CN103824255B - Method for controlling map scaling through mouse wheel based on Sharpmap - Google Patents
Method for controlling map scaling through mouse wheel based on Sharpmap Download PDFInfo
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Abstract
The invention relates to a method for controlling map scaling through a mouse wheel based on a Sharpmap. The method comprises the steps that firstly, a Sharpmap library function is called to load a map to obtain Envelope of the current field of view; then a mouse wheel event is established to obtain a current screen position coordinate of a mouse cursor, and a Sharpmap coordinate transfer function is called to transfer the screen position coordinate into a geographical coordinate of the Sharpmap; then a scaling range of every time mouse rolling is determined and put into an idler wheel scaling formula to obtain a new field of view of the map; finally the Sharpmap library function is called to zoom the map into the new field of view to complete the scaling of the map. The method for controlling the map scaling through the mouse wheel based on the Sharpmap is simple, and fills up the blank that the Sharpmap lacks of mouse wheel scaling innovatively based on human vision needs, the display functions of the Sharpmap are improved greatly, and convenience and fluency of map operation are improved.
Description
Technical field
The present invention relates to a kind of generalized information system develops map zoom technology field, it is more particularly to one kind and is based on Sharpmap
By mouse roller control map scaling methods, its algorithm principle be adapted to GIS exploitation by mouse roller control ground
The method of figure scaling.
Background technology
Currently, GIS is in exploitation of mineral resources, environmental conservation, transportation, geological disaster, health care and national defense and military
Constantly extend Deng the research in field and application, every field improves constantly to the system development demand based on GIS.At present, main flow
GIS development scheme have based on ripe business software（As ARCGIS, MapGIS etc.）Secondary development, opening based on open GIS
Send out and completely from three kinds of modes of low level development.Secondary development based on business software is expensive, system is huge, it provides
Considerably beyond the demand of general scientific research and project, there is typical Pareto Law in function, easily cause larger waste；Completely the bottom of from
Layer development technique difficulty is big, construction cycle length, relatively costly；And be based on open GIS and then have that development cost are low, cycle is short, spirit
The advantages of activity is strong, software performance good safety is strong and promotes autonomous innovation, the scientific research institution being subject to and enterprise pay attention to.
Since first open source GIS software GRASS of nineteen eighty-two, development is till now more than 350 geography of increasing income
Information system software project, such as QGIS, GeoServer, Mapserver, MapWindow, SharpMap etc..These open source projects
Cover C, the various development language such as C++, C#, Python and support Windows, multiple operating system such as Linux and MacOS, quilt
It is widely used in the GIS software exploitation of every field.Wherein, SharpMap is developed using C# based on .Net, and volume is short and small only
Have 10,000 row less than code, but cover whole basic functions of GIS, existing numerous researcheres are based on SharpMap both at home and abroad
Develop GIS-Geographic Information System, such as Chen D etc.（2010）Developing country's Water Management System of year exploitation, Gao Qijuan
（2009）Semen Tritici aestivi disease pest monitoring system, Fang Jingtao Deng exploitation（2012）Shallow layer ground-temperature energy resource data library management Deng exploitation
System and Xia Zhenglong etc.（2011）, Qi-juan Gao（2009）System Deng exploitation；These systems take full advantage of SharpMap
Spatial data management, the function that renders of query analysis and map, achieve preferable effect.
The SharpMap1.0 version based on .Net4.0 exploitation that in July, 2013 announces, on the basis of 0.9 version, enters one
The perfect support to image data for the SharpMap of step, improves the efficiency that its map renders, and extend space querying with point
The function of analysis is so that SharpMap has bigger advantage in desktop GIS and WebGIS exploitation.SharpMap was from 2006
Since birth, under the improving of countries in the world research or generalized information system developer, its performance and function are obtained for and greatly carry
Height, but show in Fundamental Geographic Information System figure layer, SharpMap existing map zoom function mainly passes through unit mouse
Left button or completed by drawing frame, carries out every time needing click tools hurdle button during map scaling and scaling amplitude can not voluntarily be controlled
System, lacks the due function of controlling map to amplify and reduce by mouse rollovers of generalized information system, brings to practical operation very big
Inconvenience.The business softwares such as ArcGIS, MapGIS, AutoCAD, all preferably achieve and control map by mouse roller
The function of scaling, but the outstanding open source GIS software such as QGIS, GeoServer and Mapserver, have does not possess this function, has
Although having this function, on map scaling, effect can not adapt to the visual demand of human eye very well, easily Mus during scaling
The skew of mark cursor place position of centre of gravity, causes difficulties in vision；And large scale business GIS software system is huge, expensive, big portion
Point function does not need in professional generalized information system.Therefore, can the map based on existing open GIS system contract in the urgent need to a kind of
Put algorithm, conveniently build and adapt to complete the method and technology body of map scaling in human eye demand by mouse rollovers
System, the system development for open GIS field provides technical support.
