GetWorldFromScreenPosition

2015-01-18T02:09:16Z

HyPeX:

__NOTOC__
{{Client function}}
This function allows you to retrieve the world position corresponding to the 2D position on the screen, at a certain depth.

If you want to detect what element is at a particular point on the screen, use [[processLineOfSight]] between the camera position and the position returned from this function when passed a high depth value (100 or so, depending how far away you want to detect elements at).

* Note - setting 0 as a distance will cause the points retrived to be right ontop of the screen, so if used for drawing ideas on the screen - using distance 0 (or a very close value to 0, will result in the image being not visible).

==Syntax==
<syntaxhighlight lang="lua">
float, float, float getWorldFromScreenPosition ( float x, float y, float depth )
</syntaxhighlight>

===Required Arguments===
*'''x:''' A float value indicating the x position on the screen, in pixels.
*'''y:''' A float value indicating the y position on the screen, in pixels.
*'''depth:''' A float value indicating the distance from the camera of the point whose coordinates we are retrieving, in units.

===Returns===
Returns three ''x'', ''y'', ''z'' [[float]]s indicating the world position if successful, ''false'' otherwise.

==Example==
This example binds the local player's "'''i'''" key to a function that creates an explosion in the middle of the screen.
<syntaxhighlight lang="lua">
function explosion ()
local w, h = guiGetScreenSize ()
local x, y, z = getWorldFromScreenPosition ( w/2, h/2, 10 )
createExplosion ( x, y, z, 11 )
end
bindKey ( "i", "down", explosion )
</syntaxhighlight>

==See Also==
{{Client_world_functions}}

Template:Useful Functions

2014-03-15T22:45:20Z

HyPeX:

