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[/] [openmsp430/] [trunk/] [fpga/] [actel_m1a3pl_dev_kit/] [software/] [spacewar/] [rocket2.c] - Rev 158
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#include "spacewar.h" //************************************************************ // externals // extern volatile int xinit, yinit; extern void cline(int, int); void set_xy(int, int); extern void point(rkt_data *); //************************************************************ // // rkt2 // // draws rocket # 2 // // pa_x = xd2 + xs2 // pa_y = yd2 + ys2 // pb_x = xd2 - xs2 // pb_y = yd2 - ys2 // pc_x = xd2 - xs2/2 // pc_y = yd2 - ys2/2 // pd_x = (xd2 - xs2) - ys2/2 // pd_y = (yd2 - ys2) + xs2/2 // pf_x = (xd2 - xs2) + ys2/2 // pf_y = (yd2 - ys2) - xs2/2 // /* Description: Draws rocket 2 made of five lines. This rocket looks like an arrowhead Also draws rocket 2 torpedos as points. On exit leaves the DAC parked at the center of the screen. */ void rocket2(rkt_data *rkt2) { int tmp_x, tmp_y; int half_xs2, half_ys2; tmp_x = rkt2->xdisp - rkt2->xsize; // pb_x = xd2 - xs2 tmp_y = rkt2->ydisp - rkt2->ysize; // pb_y = yd2 - ys2 half_xs2 = rkt2->xsize >> 1; // xs2/2 half_ys2 = rkt2->ysize >> 1; // ys2/2 xinit = tmp_x; // start pb_x yinit = tmp_y; // start pb_y cline(rkt2->xdisp + rkt2->xsize, rkt2->ydisp + rkt2->ysize); // draw line #1 b->a cline(tmp_x + half_ys2, tmp_y - half_xs2); // draw line #2 a->f cline(rkt2->xdisp - half_xs2, rkt2->ydisp - half_ys2); // draw line #3 f->c cline(tmp_x - half_ys2, tmp_y + half_xs2); // draw line #4 c->d cline(rkt2->xdisp + rkt2->xsize, rkt2->ydisp + rkt2->ysize); // draw line #5 d->a point(rkt2); // update and draw rkt2's torpedoes set_xy(center, center); // park dot at center of screen }
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