note 55178 modified in function.swfshape.drawlineto by danbrown
| From: | danbrown@php.net | Date: | Thu, 18 Feb 2010 14:22:08 +0000 |
| Subject: | note 55178 modified in function.swfshape.drawlineto by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-166122@lists.php.net to get a copy of this message | ||
If you have the error <<drawlineto(): failed assertion>> :
Ming can't handel drawLineToTo if the distance from the previous point is over 8276.7 pixels
(mesured empiriticaly) in the vertical or horizontal axis
Why ?
Coordinates in SWF are in twips (20 twips = 1 pixel)
and 2^16 = 65536 = 3276.8 * 20
So we can assume that coordinates of drawLineTo in SWf are relatives to the previous point, and take
16 bits (plus the sign).
Or it can be ming that brings this limitation
These measures have been made with ming_setScale(20.00000000);
This issue doesn't seem to occur with movePenTo
Here's how you can handle this :
<?php
function splitForMing($x1, $y1, $x2, $y2) {
$res = array();
$nbSegments = floor(max(abs($x2 - $x1), abs($y2 - $y1)) / 3276) + 1;
for($i = 1; $i < $nbSegments ; $i++) { // ($nbSegments - 1) iterations in the loop : the 1st
point is assumed to have been already processed ; the last one is already known
$res[] = array($x1 + ($x2 - $x1) * $i / $nbSegments, $y1 + ($y2 - $y1) * $i /
$nbSegments);
}
$res[] = array($x2, $y2);
return $res;
}
ming_setScale(20.00000000);
ming_useswfversion(6); // With ming 0.3
$movie = new SWFMovie();
$movie->setDimension(20000,8000);
$movie->setBackground(0xcc, 0xcc, 0xcc );
$movie->setRate(24);
$polygone = new SWFShape();
$polygone->setRightFill($polygone->addFill(0xff, 0, 0));
$polygone->setLine(20, 0x7f, 0, 0);
$polygone->movePenTo(10000, 500); // No split needed for movePenTo
$tmp = splitForMing(10000, 500, 15000, 500);
for( $i = 0 ; $i < count($tmp) ; $i++) {
$polygone->drawLineTo($tmp[$i][0], $tmp[$i][1]); // C
}
$tmp = splitForMing(15000, 500, 15000, 5500);
for( $i = 0 ; $i < count($tmp) ; $i++) {
$polygone->drawLineTo($tmp[$i][0], $tmp[$i][1]); // C
}
$tmp = splitForMing(15000, 5500, 10000, 500);
for( $i = 0 ; $i < count($tmp) ; $i++) {
$polygone->drawLineTo($tmp[$i][0], $tmp[$i][1]); // C
}
$polygone->drawLineTo(15000, 15000);
$ajout = $movie->add($polygone);
$ajout->setName("test");
$movie->output();
?>
--was--
If you have the error <<drawlineto(): failed assertion>> :
Ming can't handel drawLineToTo if the distance from the previous point is over 8276.7 pixels
(mesured empiriticaly) in the vertical or horizontal axis
Why ?
Coordinates in SWF are in twips (20 twips = 1 pixel)
and 2^16 = 65536 = 3276.8 * 20
So we can assume that coordinates of drawLineTo in SWf are relatives to the previous point, and take
16 bits (plus the sign).
Or it can be ming that brings this limitation
These measures have been made with ming_setScale(20.00000000);
This issue doesn't seem to occur with movePenTo
Here's how you can handle this :
<?
function splitForMing($x1, $y1, $x2, $y2) {
$res = array();
$nbSegments = floor(max(abs($x2 - $x1), abs($y2 - $y1)) / 3276) + 1;
for($i = 1; $i < $nbSegments ; $i++) { // ($nbSegments - 1) iterations in the loop : the 1st
point is assumed to have been already processed ; the last one is already known
$res[] = array($x1 + ($x2 - $x1) * $i / $nbSegments, $y1 + ($y2 - $y1) * $i /
$nbSegments);
}
$res[] = array($x2, $y2);
return $res;
}
ming_setScale(20.00000000);
ming_useswfversion(6); // With ming 0.3
$movie = new SWFMovie();
$movie->setDimension(20000,8000);
$movie->setBackground(0xcc, 0xcc, 0xcc );
$movie->setRate(24);
$polygone = new SWFShape();
$polygone->setRightFill($polygone->addFill(0xff, 0, 0));
$polygone->setLine(20, 0x7f, 0, 0);
$polygone->movePenTo(10000, 500); // No split needed for movePenTo
$tmp = splitForMing(10000, 500, 15000, 500);
for( $i = 0 ; $i < count($tmp) ; $i++) {
$polygone->drawLineTo($tmp[$i][0], $tmp[$i][1]); // C
}
$tmp = splitForMing(15000, 500, 15000, 5500);
for( $i = 0 ; $i < count($tmp) ; $i++) {
$polygone->drawLineTo($tmp[$i][0], $tmp[$i][1]); // C
}
$tmp = splitForMing(15000, 5500, 10000, 500);
for( $i = 0 ; $i < count($tmp) ; $i++) {
$polygone->drawLineTo($tmp[$i][0], $tmp[$i][1]); // C
}
$polygone->drawLineTo(15000, 15000);
$ajout = $movie->add($polygone);
$ajout->setName("test");
$movie->output();
?>
http://php.net/manual/en/function.swfshape.drawlineto.php