display.setDefault()

Overview

Set default display values including default colors for display objects, anchor point defaults, texture wrapping settings, etc.

Syntax

Any of the following are valid:

display.setDefault( key, value )

display.setDefault( key, r, g, b, alpha )

display.setDefault( key, r, g, b )

display.setDefault( key, gray )

display.setDefault( key, gray, alpha )

Display Object Keys

These keys specify default anchor values and anchor bounds for all display objects.

• "anchorX" — The anchor alignment along the x direction. This value is used for the value of the anchorX property in new objects. The default is 0.5 (centered along the x direction).

• "anchorY" — The anchor alignment along the y direction. This value is used for the value of the anchorY property in new objects. The default is 0.5 (centered along the y direction).

• "isAnchorClamped" — If set to false, anchor positions along either the x or y direction are not constrained to values between 0 and 1. In this case, setting anchor values outside of this range (negative or positive) will position the anchor outside the bounds of the display object. Default is true.

Color Keys

A color key specifies which default color value to set.

• "background" — Corresponds to the default color for that the screen is cleared with. The default is initially black (0,0,0).

• "fillColor" — Corresponds to the default fill color for vector objects like display.newRect(). The default is initially white (1,1,1).

• "strokeColor" — Corresponds to the default stroke color for vector objects like display.newRect(). The default is initially white (1,1,1).

• "lineColor" — Corresponds to the default color for line objects like display.newLine(). The default is initially white (1,1,1).

Native Keys

• "isNativeTextBoxFontSizeScaled" — Sets the default Boolean value to be assigned to a native text box's object.isFontSizeScaled property when created via the native.newTextBox() function. This is true by default. Set to false to enable legacy font handling support.

• "isNativeTextFieldFontSizeScaled" — Sets the default Boolean value to be assigned to a native text field's object.isFontSizeScaled property when created via the native.newTextField() function. This is true by default. Set to false to enable legacy font handling support.

Texture Keys

• "preloadTextures" — The default behavior for texture loading is to load the texture when the display object is created or when the display object uses it. Setting this value to false will delay loading of the texture to when the object appears on screen or to when it becomes visible.

• "isImageSheetSampledInsideFrame" — Affects how image sheet frames are sampled. If set to true, sampling is intruded by half of the source texture pixel size to avoid border artifacts. Default is false.

• "magTextureFilter" — The default magnification sampling filter applied whenever an image is loaded by Corona. Once an image is loaded the first time, the same sampling filter will be applied for any subsequent loads of the same file. This is because textures are loaded once per file. Default value is "linear". Alternative value is "nearest".

• "minTextureFilter" — The default minification sampling filter applied whenever an image is loaded by Corona. Once an image is loaded the first time, the same sampling filter will be applied for any subsequent loads of the same file. This is because textures are loaded once per file. Default value is "linear". Alternative value is "nearest".

• "textureWrapX" — The texture wrap mode along the x direction. Once an image is loaded the first time, the same wrap mode will be applied for any subsequent loads of the same file. This is because textures are loaded once per file. Default value is "clampToEdge". Other values are useful for patterns and include "repeat" or "mirroredRepeat".

• "textureWrapY" — The texture wrap mode along the y direction. Once an image is loaded the first time, the same wrap mode will be applied for any subsequent loads of the same file. This is because textures are loaded once per file. Default value is "clampToEdge". Other values are useful for patterns and include "repeat" or "mirroredRepeat".

Camera Source

• "cameraSource" — The default behavior for a camera object fill is to use the back-facing camera. Setting this value to "front", will change the behavior to use the front-facing camera. Note that this is an iOS-only feature.

Examples

-- Set default anchor point for objects to bottom-left
display.setDefault( "anchorX", 0 )
display.setDefault( "anchorY", 1 )

display.setDefault( "isAnchorClamped", false )
--display.setDefault( "isAnchorClamped", true )

local rect = display.newRect( 200, 240, 100, 100 )
rect.anchorX = -1
rect.anchorY = 1.5

transition.to( rect, { rotation=135, delay=500 } )

-- Set default fill color for vector objects to red
display.setDefault( "fillColor", 1, 0, 0 )

-- Set default screen background color to blue
display.setDefault( "background", 0, 0, 1 )

display.setDefault( "textureWrapX", "repeat" )
display.setDefault( "textureWrapY", "repeat" )

local x,y = display.contentCenterX, display.contentCenterY
local o = display.newRect( x, y, display.contentWidth, display.contentHeight )
o.fill = { type="image", filename="fish.small.red.png" }
o.fill.scaleX = 0.1
o.fill.scaleY = 0.1

if ( system.getInfo( "environment" ) ~= "simulator" ) then
    display.setDefault( "cameraSource", "front" )   -- Front-facing camera
    --display.setDefault( "cameraSource", "back" )  -- Back-facing camera
end