Revision as of 20:53, 29 June 2011

Painting

See the "Painting and Layout" section, part of the Global Plasmoid object chapter, for information on using these classes within a widget.

Pixmaps

The QPixmap object allows widgets to use pixmaps for painting. Widgets may include pixmaps in various common formats (PNG, JPEG, GIF, etc.) in the contents/images/ directory of the Plasmoid package and load them by passing the name of the file into the pixmap constructor:

    var pixmap = new QPixmap("myimage.png")

In addition to being used as a file load, some objects return or take pixmaps and the QPixmap object facilitates that as well.

Read-only properties:

boolean null: true if the pixmap is empty
QRectF rect: the rect of the pixmap

Functions:

QPixmap scaled(number width, number height): returns a scaled version of the pixmap with width and height dimensions.

Icons

(Since 4.4.1)

The QIcon object provides simple access to icons. They can be constructed using a String or a QPixmap, with the String version either loading a file from disk if given an absolute path (useful for loading icons from the Plasmoid's package) or from the desktop icon theme if given just a name (e.g. "file-open").

Read-only properties:

boolean null: true if the icon is empty

Functions:

addPixmap(QPixmap): adds another pixmap to this icon
addFile(String): adds another file to this icon

SVG Images

Plasma makes heavy usage of SVG images. More information on this industry standard scalable vector format can be found here:

http://www.w3.org/Graphics/SVG/

Free and Open Source Software tools for creating SVGs include Inkscape and Karbon13. Widgets may include their own SVG files in the contents/images/ directory or may use SVG images that are part of the standard Plasma Desktop Theme as documented here:

http://techbase.kde.org/Projects/Plasma/Theme

Two classes are provide: Svg and FrameSvg. Svg allows loading and painting entire SVG documents or individual elements in an SVG document. FrameSvg extends Svg with methods to paint bordered frames from specially crafted SVG documents (see the Plasma Desktop Theme documentation for more information on this).

Svg

Constructors:

Svg(string fileName)': fileName can be a file in the desktop theme or the plasmoid package

Read-only properties:

QSizeF size: the current size of the svg

Read-write properties:

boolean multipleImages: whether or not the svg contains multiple separate images
string imagePath: the file path, including name of the svg
boolean 'usingRenderingCache: whether or not to cache rendered pixmaps; improves performance (at the cost of some disk and memory usage) for SVG data that is repeatedly rendered

Functions:

QSizeF elementSize(String svgElemen)
QRectF elementRect(String svgElemen)
boolean hasElement(String svgElement)
elementAtPoint(QPoint pos)
boolean isValid()
QPixmap pixmap(String svgElement): a pixmap of the element in the svg rendered to the current size
QPixmap pixmap(): a pixmap of the entire svg rendered to the current size
paint(QPainter painter, QPointF point)
paint(QPainter painter, QPointF point, String svgElement)
paint(QPainter painter, number x, number y)
paint(QPainter painter, number x, number y, String svgElement)
paint(QPainter painter, QRectF destination)
paint(QPainter painter, QRectF destination, String svgElement)
paint(QPainter painter, number y, number width, number height)
paint(QPainter painter, number x, number y, number width, number height, QString svgElement)
resize(number width, number height)
resize(QSizeF size)
resize(): resizes the SVG to the document size defined in the SVG itself

Signals:

repaintNeeded(): emitted when the SVG is in need of a repaint, such as when the theme changes and the SVG has reloaded its data

FrameSvg

Constructors:

FrameSvg(String fileName): fileName can be a file in the desktop theme or the plasmoid package

Read-only properties:

boolean multipleImages: whether or not the svg contains multiple separate images

Functions:

setEnabledBorders(EnabledBorders borders): sets which borders are enabled when painting
EnabledBorders enabledBorders(): the borders which are enabled when painting
resizeFrame(QSizeF size): resizes the frame to size
QSizeF frameSize(): the size of the current frame
number marginSize(MarginEdge margin): the size of the margin for a given edge
getMargins(number left, number top, number right, number bottom): stores the margin values in the variables passed in
QRectF contentsRect(): the rect containing the contents, e.g. the size of the SVG minus the space required by the enabled borders
setElementPrefix(Location): sets the frame element for the given location if it exists
setElementPrefix(String prefix): sets the element prefix
boolean hasElementPrefix(String prefix): returns true if the SVG contains a frame with the given prefix
boolean hasElementPrefix(Location location): true if the SVG contains a frame element for the given location
prefix()
mask()
setCacheAllRenderedFrames(bool)
cacheAllRenderedFrames()
QPixmap framePixmap(): a pixmap containing the current frame at the current size
paintFrame(QPainter painter)
paintFrame(QPainter painter, QPointF target)
paintFrame(QPainter painter, QRectF target)
paintFrame(QPainter painter, QRectF target, QRectF source)

