degrees | 易学教程

glsl 内建函数

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Radians 示例 : radians(360)； radians(vec2(360,90))； //PI //vec2(PI,PI/4) 语法 : float radians(float degrees) vec2 radians(vec2 degrees) vec3 radians(vec3 degrees) vec4 radians(vec4 degrees) Degrees 示例 : degrees(PI)； //360 语法 : float degrees(float radians) vec2 degrees(vec2 radians) vec3 degrees(vec3 radians) vec4 degrees(vec4 radians) Sine 示例 : sin(PI/2)； //1 语法 : float sin(float angle) vec2 sin(vec2 angle) vec3 sin(vec3 angle) vec4 sin(vec4 angle) Cosine 示例 : cos(PI/2)； //0 语法 : float cos(float angle) vec2 cos(vec2 angle) vec3 cos(vec3 angle) vec4 cos(vec4 angle) Tangent 示例 : tan(PI/4)； //1 语法 :

Android Camera开发系列：调整Camera预览方向

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有时候我们想根据自己的需要调整下Camera的预览方向，那么是调用哪个API可以达到我们的目的呢？我们看下下图拍的几张小可爱的照片，分别是正常方向、旋转180度、90度拍的照片。（正常方向）（旋转180度）（旋转90度）一、Camera API Camera1上，我们可以通过 setDisplayOrientation（int degress）；来设置camera预览的方向。 mCamera.setDisplayOrientation(Surface.ROTATION_180); 这里也贴下源码里面关于setDisplayOrientaion接口的详细说明。 /** * Set the clockwise rotation of preview display in degrees. This affects * the preview frames and the picture displayed after snapshot. This method * is useful for portrait mode applications. Note that preview display of * front-facing cameras is flipped horizontally before the rotation, that * is, the

Find a point on a circle circumference based on degrees

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问题 Let's say that you have a stick figure. Let's say the stick figure has an elbow and a hand. What if the stick figure wants to spin his hand in a windmill without moving his elbow? If the elbow serves as the center of a circle, and the hand must always be on the circle's circumference, and I know the exact location of the elbow and hand, how do I move the hand around the circle's circumference, while preserving the radius (the length of the arm between the elbow and hand because it really

Convert decimal coordinate into degrees, minutes, seconds, direction

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问题 I have the following so far, but can't figure out a tidy way to get the direction letters in without a bunch of messy if statements. Any ideas? Ideally I'd like to extend the CLLocation class with a category to do this. -(NSString *)nicePosition{ double latitude = [self.latitude doubleValue]; double longitude = [self.longitude doubleValue]; int latSeconds = (int)round(latitude * 3600); int latDegrees = latSeconds / 3600; latSeconds = abs(latSeconds % 3600); int latMinutes = latSeconds / 60;

ANDROID JAVA move control in direction in degrees

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问题 How do you move an control (for example a ImageView) in a certain direcion in degrees. There is no coordinate where the control needs to stop moving. we want to move it in a direction in degrees (0-360) This doesn't work: RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); params.setMargins(100,75, 0,0); params.topMargin= 100; 回答1: Found the solution, this is it: Sinus was the solution...

Reshaping EPA wind speed & direction data with dcast in R

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问题 I am trying to convert long format wind data into wide format. Both wind speed and wind direction are listed within the Parameter.Name column. These values need to be cast by both Local.Site.Name, and Date.Local variables. If there are multiple observations per unique Local.Site.Name + Date.Local row, then I want the mean value of those observations. The built-in argument 'fun.aggregate = mean' works just fine for wind speed, but mean wind direction cannot be computed this way because the

import degree symbol (°) from excel or csv file to mssql database

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问题 I have a field in my csv file which contains the text: Frozen at 20°C but when i import into my database it appears as: Frozen at 20�C anyone know how i can keep the correct degree symbol? my import code looks like this string fieldValue = csv[i].Trim(); 回答1: I just needed to specify Encoding.Default when creating my stream reader CsvReader csv = new CsvReader(new StreamReader(file.InputStream, Encoding.Default), true) Thanks for all the help Stephane you got me there in the end. 来源： https:/

Can Google Maps plot points based on Hours Minutes Seconds

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问题 I'm trying to plot out GPS data that is given to me in Hour Minute Second degree format. Will GLatLng take it in this form or do I need to convert it first. Having a hard time finding anything on the internet about this. If it can take it in this format an example would be much appreciated. 回答1: As far as I know it does not accept that format, but its really easy to convert it, just do the math: var = hour+(((minute*60)+(second))/3600); 来源： https://stackoverflow.com/questions/1751965/can

Why do we use radians in programming?

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问题 I like radians just as much as the next guy, and typically prefer to use them over degrees, but why do we use radians in programming? To rotate something 180 degrees, you need to rotate it by 3.14159265... . Sure, most languages have some kind of constant for pi, but why do we ever want to use irrational numbers like pi when we can instead use integers, especially for simple programs? We're relying on the computer to say that 3.14159265 is close enough to pi that functions like sine and

Display different values at different angles in a circle using html5 canvas

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问题 Using HTML5 Canvas and Javascript I need to display different values (represented by a dot maybe) at different angles inside a circle. Example data: val 34% @ 0°, val 54% @ 12°, val 23% @ 70°, and so on... If I have a canvas 300 x 300px and the center of the circle is located at x: 150px and y: 150px with a radius of 150px, how would I calculate where to set my dot for the value 54% at 12 degrees? My math is kinda terrible xD I'd appreciate any kind of help and please ask questions if I do