CN103390369B - A kind of map rendering intent and system - Google Patents
A kind of map rendering intent and system Download PDFInfo
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- CN103390369B CN103390369B CN201310026386.9A CN201310026386A CN103390369B CN 103390369 B CN103390369 B CN 103390369B CN 201310026386 A CN201310026386 A CN 201310026386A CN 103390369 B CN103390369 B CN 103390369B
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- 238000009877 rendering Methods 0.000 title claims abstract description 67
- 238000006243 chemical reaction Methods 0.000 claims abstract description 54
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Abstract
The invention discloses a kind of map rendering intent and system.Wherein the method comprises: rendering device obtains the Vector spatial data after conversion from described iteration means, and the Vector spatial data after described conversion obtains after being converted Vector spatial data according to the conversion parameter pre-set by described iteration means; Described rendering device carries out color applying drawing to the Vector spatial data after conversion, until the data render in described iteration means is drawn complete, obtains the map of color applying drawing.The present invention unifies conversion by iteration means to Vector spatial data, reduces the interim medium object in conversion, and saved the frequent memory cost creating basic drawing instrument in drawing, that improves Vector spatial data plays up drawing efficiency.
Description
Technical field
The present invention relates to Geographic Information System (GeographicInformationSystem, GIS) technical field, particularly relate to a kind of map rendering intent and system.
Background technology
Vector spatial data is the data for describing about the position of spatial entities, shape and mutual relationship, usually store with the form of coordinate and topological relation, this kind of data are significant data sources of Geographic Information System, are also the application foundations of Geographic Information System.In order to the understanding of vivid science utilizes Vector spatial data, utilize computing machine to convert vector data, final with crossing symbolism, to play up people can observable electronic chart be the necessary means of Current GIS.
Along with the improvement of space data collection means and the raising of data precision, data volume is in continuous increase, and the real-time rendering of spatial data also becomes the active demand of people, therefore how to carry out the performance that drawing is played up in Cartographic Symbolization and raising fast, day by day become important in the application of GIS.
In order to play up drawing to vector data, the usual Geometry(spatial data of GIS software), Project(projective transformation), Viewer(coordinate transform), DisplayStyle(Show Styles), Graphics(drawing instrument) etc. module process, specific practice is: first get out the vector data needing to draw, carry out suitable projective transformation, then the conversion that planimetric coordinates is tied to displaing coordinate system is carried out, then select Show Styles and rendering tool is set, create the rendering style etc. to play up, finally rendering result is presented in map window, there is provided visual electronic chart as the basis of application.
Carry out playing up drawing according to existing technical scheme, its shortcoming is mainly manifested in:
1, need before rendering prepare a large amount of Vector spatial datas and carry out projective transformation etc., the temporary object of a large amount of consumption internal memories can be produced, simultaneously needing repeatedly to carry out coordinate transform in for drafting vector space process, owing to drawing the restriction of flow process, cannot combined transformation formula etc.;
2, for Vector spatial data object, the conversion all will carrying out pattern and drawing instrument of drawing each time, and create frequently and delete drawing instrument, cause and play up degraded performance.
Summary of the invention
Play up need to prepare mass data to solve map in prior art, consume the large technical matters of amount of ram, the present invention proposes a kind of map rendering intent and system.
One aspect of the present invention, provides a kind of map rendering intent, it is characterized in that, comprising:
Rendering device obtains the Vector spatial data after conversion from described iteration means, and the Vector spatial data after described conversion obtains after being converted Vector spatial data according to the conversion parameter pre-set by described iteration means;
Described rendering device carries out color applying drawing to the Vector spatial data after conversion, until the data render in described iteration means is drawn complete, obtains the map of color applying drawing.
Wherein, convert parameter to comprise: projective transformation parameter and plane coordinate transformation parameter;
Vector spatial data after described conversion carries out projective transformation by described iteration means according to described projective transformation parameter, and obtain after the Vector spatial data after projective transformation is carried out plane coordinate transformation according to described plane coordinate transformation parameter.
Wherein, also comprise before the Vector spatial data after rendering device obtains conversion from described iteration means:
Obtain map denotation pattern;
Map rendering parameter according to described map denotation style setting;
Described rendering device carries out color applying drawing to the Vector spatial data after conversion and comprises:
Described rendering device carries out color applying drawing according to described map rendering parameter to the Vector spatial data after conversion.
The method also comprises: display device shows the map of described color applying drawing according to described map denotation pattern.
