CN102789361A - Display style setting method of vector electronic map information - Google Patents

Abstract

The invention proposes a display style setting method of vector electronic map information, which belongs to the technical field of geographic information system map configuration, including checking whether the prerequisites are met, loading the map, setting the selected priority according to the type of map elements, and clicking on the map Arbitrary point, and obtain the coordinates of the point, judge whether there is a map element object in all the layers displayed on the map in the circular area with the selected point as the center and a radius of 10 pixels, and the user judges whether the selected layer is to be modified Steps such as layers of style in the present invention, the user uses the graphics library that represents the type of map elements established by himself according to the needs; and the user can set the selected priority according to the desired selection object, and can quickly and accurately select the layer where the element is located; modify the element The content of the style is rich, the user can select the appropriate style display elements more independently, and the style of the selected layer can be modified many times, and the invention improves the visual effect of the electronic map.

Description

A display style setting method for vector electronic map information

technical field

The invention belongs to the technical field of geographical information system map configuration, and in particular relates to a display style setting method of vector electronic map information.

Background technique

With the gradual improvement of digitalization in today's world, electronic maps are used in many fields of life because of their convenient and quick feature of providing people with rich geographic information. Compared with image data electronic maps, vector electronic maps have the advantages of vector scaling and high resolution, which bring more convenience to users. According to the type of vector data, electronic maps usually include point data such as capitals, provincial capital cities, and prefecture-level cities, line data such as railways, expressways, and single-line rivers, and surface data such as double-line rivers, national boundaries, provincial boundaries, and city boundaries. According to the characteristics of vector data types, data are usually superimposed from top to bottom in the order of points, lines, and planes when making electronic maps.

When using electronic maps, users often judge the types of geographic information based on the display forms of elements, and the display styles of various information have been determined when the electronic map is completed. However, in this display mode with a fixed element style, the user cannot highlight the specified element on the map according to the needs, especially when the map contains too many types of elements, it is inevitable that there will be elements with similar display styles, which makes the user distinguish the types of geographic information Produced difficulty, brought inconvenience to the user. However, the existing electronic maps generally do not support map display style setting. The patent "Navigation System and Its Display Color Setting Method" mentions that the display color of the electronic map and user interface in the navigation system can be set, but this method cannot completely solve the above problems .

Contents of the invention

Aiming at the problems existing in the prior art, the present invention proposes a method for setting the display style of vector electronic map information. First, use drawing software to generate graphic symbols representing the element style, and establish a graphic library; Information and the set selection priority to select the layer where an object is located; finally, the user judges whether to modify the layer: if not, re-select, if yes, select, control and display the layer style, so that Modify the display style of map elements; the specific steps are as follows:

Step 1: Before modifying the display style of the map layer, first check whether the prerequisites are met. The prerequisites include: whether the graphics library created by the user using drawing software to represent the element style is ready, whether the color library is loaded, Whether to establish a style setting interface, these conditions must be met before proceeding to the next step; if the graphics library is not prepared, the color library is not loaded, or the style setting interface is not set up, prepare the graphics library, load the color library, and set the style design interface accordingly. Yes, until all prerequisites are met.

Step 2: After all the prerequisites are met, load the map, and set the selected priority according to the map feature type. The general priority is point, line, and area from high to low;

Step 3: Click any point on the map and get the coordinates of the point;

Step 4: Determine whether there are map element objects in the circular area with a radius of 10 pixels centered on the point selected in Step 3 in all layers displayed on the map at the current scale: if not, return to Step 3 and re-select One point; if there is, all objects in this circular area will be arranged according to the preset priority, and a map element object closest to this point will be selected from the object with the highest priority and highlighted, when the object with the highest priority If there are multiple map feature objects closest to this point selected in the object, just choose one, and select the layer where the map feature object is located on the map.

Step 5: The user judges whether the selected layer is the layer whose style is to be modified: if not, return to step 3 and reselect a point; if so, proceed to step 6;

Step 6: Display the style setting interface, and set the element style in the layer. The element style includes shape, color, display size and display width.

Step 7: The user judges whether to confirm the style setting: if the user chooses to confirm, the map layer elements will be generated according to the style set by the user and displayed on the map; if the user is not satisfied and does not confirm, return to step 6 and continue Style the features of the selected layer.