Content of the invention
The above-mentioned technical problem of the present invention is mainly addressed by following technical proposals：
A kind of based on Sharpmap by mouse roller control map scaling methods it is characterised in that be based on following two
Individual preliminary step：
Preliminary step 1：The given variable based on Sharpmap, be respectively：
Variable 1：Field range M that before scaling, map is located, defining M is SharpMap Map OCX in SharpMap
The Envelope of MapView；
Variable 2：Define the lower left corner apex coordinate O (x of Mo,yo) and upper right angular vertex T (xt,yt)；
Variable 3：During definition scaling, the position of cursor of mouse place map is H (xh,yh)；
Variable 4：Define the absolute distance dx away from M border up and down for the H1, dx2, dy1, dy2；
Variable 5：Field range W after definition scaling and its lower left corner and upper right angular vertex A (xa,ya) and D (xd,yd)；
Preliminary step 2, based on above-mentioned variable, builds zoom model, concrete grammar is：According to involved ground before and after scaling
The amount of attempting to change, obtains the coordinate points up and down of field range（xa,ya,xd,yd）；Described（xa,ya,xd,yd）Based on below equation：
The x being obtained by above formulaa,ya,xd,ydCoordinate figure, substitutes into BoundingBox, you can build the field of vision after scaling
Domain W, that is,：
BoundingBox W=BoundingBox(xa,ya,xd,yd)；
Based on above-mentioned two preliminary step, map scaling methods are controlled specifically to walk based on Sharpmap by mouse roller
Suddenly as follows：
Step 1, calls Sharpmap built-in function to load map, builds Mapview view area, and quote map loading function
Mapview.addlayer loads map in view area, determines maximum boundary field range Envelope of map, i.e. visual field model
Enclose M；
Step 2, builds mouse roller event and obtains the screen position coordinate at current mouse cursor place, this process is incoming
Mouse event parameter e, determine during mouse roller rolls forward to be to amplify, for reducing when rolling backward；Then call
Screen coordinate is converted to the geographical coordinate of Sharpmap map by Sharpmap Coordinate Conversion function, incoming current mouse position
Screen coordinate, and obtain the geographical coordinate H (x of current mouse positionh,yh)；
Step 3, according to the principle of constant rate between field range before and after control point to scaling up and down distance, builds
Map scales algorithm model wheelZoom；
Step 4, determines the scaling amplitude of each mouse rollovers and substitutes into roller scaling algorithmic formula, try to achieve map after scaling
New field range, specifically by H (xh,yh), O (xo,yo), T (xt,yt), reduce amplitude extent and judge that mouse roller rolls
The incoming wheelZoom function of dynamic directioin parameter e.Delta, tries to achieve the lower left corner apex coordinate A (x of field range W after scalinga,
ya) and upper right corner apex coordinate D (xd,yd)；
Step 5, calls Sharpmap built-in function to zoom to map in new field range W, completes map scaling.
Above-mentioned, map scaling methods, the concrete side of described step 3 are controlled by mouse roller based on Sharpmap
Method is：
Step 3.1, according to the outermost boundary visual field M calling the built-in function of SharpMap to obtain, by the genus up and down of M
Property calculates the control lower-left angular vertex O (x of Mo,yo) and upper right angular vertex T (xt,yt) and M width Lw, and determine and reduce width
Spend for extent=Lw/ n, n>The distance on 0 and H to M border；
Step 3.2, builds self-defined scaling algorithm model wheelZoom；This model is model described in preliminary step 2, letter
The coefficient of number is the x of current mouse position point successively, y value, the left, down, right of scaling forward view M, upper boundary values, the amplitude of scaling
With the judgment variable reducing with amplify.
