Tag：coordinate system
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Time：2021-6-8
Pay attention to the official account of “kite holders”, reply to “information” to get 500G information (all “arms”), and professional exchange groups. Ha ha) Through this article, you will understand the introduction of canvas and its more commonly used methods, and use canvas to achieve a piggy head. 1、 Introduction to canvas 1.1 what is […]
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Time：2021-4-24
1、 The main knowledge points of this article are as follows: 1. Authorized current location 2. Use of map component 3. Tencent map reverse address resolution 4. Transformation of coordinate system 2、 The results are as follows 3、 Wxml code 4、 CSS code page { width: 100%; height: 100%; } #map { height: 100%; width: […]
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Time：2021-4-2
A sharing meeting of “unveiling the mystery of mapping” Recorded my technology sharing in the group, students with the same needs can refer to it It takes about 70 minutes to share the whole process 1、 Why share front end related “map” knowledge (large screen display) many companies have corresponding large screen display systems, such […]
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Time：2021-3-15
var location = []; function getAddrGeo(addr) { //Get the latitude and longitude of an address, which can be used for mobile terminal to jump app navigation $.ajax({ type: “GET”, url: ” http://restapi.amap.com/v3/geocode/geo?key= Your key & S = rsv3 & address = “+ addr.trim(), success: function (response) { location = response.geocodes[0] && response.geocodes[0].location.split(“,”); }, error: function […]
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Time：2021-3-8
This article first appeared on CSDN website, and the following version has been further revised.Original text:Create signature component of canvas Reading guide June is another time when the project is tight, a big wave of demand hit, caught off guard. After a long and painful June, it’s time to sum up a wave. Recently, a […]
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Time：2020-12-24
This article mainly introduces how to use OpenGL es to render an image. The content includes: basic concept explanation, how to use glkit to render texture, how to use glsl to render texture. preface OpenGL（Open Graphics Library）It is developed and maintained by the Khronos group, a graphics software and hardware industry association that focuses on […]
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Time：2020-12-1
When using cgcontext, because the coordinates of quartz 2D and UIKit are inconsistent, it is necessary to change the context again to achieve the desired effect. 1. Introduction to origin of different coordinates In quartz 2D, the coordinate origin is in the lower left corner of the canvas, while in UIKit, it is consistent with […]
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Time：2020-10-31
A sharing meeting of front end “unveiling the mystery of mapping” Record my technology sharing in the group, students with the same needs can refer to it The whole sharing time is about 70 minutes 1、 Why share front end related “map” knowledge (large screen display) many companies have corresponding large screen display systems, such […]
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Time：2020-10-24
preface: This article introduces some SAGIT framework definitions, commonly used macro definitions. 1. Coordinate system correlation //Full screen #define STFullRect [UIScreen mainScreen].bounds #define STFullSize [UIScreen mainScreen].bounds.size //Empty screen #define STEmptyRect CGRectMake(0,0,0,0) //Coordinate system #define STRectMake(x,y,width,height) CGRectMake(x*Xpt,y*Ypt,width*Xpt,height*Ypt) #define STSizeMake(width,height) CGSizeMake(width*Xpt,height*Ypt) #define STPointMake(x,y) CGPointMake(x*Xpt,y*Ypt) #define STRectCopy(frame) CGRectMake(frame.origin.x,frame.origin.y, frame.size.width, frame.size.height); 2. Uiview view view: getting //! define a […]
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Time：2020-9-25
Blog moving, written at 16:23, October 19, 2017 CGAffineTransformMake(a,b,c,d,tx,ty) A D scaling, B C rotation, TX ty displacement Formula of (x, y) – > (x ‘, y’) x’ = ax + cy + tx y’ = bx + dy + ty Basic knowledge of matrix: struct CGAffineTransform { CGFloat a, b, c, d; CGFloat tx, […]
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Time：2020-9-11
Vehicle position and attitude is a basic problem in automatic driving. Only when the vehicle position and attitude are solved can the various modules of automatic driving be associated. The position and attitude of the vehicle are generally output by the positioning module of automatic driving. Taking Apollo as an example, the definition of vehicle’s […]
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Time：2020-8-17
Demand background 1. View the coordinates of all salesmen in a region2. Click the operator coordinates to display the specific information and current address3. Click the name of a salesman to automatically associate it with the location on the map4. Check the itinerary track of the salesman on that day5. Dynamically switch the custom icon […]