The present invention has the advantage that:

1. The present invention proposes a method for setting the display style of vector electronic map information, and the user can use the graphic library representing the map element type established by himself according to the demand;

2. The present invention proposes a method for setting the display style of vector electronic map information. The user can set the selected priority according to the desired selection object, so as to ensure that the layer where the element is located can be quickly and accurately selected;

3. The present invention proposes a method for setting the display style of vector electronic map information. The modified element style is rich in content, including shape, color, and display size/width. Users can more independently select appropriate style display elements. Users can independently set the display style of elements to make them stand out, or set the display style of elements according to their own preferences to improve the visual effect of the electronic map.

Description of drawings

Fig. 1 is the flow chart that the present invention proposes a kind of display style setting method of vector electronic map information;

Fig. 2 is a kind of element that selects electronic map in the embodiment of the present invention;

Fig. 3 is the style setting dialog box in the embodiment of the present invention;

Fig. 4 is the element style parameter to be modified and set in the embodiment of the present invention;

Fig. 5 is the display effect of the elements after the electronic map parameters are set in the embodiment of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

The present invention proposes a method for setting the display style of vector electronic map information, as shown in Figure 1, comprising the following steps: Step 1: before modifying the display style of the map layer, first check whether the prerequisites have been met, said The prerequisites include: whether the graphics library used by the user to use drawing software to represent the element style is ready, whether the color library is loaded, and whether the style setting interface is established. These conditions must be met before the next step can be performed; Library, no color library loaded or no style setting interface set up, just prepare the graphics library, load the color library and set the style design interface accordingly, until all the prerequisites are met.

Step 2: After all the prerequisites are met, load the map, and set the selected priority according to the map feature type. The general priority is point, line, and area from high to low;

Step 3: Click any point on the map and get the coordinates of the point;

Step 4: Determine whether there are map element objects in the circular area with a radius of 10 pixels centered on the point selected in Step 3 in all layers displayed on the map at the current scale: if not, return to Step 3 and re-select One point; if there is, all objects in this circular area will be arranged according to the preset priority, and a map element object closest to this point will be selected from the object with the highest priority and highlighted, when the object with the highest priority If there are multiple map feature objects closest to this point selected in the object, just choose one, and select the layer where the map feature object is located on the map.

Step 5: The user judges whether the selected layer is the layer whose style is to be modified: if not, return to step 3 and reselect a point; if so, proceed to step 6;

Step 6: Display the style setting interface, and set the element style in the layer. The element style includes shape, color, display size and display width.

Step 7: The user judges whether to confirm the style setting: if the user chooses to confirm, the map layer elements will be generated according to the style set by the user and displayed on the map; if the user is not satisfied, return to step 6 and continue to edit the selected map. Layer elements are styled. The style of the selected layer in step 7 can be set multiple times, so that the layer can finally be displayed on the electronic map with the best style.

Example

The display style setting method of the present invention is illustrated by modifying the railway element style in the vector electronic map, which mainly includes the following steps:

Step 1: Before modifying the display style of map elements, first check whether the prerequisites are met. The conditions include: whether the graphics library created by the user using the drawing software to represent the element style is ready, whether the color library is loaded, and whether the style is established Set the interface, if all these conditions must be met, proceed to the next step, otherwise continue to prepare the corresponding prerequisites;

The graphics in the graphics library include not only general graphics, but also graphics drawn by users using drawing software, including three types of graphics: point, line, and surface. The color library is the system color library, including all colors. The content of the style setting interface includes setting elements the size/width of graphics, colors and symbols;

Step 2: After the prerequisites are met, load the map, and set the selected priority according to the map feature type; since the vector data is usually superimposed from top to bottom in the order of points, lines, and areas when making maps, the default priority is selected Point>Line>Surface, the user can also set the type of the object to be modified as the highest priority according to the needs of the use. For example, when a line element needs to be selected, the selected priority can be set to Line>Point>Surface. In this embodiment, Apply default priority;

Step 3: Click a point on the map to obtain the coordinates of the point (115°20′, 37°50′);

Step 4: Determine whether there are map feature objects in a circular area with a radius of 10 pixels centered on this point in all layers of the map: if not, execute the previous step again; if yes, delete all objects in this circular area Objects are arranged according to the preset priority. From the object with the highest priority, select a feature object closest to this point, select the layer where this object is located, and select the map feature object closest to this point from the object with the highest priority When there are more than one, just choose one, and select the layer where the map feature object is located on the map;