Enumerations

EnabledBorder
- NoBorder
- TopBorder
- BottomBorder
- LeftBorder
- RightBorder
- AllBorders

Painting on the Canvas

QColor

Constructors:
- QColor
- QColor(string colorName)
- QColor(number red, number green, number blue, number alpha)

Functions:

setThemeColor(ThemeColor color): sets the color to the appropriate ThemeColor

Read/write properties:

number red
number green
number blue
number alpha
boolean valid

QFont

Constructors:
- QFont
- QFont(string fontName)
- QFont(string fontName, number pointSize)
- QFont(string fontName, number pointSize, number weight)
- QFont(string fontName, number pointSize, number weight, boolean italic)
string key
string lastResortFamily
string lastResortFont
string defaultFamily
boolean exactMatch
string toString
boolean bold
string family
boolean fixedPitch
undefined fromString
boolean italic
boolean kerning
boolean overline
number pixelSize
number pointSize
number pointSizeF
boolean strikeOut
number stretch
boolean underline
number weight
function isCopyOf
function resolve

QPainter

Constructors
- QPainter
- QPainter(object paintDevice): used to start a painter on a specific QWidget; rarely if ever needed in a JavaScript Plasmoid
object background
number backgroundMode
object brush
undefined setBrush
object brushOrigin
undefined clipping
object clipPath
object clipRegion
number compositionMode
object font
number layoutDirection
number opacity
object pen
number renderHints
undefined transform
object viewport
boolean viewTransformEnabled
object window
object worldMatrix
object worldTransform
boolean worldMatrixEnabled
object combinedMatrix
object combinedTransform
boolean active
function begin
function end
function boundingRect
function drawChord
function drawConvexPolygon
function drawArc
function drawEllipse
function drawImage
function drawLine
function drawLines
function drawPath
function drawPicture
function drawPie
function drawPixmap
function drawPoint
function drawPoints
function drawPolygon
function drawPolyline
function drawRect
function drawRects
function drawRoundRect
function drawText
function drawTiledPixmap
function eraseRect
function fillPath
function fillRect
function resetMatrix
function resetTransform
function restore
function rotate
function save
function scale
function setClipRect
function setRenderHint
function shear
function strokePath
function testRenderHint
function toString
function translate

QPen

Constructors:
- QPen
object brush
object color
number capStyle
number joinStyle
number style
number dashOffset
number miterLimit
number width
boolean solid
number red
number green
number blue
number alpha
boolean valid

QRectF

Read-only properties:

boolean empty: true if the rectangle's width or height is less than, or equal to, 0; an empty rectangle is also invalid
boolean null: true if the rectangle has both the width and the height set to 0; a null rectangle is also empty and not valid
boolean valid: true if the rectangle has a width > 0 and height 0.

Read-write properties:

number left
number top
number bottom
number right
number height
number width
number x
number y

Constructors:

QRectF
QRectF(number x, number y, number width, number height): Sets the coordinates of the rectangle's top-left corner to (x, y), and its size to the given width and height.

Functions:

adjust(number dx1, number dy1, number dx2, number dy2): adds dx1, dy1, dx2 and dy2 respectively to the existing coordinates of the rectangle
QRectF adjusted(number dx1, number dy1, number dx2, number dy2): returns a new QRectF with dx1, dy1, dx2 and dy2 added respectively to the existing coordinates of the rectangle
translate(number dx, number dy): translates the rect by dx, dy
setCoords(number x1, number y1, number x2, number y2): sets the coordinates of the rectangle's top-left corner to (x1, y1), and the coordinates of its bottom-right corner to (x2, y2).
setRect(number x, number y, number width, number height): sets the coordinates of the rectangle's top-left corner to (x, y), and its size to the given width and height.
boolean contains(number x, number y): returns true if the rect contains the point (x, y)
'moveBottom(number delta): moves the bottom by delta pixels
moveLeft(number delta): moves the left by delta pixels
moveRight(number delta): moves the right by delta pixels
moveTo(number x, number y): moves the top left of the rect to point (x, y)
moveTop(number delta): moves the top by delta pixels

QSizeF

Constructors:
- QSizeF
- QSizeF(number width, number height)
number height
number width

QPoint

Constructors:

QPoint
QPoint(number x, number y)

Read-only properties:

bool null
number manhattanLength

Read-write propertie:

number x
number y

@@ Line 9: / Line 9: @@
 <syntaxhighlight lang="javascript">
      var pixmap = new QPixmap("myimage.png")
-</code>
+</syntaxhighlight>
 In addition to being used as a file load, some objects return or take pixmaps and the QPixmap object facilitates that as well.