#usage "<b>Snap objects in a board</b>\n"
       "<p>"
       "Snaps components, wires and vias of the current "
       "board to a given grid. "
       "If 'Show script' is checked, you can edit the MOVE commands "
       "before they are executed. So you are able to exclude certain "
       "elements from the snap procedure."
       "<p>"
       "<author>Author: support@cadsoft.de</author>"

// THIS PROGRAM IS PROVIDED AS IS AND WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED

string Version = "Version 1.1"; // 2009-01-28 move step by step
                                // 1. Packages
                                // 2. Vias
                                // 3. Wires    alf@cadsoft.de

real   GridDist = 25.0;
enum   { unitINCH, unitMIL, unitMM, unitMIC };
string h, cmd = "";
int    unit = unitMIL;   // predefined unit, can be changed to unitMM, unitINCH, unitMIC
int    Result;
string Status = "";
string script_name;

int cntm = 0;             // count unsnaped

int n = 0, x[], y[], l[], UsedLayers[];


real u2unit(int u) {
  if (unit == unitMIL)  return u2mil(u);
  if (unit == unitMM)   return u2mm(u);
  if (unit == unitINCH) return u2inch(u);
  if (unit == unitMIC)  return u2mic(u);
}


real snap(int n) {  // returns next grid point
  return round(u2unit(n) / GridDist)  * GridDist;
}


int isNew(int X, int Y, int L) {
  for (int i = 0; i < n; i++) {
    if (x[i] == X && y[i] == Y && (l[i] == L || l[i] == LAYER_VIAS )) return 0;
  }
  return 1;
}


void Move(int Layer) {
  if (UsedLayers[Layer]) {
    sprintf(h, "DISPLAY NONE %d;\n", Layer);
    cmd += h;
    // Snap the signal wires and vias:
    for (int i = 0; i < n; i++) {
      if (l[i] == Layer && (u2unit(x[i]) != snap(x[i]) || u2unit(y[i]) != snap(y[i]))) {
        sprintf(h, "MOVE (%f %f) (%f %f);\n", u2unit(x[i]), u2unit(y[i]), snap(x[i]), snap(y[i]));
        cmd += h;
        cntm++;
      }
    }
  }
  return;
}

real check_coord(int x, int y) {
  real v1, v2;
  v1 = snap(x) - u2unit(x);
  v2 = snap(y) - u2unit(y);
  if (v1) return v1;
  else if(v2) return v2;
  else return 0;
}


void snap_to_grid(void) {
  board(B) {
    script_name = filesetext(B.name, "~snap.scr");
    // Remember the active layers:
    int ActiveLayers[];
    B.layers(L) {
      ActiveLayers[L.number] = L.visible;
    }
    if (unit == unitMIL)  {
      sprintf(h, "GRID MIL FINEST;\n");
      cmd += h;
    }
    if (unit == unitMM)   {
      sprintf(h, "GRID MM FINEST;\n");
      cmd += h;
    }
    if (unit == unitINCH) {
      sprintf(h, "GRID INCH FINEST;\n");
      cmd += h;
    }
    if (unit == unitMIC)  {
      sprintf(h, "GRID MIC FINEST;\n");
      cmd += h;
    }
    sprintf(h, "SET OPTIMIZING OFF;\n"); // 2009-01-28
    cmd += h;
    if (!argv[1]) {  // 1. snap elements
      // Snap the elements:
      B.elements(E) {
        status("Element: "+E.name);
        if (u2unit(E.x) != snap(E.x) || u2unit(E.y) != snap(E.y)) {
          sprintf(h, "MOVE %s (%f %f);\n", E.name, snap(E.x), snap(E.y));
          cmd += h;
          cntm++;
        }
      }
    }
    // snap check vias
    if (argv[1] == "V") {  // 2. snap vias
      // Collect all (unique!) signal via coordinates:
      B.signals(S) {
        status("Signal: "+S.name);
        S.vias(V) {
          UsedLayers[LAYER_VIAS] = 1;
          x[n] = V.x;
          y[n] = V.y;
          l[n] = LAYER_VIAS;
          if(check_coord(V.x, V.y)) n++;
        }
      }
    }
    if (argv[1] == "E" && n) {
      cmd  = "";
      for (int vn = 0; vn < n; vn++) {
        sprintf(h, "(%.4f %.4f);\n", u2unit(x[vn]), u2unit(y[vn]) );
      }
      cmd+=h;
      sprintf(h, "Kann %d VIAs nicht snapen\n", n);
      dlgMessageBox(h+cmd, "OK");
      exit(-1);
    }
    // snap check wires
    if (argv[1] == "W") {   // 3. snap wires
      // Collect all (unique!) signal wire coordinates:
      B.signals(S) {
        status("Signal: "+S.name);
        S.wires(W) {
          UsedLayers[W.layer] = 1;
          if (isNew(W.x1, W.y1, W.layer)) {
            x[n] = W.x1;
            y[n] = W.y1;
            l[n] = W.layer;
            if (check_coord(W.x1, W.y1)) n++;
          }
          if (isNew(W.x2, W.y2, W.layer)) {
            x[n] = W.x2;
            y[n] = W.y2;
            l[n] = W.layer;
            if (check_coord(W.x2, W.y2)) n++;
          }
        }
      }
    }