Therefore, the invention has the advantages that：1. it is based on C#, carry out bottom GIS on the basis of the SharpMap that increases income and open
Send out, method is ripe, programming is simple, it is reliable to realize function-stable, can compare favourably with the correlation function of large-scale GIS software；And it is opened
Originating party formula is not limited by large-scale GIS software, greatly reduces the development cost of generalized information system；2. to adapt to the vision needs of people
Premised on, zoomed in and out based on human eye concern aiming spot relative screen principle of invariance, be adapted to various map denotation scalings
The application of programming；3. fill up SharpMap and can not carry out the blank that mouse roller controls map scaling, improve SharpMap
Map operation convenience, for the whole world, important contribution is made that based on the generalized information system developer of SharpMap；Also it is phase simultaneously
The open GIS project closed provides technological borrowing.
Brief description
Fig. 1 is field range schematic diagram before and after scaling.
Fig. 2 is method of the present invention schematic flow sheet.
Specific embodiment
Below by embodiment, and combine accompanying drawing, technical scheme is described in further detail.
Embodiment：
Below in conjunction with the accompanying drawings the present invention is described in further detail, the method for the present invention, is related to two preliminary steps,
I.e.：
First, preliminary step one, defined variable.
According to Fig. 1, during a kind of mouse roller based on SharpMap controls map to scale, involved variable is：
1. field range M that before scaling, map is located：M is SharpMap Map OCX defined in SharpMap
It is BoundingBox object in SharpMap that the Envelope of MapView, Envelope are in the nature；BoundingBox is one
Individual SharpMap defines the class of zoom area, is expressed as：BoundingBox(double minX,double minY,double
MaxX, double maxY), wherein minX, maxX, minY and maxY be control this four border of rectangle frame X direction and
The coordinate figure of y direction.As shown in Figure 1, point C（xc,yc）Center point coordinate for M, LwFor M X direction width
Degree, LhFor M in the height of y direction, then meet formula 1.
Envelope=BoundingBox(xc-Lw*0.5,yc-Lh*0.5,xc+Lw*0.5,yc+Lh*0.5）（Formula 1）
2. define the lower left corner apex coordinate O (x of Mo,yo) and upper right angular vertex T (xt,yt), determining according to SharpMap
Justice, asks for meeting formula 2.
xO=M.Left
yo=M.Bottom
xt=M.BRight （Formula 2）
yt=M.Top
3. during definition scaling, the position of cursor of mouse place map is H (xh,yh)：This position is passed through to call
Map.ImageToWorld (e.Location) function, mouse screen coordinate incoming for e.Location is switched to geographical coordinate.
4. define the absolute distance dx away from M border up and down for the H1, dx2, dy1, dy2, according to the boundary value seat of H coordinate and M
Mark, asks for formula and meets formula 3.
dx1=xh-xo
dy1=yt-yh
dx2=xt-xh（Formula 3）
dy2=yh-yo
5. field range W after definition scaling and its lower left corner and upper right angular vertex A (xa,ya) and D (xd,yd), meet formula
4.
BoundingBox W=BoundingBox(xa,ya,xd,yd) （Formula 4）
2nd, preliminary step two, build and put.
According to involved map variable before and after scaling, finally to be calculated be field range coordinate points up and down
（xa,ya,xd,yd）It is contemplated that when mouse roller rolls, it is in place that human eye map location of interest is required to meet cursor of mouse institute
Put the position being maintained in screen constant, and map amplifies with the rolling of middle button of mouse and reduces.There are Mus during being somebody's turn to do
Mark cursor position keeps constant relation to the ratio between the distance up and down of map vision scope external boundary.According to
This, this algorithm implementation is as follows.
