private void CropPictureBox_SizeChanged(object sender, EventArgs e)
{
CropPictureBox.Invalidate();
if (CropPictureBox.Image != null)
{
OnCropPictureBoxResize();
}
}
/// <summary>
/// イメージ上に四角を描画する
/// </summary>
/// <param name="startPoint"></param>
/// <param name="endPoint"></param>
private void DrawRectangleInCropPictureBox(Point startPoint, Point endPoint)
{
using (Pen pen = new Pen(Color.Red))
using (Graphics graphics = CropPictureBox.CreateGraphics())
{
pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
CropPictureBox.Refresh();
graphics.DrawRectangle(pen, startPoint.X, startPoint.Y, Math.Abs(startPoint.X - endPoint.X), Math.Abs(startPoint.Y - endPoint.Y));
}
}
private void CropPictureBox_MouseDown(object sender, MouseEventArgs e)
{
CropPictureBox.Invalidate();
_cropArea.X = e.X;
_cropArea.Y = e.Y;
_cropArea.Width = 0;
_cropArea.Height = 0;
_isMouseDown = true;
}
private void CropPictureBox_MouseMove(object sender, MouseEventArgs e)
{
if (_isMouseDown)
{
_cropArea.Width = (e.X - _cropArea.X);
_cropArea.Height = (e.Y - _cropArea.Y);
if (_cropAreaBounds.Contains(_cropArea))
{
CropPictureBox.Invalidate();
}
}
}
