public Point ToScreenPoint(GISVertex onevertex)//地图点到屏幕点转换
{
double ScreenX = (onevertex.x - MapMinX) / ScaleX;
double ScreenY = WinH - (onevertex.y - MapMinY) / ScaleY;
return(new Point((int)ScreenX, (int)ScreenY));
}
//定义两个矢量运算 点积和叉积
static double Dot3Product(GISVertex A, GISVertex B, GISVertex C)
{
GISVertex AB = new GISVertex(B.x - A.x, B.y - A.y);//矢量也可以通过vertex来记录
GISVertex BC = new GISVertex(C.x - B.x, C.y - B.y);
return(AB.x * BC.x + AB.y * BC.y);
}
static double Cross3Product(GISVertex A, GISVertex B, GISVertex C)
{
GISVertex AB = new GISVertex(B.x - A.x, B.y - A.y);//矢量也可以通过vertex来记录
GISVertex AC = new GISVertex(C.x - A.x, C.y - A.y);
return(VectorProduct(AB, AC));
}
public void draw(Graphics graphics, GISView view, GISVertex location, int index)
{
Point screenpoint = view.ToScreenPoint(location);//转换坐标到屏幕点
graphics.DrawString(values[index].ToString(),
new Font("宋体", 20),
new SolidBrush(Color.Green),
new PointF(screenpoint.X, screenpoint.Y));
}
//计算屏幕距离函数
public double ToScreenDistance(GISVertex v1, GISVertex v2)
{
Point p1 = ToScreenPoint(v1);
Point p2 = ToScreenPoint(v2);
double ScreenDistance = Math.Sqrt((double)((p1.X - p2.X) * (p1.X - p2.X) + (p1.Y - p2.Y) * (p1.Y - p2.Y)));
Console.WriteLine("ScreenDistance is " + ScreenDistance.ToString());
return(ScreenDistance);
}
//根据鼠标点和距离阈值构造点选范围extent
public GISExtent BuildExtent(GISVertex vertex, GISView view)
{
Point p0 = view.ToScreenPoint(vertex);
Point p1 = new Point(p0.X + (int)GISConst.MinScreenDistance, p0.Y + (int)GISConst.MinScreenDistance);
Point p2 = new Point(p0.X - (int)GISConst.MinScreenDistance, p0.Y - (int)GISConst.MinScreenDistance);
GISVertex gmp1 = view.ToMapVertex(p1);
GISVertex gmp2 = view.ToMapVertex(p2);
return(new GISExtent(gmp1.x, gmp2.x, gmp1.y, gmp2.y));
}
//点到线实体的距离计算 //可以算出最短的距离 但无法获知最近的位置
public double Distance(GISVertex vertex)
{
double distance = Double.MaxValue;
for (int i = 0; i < Vertexes.Count - 1; i++)
{
distance = Math.Min(GISTools.PointToSegment
(Vertexes[i], Vertexes[i + 1], vertex), distance);
}
return(distance);
}
private void BtchangeEsymbol_Click(object sender, EventArgs e)
{
int symbolsize = Convert.ToInt32(tbsymbolsize.Text);
int cls = Convert.ToInt32(tbclass.Text);
Color symbolcolor = btsymbolfillcolor.BackColor;
List <int> sizes = layer.getSymbolSize(cbattributeEsymbol.SelectedIndex, symbolsize, cls);
//新建一个esymbollayer，在点密度中的点将以一个点图层的形式显示出来
GISLayer esymbollayer = new GISLayer("Esymbol", SHAPETYPE.point, layer.Extent);
esymbollayer.Selectable = false; //设置为不可选择
esymbollayer.ThematicType = THEMATICTYPE.EqualSymbol; //设置为等比变换型专题地图
//为esymbollayer中每一个对象设置一个thematic
for (int i = 0; i < layer.Features.Count; i++)
{
esymbollayer.Thematics.Add(i, new GISThematic(Color.Black, sizes[i], symbolcolor));
Console.WriteLine(sizes[i]);
}
//创建symbols点对象，作为esymbollayer的features
//默认将符号放于polygon的重心位置
List <GISFeature> symbols = new List <GISFeature>();
for (int i = 0; i < layer.Features.Count; i++)
{
GISPolygon polygon = (GISPolygon)layer.Features[i].spatialpart;
GISVertex vertex = new GISVertex(polygon.centroid);
symbols.Add(new GISFeature(new GISPoint(vertex), null));
}
esymbollayer.Features = symbols;
//先移除之前已有的点密度图层
for (int i = Document.layers.Count - 1; i > 0; i--)
{
if (Document.layers[i].Name == "Esymbol")
{
Document.layers.RemoveAt(i);
}
}
Document.layers.Add(esymbollayer);//将esymbollayer添加到document中 在更新地图绘制时会自动绘制layers里面的所有图层
//更新地图绘制
if (sender.Equals(previewes))
{
PreviewWindow.UpdateMap();
}
else if (sender.Equals(btchangeEsymbol))
{
Mapwindow.UpdateMap();
}
}
public Point ToScreenPoint(GISVertex onevertex)//地图点到屏幕点转换
{
if (Form1.IsMercator)
{
double ScreenX = (onevertex.mercatorx - MapMinX) / ScaleX;
double ScreenY = WinH - (onevertex.mercatory - MapMinY) / ScaleY;
Console.WriteLine(ScreenX.ToString() + ScreenY.ToString());
return(new Point((int)ScreenX, (int)ScreenY));
}
else
{
double ScreenX = (onevertex.x - MapMinX) / ScaleX;
double ScreenY = WinH - (onevertex.y - MapMinY) / ScaleY;
return(new Point((int)ScreenX, (int)ScreenY));
}
}
public SelectResult SelectPoint(GISVertex vertex, List <GISFeature> features,
GISView view, GISExtent MinSelectExtent)
{
Double distance = Double.MaxValue;
int id = -1;
for (int i = 0; i < features.Count; i++) //找最近的feature判断是否有效
{
if (MinSelectExtent.IntersectOrNot(features[i].spatialpart.extent) == false)
{
continue;
}
