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Difference between revisions of "SCI/FreeSCI/Pathfinding/Semantics"
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SCI/FreeSCI/Pathfinding/Semantics (view source)
Revision as of 03:09, 23 January 2011
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==Keyboard handling== | ==Keyboard handling== | ||
Even though the mouse is the main method for moving Ego in SCI1, the games still have keyboard support. This keyboard support exhibits the same | Even though the mouse is the main method for moving Ego in SCI1, the games still have keyboard support. This keyboard support exhibits the same behavior as in SCI0. That is, after the user presses a directional key Ego will move in that direction until he bumps into an object, at which point he will stop. As the user has only indicated a direction, it is impossible to know to what exact location the user wants Ego to go. No attempts to avoid obstacles are made. | ||
The games implement this by calling AvoidPath with the optimization level set to 0. The end point is chosen in such a way that it is outside of the display and exactly in the direction the user has indicated. For example, if Ego is positioned at coordinates (100, 100) and the user presses left; the end point might be (-10000, 100). Optimization level 0 is perfect for implementing this functionality as the returned path will move along the direct trajectory from start point to end point until the first obstacle is encountered (see Figure 1). The games simply take the first two points of the returned path and throw away the rest. | The games implement this by calling AvoidPath with the optimization level set to 0. The end point is chosen in such a way that it is outside of the display and exactly in the direction the user has indicated. For example, if Ego is positioned at coordinates (100, 100) and the user presses left; the end point might be (-10000, 100). Optimization level 0 is perfect for implementing this functionality as the returned path will move along the direct trajectory from start point to end point until the first obstacle is encountered (see Figure 1). The games simply take the first two points of the returned path and throw away the rest. | ||