Electronic map local display method and device
An electronic map and display method technology, applied in the directions of map/plan/chart, graphic image conversion, image data processing, etc., can solve the problem of inconvenient observation of map information, etc., and achieve the effect of convenient and quick map query operation
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Embodiment 1
[0030] figure 1 The electronic map partial display method provided by Embodiment 1 of the present invention, as shown in the figure, includes the following steps:
[0031] Step 110, acquiring the local display area selected by the user in the global map of the electronic map.
[0032] Wherein, the global map refers to the entire screen of the electronic map when no partial display is performed. The local display area refers to the area selected by the user of the electronic map in the global map of the electronic map for partial display.
[0033] Specifically, the map point input by the user in the global map may be acquired, and a local display area of a preset shape and size may be generated centered on the map point. For example, it can be acquired by clicking. Wherein, the clicking means that the user selects a map point in the global map. Specifically, the user can touch a certain point in the global map for a long time with a finger or a handwriting tool, or double-...
Embodiment 2
[0047] This embodiment specifically introduces the implementation of displaying map data in the local display area in the above step 130, such as image 3 shown, including the following steps:
[0048] Step 210, create a local frame buffer object, and fill the texture into the color buffer of the local frame buffer object.
[0049] The frame buffer is a storage space for storing rendering data processed or to be extracted by the graphics card chip. The frame buffer object (Frame Buffer Object, FBO for short) includes multiple frame buffers, such as a color buffer, a depth buffer, a template buffer, and the like. Among them, two types of data can be filled in the color buffer: one is texture data, which is used to copy rendering data to it; the other is buffer data, which is used to fill when the color buffer is not needed. The local framebuffer object is a framebuffer object for generating a partial image.
[0050] Step 220, create an instance of the partial graph, and bind...
Embodiment 3
[0065] This embodiment provides a partial display device for an electronic map, which can implement the above method, such as Figure 5 As shown, it includes: an area acquisition module 11, a ratio setting module 12, a data acquisition module 13 and an overlay display module 14, and its working principle is as follows:
[0066] The area acquisition module 11 acquires the local display area selected by the user in the global map of the electronic map. Specifically, the map point input by the user in the global map can be obtained, and a local display area with a preset shape and size can be generated centering on the map point; or, the user can also obtain the The closed area input in the global map of the map is used as the local display area.
[0067] Then, the local scale corresponding to the local display area is set by the scale setting module 12, and the local scale can be larger or smaller than the global scale of the global map; specifically, the global scale of the gl...
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