GISPoint point = (GISPoint)(features[i].spatialpart);
double dist = point.Distance(vertex);
if (dist < distance)//每次找到最小的距离并记录id号
{
distance = dist;
id = i;
}
}
Console.WriteLine("id:" + id.ToString()); //测试id是否存在
Console.WriteLine(features[id].spatialpart.centroid.x.ToString() + "|" + features[id].spatialpart.centroid.y.ToString());
Console.WriteLine("鼠标点到元素点在地图上相距" + distance.ToString()); //此处的distance是features中最近的元素点到鼠标点映射到地图上点的距离
//精选
if (id == -1) //经过遍历 没有与minsextent相交的点则跳出
{
SelectedFeature = null;
return(SelectResult.TooFar);
}
else
{
double screendistance = view.ToScreenDistance(vertex, features[id].spatialpart.centroid);
//Console.WriteLine(screendistance);
if (screendistance < GISConst.MinScreenDistance)
{
SelectedFeature = features[id];
return(SelectResult.OK);
}
else
{
SelectedFeature = null;
return(SelectResult.TooFar);//即使在粗选相交 精选距离也超过了限制 则返回
}
}
}
public static double PointToSegment(GISVertex A, GISVertex B, GISVertex C)
{
double dot1 = Dot3Product(A, B, C);
if (dot1 > 0)
{
return(B.Distance(C));
}
double dot2 = Dot3Product(B, A, C);
if (dot2 > 0)
{
return(A.Distance(C));
}
double dist = Cross3Product(A, B, C) / A.Distance(B);
return(Math.Abs(dist));
}
public SelectResult SelectLine(GISVertex vertex, List <GISFeature> features,
GISView view, GISExtent MinSelectExtent)
{
Double distance = Double.MaxValue;
int id = -1;
for (int i = 0; i < features.Count; i++) //找最近的feature判断是否有效
{
if (MinSelectExtent.IntersectOrNot(features[i].spatialpart.extent) == false)
{
continue;
}
GISLine line = (GISLine)(features[i].spatialpart);
double dist = line.Distance(vertex);
//Console.WriteLine("dist:" + dist);
if (dist < distance)//每次找到最小的距离并记录id号
{
distance = dist;
id = i;
}
}
Console.WriteLine("id:" + id.ToString());//测试id是否存在
//Console.WriteLine(distance);
//精选
if (id == -1)//经过遍历 没有与minsextent相交的点则跳出
{
SelectedFeature = null;
return(SelectResult.TooFar);
}
else
{
double screendistance = view.ToScreenDistance(distance);
if (screendistance < GISConst.MinScreenDistance)
{
SelectedFeature = features[id];
return(SelectResult.OK);
}
else
{
SelectedFeature = null;
return(SelectResult.TooFar);//即使在粗选相交 精选距离也超过了限制 则返回
}
}
}
public SelectResult Select(GISVertex vertex, List <GISFeature> features, SHAPETYPE shapetype, GISView view)
{
if (features.Count == 0)
{
return(SelectResult.EmptySet);
}
GISExtent MinSelectExtent = BuildExtent(vertex, view);//建立最小选择范围
switch (shapetype)
{
case SHAPETYPE.point:
Console.WriteLine("point");
return(SelectPoint(vertex, features, view, MinSelectExtent));
case SHAPETYPE.line:
Console.WriteLine("line");
return(SelectLine(vertex, features, view, MinSelectExtent));
case SHAPETYPE.polygon:
Console.WriteLine("polygon");
return(SelectPolygon(vertex, features, view, MinSelectExtent));
}
return(SelectResult.UnknownType);
}
public double Distance(GISVertex anothervertex)
{
return(Location.Distance(anothervertex));
}
public double Distance(GISVertex anothervertex)
{
return(Math.Sqrt((x - anothervertex.x) * (x - anothervertex.x)
- (y - anothervertex.y) * (y - anothervertex.y)));
}
public GISExtent(double x1, double x2, double y1, double y2)
{
upright = new GISVertex(Math.Max(x1, x2), Math.Max(y1, y2));
bottomleft = new GISVertex(Math.Min(x1, x2), Math.Min(y1, y2));
}
public GISVertex upright; //外接矩形的左下和右上角的节点
public GISExtent(GISVertex _bottomleft, GISVertex _upright)
{
bottomleft = _bottomleft;
upright = _upright;
}
public void CopyFrom(GISVertex v)
{
x = v.x;
y = v.y;
}
public void draw(Graphics graphics, GISVertex location, int index)
{
graphics.DrawString(values[index].ToString(), new Font("宋体", 20),
new SolidBrush(Color.Green), new PointF((int)(location.x), (int)(location.y)));
}
private void GISPanel_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;
}
}
public GISPoint(GISVertex onevertex, string onestring)
{
Location = onevertex;
Attribute = onestring;
}
//public GISVertex Location; **previous code
//public string Attribute;
public GISPoint(GISVertex onevertex)
{
centroid = onevertex;
extent = new GISExtent(onevertex, onevertex);
}
public static double VectorProduct(GISVertex v1, GISVertex v2)
{
return(v1.x * v2.y - v1.y * v2.x);
}
public double Distance(GISVertex anothervertex)
{
return(centroid.Distance(anothervertex));
}
public SelectResult SelectPolygon(GISVertex vertex, List <GISFeature> features,
GISView view, GISExtent MinSelectExtent)
{
return(SelectResult.TooFar);
}
