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Plot.php
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Wed, Oct 1, 1:22 PM

Plot.php
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<?php
/* Libchart - PHP chart library
* Copyright (C) 2005-2007 Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
defined('FULL_PATH') or die('restricted access!');
/**
* The plot holds graphical attributes, and is responsible for computing the layout of the graph.
* The layout is quite simple right now, with 4 areas laid out like that:
* (of course this is subject to change in the future).
*
* output area------------------------------------------------|
* | (outer padding) |
* | image area--------------------------------------------| |
* | | (title padding) | |
* | | title area----------------------------------------| | |
* | | |-------------------------------------------------| | |
* | | | |
* | | (graph padding) (caption padding) | |
* | | graph area----------------| caption area---------| | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | |-------------------------| |--------------------| | |
* | | | |
* | |-----------------------------------------------------| |
* | |
* |----------------------------------------------------------|
*
* All area dimensions are known in advance , and the optional logo is drawn in absolute coordinates.
*
* @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
* Created on 27 july 2007
*/
class LibchartPlot {
// Style properties
protected $title;
protected $logoFileName;
// Outer area, whose dimension is the same as the PNG returned
protected $outputArea;
// Outer padding surrounding the whole image, everything outside is blank
protected $outerPadding;
// Coordinates of the area inside the outer padding
protected $imageArea;
// Fixed title height in pixels
protected $titleHeight;
// Padding of the title area
protected $titlePadding;
// Coordinates of the title area
protected $titleArea;
// True if the plot has a caption
protected $hasCaption;
// Ratio of graph/caption in width
protected $graphCaptionRatio;
// Padding of the graph area
protected $graphPadding;
// Coordinates of the graph area
protected $graphArea;
// Padding of the caption area
protected $captionPadding;
// Coordinates of the caption area
protected $captionArea;
/**
* Text writer.
*/
protected $text;
/**
* Color palette.
*/
protected $palette;
/**
* GD image
*/
protected $img;
/**
* Drawing primitives
*/
protected $primitive;
protected $backGroundColor;
protected $textColor;
/**
* Constructor of Plot.
*
* @param integer width of the image
* @param integer height of the image
*/
public function __construct($width, $height) {
$this->width = $width;
$this->height = $height;
$this->text = new LibchartText();
$this->palette = new LibchartPalette();
// Default layout
$this->outputArea = new LibchartRectangle(0, 0, $width - 1, $height - 1);
$this->outerPadding = new LibchartPadding(5);
$this->titleHeight = 26;
$this->titlePadding = new LibchartPadding(5);
$this->hasCaption = false;
$this->graphCaptionRatio = 0.50;
$this->graphPadding = new LibchartPadding(50);
$this->captionPadding = new LibchartPadding(15);
}
/**
* Compute the area inside the outer padding (outside is white).
*/
private function computeImageArea() {
$this->imageArea = $this->outputArea->getPaddedRectangle($this->outerPadding);
}
/**
* Compute the title area.
*/
private function computeTitleArea() {
$titleUnpaddedBottom = $this->imageArea->y1 + $this->titleHeight + $this->titlePadding->top + $this->titlePadding->bottom;
$titleArea = new LibchartRectangle(
$this->imageArea->x1,
$this->imageArea->y1,
$this->imageArea->x2,
$titleUnpaddedBottom - 1
);
$this->titleArea = $titleArea->getPaddedRectangle($this->titlePadding);
}
/**
* Compute the graph area.
*/
private function computeGraphArea() {
$titleUnpaddedBottom = $this->imageArea->y1 + $this->titleHeight + $this->titlePadding->top + $this->titlePadding->bottom;
$graphArea = null;
if ($this->hasCaption) {
$graphUnpaddedRight = $this->imageArea->x1 + ($this->imageArea->x2 - $this->imageArea->x1) * $this->graphCaptionRatio
+ $this->graphPadding->left + $this->graphPadding->right;
$graphArea = new LibchartRectangle(
$this->imageArea->x1,
$titleUnpaddedBottom,
$graphUnpaddedRight - 1,
$this->imageArea->y2
);
} else {
$graphArea = new LibchartRectangle(
$this->imageArea->x1,
$titleUnpaddedBottom,
$this->imageArea->x2,
$this->imageArea->y2
);
}
$this->graphArea = $graphArea->getPaddedRectangle($this->graphPadding);
}
/**
* Compute the caption area.
