User Interface Service Software Developerís Guide - Hitech Projects

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January 2008 Public Scene description The scene has been improved compared to previous version. Now a scene is a set of objects, each one described by a set of states represented by sprites and masks. Each state is associated to an identifier which allows changing the current state of an object dynamically. In addition, the polygons now serve as masks to identify selectable areas in an object. The scene is encoded in the MMIL format by a participant whose objType is Scene. The objects of the scene are represented as sub-participants which should have at least : • a mmil:mmilId feature which is a unique id identifying the object in the amigo framework (the id attribute of the participants identifies them only in the component), • a vis:position feature which represent its coordinates in the scene, • at least one sprite. A sprite is defined a as objects' sub-participants, they are defined by : • a mmil:objType feature which has always "Sprite" for value • a mmil:mmilId feature identifying uniquely the sprite • an optional vis:image feature giving the url of the image • an optional mask encoded by a vis:maskPoints feature • aspect features (fill, visible, color) A sprite should have a vis:image or a vis:maskPoints to be represented. The following table explains the look of an object according to the presence or absence of these features. Look of an object vis:image present vis:image absent vis:maskPoints present vis:maskPoints absent the object is an image with selectable areas given by the mask the object is an image fully selectable (a rectangular mask is created) the object is a polygon with no background image an exception is thrown while building the scene List of visual features: The visual namespace encodes all the visual aspects of the scene. In the following list : • a point is formatted as and a list of points are points separated from each other by spaces (x, y integers). • a color is either a symbolic value in { black, blue, cyan, darkGray, gray, green, lightGray, magenta, orange, pink, red, white, yellow } or a numeric rgb triplet , where , , and are integers ranging from 0 to 255. vis:image = optional URL of a background image vis:position = a position in the scene (point) vis:zIndex = the z-index representing the depth of the object, the lowest z-index corresponds to the most distant object (integer) Amigo IST-2004-004182 77/114
January 2008 Public vis:x = x coordinate (integer) vis:y = y coordinate (integer) vis:maskPoints = list of the points of the mask of a sprite (list of points) vis:maskColor = color of a mask vis:maskFilled = if the mask is a surface or a contour (true or false) vis:maskVisible = if the mask should be drawn or not (true or false) Here a scene example with no background image which contains only one object with two states : officeScene Scene Laptop laptop 100,100 Sprite open file:etc/office/laptop_open.gif true 20,214 23,172 19,26 24,23 245,17 248,22 262,165 311,205 311,216 306,220 26,228 21,224 Sprite closed file:etc/office/laptop_closed.gif true 20,206 23,169 28,166 259,159 309,196 310,204 311,216 304,221 27,230 20,225 Amigo IST-2004-004182 78/114
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