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[/] [openmsp430/] [trunk/] [fpga/] [actel_m1a3pl_dev_kit/] [software/] [spacewar/] [explode.c] - Rev 158
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//************************************************************ // externals // extern volatile int xdisp1, ydisp1; extern void set_xy(int, int); //************************************************************ // // explode // // make explosion at exp_x, exp_y // /* Description: Generate a visible explosion at position exp_x, exp_y. This function reads ints from code space as random numbers to draw points around the exp_x, exp_y position. The ints are scaled to 8 bits and added to exp_x, and exp_y to generate a random position centered on exp_x, exp_y. A point is displayed at each position. */ void explode(int exp_x, int exp_y) { int i, j, xfin, yfin; int *rp; rp = (int *)0xF880; // use code space as randon number for(i = 0; i < 32; i++) { xfin = exp_x + (*rp++ >> 8); yfin = exp_y + (*rp++ >> 8); set_xy(xfin, yfin); for(j = 0; j < 16384; j++) { } } }
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