我有一个复杂的 PHP 片段，它使用 ImageFilledArc 绘制一个 2 冲程发动机时序图。它在 php 5.2 下工作了多年，但我的 ISP 已将服务器升级到 PHP 5.3，并且不再呈现弧线。下图显示了发生的情况以及预期的情况。
测试表明该函数将 FAIL（零）返回到“样式”的所有值。实验表明 ImageFilledRectangle 按预期工作（代码插入到程序中，因此它使用相同的目标 GD 图像实例和颜色值）。
网络搜索未发现任何提及 PHP 转换文档中任何图形函数的更改，也未发现任何其他人对此函数有问题。下面提供了绘制图形的代码。调用它的代码不是，但可以通过调用完全没有 args 的页面来测试它。
<?php
/*
* Creats a PNG image of the MBI CAD standard timing 2-stroke diagram.
*
* Created on Aug 10, 2007 by Ronald A Chernich, Brisbane, Australia.
* This work is licensed under the Creative Commons
* Attribution-Noncommercial-Share Alike 3.0 license.
* See: http://creativecommons.org/licenses/by-nc-sa/3.0
*
* 2007-08-08 1.0 First version
* 2007-08-13 1.1 Add FRV labeling adjustment
* 2007-08-15 1.2 Add SPI capability and blow-down
* 2007-08-15 1.2.1 Revise SPI representation to Inlet side of graph
* 2007-08-25 1.2.2 SPI and inlet labels overlapped in some cases. Fixed.
*/
$eo = $_GET['eo'];
$to = $_GET['to'];
$ic = $_GET['ic'];
$id = $_GET['id'];
$nm = $_GET['nm'];
$spi = $_GET['spi'];
// Test data for development
if (empty($nm)) {
$nm = 'Test';
$eo = 108;
$to = 123;
$ic = 15;
$id = 140;
}
$graph = new TimingDiagram($nm, $eo, $to, $ic, $id, $spi);
$graph->render();
/**
* Class to render image
*/
class TimingDiagram
{
var $WIDTH = 420;
var $HEIGHT = 420;
var $YMARGIN = 30;
var $XMIN = 2;
var $YMIN = 2;
var $BG_COLOR;
var $IN_COLOR;
var $TR_COLOR;
var $EX_COLOR;
var $LAP_COLOR;
var $AXIS_COLOR;
var $TITLE_COLOR;
var $image;
var $eo;
var $to;
var $ic;
var $id;
var $spi;
var $arc;
var $title;
var $degChar;
function TimingDiagram ($title, $eo, $to, $ic, $id, $spi)
{
$this->title = $title;
$this->eo = $eo;
$this->to = $to;
$this->ic = $ic;
$this->id = $id;
$this->spi = $spi;
$this->degChar = '°';
$this->image = ImageCreateTruecolor($this->WIDTH, $this->HEIGHT);
$this->InitColors();
$this->arc_y = $this->HEIGHT / 12;
$xmax = $this->WIDTH - (2 * $this->XMIN);
$ymax = $this->HEIGHT - (2 * $this->YMIN);
ImageFilledRectangle($this->image, $this->XMIN, $this->YMIN,
$xmax, $ymax, $this->BG_COLOR);
}
function initColors ()
{
$this->BG_COLOR = ImageColorAllocate($this->image, 255, 255, 255);
$this->TITLE_COLOR = ImageColorAllocate($this->image, 0, 0, 120);
$this->AXIS_COLOR = ImageColorAllocate($this->image, 200, 200, 200);
$this->IN_COLOR = ImageColorAllocate($this->image, 180, 180, 180);
$this->TR_COLOR = ImageColorAllocate($this->image, 120, 120, 120);
$this->EX_COLOR = ImageColorAllocate($this->image, 80, 80, 80);
$this->LAP_COLOR = ImageColorAllocate($this->image, 140, 140, 140);
}
function render ()
{
$x0 = $this->WIDTH / 2;
$y0 = $this->HEIGHT / 2;
$this->drawTitle($x0, $y0);
$this->drawSPI($x0, $y0);
$this->drawExhaust($x0, $y0);
$this->drawInlet($x0, $y0);
$this->drawSPI($x0, $y0);
$this->drawTransfer($x0, $y0);
$this->drawRot($x0, $y0);
Header("Content-type: image/png");
ImagePng($this->image);
ImageDestroy($this->image);
}
function drawTitle ()
{
$st = "Timing Diagram for $this->title.";
$fnt = 5;
$dx = ($this->WIDTH - (ImageFontWidth($fnt) * strlen($st))) / 2;
$dy = ($this->YMARGIN - ImageFontHeight($fnt)) / 2;
imagestring($this->image, $fnt, $dx, $dy, $st, $this->TITLE_COLOR);
}
function drawSPI ($x0, $y0)
