Functions

Functions WebDev/*nix assorted functions & hacks

Images filetypeMatchesExtension($file) imagelinerectangle() issa clock rotate_wide_line($x, $y, $width, $length, $degrees) 4 found

auth

Name:
Category: Images
Body:

// I was hacking away at a clock. somehow I ended up with this.
//   x, y are the center coords of where a line would be drawn from.
//   width, length are of that line. degrees starts at 0 pointing straight up and ends at 359 (supporting multiples and negatives and such).
// It returns an array [x1, y1, .. x4, y4] (8 items) that can be used in .. wherever. They're pairs of coords.

// Todo: rewrite the thing so that it can take rectangle coords as input, and coords to rotate around

function rotate_wide_line($x, $y, $width, $length, $degrees) {
  $hw = $width / 2;
  $degrees = abs($degrees % 360);   // normalize
  $m = ($degrees/360)*2*M_PI;       // m for magic
  $lx = $x + sin($m) * $length;     // these are what the end points of the line would be
  $ly = $y - cos($m) * $length;     // we'll add offsets.
  $m2 = (($degrees-90)/360)*2*M_PI;    // m for magic
  $coords[0] = $x - sin($m2) * $hw; // these are the x/y coords of the "first" corner of the resulting polygon
  $coords[1] = $y + cos($m2) * $hw;
  $ox = $x - $coords[0]; // grab some offsets
  $oy = $y - $coords[1];
  $coords[2] = $x + $ox; // and apply to line coords for the rest of the coords
  $coords[3] = $y + $oy;
  $coords[4] = $lx + $ox;
  $coords[5] = $ly + $oy;
  $coords[6] = $lx - $ox;
  $coords[7] = $ly - $oy;
  return $coords;
}

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Images filetypeMatchesExtension($file) imagelinerectangle() issa clock rotate_wide_line($x, $y, $width, $length, $degrees) 4 found auth	Name: Category: Images Body: // I was hacking away at a clock. somehow I ended up with this. // x, y are the center coords of where a line would be drawn from. // width, length are of that line. degrees starts at 0 pointing straight up and ends at 359 (supporting multiples and negatives and such). // It returns an array [x1, y1, .. x4, y4] (8 items) that can be used in .. wherever. They're pairs of coords. // Todo: rewrite the thing so that it can take rectangle coords as input, and coords to rotate around function rotate_wide_line($x, $y, $width, $length, $degrees) { $hw = $width / 2; $degrees = abs($degrees % 360); // normalize $m = ($degrees/360)2M_PI; // m for magic $lx = $x + sin($m) * $length; // these are what the end points of the line would be $ly = $y - cos($m) * $length; // we'll add offsets. $m2 = (($degrees-90)/360)2M_PI; // m for magic $coords[0] = $x - sin($m2) * $hw; // these are the x/y coords of the "first" corner of the resulting polygon $coords[1] = $y + cos($m2) * $hw; $ox = $x - $coords[0]; // grab some offsets $oy = $y - $coords[1]; $coords[2] = $x + $ox; // and apply to line coords for the rest of the coords $coords[3] = $y + $oy; $coords[4] = $lx + $ox; $coords[5] = $ly + $oy; $coords[6] = $lx - $ox; $coords[7] = $ly - $oy; return $coords; }
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