*/
private function computeCaptionArea() {
$graphUnpaddedRight = $this->imageArea->x1 + ($this->imageArea->x2 - $this->imageArea->x1) * $this->graphCaptionRatio
+ $this->graphPadding->left + $this->graphPadding->right;
$titleUnpaddedBottom = $this->imageArea->y1 + $this->titleHeight + $this->titlePadding->top + $this->titlePadding->bottom;
$captionArea = new LibchartRectangle(
$graphUnpaddedRight,
$titleUnpaddedBottom,
$this->imageArea->x2,
$this->imageArea->y2
);
$this->captionArea = $captionArea->getPaddedRectangle($this->captionPadding);
}
/**
* Compute the layout of all areas of the graph.
*/
public function computeLayout() {
$this->computeImageArea();
$this->computeTitleArea();
$this->computeGraphArea();
if ($this->hasCaption) {
$this->computeCaptionArea();
}
}
/**
* Creates and initialize the image.
*/
public function createImage() {
$this->img = imagecreatetruecolor($this->width, $this->height);
$this->primitive = new LibchartPrimitive($this->img);
$this->backGroundColor = new LibchartColor(255, 255, 255);
$this->textColor = new LibchartColor(0, 0, 0);
// White background
imagefilledrectangle($this->img, 0, 0, $this->width - 1, $this->height - 1, $this->backGroundColor->getColor($this->img));
//imagerectangle($this->img, $this->imageArea->x1, $this->imageArea->y1, $this->imageArea->x2, $this->imageArea->y2, $this->palette->red->getColor($this->img));
}
/**
* Print the title to the image.
*/
public function printTitle() {
$yCenter = $this->titleArea->y1 + ($this->titleArea->y2 - $this->titleArea->y1) / 2;
$this->text->printCentered($this->img, $yCenter, $this->textColor, $this->title, $this->text->fontCondensedBold);
}
/**
* Print the logo image to the image.
*/
public function printLogo() {
@$logoImage = imageCreateFromPNG($this->logoFileName);
if ($logoImage) {
imagecopymerge($this->img, $logoImage, 2 * $this->outerPadding->left, $this->outerPadding->top, 0, 0, imagesx($logoImage), imagesy($logoImage), 100);
}
}
/**
* Renders to a file or to standard output.
*
* @param fileName File name (optional)
*/
public function render($fileName) {
if (isset($fileName)) {
imagepng($this->img, $fileName);
} else {
imagepng($this->img);
}
}
/**
* Sets the title.
*
* @param string New title
*/
public function setTitle($title) {
$this->title = $title;
}
/**
* Sets the logo image file name.
*
* @param string New logo image file name
*/
public function setLogoFileName($logoFileName) {
$this->logoFileName = $logoFileName;
}
/**
* Return the GD image.
*
* @return GD Image
*/
public function getImg() {
return $this->img;
}
/**
* Return the palette.
*
* @return palette
*/
public function getPalette() {
return $this->palette;
}
/**
* Return the text.
*
* @return text
*/
public function getText() {
return $this->text;
}
/**
* Return the primitive.
*
* @return primitive
*/
public function getPrimitive() {
return $this->primitive;
}
/**
* Return the outer padding.
*
* @param integer Outer padding value in pixels
*/
public function getOuterPadding() {
return $outerPadding;
}
/**
* Set the outer padding.
*
* @param integer Outer padding value in pixels
*/
public function setOuterPadding($outerPadding) {
$this->outerPadding = $outerPadding;
}
/**
* Return the title height.
*
* @param integer title height
*/
public function setTitleHeight($titleHeight) {
$this->titleHeight = $titleHeight;
}
/**
* Return the title padding.
*
* @param integer title padding
*/
public function setTitlePadding($titlePadding) {
$this->titlePadding = $titlePadding;
}
/**
* Return the graph padding.
*
* @param integer graph padding
*/
public function setGraphPadding($graphPadding) {
$this->graphPadding = $graphPadding;
}
/**
* Set if the graph has a caption.
*
* @param boolean graph has a caption
*/
public function setHasCaption($hasCaption) {
$this->hasCaption = $hasCaption;
}
/**
* Set the caption padding.
*
* @param integer caption padding
*/
public function setCaptionPadding($captionPadding) {
$this->captionPadding = $captionPadding;
}
/**
* Set the graph/caption ratio.
*
* @param integer caption padding
*/
public function setGraphCaptionRatio($graphCaptionRatio) {
$this->graphCaptionRatio = $graphCaptionRatio;
}
/**
* Return the graph area.
*
* @return graph area
*/
public function getGraphArea() {
return $this->graphArea;
}
/**
* Return the caption area.
*
* @return caption area
*/
public function getCaptionArea() {
return $this->captionArea;
}
/**
* Return the text color.
*
* @return text color
*/
public function getTextColor() {
return $this->textColor;
}
}

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