{
if (is_numeric($this->spi)) {
$end = 270 - $this->spi;
$start = 270 + $this->spi;
$dx1 = .64 * $this->WIDTH;
$dy1 = .64 * $this->HEIGHT;
$dim = $this->arc_y * .75;
$dx2 = $dx1 - $dim;
$dy2 = $dy1 - $dim;
ImageFilledArc($this->image, $x0, $y0, $dx1, $dy1, $end, $start,
$this->IN_COLOR, IMAGE_ARC_PIE);
$res = ImageFilledArc($this->image, $x0, $y0, $dx2, $dy2, $end-1, $start+1,
$this->BG_COLOR, IMAGE_ARC_PIE);
$x = $this->WIDTH * 0.1;
$y = $this->HEIGHT * (($this->ic > 29) ? 0.3 : 0.2);
$this->labelEvent($x, $y, "SPI ends", "ATDC", $this->spi);
$this->labelEvent($this->WIDTH - $x, $y, "SPI starts", "ABDC",
(180 - $this->spi));
// Drawing SPI will have trashed the Inlet duration label
$fnt = 3;
$id = (empty($this->id) ? (2 * $this->ic) : $this->id);
$lab = sprintf('Inlet %.0f%s', $id, $this->degChar);
$dx = ($x0 - (ImageFontWidth($fnt) * strlen($lab)) / 2);
$dy = ($y0 - (.22 * $this->HEIGHT) - ImageFontHeight($fnt));
Imagestring($this->image, $fnt, $dx, $dy, $lab, $this->TITLE_COLOR);
$lab = sprintf('with %.0f%s', $this->spi * 2, $this->degChar);
$dy += ImageFontHeight($fnt);
$dx = ($x0 - (ImageFontWidth($fnt) * strlen($lab)) / 2);
Imagestring($this->image, $fnt, $dx, $dy, $lab, $this->TITLE_COLOR);
$lab = 'sub-piston induction';
$dy += ImageFontHeight($fnt);
$dx = ($x0 - (ImageFontWidth($fnt) * strlen($lab)) / 2);
Imagestring($this->image, $fnt, $dx, $dy, $lab, $this->TITLE_COLOR);
}
}
function drawExhaust ($x0, $y0)
{
if ($this->eo > 0) {
$ex = 180 - $this->eo;
$eo = 90 + $ex;
$ec = 90 - $ex;
$dx1 = .8 * $this->WIDTH;
$dy1 = .8 * $this->HEIGHT;
$dx2 = $dx1 - $this->arc_y;
$dy2 = $dy1 - $this->arc_y;
ImageFilledArc($this->image, $x0, $y0, $dx1, $dy1, $ec, $eo,
$this->EX_COLOR, IMAGE_ARC_PIE);
ImageFilledArc($this->image, $x0, $y0, $dx2, $dy2, $ec-1, $eo+1,
$this->BG_COLOR, IMAGE_ARC_PIE);
$fnt = 3;
$lab = sprintf('Exhaust %.0f%s', (2 * $ex), $this->degChar);
$dx = ($x0 - (ImageFontWidth($fnt) * strlen($lab)) / 2);
$dy = ($y0 + (.46 * $this->HEIGHT) - ImageFontHeight($fnt));
Imagestring($this->image, $fnt, $dx, $dy, $lab, $this->TITLE_COLOR);
$x = $this->WIDTH * 0.12;
$y = $this->HEIGHT * 0.86;
$this->labelEvent($x, $y, "Exhaust opens", "ATDC", $this->eo);
$this->labelEvent($this->WIDTH - $x, $y, "Exhaust closes", "ABDC",
180 - $this->eo);
}
}
function drawTransfer ($x0, $y0)
{
if ($this->to > 0) {
$tr = 180 - $this->to;
$to = 90 + $tr;
$tc = 90 - $tr;
$dx1 = .7 * $this->WIDTH;
$dy1 = .7 * $this->HEIGHT;
$dx2 = $dx1 - $this->arc_y;
$dy2 = $dy1 - $this->arc_y;
ImageFilledArc($this->image, $x0, $y0, $dx1, $dy1, $tc, $to,
$this->TR_COLOR, IMAGE_ARC_PIE);
ImageFilledArc($this->image, $x0, $y0, $dx2, $dy2, $tc-1, $to+1,
$this->BG_COLOR, IMAGE_ARC_PIE);
// Special case where FRV inlet overlaps transfer close
if (!empty($this->id)) {
$io = ($this->id - $this->ic) - 90;
if ($io > $tc) {
ImageFilledArc($this->image, $x0, $y0, $dx1, $dy1, $tc, $io,
$this->LAP_COLOR, IMAGE_ARC_PIE);
ImageFilledArc($this->image, $x0, $y0, $dx2, $dy2, $tc-1, $io+1,
$this->BG_COLOR, IMAGE_ARC_PIE);
}
}
$fnt = 3;
$lab = sprintf('Transfer %.0f%s', (2 * $tr), $this->degChar);
$dx = ($x0 - (ImageFontWidth($fnt) * strlen($lab)) / 2);
