ScotlandPHP 2019

# SWFShape::drawLineTo

(PHP 5 < 5.3.0, PECL ming SVN)

SWFShape::drawLineToDraws a line

### Descrierea

SWFShape::drawLineTo ( float \$x , float \$y ) : void
Avertizare

Această funcție este EXPERIMENTALĂ. Comportamentul acestei funcții, denumirea sa și orice alte aspecte documentate în privința acestei funcții pot să fie modificate fără preaviz într-o versiune viitoare a PHP. Utilizați această funcție la propriul risc.

swfshape::setrightfill() draws a line (using the current line style, set by swfshape::setline()) from the current pen position to point (x,y) in the shape's coordinate space.

### Valorile întoarse

Nu este întoarsă nici o valoare.

### User Contributed Notes 1 note

lexmanspam at laposte dot net
13 years ago
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->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);