public override void OnMouseMove(ICoordinate worldPosition, MouseEventArgs e)
{
if (!Dragging)
{
return;
}
DragEndPoint = e.Location;
var point = new Point((DragEndPoint.X - DragStartPoint.X),
(DragEndPoint.Y - DragStartPoint.Y));
var previewImage = new Bitmap(DragImage.Width, DragImage.Height);
Graphics g = Graphics.FromImage(previewImage);
g.Clear(MapControl.BackColor);
g.DrawImageUnscaled(DragImage, point);
g.DrawImageUnscaled(StaticToolsImage, 0, 0);
g.Dispose();
g = MapControl.CreateGraphics();
g.DrawImage(previewImage, 0, 0);
g.Dispose();
previewImage.Dispose();
}
public virtual void DoDrawing(bool drawTools)
{
if (!dragging)
{
return;
}
Graphics graphics = Graphics.FromImage(drawingBitmap);
// use transform from map; this enables directly calling ILayer.OnRender
graphics.Transform = Map.MapTransform.Clone();
graphics.Clear(Color.Transparent);
graphics.PageUnit = GraphicsUnit.Pixel;
graphics.Clear(MapControl.BackColor);
graphics.DrawImage(backGroundImage, 0, 0);
if (drawTools)
{
foreach (IMapTool tool in MapControl.Tools)
{
if (tool.IsActive)
{
tool.Render(graphics, Map);
}
}
}
OnDraw(graphics);
Graphics graphicsMap = MapControl.CreateGraphics();
graphicsMap.DrawImage(drawingBitmap, 0, 0);
graphicsMap.Dispose();
graphics.Dispose();
}
public override void OnMouseWheel(ICoordinate mouseWorldPosition, MouseEventArgs e)
{
// zoom map
double scale = (-e.Delta / 250.0);
double scaleBase = 1 + wheelZoomMagnitude;
// fine zoom if alt is pressed
if (IsAltPressed)
{
scale = (-e.Delta / 500.0);
}
double zoomFactor = scale > 0 ? scaleBase : 1 / scaleBase;
Map.Zoom *= zoomFactor;
//determine center coordinate in world units
double newCenterX = mouseWorldPosition.X - Map.PixelWidth * (e.X - MapControl.Width / 2.0);
double newCenterY = mouseWorldPosition.Y - Map.PixelHeight * (MapControl.Height / 2.0 - e.Y);
// use current map center if shift is pressed
Map.Center = new Coordinate(newCenterX, newCenterY);
// draw zoom rectangle (in screen coordinates)
Rectangle zoomRectangle = new Rectangle(
(int)(e.X * (1 - zoomFactor)),
(int)(e.Y * (1 - zoomFactor)),
(int)(MapControl.Size.Width * zoomFactor),
(int)(MapControl.Size.Height * zoomFactor));
// draw image and clear background in a separate image first to prevent flickering
Bitmap previewImage = (Bitmap)Map.Image.Clone();
Graphics g = Graphics.FromImage(previewImage);
g.Clear(MapControl.BackColor);
g.DrawImage(Map.Image, MapControl.ClientRectangle, zoomRectangle, GraphicsUnit.Pixel);
// make tools to draw themself while map is being rendered
foreach (IMapTool tool in MapControl.Tools)
{
if (tool.IsActive)
{
tool.OnPaint(new PaintEventArgs(g, MapControl.ClientRectangle));
}
}
g.Dispose();
// now draw preview image on control
g = MapControl.CreateGraphics();
g.DrawImage(previewImage, 0, 0);
g.Dispose();
previewImage.Dispose();
// call full map rendering (long operation)
MapControl.Refresh();
}
public override void OnMouseMove(ICoordinate worldPosition, MouseEventArgs e)
{
if (!zooming)
{
return;
}
endDragPoint = e.Location;
// draw image and clear background in a separate image first to prevent flickering
