public void Start(GMapProvider provider, RectLatLng area, int zoom)
{
this.provider = provider;
if (!imageGenWorker.IsBusy)
{
ImageGenArgs args = new ImageGenArgs();
args.Area = area;
args.Zoom = zoom;
imageGenWorker.RunWorkerAsync(args);
}
}
void imageGenWorker_DoWork(object sender, DoWorkEventArgs e)
{
try
{
ImageGenArgs args = (ImageGenArgs)e.Argument;
RectLatLng area = args.Area;
int zoom = args.Zoom;
List <GPoint> tileArea = this.provider.Projection.GetAreaTileList(area, zoom, 0);
string bigImage = zoom + "-" + Guid.NewGuid().ToString() + ".jpg";
// current area
GPoint topLeftPx = this.provider.Projection.FromLatLngToPixel(area.LocationTopLeft, zoom);
GPoint rightButtomPx = this.provider.Projection.FromLatLngToPixel(area.Bottom, area.Right, zoom);
GPoint pxDelta = new GPoint(rightButtomPx.X - topLeftPx.X, rightButtomPx.Y - topLeftPx.Y);
using (Bitmap bmpDestination = new Bitmap((int)(pxDelta.X), (int)(pxDelta.Y)))
{
using (Graphics gfx = Graphics.FromImage(bmpDestination))
{
gfx.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver;
// get tiles & combine into one
int all = tileArea.Count;
int retryCount = 0;
for (int i = 0; i < all; ++i)
{
GPoint pos = tileArea[i];
if (CacheTiles(zoom, pos, provider, gfx, topLeftPx))
{
retryCount = 0;
}
else
{
if (++retryCount <= retry)
{
i--;
continue;
}
else
{
retryCount = 0;
}
}
}
}
#region draw bounds & coordinates & scale
//System.Drawing.Rectangle rect = new System.Drawing.Rectangle();
//{
// rect.Location = new System.Drawing.Point(padding, padding);
// rect.Size = new System.Drawing.Size((int)pxDelta.X, (int)pxDelta.Y);
//}
//using (Font f = new Font(FontFamily.GenericSansSerif, 9, FontStyle.Bold))
//using (Graphics gfx = Graphics.FromImage(bmpDestination))
//{
//// draw bounds & coordinates
//using (Pen p = new Pen(Brushes.Red, 3))
//{
// p.DashStyle = System.Drawing.Drawing2D.DashStyle.DashDot;
// gfx.DrawRectangle(p, rect);
// string topleft = area.LocationTopLeft.ToString();
// SizeF s = gfx.MeasureString(topleft, f);
// gfx.DrawString(topleft, f, p.Brush, rect.X + s.Height / 2, rect.Y + s.Height / 2);
// string rightBottom = new PointLatLng(area.Bottom, area.Right).ToString();
// SizeF s2 = gfx.MeasureString(rightBottom, f);
// gfx.DrawString(rightBottom, f, p.Brush, rect.Right - s2.Width - s2.Height / 2, rect.Bottom - s2.Height - s2.Height / 2);
//}
//// draw scale
//using (Pen p = new Pen(Brushes.Blue, 1))
//{
// double rez = mapControl.MapProvider.Projection.GetGroundResolution(zoom, area.Bottom);
// int px100 = (int)(100.0 / rez); // 100 meters
// int px1000 = (int)(1000.0 / rez); // 1km
// gfx.DrawRectangle(p, rect.X + 10, rect.Bottom - 20, px1000, 10);
// gfx.DrawRectangle(p, rect.X + 10, rect.Bottom - 20, px100, 10);
// string leftBottom = "scale: 100m | 1Km";
// SizeF s = gfx.MeasureString(leftBottom, f);
// gfx.DrawString(leftBottom, f, p.Brush, rect.X + 10, rect.Bottom - s.Height - 20);
//}
//}
#endregion
bmpDestination.Save(bigImage, System.Drawing.Imaging.ImageFormat.Png);
}
}
catch (Exception ex)
{
log.Warn(ex.Message);
MessageBox.Show("拼接图生成错误！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}