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it has the ability to access the local variables of the calling instance in this way, but you must be sure that your calling instance has those variables. Of course, every instance has these bounding box variables, so this is not a concern here. Finally, in lines 13-16, the script uses the collision_rectangle function to check for instances of the object held by the variable stand_obj within a small rectangle beneath the instance s feet (as in Figure 11 4). The last two arguments of the collision_rectangle function specify that we want precise collision detection (which we do because we re looking for solid landscape, and that includes ramps and slopes), and that we want it to ignore collisions with itself (in case you wanted to check if a platform was on top of a platform). If it finds a collision, then the function returns the id of one of the colliding instances (a value > 0) and if it doesn t, then it returns a negative value. We don t care exactly which instance it is, so we return true from the script if it is greater than 0 and false otherwise. This return value can then be used to determine whether the script was successful in finding something to stand on.

Figure 11 4. Zool will now fall down in this situation (as he should) because we are only checking directly beneath his feet (in red)

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In the resource usage profiles shown up to now, wait events are just summarized. To have additional information, a histogram like the following is provided for every component of the resource usage profile. In this case, the statistics are related to the wait event db file scattered read of SQL statement 2. Notice how the wait events are grouped by their duration (column Duration). For example, you see that about 49 percent of the wait events lasted between 256 and 512 microseconds. Since a disk needs at least a few milliseconds to physically read some blocks, this means that about half of the I/O operations were served from an operating system or I/O subsystem cache. Since the wait event db file scattered read is associated with multiblock reads, it might also be useful to see the average number of blocks read by an I/O operation (column Blocks per Event).

Note If you want to find out more about a Game Maker function like collision_rectangle or any of the others discussed in this book, then select Contents from the Help menu and type the name of the function into the search tab. Usually, the first search result found will contain the help page for that function.

Since 5, we ve used the move_to_contact_with script as a way of ensuring that Zool stops when he comes into contact with a specific type of object, rather than all objects or just objects with the Solid flag set (which we wish to avoid using altogether). It does this using a brute force approach, moving one pixel at a time in the direction provided until it collides with an instance of the specified object. Let s look at how that works.

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1: { 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: 24: } var dirn, max_dist, contact_obj, dx, dy; dirn = argument0; max_dist = argument1; contact_obj = argument2; if( max_dist == -1 ) then max_dist = 1000; dx = lengthdir_x( 1, dirn ); dy = lengthdir_y( 1, dirn ); dist = 1; while( dist <= max_dist ) { if(place_meeting(x+dx,y+dy,contact_obj) == true) then return true; x = x + dx; y = y + dy; dist = dist + 1; } return false;

Figure 9-15. The first rule of writing a good how to guide is to lay out your materials!

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