PHP CairoLinearGradient примеры использования

Пример #1

Файл: operator-clear.php Проект: jamesan/cairo

function set_gradient_pattern($x, $y)
{
    global $con, $width, $height;
    $pat = new CairoLinearGradient($x, $y, $x + $width, $y + $height);
    $pat->addColorStopRgba(0.2, 1, 0, 0, 1);
    $pat->addColorStopRgba(0.8, 1, 0, 0, 0.0);
    $con->setSource($pat);
}

Пример #2

Файл: cairo_oo.php Проект: Adeelgill/livehelperchat

 /**
  * Get SVG style definition
  *
  * Returns a string with SVG style definitions created from color, 
  * fillstatus and line thickness.
  * 
  * @param ezcGraphColor $color Color
  * @param mixed $filled Filled
  * @param float $thickness Line thickness.
  * @return string Formatstring
  */
 protected function getStyle(ezcGraphColor $color, $filled = true, $thickness = 1.0)
 {
     switch (true) {
         case $color instanceof ezcGraphLinearGradient:
             $pattern = new CairoLinearGradient($color->startPoint->x, $color->startPoint->y, $color->endPoint->x, $color->endPoint->y);
             $pattern->addColorStopRgba(0, $color->startColor->red / 255, $color->startColor->green / 255, $color->startColor->blue / 255, 1 - $color->startColor->alpha / 255);
             $pattern->addColorStopRgba(1, $color->endColor->red / 255, $color->endColor->green / 255, $color->endColor->blue / 255, 1 - $color->endColor->alpha / 255);
             $this->context->setSource($pattern);
             $this->context->fill();
             break;
         case $color instanceof ezcGraphRadialGradient:
             $pattern = new CairoRadialGradient(0, 0, 0, 0, 0, 1);
             $pattern->addColorStopRgba(0, $color->startColor->red / 255, $color->startColor->green / 255, $color->startColor->blue / 255, 1 - $color->startColor->alpha / 255);
             $pattern->addColorStopRgba(1, $color->endColor->red / 255, $color->endColor->green / 255, $color->endColor->blue / 255, 1 - $color->endColor->alpha / 255);
             // Scale pattern, and move it to the correct position
             $matrix = CairoMatrix::multiply($move = CairoMatrix::initTranslate(-$color->center->x, -$color->center->y), $scale = CairoMatrix::initScale(1 / $color->width, 1 / $color->height));
             $pattern->setMatrix($matrix);
             $this->context->setSource($pattern);
             $this->context->fill();
             break;
         default:
             $this->context->setSourceRgba($color->red / 255, $color->green / 255, $color->blue / 255, 1 - $color->alpha / 255);
             break;
     }
     // Set line width
     $this->context->setLineWidth($thickness);
     // Set requested fill state for context
     if ($filled) {
         $this->context->fillPreserve();
     }
 }

Пример #3

Файл: sphere.php Проект: jamesan/cairo

<?php

$Surface = new CairoImageSurface(0, 256, 256);
$ctx = new CairoContext($Surface);
$ctx->setAntialias(0);
$ctx->setFillRule(0);
$ctx->scale(256 / 1.0, 256 / 1.0);
$pat = new CairoLinearGradient(0.0, 0.0, 0.0, 1.0);
$pat->addColorStopRgba(1, 0, 0, 0, 1);
$pat->addColorStopRgba(0, 1, 1, 1, 1);
$ctx->rectangle(0, 0, 1, 1);
$ctx->setSource($pat);
$ctx->fill();
$pat = new CairoRadialGradient(0.45, 0.4, 0.1, 0.4, 0.4, 0.5);
$pat->addColorStopRgba(0, 1, 1, 1, 1);
$pat->addColorStopRgba(1, 0, 0, 0, 1);
$ctx->setSource($pat);
$ctx->arc(0.5, 0.5, 0.3, 0, 2 * 3.14);
$ctx->fill();
$check = $ctx->getTarget();
$check->writeToPng(dirname(__FILE__) . '/sphere.png');

Пример #4

Файл: clip-operator.php Проект: jamesan/cairo

$width = 16;
$height = 16;
$pad = 2;
$noperator = 1 + CairoOperator::SATURATE - CairoOperator::CLEAR;
$imagewidth = $noperator * ($width + $pad) + $pad;
$imageheight = 4 * ($height + $pad) + $pad;
$sur = new CairoImageSurface(CairoFormat::ARGB32, $imagewidth, $imageheight);
$con = new CairoContext($sur);
$con->selectFontFace("Bitstream Vera Sans");
$con->setFontSize(0.9 * $height);
for ($i = 0; $i < 4; $i++) {
    for ($op = CairoOperator::CLEAR; $op < $noperator; $op++) {
        $x = $op * ($width + $pad) + $pad;
        $y = $i * ($height + $pad) + $pad;
        $con->save();
        $pat = new CairoLinearGradient($x + $width, $y, $x, $y + $height);
        $pat->addColorStopRgba(0.2, 0, 0, 1, 1);
        $pat->addColorStopRgba(0.8, 0, 0, 1, 0);
        $con->setSource($pat);
        $con->rectangle($x, $y, $width, $height);
        $con->fill();
        $con->setOperator($op);
        $con->setSourceRgb(1, 0, 0);
        $con->moveTo($x, $y);
        $con->lineTo($x + $width, $y);
        $con->lineTo($x, $y + $height);
        $con->clip();
        switch ($i) {
            case 0:
                $wi = floor($width * 0.9);
                $he = floor($height * 0.9);

Пример #5

Файл: gradient-alpha.php Проект: jamesan/cairo

<?php

$sur = new CairoImageSurface(CairoFormat::ARGB32, 10, 10);
$con = new CairoContext($sur);
$pat = new CairoLinearGradient(0, -10, 0, 10);
$pat->addColorStopRgba(0, 1, 0, 0, 1);
$pat->addColorStopRgba(1, 0, 0, 1, 0.5);
$con->setSource($pat);
$con->paint();
$sur->writeToPng(dirname(__FILE__) . "/gradient-alpha-php.png");

Пример #6

Файл: linear-gradient-reflect.php Проект: jamesan/cairo

<?php

$width = 50;
$height = 50;
$sur = new CairoImageSurface(CairoFormat::ARGB32, $width, $height);
$con = new CairoContext($sur);
$con->setSourceRgb(0.5, 0.5, 0.5);
$con->paint();
$con->save();
$pattern = new CairoLinearGradient(0, 0, 10.0, 0);
$pattern->addColorStopRgb(0.0, 0.0, 0.0, 1.0);
$pattern->addColorStopRgb(1.0, 1.0, 0.0, 0.0);
$pattern->setExtend(CairoExtend::REFLECT);
$con->setSource($pattern);
$con->rectangle(0.0, 0.0, $width, $height);
$con->fill();
$con->restore();
$sur->writeToPng(dirname(__FILE__) . "/linear-gradient-reflect-php.png");
?>