Another aspect of the present invention, provides a kind of map rendering system, comprising: rendering device and iteration means;
Described iteration means, obtains the Vector spatial data after converting after converting Vector spatial data according to the conversion parameter pre-set;
Rendering device, for obtaining the Vector spatial data after conversion from described iteration means, carries out color applying drawing to the Vector spatial data after conversion, until the data render in described iteration means is drawn complete, obtains the map of color applying drawing.
Wherein, rendering device, also for obtaining map denotation pattern; Map rendering parameter according to described map denotation style setting; According to described map rendering parameter, color applying drawing is carried out to the Vector spatial data after conversion.
This system also comprises: display device, for showing the map of described color applying drawing according to described map denotation pattern.
Map rendering intent of the present invention and system, by iteration means, conversion is unified to Vector spatial data, reduce the interim medium object in conversion, saved the frequent memory cost creating basic drawing instrument in drawing, that improves Vector spatial data plays up drawing efficiency.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of map rendering intent embodiment of the present invention;
Fig. 2 is the process flow diagram of another embodiment of map rendering intent of the present invention;
Fig. 3 is the structural drawing of map rendering system embodiment of the present invention.
Embodiment
Generally, conventional the rendering style for Vector spatial data comprises single pattern, classification pattern, classification pattern etc., for each class color applying drawing, basic drawing instrument is constant, what change is only volume coordinate and part pictorial information, based on this prerequisite, the present invention propose Vector spatial data postpone obtain play up drawing concept, namely by a kind of spatial object iteration means of structure, do not need when drawing and starting to prepare Vector spatial data, only using iteration means and relevant pictorial information as Parameter transfer graphics module, it is good after drawing instrument prepares, from iteration means, final drawing coordinate and pictorial information is obtained by the conversion parameter preset, repeat this process and complete playing up at drawing instrument in real time, finally color applying drawing is presented at map window.Below in conjunction with accompanying drawing, the present invention is described in detail.
As shown in Figure 1, map rendering intent embodiment of the present invention comprises:
Step 102, iteration means converts Vector spatial data according to the conversion parameter pre-set;
Step 104, rendering device obtains the Vector spatial data after conversion from iteration means;
Step 106, rendering device carries out color applying drawing to the Vector spatial data after conversion, until the data render in iteration means is drawn complete, obtains the map of color applying drawing.
Wherein, convert parameter to comprise: projective transformation parameter and plane coordinate transformation parameter.Iteration means carries out projective transformation according to projective transformation parameter, and obtain after the Vector spatial data after projective transformation is carried out plane coordinate transformation according to plane coordinate transformation parameter.
Also comprise before step 102: rendering device obtains map denotation pattern; Rendering device is map rendering parameter according to described map denotation style setting.
In step 106, rendering device carries out color applying drawing according to described map rendering parameter to the Vector spatial data after conversion.
Also comprise after step 106: display device according to the map Show Styles shows the map of described color applying drawing.
As shown in Figure 2, the specific implementation flow process of map rendering intent of the present invention is as follows:
Step 202, input space data metadata information and Show Styles etc., be all designed to layer Layer and pattern Style in general GIS software;
A VectorLayer is opened by layer name:
GLayerlayer=OpenFeatureLayer(layerName);
The display style information defined as required creates Show Styles object:
GStylestyle=CreateStyle(styleInfo);
Step 204, creates an iteration means according to layer Layer, creates rendering device according to pattern Style;
Iteration means (GeometryIterator) is defined as follows:
classGeometryIterator{
GeometryIterator (GLayerlayer ...); // constructed fuction
BoolNext (Geometryg, voidinfo ...); // obtain next vector data object
BoolSetTransform (GTransformxx ...); // all kinds of transforming object is set
};
With layer object for data source constructs iteration means:
GeometryIteratorgi=newGeometryIterator(layer，......);
According to Show Styles structure rendering device:
GraphicsDevicegd=newGraphicsDevice(style，…….);
Step 206, arranges the aid such as paintbrush paintbrush needed for the coordinate system of rendering device and initialization, arranges the projection and coordinate conversion parameter etc. of iteration means simultaneously, and combined transformation matrix;
gd.CreateBrushAndPen(……);
gi.SetTransform(x，……);
Gd.Draw (gi ...); // utilize the drafting function call entrance of iteration means
Step 208, iteration means carries out the conversion of space vector data according to projection and coordinate conversion parameter;
Step 210, rendering device takes out the Vector spatial data after conversion from iteration means;
Geometryg;
Gi.Next (g, info ...); // from iteration means, take out the rendered object of next spatial entities, if success, then carry out step 210, if failure, then end loop, carry out step 214;
Step 212, rendering device carries out color applying drawing;
gd.graphics.Draw(g,pen,brush，…….);
Step 214, judges whether the data in iteration means draw complete; If so, perform step 216, if not, perform step 210;
Step 216, release rendering objects etc., are presented in map window by the result played up;
gi.Release();
gd.Release();
style.Release();
layer.Release()。
As shown in Figure 3, the present invention also provides a kind of map rendering system embodiment to comprise: rendering device 32 and iteration means 31.Iteration means 31, obtains the Vector spatial data after converting according to the conversion parameter pre-set to Vector spatial data after converting.Rendering device 32, obtains the Vector spatial data after conversion from described iteration means, carries out color applying drawing to the Vector spatial data after conversion, until the data render in described iteration means is drawn complete, obtains the map of color applying drawing.