Graphics g = Graphics.FromImage(previewImage);
g.Clear(MapControl.BackColor);
g.DrawImage(Map.Image, 0, 0);
GraphicsHelper.DrawSelectionRectangle(g, Color.DeepSkyBlue, startDragPoint, endDragPoint);
g.Dispose();
// now draw it on control
g = MapControl.CreateGraphics();
g.DrawImage(previewImage, 0, 0);
g.Dispose();
}
public override void OnMouseMove(ICoordinate worldPosition, MouseEventArgs e)
{
if (!Dragging)
{
if (IsCtrlAndAltPressed)
{
StartDrag(e.Location);
}
return;
}
// in case key events get lost: stop dragging if no longer mouse / keyboard down
if (!IsCtrlAndAltPressed && e.Button != MouseButtons.Middle)
{
StopDrag();
return;
}
MapControl.Cursor = Cursors.Hand;
DragEndPoint = e.Location;
var point = new Point((DragEndPoint.X - DragStartPoint.X),
(DragEndPoint.Y - DragStartPoint.Y));
using (var previewImage = new Bitmap(DragImage.Width, DragImage.Height))
{
using (var g = Graphics.FromImage(previewImage))
{
g.Clear(MapControl.BackColor);
g.DrawImageUnscaled(DragImage, point);
g.DrawImageUnscaled(StaticToolsImage, 0, 0);
}
using (var g = MapControl.CreateGraphics())
{
g.DrawImage(previewImage, 0, 0);
}
}
}
public override void OnMouseWheel(ICoordinate mouseWorldPosition, MouseEventArgs e)
{
if (Dragging)
{
return;
}
// zoom map
double scale = (-e.Delta / 250.0);
double usedWheelZoomMagnutide = wheelZoomMagnitude;
// fine zoom if alt is pressed
if (IsAltPressed)
{
usedWheelZoomMagnutide = wheelZoomMagnitude / 8;
}
double scaleBase = 1 + usedWheelZoomMagnutide;
double zoomFactor = scale > 0 ? scaleBase : 1 / scaleBase;
Map.Zoom *= zoomFactor;
Rectangle zoomRectangle;
if (!IsShiftPressed)
{
//determine center coordinate in world units
double newCenterX = mouseWorldPosition.X - Map.PixelWidth * (e.X - MapControl.Width / 2.0);
double newCenterY = mouseWorldPosition.Y - Map.PixelHeight * (MapControl.Height / 2.0 - e.Y);
// use current map center if shift is pressed
Map.Center = new Coordinate(newCenterX, newCenterY);
// draw zoom rectangle (in screen coordinates)
zoomRectangle = new Rectangle(
(int)(e.X * (1 - zoomFactor)),
(int)(e.Y * (1 - zoomFactor)),
(int)(MapControl.Size.Width * zoomFactor),
(int)(MapControl.Size.Height * zoomFactor));
}
else
{
// draw zoom rectangle (in screen coordinates)
zoomRectangle = new Rectangle(
(int)(MapControl.Width / 2.0 * (1 - zoomFactor)),
(int)(MapControl.Height / 2.0 * (1 - zoomFactor)),
(int)(MapControl.Size.Width * zoomFactor),
(int)(MapControl.Size.Height * zoomFactor));
}
// draw image and clear background in a separate image first to prevent flickering
using (var previewImage = (Bitmap)Map.Image.Clone())
{
using (var g = Graphics.FromImage(previewImage))
{
g.Clear(MapControl.BackColor);
g.DrawImage(Map.Image, MapControl.ClientRectangle, zoomRectangle, GraphicsUnit.Pixel);
DrawStaticTools(g); // make tools to draw themself while map is being rendered
}
// now draw preview image on control
using (var g = MapControl.CreateGraphics())
{
g.DrawImage(previewImage, 0, 0);
}
}
// call full map rendering (long operation)
MapControl.Refresh();
}
