private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "Shapefile文件|*.shp";
openFileDialog.RestoreDirectory = true;
openFileDialog.FilterIndex = 1;
openFileDialog.Multiselect = false;
if (openFileDialog.ShowDialog() != DialogResult.OK)
{
return;
}
layer = GISShapefile.ReadShapefile(openFileDialog.FileName);
layer.DrawAttributeOrNot = false;
MessageBox.Show("read " + layer.FeatureCount() + "objects");
view.UpdateExtent(layer.Extent);
UpdateMap();
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
if (document.IsEmpty())
{
return;
}
if (MouseOnMap == false)
{
return;
}
MouseOnMap = false;
switch (MouseCommand)
{
case MOUSECOMMAND.Select:
//如果CTRL没被按住，就清空选择集 按住CTRL键表示选择多个 即向选择集中新增空间对象
if (Control.ModifierKeys != Keys.Control)
{
document.ClearSelection();
}
//初始化选择结果
SelectResult sr = SelectResult.UnknownType;
if (e.X == MouseStartX && e.Y == MouseStartY)
{
//点选
GISVertex v = view.ToMapVertex(e.Location);
sr = document.Select(v, view);
}
else
{
//框选
GISExtent extent = view.Rect2Extent(e.X, MouseStartX, e.Y, MouseStartY);
sr = document.Select(extent);
}
if (sr == SelectResult.OK || Control.ModifierKeys != Keys.Control)
{
UpdateMap();
UpdateAttributeWindow();
}
break;
case MOUSECOMMAND.Zoomin:
if (e.X == MouseStartX && e.Y == MouseStartY)
{
//单点放大
GISVertex MouseLocation = view.ToMapVertex(e.Location);
GISExtent E1 = view.getRealExtent();
double newwidth = E1.getWidth() * GISConst.ZoominFactor;
double newheight = E1.getHeight() * GISConst.ZoominFactor;
double newminx = MouseLocation.x - (MouseLocation.x - E1.getMinX()) * GISConst.ZoominFactor;
double newminy = MouseLocation.y - (MouseLocation.y - E1.getMinY()) * GISConst.ZoominFactor;
view.UpdateExtent(new GISExtent(newminx, newminx + newwidth, newminy, newminy + newheight));
}
else
{
//拉框放大
view.UpdateExtent(view.Rect2Extent(e.X, MouseStartX, e.Y, MouseStartY));
}
UpdateMap();
break;
case MOUSECOMMAND.Zoomout:
if (e.X == MouseStartX && e.Y == MouseStartY)
{
//单点缩小
GISExtent e1 = view.getRealExtent();
GISVertex mouselocation = view.ToMapVertex(e.Location);
double newwidth = e1.getWidth() / GISConst.ZoomoutFactor;
double newheight = e1.getHeight() / GISConst.ZoomoutFactor;
double newminx = mouselocation.x - (mouselocation.x - e1.getMinX()) / GISConst.ZoomoutFactor;
double newminy = mouselocation.y - (mouselocation.y - e1.getMinY()) / GISConst.ZoomoutFactor;
view.UpdateExtent(new GISExtent(newminx, newminx + newwidth, newminy, newminy + newheight));
}
else
{
//拉框缩小
GISExtent e3 = view.Rect2Extent(e.X, MouseStartX, e.Y, MouseStartY);
GISExtent e1 = view.getRealExtent();
double newwidth = e1.getWidth() * e1.getWidth() / e3.getWidth();
double newheight = e1.getHeight() * e1.getHeight() / e3.getHeight();
double newminx = e3.getMinX() - (e3.getMinX() - e1.getMinX()) * newwidth / e1.getWidth();
double newminy = e3.getMinY() - (e3.getMinY() - e1.getMinY()) * newheight / e1.getHeight();
view.UpdateExtent(new GISExtent(newminx, newminx + newwidth, newminy, newminy + newheight));
}
UpdateMap();
break;
case MOUSECOMMAND.Pan:
if (e.X != MouseStartX && e.Y != MouseStartY)
{
GISExtent e1 = view.getRealExtent();
GISVertex m1 = view.ToMapVertex(new Point(MouseStartX, MouseStartY));
GISVertex m2 = view.ToMapVertex(e.Location);
double newwidth = e1.getWidth();
double newheight = e1.getHeight();
double newminx = e1.getMinX() - (m2.x - m1.x);
double newminy = e1.getMinY() - (m2.y - m1.y);
view.UpdateExtent(new GISExtent(newminx, newminx + newwidth, newminy, newminy + newheight));
UpdateMap();
}
break;
}
}
private void button2_Click(object sender, EventArgs e)
{
view.UpdateExtent(layer.Extent);
UpdateMap();
}