Wherein, rendering device also obtains map denotation pattern; Map rendering parameter according to described map denotation style setting; According to described map rendering parameter, color applying drawing is carried out to the Vector spatial data after conversion.
This system also comprises: display device 33, shows the map of described color applying drawing according to described map denotation pattern.
Invention creates the iteration means for postponing to obtain spatial data, it can be used as diagram parameter to pass to drawing instrument, instead of directly transmit spatial data object to drawing instrument.Reduce the interim medium object in conversion by unified for conversion between projective transformation and plotting planes coordinate system in iteration means, in drafting action, directly spatial data can be transformed to drawing coordinate used of drawing like this.
Map rendering intent of the present invention and system, by iteration means, conversion is unified to Vector spatial data, reduce the interim medium object in conversion, saved the frequent memory cost creating basic drawing instrument in drawing, that improves Vector spatial data plays up drawing efficiency.
It is noted that above embodiment is only in order to illustrate the present invention and unrestricted, the present invention is also not limited in above-mentioned citing, and all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in right of the present invention.
Claims (6)
1. a map rendering intent, is characterized in that, comprising:
Rendering device obtains the Vector spatial data after conversion from iteration means, Vector spatial data after described conversion obtains after being converted Vector spatial data according to the conversion parameter pre-set by described iteration means, and described conversion parameter comprises: projective transformation parameter and plane coordinate transformation parameter;
Described rendering device carries out color applying drawing to the Vector spatial data after conversion, until the data render in described iteration means is drawn complete, obtains the map of color applying drawing;
Vector spatial data after described conversion carries out projective transformation by described iteration means according to described projective transformation parameter, and obtain after the Vector spatial data after projective transformation is carried out plane coordinate transformation according to described plane coordinate transformation parameter.
2. method according to claim 1, is characterized in that, also comprises before the Vector spatial data after rendering device obtains conversion from described iteration means:
Obtain map denotation pattern;
According to described map denotation style setting map rendering parameter;
Described rendering device carries out color applying drawing to the Vector spatial data after conversion and comprises:
Described rendering device carries out color applying drawing according to described map rendering parameter to the Vector spatial data after conversion.
3. method according to claim 2, is characterized in that, also comprises: display device shows the map of described color applying drawing according to described map denotation pattern.
4. a map rendering system, is characterized in that, comprising: rendering device and iteration means;
Described iteration means, after converting Vector spatial data according to the conversion parameter pre-set, obtain the Vector spatial data after converting, described conversion parameter comprises: projective transformation parameter and plane coordinate transformation parameter;
Rendering device, for obtaining the Vector spatial data after conversion from described iteration means, carries out color applying drawing to the Vector spatial data after conversion, until the data render in described iteration means is drawn complete, obtains the map of color applying drawing;
Vector spatial data after described conversion carries out projective transformation by described iteration means according to described projective transformation parameter, and obtain after the Vector spatial data after projective transformation is carried out plane coordinate transformation according to described plane coordinate transformation parameter.
5. system according to claim 4, is characterized in that, described rendering device, also for obtaining map denotation pattern; According to described map denotation style setting map rendering parameter; According to described map rendering parameter, color applying drawing is carried out to the Vector spatial data after conversion.
6. system according to claim 5, is characterized in that, also comprises: display device, for showing the map of described color applying drawing according to described map denotation pattern.
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| CN103035164B (en) * | 2012-12-24 | 2015-03-25 | 广东威创视讯科技股份有限公司 | Rendering method and system of geographic information system |
| CN103903289B (en) * | 2014-04-02 | 2015-03-04 | 中国地质大学（武汉） | Stochastic pattern wetland pattern generating method based on fractal generator |
| CN108572816A (en) * | 2018-04-17 | 2018-09-25 | 国网上海市电力公司 | A method of input parameter is visualized and is projected to map |
| CN112783385A (en) * | 2021-01-04 | 2021-05-11 | 河北志晟信息技术股份有限公司 | Dynamic generation method of environment-friendly monitoring map point location identification |
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