Lines Matching +defs:a +defs:t

50 /// @param a vector

52 function l_vec($a, $b) {

53 	$ax = $a[1][0]-$a[0][0];

54 	$ay = $a[1][1]-$a[0][1];

71 /// @param a vector

73 function l_vec9($a, $b) {

74 	$ax = $a[1][0]-$a[0][0];

75 	$ay = $a[1][1]-$a[0][1];

112 	$a = array($arr[1], $arr[0]);

113 	$c = l_vec($a, 6);

176 function veclen($a){

177 	return sqrt($a[0] * $a[0] + $a[1] * $a[1]);

181 function vecsub($a, $b){

182 	return array($a[0] - $b[0], $a[1] - $b[1]);

186 function vecdist($a, $b){

187 	return veclen(vecsub($a, $b));

190 /// Returns dividing point of line between $a and $b that divide

191 /// the line by $t and 1 - $t.

192 function midPoint($a, $b, $t){

193 	return array($a[0] * (1. - $t) + $b[0] * $t,

194 		$a[1] * (1. - $t) + $b[1] * $t);

197 /// Obtain coordinates of a point on a quadratic bezier curve.

198 function quadraticBezierPoint($a, $b, $c, $t){

199 	$ab = midPoint($a, $b, $t);

200 	$bc = midPoint($b, $c, $t);

201 	return midPoint($ab, $bc, $t);

204 /// Obtain coordinates of a point on a cubic bezier curve.

205 function cubicBezierPoint($a, $c, $d, $b, $t){

206 	$ac = midPoint($a, $c, $t);

207 	$cd = midPoint($c, $d, $t);

208 	$db = midPoint($d, $b, $t);

209 	$acd = midPoint($ac, $cd, $t);

210 	$cdb = midPoint($cd, $db, $t);

211 	return midPoint($acd, $cdb, $t);

215 /// Draws a cubic Bezier curve on image $im.

217 	$a = array($prev["x"], $prev["y"]);

219 	$c = isset($p["cx"]) && isset($p["cy"]) ? array($p["cx"], $p["cy"]) : $a;

222 	// If both c and d control points are not defined, just draw a straight line,

224 		imageline($im, $a[0], $a[1], $b[0], $b[1], $color);

231 	$length = vecdist($a, $c)

236 	$a0 = $a;

238 	for($t = 0; $t <= $divs; $t++){

239 		$p1 = cubicBezierPoint($a, $c, $d, $b, $t / $divs);

302 					for($t = 0; $t <= $divs; $t++){

303 						$p1 = quadraticBezierPoint($pts[0], $pts[1], $pts[2], $t / $divs);

345 							$a = array();

347 								$a[] = array($first2["cx"], $first2["cy"]);

349 								$a[] = array($first2["dx"], $first2["dy"]);

351 								$a[] = array($first2["x"], $first2["y"]);

352 							$a[] = array($first["x"], $first["y"]);

353 							l_hige($im, $a, $c);

358 							$a = array();

360 								$a[0] = array($last["dx"], $last["dy"]);

362 								$a[0] = array($last["cx"], $last["cy"]);

364 								$a[0] = array($last2["x"], $last2["y"]);

365 							$a[1] = array($last["x"], $last["y"]);

366 							l_hige($im, $a, $c);