本文整理汇总了PHP中imageColorExactAlpha函数的典型用法代码示例。如果您正苦于以下问题：PHP imageColorExactAlpha函数的具体用法？PHP imageColorExactAlpha怎么用？PHP imageColorExactAlpha使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了imageColorExactAlpha函数的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的PHP代码示例。
示例1: imagesmoothcircle
/**
* Credits goes to an anonymous at http://usphp.com/manual/ro/function.imageantialias.php
*/
function imagesmoothcircle(&$img, $cx, $cy, $cr, $color)
{
$ir = $cr;
$ix = 0;
$iy = $ir;
$ig = 2 * $ir - 3;
$idgr = -6;
$idgd = 4 * $ir - 10;
$fill = imageColorExactAlpha($img, $color['R'], $color['G'], $color['B'], 0);
imageLine($img, $cx + $cr - 1, $cy, $cx, $cy, $fill);
imageLine($img, $cx - $cr + 1, $cy, $cx - 1, $cy, $fill);
imageLine($img, $cx, $cy + $cr - 1, $cx, $cy + 1, $fill);
imageLine($img, $cx, $cy - $cr + 1, $cx, $cy - 1, $fill);
$draw = imageColorExactAlpha($img, $color['R'], $color['G'], $color['B'], 42);
imageSetPixel($img, $cx + $cr, $cy, $draw);
imageSetPixel($img, $cx - $cr, $cy, $draw);
imageSetPixel($img, $cx, $cy + $cr, $draw);
imageSetPixel($img, $cx, $cy - $cr, $draw);
while ($ix <= $iy - 2) {
if ($ig < 0) {
$ig += $idgd;
$idgd -= 8;
$iy--;
} else {
$ig += $idgr;
$idgd -= 4;
}
$idgr -= 4;
$ix++;
imageLine($img, $cx + $ix, $cy + $iy - 1, $cx + $ix, $cy + $ix, $fill);
imageLine($img, $cx + $ix, $cy - $iy + 1, $cx + $ix, $cy - $ix, $fill);
imageLine($img, $cx - $ix, $cy + $iy - 1, $cx - $ix, $cy + $ix, $fill);
imageLine($img, $cx - $ix, $cy - $iy + 1, $cx - $ix, $cy - $ix, $fill);
imageLine($img, $cx + $iy - 1, $cy + $ix, $cx + $ix, $cy + $ix, $fill);
imageLine($img, $cx + $iy - 1, $cy - $ix, $cx + $ix, $cy - $ix, $fill);
imageLine($img, $cx - $iy + 1, $cy + $ix, $cx - $ix, $cy + $ix, $fill);
imageLine($img, $cx - $iy + 1, $cy - $ix, $cx - $ix, $cy - $ix, $fill);
$filled = 0;
for ($xx = $ix - 0.45; $xx < $ix + 0.5; $xx += 0.2) {
for ($yy = $iy - 0.45; $yy < $iy + 0.5; $yy += 0.2) {
if (sqrt(pow($xx, 2) + pow($yy, 2)) < $cr) {
$filled += 4;
}
}
}
$draw = imageColorExactAlpha($img, $color['R'], $color['G'], $color['B'], 100 - $filled);
imageSetPixel($img, $cx + $ix, $cy + $iy, $draw);
imageSetPixel($img, $cx + $ix, $cy - $iy, $draw);
imageSetPixel($img, $cx - $ix, $cy + $iy, $draw);
imageSetPixel($img, $cx - $ix, $cy - $iy, $draw);
imageSetPixel($img, $cx + $iy, $cy + $ix, $draw);
imageSetPixel($img, $cx + $iy, $cy - $ix, $draw);
imageSetPixel($img, $cx - $iy, $cy + $ix, $draw);
imageSetPixel($img, $cx - $iy, $cy - $ix, $draw);
}
}示例2: imageSmoothArcDrawSegment
function imageSmoothArcDrawSegment(&$img, $cx, $cy, $a, $b, $color, $start, $stop, $seg)
{
// Originally written from scratch by Ulrich Mierendorff, 06/2006
// Rewritten and improved, 04/2007, 07/2007
// Optimized circle version: 03/2008
// Please do not use THIS function directly. Scroll down to imageSmoothArc(...).
$fillColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], $color[3]);
switch ($seg) {
case 0:
$xp = +1;
$yp = -1;
$xa = 1;
$ya = -1;
break;
case 1:
$xp = -1;
$yp = -1;
$xa = 0;
$ya = -1;
break;
case 2:
$xp = -1;
$yp = +1;
$xa = 0;
$ya = 0;
break;
case 3:
$xp = +1;
$yp = +1;
$xa = 1;
$ya = 0;
break;
}
for ($x = 0; $x <= $a; $x += 1) {
$y = $b * sqrt(1 - $x * $x / ($a * $a));
$error = $y - (int) $y;
$y = (int) $y;
$diffColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error);
imageSetPixel($img, $cx + $xp * $x + $xa, $cy + $yp * ($y + 1) + $ya, $diffColor);
imageLine($img, $cx + $xp * $x + $xa, $cy + $yp * $y + $ya, $cx + $xp * $x + $xa, $cy + $ya, $fillColor);
}
for ($y = 0; $y < $b; $y += 1) {
$x = $a * sqrt(1 - $y * $y / ($b * $b));
$error = $x - (int) $x;
$x = (int) $x;
$diffColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error);
imageSetPixel($img, $cx + $xp * ($x + 1) + $xa, $cy + $yp * $y + $ya, $diffColor);
}
}示例3: _getColor
protected function _getColor(Image_3D_Color $color, $alpha = 1.0)
{
$values = $color->getValues();
$values[0] = (int) round($values[0] * 255);
$values[1] = (int) round($values[1] * 255);
$values[2] = (int) round($values[2] * 255);
$values[3] = (int) round((1 - (1 - $values[3]) * $alpha) * 127);
if ($values[3] > 0) {
// Tranzparente Farbe allokieren
$color = imageColorExactAlpha($this->_image, $values[0], $values[1], $values[2], $values[3]);
if ($color === -1) {
// Wenn nicht Farbe neu alloziieren
$color = imageColorAllocateAlpha($this->_image, $values[0], $values[1], $values[2], $values[3]);
}
} else {
// Deckende Farbe allozieren
$color = imageColorExact($this->_image, $values[0], $values[1], $values[2]);
if ($color === -1) {
// Wenn nicht Farbe neu alloziieren
$color = imageColorAllocate($this->_image, $values[0], $values[1], $values[2]);
}
}
return $color;
}示例4: imageSmoothArcDrawSegment
function imageSmoothArcDrawSegment(&$img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $start, $stop, $seg)
{
// Originally written from scratch by Ulrich Mierendorff, 06/2006
// Rewritten and improved, 04/2007, 07/2007
// Please do not use THIS function directly. Scroll down to imageSmoothArc(...).
$fillColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], $color[3]);
$xStart = abs($a * cos($start));
$yStart = abs($b * sin($start));
$xStop = abs($a * cos($stop));
$yStop = abs($b * sin($stop));
$dxStart = 0;
$dyStart = 0;
$dxStop = 0;
$dyStop = 0;
if ($xStart != 0) {
$dyStart = $yStart / $xStart;
}
if ($xStop != 0) {
$dyStop = $yStop / $xStop;
}
if ($yStart != 0) {
$dxStart = $xStart / $yStart;
}
if ($yStop != 0) {
$dxStop = $xStop / $yStop;
}
if (abs($xStart) >= abs($yStart)) {
$aaStartX = true;
} else {
$aaStartX = false;
}
if ($xStop >= $yStop) {
$aaStopX = true;
} else {
$aaStopX = false;
}
//$xp = +1; $yp = -1; $xa = +1; $ya = 0;
for ($x = 0; $x < $a; $x += 1) {
/*$y = $b * sqrt( 1 - ($x*$x)/($a*$a) );
$error = $y - (int)($y);
$y = (int)($y);
$diffColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error );*/
$_y1 = $dyStop * $x;
$_y2 = $dyStart * $x;
if ($xStart > $xStop) {
$error1 = $_y1 - (int) $_y1;
$error2 = 1 - $_y2 + (int) $_y2;
$_y1 = $_y1 - $error1;
$_y2 = $_y2 + $error2;
} else {
$error1 = 1 - $_y1 + (int) $_y1;
$error2 = $_y2 - (int) $_y2;
$_y1 = $_y1 + $error1;
$_y2 = $_y2 - $error2;
}
/*
if ($aaStopX)
$diffColor1 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error1 );
if ($aaStartX)
$diffColor2 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error2 );
*/
if ($seg == 0 || $seg == 2) {
$i = $seg;
if (!($start > $i * M_PI / 2 && $x > $xStart)) {
if ($i == 0) {
$xp = +1;
$yp = -1;
$xa = +1;
$ya = 0;
} else {
$xp = -1;
$yp = +1;
$xa = 0;
$ya = +1;
}
if ($stop < ($i + 1) * (M_PI / 2) && $x <= $xStop) {
$diffColor1 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error1);
$y1 = $_y1;
if ($aaStopX) {
imageSetPixel($img, $cx + $xp * $x + $xa, $cy + $yp * ($y1 + 1) + $ya, $diffColor1);
}
} else {
$y = $b * sqrt(1 - $x * $x / ($a * $a));
$error = $y - (int) $y;
$y = (int) $y;
$diffColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error);
$y1 = $y;
if ($x < $aaAngleX) {
imageSetPixel($img, $cx + $xp * $x + $xa, $cy + $yp * ($y1 + 1) + $ya, $diffColor);
}
}
if ($start > $i * M_PI / 2 && $x <= $xStart) {
$diffColor2 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error2);
$y2 = $_y2;
if ($aaStartX) {
imageSetPixel($img, $cx + $xp * $x + $xa, $cy + $yp * ($y2 - 1) + $ya, $diffColor2);
}
} else {
//.........这里部分代码省略.........