1. the amplitude defining scaling amplitude of variation every time is xn, wherein xnFor scaling former and later two visuals field W and M in transverse axis side
To the value increasing or decreasing, meet formula 5；
xn=|xt-xd|=Lw/n（n>1）（Formula 5）
2. the principle according to scaling former and later two visuals field M and W border to mouse cursor position constant rate, before setting scaling
Three constant rate factors ε1,ε2,ε3, wherein ε1For visual field coboundary to H (xh,yh) distance and visual field right margin to H (xh,
yh) ratio of distances constant（In MIn W）、ε2For visual field coboundary to H (xh,yh) distance and the visual field left
Border is to H (xh,yh) ratio of distances constant（In MIn W）、ε3For visual field lower boundary to H (xh,yh) away from
From with visual field right margin to H (xh,yh) ratio of distances constant（In MIn W）, therefore build scaling formula
As formula 6：
(formula 6)
3. solve xa,ya,xd,yd：When map amplifies, field range W after amplification should be less than the region that M is comprised, this
When xd<xt；Contrary x when reducingd>xt, that is,By xdSubstitute into formula 6, solve：
4. the x obtaining is asked for by formula 7a,ya,xd,ydCoordinate figure, substitutes into BoundingBox, you can after building scaling
Area of visual field W.
3rd, the concrete grammar flow process of the present invention is as follows, based on above-mentioned one, 2 two preliminary steps：
2 understand with reference to the accompanying drawings, a kind of mouse roller based on SharpMap controls involved concrete in map scaling
Method flow is：
Step 1, under .NET framework, calls sharpmap dynamic link library based on C# language, builds Mapview view
Area, and quote map loading function Mapview.addlayer（ilayer,clayer）Load map in view area, determine map
Maximum boundary field range M；
Step 2, calls the mouse roller built-in function of C# _ MouseWheel (object sender, MouseEventArgs
E) build mouse roller event, incoming mouse event parameter e of this process, when determining mouse roller rolls forward（e.Delta>
0）For amplifying, when rolling backward（e.Delta<0）For reducing；
Step 3, calls sharpmap built-in function that screen coordinate is switched to geographical coordinate, the screen of incoming current mouse position
Coordinate e.Location, Mapview.Map.ImageToWorld（e.Location）Obtain the geographical coordinate of current mouse position
H(xh,yh).
Step 4, calls built-in function Map.GetExtents () of SharpMap to obtain the outermost boundary determining in the 1st step and regards
Wild M, by the attribute up and down of M（MainMapView.Map.Envelope.Bottom/.Right/.Top/.Left）Meter
Calculate the control lower-left angular vertex O (x of Mo,yo) and upper right angular vertex T (xt,yt) and M width Lw, and determine that the amplitude of reducing is
extent=Lw/ n, n>The distance on 0 and H to M border.
Step 5, builds self-defined scaling algorithmic function wheelZoom (double conx, double cony, double
Wleft, double wbuttom, double wright, double wtop, double extent, bool zoomType),
The coefficient of function is the x of current mouse position point successively, y value, the left, down, right of scaling forward view M, upper boundary values, the width of scaling
Degree and the judgment variable reducing and amplifying；
Step 6, by H (xh,yh), O (xo,yo), T (xt,yt), extent and e.Delta incoming wheelZoom function, ask
The lower left corner apex coordinate A (x of field range W after must scalinga,ya) and upper right corner apex coordinate D (xd,yd)；
Call the built-in function Map.ZoomToBox (W) of SharpMap, map is zoomed to new field range W, complete to contract
Put.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Claims (2)
1. a kind of based on Sharpmap by mouse roller control map scaling methods it is characterised in that be based on following two
Preliminary step：
Preliminary step 1：The given variable based on Sharpmap, be respectively：
Variable 1：Field range M that before scaling, map is located, defining M is SharpMap Map OCX in SharpMap
The Envelope of MapView；Envelope is the BoundingBox object in SharpMap, and BoundingBox is one
SharpMap defines the class of zoom area；
Variable 2：Define the lower left corner apex coordinate O (x of Mo,yo) and upper right angular vertex T (xt,yt)；
Variable 3：During definition scaling, the position of cursor of mouse place map is H (xh,yh)；
Variable 4：Define the absolute distance dx away from M border up and down for the H1, dx2, dy1, dy2；
