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6ee514239e
- tools/atrf-*/atspi-*.c: renamed to atrf-*.c - tools/atrf-*/Makefile (MAIN): updated name of program - tools/atrf-*/*.c: updated path in title comment
100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
/*
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* atrf-rssi/zgrid.c - Display a surface in faux 3D with SDL/SDL_gfx
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*
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* Written 2010 by Werner Almesberger
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* Copyright 2010 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "SDL.h"
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#include "SDL_gfxPrimitives.h"
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#include "zgrid.h"
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#define SWAP(x, y) \
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do { typeof(x) swap_tmp = (x); (x) = (y); (y) = swap_tmp; } while (0)
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static int *alloc_row(int nx)
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{
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int *p;
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p = malloc(nx*sizeof(*p));
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if (p)
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return p;
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perror("malloc");
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exit(1);
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}
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static void draw_band(SDL_Surface *s, const int *ax, const int *ay,
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const int *bx, const int *by, int n, uint32_t fg, uint32_t bg)
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{
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Sint16 px[4], py[4];
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int i;
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for (i = n-2; i >= 0; i--) {
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px[0] = ax[i];
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px[1] = ax[i+1];
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px[2] = bx[i+1];
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px[3] = bx[i];
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py[0] = ay[i];
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py[1] = ay[i+1];
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py[2] = by[i+1];
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py[3] = by[i];
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filledPolygonColor(s, px, py, 4, bg);
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aalineColor(s, ax[i+1], ay[i+1], bx[i+1], by[i+1], fg);
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aalineColor(s, bx[i], by[i], bx[i+1], by[i+1], fg);
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}
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aalineColor(s, ax[0], ay[0], bx[0], by[0], fg);
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}
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static void draw_polyline(SDL_Surface *s, const int *px, const int *py,
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int n, uint32_t rgba)
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{
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int i;
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for (i = 0; i != n-1; i++)
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aalineColor(s, px[i], py[i], px[i+1], py[i+1], rgba);
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}
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void zgrid_draw(SDL_Surface *s, const int *z, int nx, int ny,
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int sx, int sy, int sxy, int x0, int y0, uint32_t fg, uint32_t bg)
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{
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int *lx = alloc_row(nx);
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int *ly = alloc_row(nx);
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int *px = alloc_row(nx);
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int *py = alloc_row(nx);
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int x, y, yz0;
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const int *zp;
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uint8_t a;
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for (y = ny-1; y >= 0; y--) {
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a = (ny-1-y)*0xe0/(ny-1)+0x1f;
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yz0 = s->h-y0-y*sy-1;
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zp = z+y*nx;
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for (x = 0; x != nx; x++) {
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px[x] = x0+x*sx+y*sxy;
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py[x] = yz0-zp[x];
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}
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if (y != ny-1) {
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draw_band(s, px, py, lx, ly, nx, fg | a, bg);
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}
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SWAP(px, lx);
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SWAP(py, ly);
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}
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draw_polyline(s, lx, ly, nx, fg | 0xff);
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}
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