()
.Where(f => ViewerUtil.SUPPORTED_IMAGES_TYPES.Contains(Path.GetExtension(f))).FirstOrDefault();
if (file == null)
{
return;
}
LoadImage(file);
}
}
/// <summary>
/// 获取指定点最近的闭合区域
/// </summary>
/// <param name="img"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="drawLine"></param>
/// <param name="drawBorder"></param>
/// <returns></returns>
internal static Rectangle GetNearestArea(Bitmap img, int x, int y, bool drawLine, bool drawBorder)
{
var width = ImageCache.Width;
var height = ImageCache.Height;
// step1: 取到当前点的颜色
var color = ImageCache.Get(x, y);
fillColor = GetContrastColor(color);
// step1: 找到最近的不同颜色
// 从4个方向，按顺序 上右下左 依次判断
// 取色的偏移量
var offset = 1;
// 找到不同点后，用来填充的颜色
//var fill = Color.Red;
// 找出四个方向的不同点
Color topColor = Color.Empty,
rightColor = Color.Empty,
bottomColor = Color.Empty,
leftColor = Color.Empty,
lastTopColor = Color.Empty,
lastRightColor = Color.Empty,
lastBottomColor = Color.Empty,
lastLeftColor = Color.Empty;
Point topPos = Point.Empty,
rightPos = Point.Empty,
bottomPos = Point.Empty,
leftPos = Point.Empty;
//var topSpan = new LineSpan();
//var rightSpan = new LineSpan();
//var bottomSpan = new LineSpan();
//var leftSpan = new LineSpan();
while (true)
{
// 上
var top = y - offset;
if (topPos.IsEmpty)
{
if (top < 0)
{
// 边界处理
topPos = new Point(x, 0);
topColor = ImageCache.Get(x, 0);
//drawLine(img, x, 0, Orient.Horison);
}
else
{
topColor = ImageCache.Get(x, top);
if (IsSimilarColor(topColor, color) || IsSimilarColor(topColor, lastTopColor))
{
lastTopColor = topColor;
topColor = Color.Empty;
}
else
{
topPos = new Point(x, top);
//img.SetPixel(x, top, fill);
//drawLine(img, x, top, Orient.Horison);
}
}
}
// 右
var right = x + offset;
if (rightPos.IsEmpty)
{
if (right >= width)
{
// 边界处理
rightPos = new Point(width - 1, y);
rightColor = ImageCache.Get(width - 1, y);
//drawLine(img, width - 1, y, Orient.Vertical);
}
else
{
rightColor = ImageCache.Get(right, y);
if (IsSimilarColor(rightColor, color) || IsSimilarColor(rightColor, lastRightColor))
{
lastRightColor = rightColor;
rightColor = Color.Empty;
}
else
{
rightPos = new Point(right, y);
//img.SetPixel(right, y, fill);
//drawLine(img, right, y, Orient.Vertical);
}
}
}
// 下
var bottom = y + offset;
if (bottomPos.IsEmpty)
{
if (bottom >= height)
{
// 边界处理
bottomPos = new Point(x, height - 1);
bottomColor = ImageCache.Get(x, height - 1);
//drawLine(img, x, height - 1, Orient.Horison);
}
else
{
bottomColor = ImageCache.Get(x, bottom);
if (IsSimilarColor(bottomColor, color) || IsSimilarColor(bottomColor, lastBottomColor))
{
lastBottomColor = bottomColor;
bottomColor = Color.Empty;
}
else
{
bottomPos = new Point(x, bottom);
//img.SetPixel(x, bottom, fill);
//drawLine(img, x, bottom, Orient.Horison);
}
}
}
// 左
var left = x - offset;
if (leftPos.IsEmpty && left >= 0)
{
if (left < 0)
{
// 边界处理
leftPos = new Point(0, y);
leftColor = ImageCache.Get(0, y);
//drawLine(img, 0, y, Orient.Vertical);
}
else
{
leftColor = ImageCache.Get(left, y);
if (IsSimilarColor(leftColor, color) || IsSimilarColor(leftColor, lastLeftColor))
{
lastLeftColor = leftColor;
leftColor = Color.Empty;
}
else
{
leftPos = new Point(left, y);
//img.SetPixel(left, y, fill);
//drawLine(img, left, y, Orient.Vertical);
}
}
}
// 4个方向都找到了
if (!topPos.IsEmpty && !rightPos.IsEmpty && !bottomPos.IsEmpty && !leftPos.IsEmpty)
{
//if (IsPointsValid(img, color,
// ref topPos, ref rightPos, ref bottomPos, ref leftPos,
// topColor, rightColor, bottomColor, leftColor,
// topSpan, rightSpan, bottomSpan, leftSpan))
{
break;
}
//continue;
}
// 四个方向都找不到
if (left < 0 && right >= width && top < 0 && bottom >= height)
{
//Console.WriteLine("4个方向都找不到不同的点");
break;
}
offset++;
}
if (drawLine)
{
// 从光标处画十字线
// 画水平线
for (int i = leftPos.X; i < rightPos.X; i++)
{
img.SetPixel(i, y, fillColor);
}
// 画垂直线
for (int i = topPos.Y; i < bottomPos.Y; i++)
{
img.SetPixel(x, i, fillColor);
}
}
//Console.WriteLine("TOP:{0},RIGHT:{1},BOTTOM:{2},LEFT:{3}", topPos, rightPos, bottomPos, leftPos);
var rect = new Rectangle(leftPos.X, topPos.Y, rightPos.X - leftPos.X, bottomPos.Y - topPos.Y);
if (drawBorder)
{
var rightTop = new Point(rect.X + rect.Width, rect.Y);
var rightBottom = new Point(rect.X + rect.Width, rect.Y + rect.Height);
var leftBottom = new Point(rect.X, rect.Y + rect.Height);
var leftTop = new Point(rect.X, rect.Y);
// top
DrawLine(img, rightTop, rightBottom);
// right
DrawLine(img, leftTop, rightTop);
// bottom
DrawLine(img, rightBottom, leftBottom);
// left
DrawLine(img, leftBottom, leftTop);
}
return(rect);
}
