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1 /*! \page archi Internal Architecture
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2 *
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3 * \image html core.png
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4 * Above graphic is relationship among major objects of MadButterfly.
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5 * \ref redraw_man_t, redraw manager, is supposed to manage graphic elements,
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6 * shapes, and decide when and who to redraw on the output screen.
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7 *
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8 * \ref shape_t is base-type for all graphic objects. It can be a path,
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9 * a text, a ellipse, ..., or an image. When the states or attributes of
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10 * an graphic
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11 * object changed, managing redraw_man_t, the one that manages the graphic
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12 * object, will be notified. The redraw_man_t will schedule a redrawing
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13 * for every
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14 * dirty objects, changed ones, and relative objects. The relative objects
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15 * are objects effected by changed ones. For example, part of a relative
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16 * object may be hidden before changing, but it is re-explored after chaning.
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17 * The explored part of the object must be redrawed.
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18 *
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19 * The shape of shape objects are variable from type to type. To simplize
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20 * the problem, we use a rectangle to model the area occupied by an object.
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21 * \ref geo_t is the one used to model the rectangle. Shape objects should
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22 * update associated \ref geo_t objects to reflect changing of them-self.
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23 *
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24 * \ref coord_t is used to model transformation in coordinate system.
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25 * A \ref coord_t is actually an transform matrix with additional
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26 * informations. \ref coord_t
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27 * objects are organized as a tree according hierachy of group tags in
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28 * a SVG file.
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29 *
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30 * Colors or patterns used to stroke or fill shapes are described
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31 * by \ref paint_t . Every shape object has a paint, but a paint object
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32 * can be used by multiple shape objects. Once a paint is changed, all
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33 * objects that associate with the paint are dirty. They will be scheduled
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34 * by associated \ref redraw_man_t object to update graphics on
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35 * output screen.
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36 *
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37 */
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