/[gzz]/gzz/gzz/vob/VobScene.java
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revision 1.17 by tjl, Fri Nov 22 15:23:11 2002 UTC revision 1.18 by tjl, Fri Nov 22 15:31:11 2002 UTC
# Line 80  import java.awt.*; Line 80  import java.awt.*;
80          // A translation RELATIVE to cs: the origin of cs_t is at (150, 125) on screen.          // A translation RELATIVE to cs: the origin of cs_t is at (150, 125) on screen.
81          int cs_t = vs.coords.translate(0, .5, .5, 0);          int cs_t = vs.coords.translate(0, .5, .5, 0);
82    
83            vs.matcher.add(cs, "V1");
84            // Sub key
85            vs.matcher.add(cs, cs_t, "X");
86     </pre>     </pre>
87        Now, cs_t will only be interpolated to a coordinate system whose parent is interpolated
88        to cs, and whose key is "X".
89        Here, both hierarchies were parallel, and indeed, usually they are. But sometimes
90        non-parallel hierarchies are useful. For example, if we are placing images next to a map
91        and markers on the map about where those images are, it's easier to do
92        <pre>
93            void placeImage(int imageCS, int mapCS, String param) {
94                // Place image into the image coordsys
95                // ...
96                int marker_cs = vs.coords.ortho(mapCS, 0, markx, marky, w, h);
97                vs.matcher.add(imageCS, marker_cs, "MARK");
98            }
99        </pre>
100        Here, the marker <i>transformation</i> is a child of the map transformation, but
101        as a <i>keyframe object,</i> for matching, its parent is imageCS.
102        This allows us to use the constant key "MARK" for all the marks.
103        <p>
104        However, you'll probably see this situation pretty rarely; most often the hierarchies
105        are indeed parallel, and for that case VobScene provides a shortcut:
106        <pre>
107            int cs = vs.orthoCS(0, "V1", 0, 100, 100, 100, 50);
108            int cs_t = vs.translateCS(cs, "X", .5, .5, 0);
109        </pre>
110        has the same effect as the earlier code.
111   * <p>   * <p>
112   *   *
113   */   */

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