*[[callClientFunction]] » This function allows you to call any clientside function from the server's side.
*[[callServerFunction]] » This function allows you to call any server-side function from the client's side.
*[[centerWindow]] » This function center the window in any resolution.
*[[Check]] » This function checks if it's arguments are of the right types and calls the error-function if one isn't.
*[[convertNumber]] » This function converts large numbers and adds commas to it. (Example: 100000 -> 100,000)
*[[coroutine.resume]] » Fix for hidden coroutine error messages
*[[dxDrawAnimWindow]] » Create Animated Dx Window
*[[dxDrawCircle]] » This function draws a 2D line in a circle shape on the screen.
*[[dxDrawColorText]] » This function draws a dx text with #RRGGBB color codes support.
*[[dxDrawGifImage]] » This function simulates the effect of a GIF image by using image sprites.
*[[dxDrawImage3D]] » This function draws a 3D image.
*[[dxDrawPartialCircle]] » This function draws a 2D line in a partial circle shape on the screen.
*[[dxDrawRectangle3D]] » This function draws a 3D rectangle.
*[[dxDrawEmptyRec]] » This funcions draws an empty rectangle.
*[[dxGetFontSizeFromHeight]] » This function calculate a font size from given height for dxDraw.
*[[dxGetRealFontHeight]] » Accurately measures the pixel height of a font.
*[[FewPlayersOnTeams]] » This function gets a team from it's few Players.
*[[findRotation]] » Takes two points and returns the direction from point A to point B.
*[[FormatDate]] » Formats a date on the basis of a format string and returns it.
*[[GenerateString]] » With this function you can generate a random string with any characters.
*[[getAge]] » This function calculates the age of a birthday.
*[[getAlivePlayers (Client)|getAlivePlayers]] » This function returns all the alive players by a client side, so you can store them into a Gridlist or something like that, faster.
*[[getAlivePlayersInTeam]] » This function returns a table of the alive players in a team.
*[[getBoundControls]] » This function returns a list of control names that are bound to the specified key.
*[[getCursorMoveOn]] » This function checks in which way the cursor is currently moving.
*[[getDistanceBetweenPointAndSegment2D]] » Takes point coordinates and line (a segment) starting and ending coordinates. It returns the shortest distance between the point and the line.
*[[getElementSpeed]] » This function allows you to get element speed in kph or mph units.
*[[getElementsInDimension]] » This function gets the elements that are in the specified dimension.
*[[getElementsWithinMarker]] » This function gets the elements that are in a markers colshape.
*[[getJetpackWeaponsEnabled]] » This function returns a table of enabled weapons usable on a jetpack.
*[[getKeyFromValueInTable]] » This function returns the key of the specified value in a table.
*[[getOffsetFromXYZ]] » This function allows you to take an entity and a position and calculate the relative offset between them accounting for rotations.
*[[getOnlineAdmins]] » This function will give the online admins.
*[[getOnlineStaff]] » Returns all online staff, names separated by two spaces.
*[[getPlayersByData]] » This function gets players who have data name you passed to it.
*[[getPlayerFromNamePart]] » This function allows you to get player From his Name part.
*[[getPlayersInPhotograph]] » This function gets all the players in a photograph.
*[[getPlayerFromSerial]] » This function gets an online player from their serial.
*[[getPointFromDistanceRotation]] » Finds a point based on a starting point, direction and distance.
*[[getResourceSettings]] » This function returns a table of the resource settings.
*[[getResourceScripts]] » This function returns a table of the resource scripts.
*[[getRGColorFromPercentage]] »This function returns two integers representing Red and Green colors according to the percentage requested.
*[[getScreenRotationFromWorldPosition]] » This function returns a screen relative rotation to a world position. The returned rotation can be used in dxDrawImage
*[[getTeamFromColor]] » This function gets a team from it's color. (Related to: [[getTeamFromName]])
*[[getTimestamp]] » With this function you can get the UNIX timestamp.
*[[getValidVehicleModels]] » This function returns a table containing valid MTA Vehicle models.
*[[getXMLNodes]] » Returns all children of a node
*[[getVehicleRespawnPosition]] » This function allows you to get the spawn position of a vehicle.
*[[guiComboBoxAdjustHeight]] » Adjusts the combobox to have a correct height.
*[[IfElse]] » Returns one of two values based on a boolean expression.
*[[isElementInPhotograph]] » This function checks if an element was in the player's camera picture.
*[[isElementInRange]] » This function allows you to check is the element's range to the main point is smaller than (or as big as) the maximum range.
*[[isElementMoving]]» This function checks if an element is moving.
*[[isElementTeam]]» This function checks if element is team.
*[[isElementWithinAColShape]]» This function checks if the [[element]] is in a [[colshape]].
*[[isPedAiming]]» This function checks if a ped is aiming.
*[[isPlayerInACL]] » This function will check to see if a player element is in an ACL group.
*[[isPlayerInTeam]] » This function check if the player in the team.
*[[isLeapYear]] » Checks if the given year is a leap year.
*[[isVehicleOnRoof]] » This function checks whether vehicle is on roof.
*[[isVehicleEmpty]] » This function checks whether a vehicle is empty.
*[[isSoundFinished]] » This function checks sound finished or not.
*[[iterElements]] » Returns an iterator for your for loops saving time typing ipairs( getElementsByType( type ) ), instead you type: iterElements( type ).
*[[mathNumber]] » This function is a workaround for the clientside floating-point precision of 24-bits
*[[math.percent]] » Return the porcent from one number.
*[[math.round]] » Rounds a number whereas the number of decimals to keep and the method may be set.
*[[multi_check]] » This function checks one element to many, handy and clean.
*[[onVehicleWeaponFire]] » This code implements an event that is triggered when a player in a vehicle fires a vehicles weapon.
*[[RGBToHex]] » This function returns a string representing the color in hexadecimal.
*[[secondsToTimeDesc]] » This function converts a plain seconds-integer into a user-friendly time description.
*[[setElementSpeed]] » This function allows you to set moving element speed in kph or mph units.
*[[setTableProtected]] » Protects a table and makes it read-only.
*[[setVehicleGravityPoint]] » This clientside function sets a vehicle's gravity in the direction of a 3 dimensional coordinate with the strength specified.
*[[smoothMoveCamera]] » This clientside function allows you to create a cinematic camera flight.
*[[string.count]] » This function counts a text from a text.
*[[string.explode]] » This function splits a string at a given separator pattern and returns a table with the pieces.
*[[switch]] » This function allow the value of a variable or expression to control the flow of program execution via a multiway branch.
*[[table.copy]] » This function copies a whole table and all the tables in that table.
*[[table.compare]] » This function check if both tables is equal. 
*[[table.empty]] » This function check is empty table or not.
*[[table.map]] » This function goes through a table and replaces every field with the return of the passed function, where the field's value is passed as first argument and optionally more arguments.
*[[table.merge]] » Merges two or more tables in the first.
*[[table.random]] » This function retrieves a random variable from a table.
*[[table.size]] » Finds the absolute size of a table.
*[[toHex]] » This function converts a decimal number to a hexadecimal number, as a fix to be used clientside.
*[[var dump]] » This function outputs information about one or more variables using outputConsole()
*[[wavelengthToRGBA]] » This function converts a phisical wavelength of light to a RGBA color.
[[Category:Useful Functions]]

Multi Theft Auto: Wiki - User contributions [en]

GetWorldFromScreenPosition

Template:Useful Functions