Variable 5：Field range W after definition scaling and its lower left corner and upper right angular vertex A (xa,ya) and D (xd,yd)；
Preliminary step 2, based on above-mentioned variable, builds zoom model, concrete grammar is：Attempted to change according to involved ground before and after scaling
Amount, obtains the coordinate points (x up and down of field rangea,ya,xd,yd)；Described (xa,ya,xd,yd) based on following roller scaling
Algorithmic formula：
LxRepresent the length in X direction for the lower boundary of visual field M, the x obtaining by above formulaa,ya,xd,ydCoordinate figure, substitutes into
BoundingBox, wherein, you can build the area of visual field W after scaling, that is,：
BoundingBox W=BoundingBox (xa,ya,xd,yd)；
Based on above-mentioned two preliminary step, map scaling methods concrete steps are controlled such as by mouse roller based on Sharpmap
Under：
Step 1, calls Sharpmap built-in function to load map, builds Mapview view area, and quote map loading function
Mapview.addlayer loads map in view area, determines maximum boundary field range Envelope of map, i.e. visual field model
Enclose M；
Step 2, builds mouse roller event and obtains the screen position coordinate at current mouse cursor place, the incoming Mus of this process
Mark event argument e, determines during mouse roller rolls forward to be to amplify, for reducing when rolling backward；Then Sharpmap is called to sit
Screen coordinate is converted to the geographical coordinate of Sharpmap map by mark transfer function, the screen coordinate of incoming current mouse position,
And obtain the geographical coordinate H (x of current mouse positionh,yh)；
Step 3, according to the principle of constant rate between field range before and after control point to scaling up and down distance, builds map
Scaling algorithm model wheelZoom；
Step 4, determines the scaling amplitude of each mouse rollovers and substitutes into roller scaling algorithmic formula, after trying to achieve scaling, map is new
Field range, specifically by H (xh,yh), O (xo,yo), T (xt,yt), reduce amplitude extent and judge mouse roller rolling square
To parameter e.Delta incoming wheelZoom function, try to achieve the lower left corner apex coordinate A (x of field range W after scalinga,ya) and
Upper right corner apex coordinate D (xd,yd)；
Step 5, calls Sharpmap built-in function to zoom to map in new field range W, completes map scaling.
2. according to claim 1 map scaling methods are controlled by mouse roller based on Sharpmap, its feature exists
In the concrete grammar of described step 3 is：
Step 3.1, according to the outermost boundary visual field M calling the built-in function of SharpMap to obtain, by the attribute meter up and down of M
Calculate the control lower-left angular vertex O (x of Mo,yo) and upper right angular vertex T (xt,yt) and M width Lw, and determine that the amplitude of reducing is
Extent=Lw/ n, n>The distance on 0 and H to M border；
Step 3.2, builds map scaling algorithm model wheelZoom；This model is zoom model described in preliminary step 2, this mould
The primary function of type is self-defined scaling algorithmic function wheelZoom, and its incoming coefficient is current mouse position point successively
X, y value, the left, down, right of scaling forward view M, upper boundary values, the amplitude of scaling and the judgment variable reducing and amplifying.
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| CN105512136A (en) * | 2014-09-25 | 2016-04-20 | 中兴通讯股份有限公司 | Method and device for processing based on layer |
| CN104898947B (en) * | 2015-05-26 | 2017-09-12 | 中国民航大学 | A kind of method that GDI electronics map vector scaling and translation are realized based on mouse position |
| CN108170352A (en) * | 2017-11-29 | 2018-06-15 | 石化盈科信息技术有限责任公司 | A kind of Orientation on map method and system |
| CN108108481B (en) * | 2018-01-05 | 2022-06-28 | 中译语通科技股份有限公司 | Method for increasing 2D map flashing point effect and spatial information processing and analyzing system |
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| CN102902848A (en) * | 2012-09-18 | 2013-01-30 | 大连理工大学 | Three-dimensional visualization simulation method directed at boundary element analysis |
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| CN102902848A (en) * | 2012-09-18 | 2013-01-30 | 大连理工大学 | Three-dimensional visualization simulation method directed at boundary element analysis |
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