$dy = ($y0 + (.25 * $this->HEIGHT) - ImageFontHeight($fnt));
Imagestring($this->image, $fnt, $dx, $dy, $lab, $this->TITLE_COLOR);
$x = $this->WIDTH * 0.35;
$y = $this->HEIGHT * 0.65;
$this->labelEvent($x, $y, "Transfer opens", "ATDC", $this->to);
$this->labelEvent($this->WIDTH - $x, $y, "Transfer closes", "ABDC",
180 - $this->to);
}
}
function drawInlet ($x0, $y0)
{
if (is_numeric($this->ic)) {
$ic = 270 - $this->ic;
$id = (is_numeric($this->id) ? $this->id : 2 * $this->ic);
$io = $ic + $id;
$dx1 = .7 * $this->WIDTH;
$dy1 = .7 * $this->HEIGHT;
$dx2 = $dx1 - $this->arc_y;
$dy2 = $dy1 - $this->arc_y;
ImageFilledArc($this->image, $x0, $y0, $dx1, $dy1, $ic, $io,
$this->IN_COLOR, IMAGE_ARC_PIE);
ImageFilledArc($this->image, $x0, $y0, $dx2, $dy2, $ic-2, $io+2,
$this->BG_COLOR, IMAGE_ARC_PIE);
$fnt = 3;
$id = (empty($this->id) ? (2 * $this->ic) : $this->id);
$lab = sprintf('Inlet %.0f%s', $id, $this->degChar);
$dx = ($x0 - (ImageFontWidth($fnt) * strlen($lab)) / 2);
$dy = ($y0 - (.22 * $this->HEIGHT) - ImageFontHeight($fnt));
Imagestring($this->image, $fnt, $dx, $dy, $lab, $this->TITLE_COLOR);
$x = $this->WIDTH * 0.13;
$y = $this->HEIGHT * 0.2;
$isBTDC = $this->ic < 0;
$tag = $isBTDC ? 'BTDC' : 'ATDC';
if ($isBTDC || ($this->ic < 30)) {
$x = $this->WIDTH -
($isBTDC ? ($this->WIDTH * 0.3) : ($this->WIDTH * 0.65));
$y = $this->HEIGHT * 0.12;
}
$this->labelEvent($x, $y, "Inlet closes", $tag, abs($this->ic));
$x = $this->WIDTH * 0.13;
$y = $this->HEIGHT * 0.2;
if ($isBTDC || ($this->ic < 30)) {
$x = $this->WIDTH * 0.1;
$y = $this->HEIGHT * 0.3;
}
$tmp = (is_numeric($this->id)) ? ($this->id - $this->ic) : $this->ic;
$this->labelEvent($this->WIDTH-$x, $y, "Inlet opens", "ABDC", 180-$tmp);
}
}
function labelEvent ($x0, $y0, $lab1, $st2, $angle)
{
$fnt = 2;
$dx = ($x0 - (ImageFontWidth($fnt) * strlen($lab1)) / 2);
$dy = $y0 - ImageFontHeight($fnt);
Imagestring($this->image, $fnt, $dx, $dy, $lab1, $this->TITLE_COLOR);
$lab2 = sprintf('%.1f%s %s', $angle, $this->degChar, $st2);
$dx = ($x0 - (ImageFontWidth($fnt) * strlen($lab2)) / 2);
Imagestring($this->image, $fnt, $dx, $y0, $lab2, $this->TITLE_COLOR);
}
function drawRot ($x0, $y0)
{
$xtick = $this->WIDTH / 30;
ImageLine($this->image,
$x0 - $xtick, $y0, $x0 + $xtick, $y0,
$this->AXIS_COLOR);
$ytick = $this->HEIGHT / 28;
ImageLine($this->image,
$x0, $y0 + $ytick, $x0, $y0 - (2 * $ytick),
$this->AXIS_COLOR);
$xrad = $this->WIDTH / 8;
$yrad = $this->HEIGHT / 8;
ImageArc($this->image,
$x0, $y0, $xrad, $yrad, 270, 180, $this->AXIS_COLOR);
$ahx = $xrad / 8;
$ahy = $yrad / 15;
$dy = ($yrad / 2) - ($ahy / 2);
$points = array(($x0 - $ahx), ($y0 - $dy),
($x0 + $ahx), ($y0 - $dy - $ahy),
($x0 + $ahx), ($y0 - $dy + $ahy),
($x0 - $ahx), ($y0 - $dy));
ImageFilledPolygon($this->image, $points, 4, $this->AXIS_COLOR);
$lab = "TDC";
$fnt = 3;
$tx = ($x0 - (ImageFontWidth($fnt) * strlen($lab)) / 2);
$ty = ($y0 - ( .6 * $yrad) - ImageFontHeight($fnt));
Imagestring($this->image, $fnt, $tx, $ty, $lab, $this->TITLE_COLOR);
if (($this->eo > 0) && ($this->to> 0) ) {
$x = $this->WIDTH * 0.092;
$y = $this->HEIGHT * 0.93;
$this->labelEvent($x, $y, 'Blowdown:', '', ($this->to - $this->eo));
}
}
}
?>