In this embodiment, click a point selected in step 3 on the map, and determine whether there is a selected layer by judging whether there is an object in a circular area with a radius of 10 pixels in the vicinity of the point position for each layer in the map. When an object is selected, the selected object will be highlighted on the map. As shown in Figure 2, an object in the rectangular frame is displayed on the map in a highlighted form. According to the map legend, the object displayed in the highlighted form is a railway object, which means that the railway layer is selected on the map;

Step 5: The user judges whether the selected layer is the layer whose style needs to be modified: if not, return to step 3 and reselect a point, if yes, proceed to step 6;

In this embodiment, the railway layer is the layer whose style needs to be modified;

Step 6: Display the style setting interface, set the element style in the layer, the element style includes shape, color and display size/width;

In this embodiment, the content in the style setting dialog box is the existing style of the railway element, as shown in Figure 3, the width of the railway element in the map is 1, and the black outline contains the line type of the equal-length short-line style with black and white intervals Displayed on the map; Now we want to highlight the railway on the map, so set the railway style as a straight line with a line width of 5, as shown in Figure 4;

Step 7: The user judges whether to confirm the style setting: if the user chooses to confirm, the map layer elements will be generated according to the style set by the user and displayed on the map; if the user is not satisfied, return to step 6 and continue to edit the selected map. Layer elements are styled. This is because the style setting for the selected layer elements in step 6 often cannot be set to the best style at one time.

In this embodiment, according to the preview effect of a straight line with a line width of 5 shown in Figure 4, it is considered to meet the requirements, so click "OK", the map will generate the railway style that has just been set, and the electronic map will be displayed as shown in Figure 5. All the railway features in are displayed as straight lines with a line width of 5. It can be seen that the railway features have been displayed on the map according to the set style. The invention realizes better interaction between the user and the electronic map, satisfies the user's ability to independently set the map style according to actual needs or personal preferences, and improves the map display effect to a greater extent.

Claims (5)

1. the display styles method to set up of a Vector Electronic Map information is characterized in that: comprise following step:

Step 1: whether the inspection condition precedent all possesses, all possesses like condition precedent, then carries out step 2, as all not possessing, carries out corresponding setting, all possesses until condition precedent;

Step 2: load map, the setting of key element type is selected priority according to the map;

Step 3: click on the map more arbitrarily, and obtain this point coordinate;

Step 4: the point of choosing in judging in the All Layers that map shows under current engineer's scale with step 3 is that center, radius are in the border circular areas of 10 pixels whether the map elements object to be arranged: if do not have, then return step 3, reselect a bit; If have; Then with all objects in this border circular areas by the priority arrangement that pre-sets; From the highest object of priority, choose a map elements object and the high bright demonstration nearest apart from this point; Have when a plurality of when choosing in the highest object of priority apart from the nearest map elements object of this point, optional one gets final product, on map, chooses this map key element object place figure layer;

Step 5: the user judges whether selected figure layer is the figure layer that desire is revised style: if not, then return step 3, reselect a bit; If then carry out step 6;

Step 6: display styles is provided with the interface, and key element style in the figure layer is set.

Step 7: the user judges whether select to confirm this style setting: if the user selects to confirm, then confirm that based on the user style that is provided with generates the map layer key element and is presented in the map; If the user is dissatisfied, then return step 6, continue the key element of selected figure layer is carried out the style setting.

2. the display styles method to set up of a kind of Vector Electronic Map information according to claim 1 is characterized in that: the condition precedent described in the step 1 comprises that the user uses mapping software to be constructed for representing whether the shape library of key element style is ready to, whether loads color libraries, whether set up style that the interface is set.

3. the display styles method to set up of a kind of Vector Electronic Map information according to claim 1 is characterized in that: be selected the priority default setting in the step 2 for being point, line, surface from height in order to hanging down.

4. the display styles method to set up of a kind of Vector Electronic Map information according to claim 1 is characterized in that: the key element style comprises shape, color, demonstration size and display width in the step 6.

5. the display styles method to set up of a kind of Vector Electronic Map information according to claim 1 is characterized in that: the style of selected figure layer can repeatedly be provided with in the step 7, and the figure layer finally is presented on the electronic chart with best style.

Images