    // Go through the used layers (this avoids problems with wires on different
    // layers that are selected at the same coordinates):
    for (int u = LAYER_TOP; u <= LAYER_BOTTOM; u++) {
      Move(u);
    }
    Move(LAYER_VIAS);

    // Reactivate the active layers:
    sprintf(h, "DISPLAY");
    cmd += h;
    for (int j = 1; j < 256; j++) {
      if (ActiveLayers[j]) {
        sprintf(h, " %d", j);
        cmd += h;
      }
    }
    sprintf(h, ";\n");
    cmd += h;
    if (!argv[1]) {
      sprintf(h, "RUN '%s' 'V' %d %.4f;\n", argv[0], unit, GridDist);
    }
    else if (argv[1] == "V") {
      sprintf(h, "RUN '%s' 'W' %d %.4f;\n", argv[0], unit, GridDist);
    }
    else if (argv[1] == "W") {
      sprintf(h, "RUN '%s' 'E' %d %.4f;\n", argv[0], unit, GridDist);
    }
    else if (argv[1] == "E") {
      exit(0);
    }
  }
  return;
}


//---- main ----------------------------------------------------------------------

if (!board) {
  dlgMessageBox(usage + "<hr><b>ERROR: No board!</b><p>\nThis program can only work in the board editor.");
  exit(1);
}

if (argc == 4) {
  unit = strtol(argv[2]);
  GridDist = strtod(argv[3]);
  snap_to_grid();
}

else {
  dlgDialog("Snap Packages/Wires/Vias") {
    dlgHBoxLayout {
      dlgHBoxLayout {
        dlgGroup("Unit") {
          dlgRadioButton("&inch", unit);
          dlgRadioButton("&mil",  unit);
          dlgRadioButton("&mm",   unit);
          dlgRadioButton("&mic",  unit);
          dlgSpacing(20);
          dlgLabel("Snap grid ");
          dlgRealEdit(GridDist, 0.0001, 1000);
        }
      }
      dlgSpacing(10);
      dlgVBoxLayout {
        dlgSpacing(10);
        dlgLabel(Status, 1);
        dlgHBoxLayout {
          dlgPushButton("+&Snap") {
            Status = "Busy...";
            dlgRedisplay();
            snap_to_grid();
            dlgAccept();
          }
          dlgPushButton("-&Cancel") exit(0);
        }
        dlgSpacing(7);
      }
    }
  };
}

output(script_name, "wtD") printf(cmd);
string s;
sprintf(s, "SCRIPT '%s'\n;GRID LAST;\n%s;\n", script_name, h);
exit(s);