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lamanita

Gráficos

Por , em PHP

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reinaldo.rmo    0

reinaldo.rmo
Postado

Este exemplo é muito bom pra quem precisa entender como gerar graficos no php. É de um livro que tenho.

 

Espero que te ajude.

 

Reinaldo

 

-----------------------------------------------------------------------------

 

pollsetup.sql - configura o banco de dados poll

 

create database poll;

use poll;

create table poll_results (

candidate varchar(30),

num_votes int

);

insert into poll_results values

('John Smith', 0),

('Mary Jones', 0),

('Fred Bloggs', 0)

;

grant all privileges

on poll.*

to poll@localhost

identified by 'poll';

 

-------------------------------------------------------------------------

 

vote.html - onde os usuarios podem votar

 

<html>

<head>

<title>Polling</title>

<head>

<body>

<h1>Pop Poll</h1>

<p>Who will you vote for in the election?</p>

<form method="post" action="show_poll.php">

<input type="radio" name="vote" value="John Smith">John Smith<br />

<input type="radio" name="vote" value="Mary Jones">Mary Jones<br />

<input type="radio" name="vote" value="Fred Bloggs">Fred Bloggs<br /><br />

<input type="submit" value="Show results">

</form>

</body>

 

---------------------------------------------------------------------

 

show_poll.php - arquivo responsavel por gerar o grafico

 

<?php

/*******************************************

Database query to get poll info

*******************************************/

 

// get vote from form

$vote=$HTTP_POST_VARS['vote'];

 

// log in to database

if (!$db_conn = @mysql_connect('localhost', 'poll', 'poll'))

{

echo 'Could not connect to db<br />';

exit;

};

@mysql_select_db('poll');

 

if (!empty($vote)) // if they filled the form out, add their vote

{

$vote = addslashes($vote);

$query = "update poll_results

set num_votes = num_votes + 1

where candidate = '$vote'";

if(!($result = @mysql_query($query, $db_conn)))

{

echo 'Could not connect to db<br />';

exit;

}

};

 

// get current results of poll, regardless of whether they voted

$query = 'select * from poll_results';

if(!($result = @mysql_query($query, $db_conn)))

{

echo 'Could not connect to db<br />';

exit;

}

$num_candidates = mysql_num_rows($result);

 

// calculate total number of votes so far

$total_votes=0;

while ($row = mysql_fetch_object ($result))

{

$total_votes += $row->num_votes;

}

mysql_data_seek($result, 0); // reset result pointer

 

 

/*******************************************

Initial calculations for graph

*******************************************/

// set up constants

putenv('GDFONTPATH=C:\WINNT\Fonts');

$width=500; // width of image in pixels - this will fit in 640x480

$left_margin = 50; // space to leave on left of image

$right_margin= 50; // ditto right

$bar_height = 40;

$bar_spacing = $bar_height/2;

$font = 'arial';

$title_size= 16; // point

$main_size= 12; // point

$small_size= 12; // point

$text_indent = 10; // position for text labels on left

 

// set up initial point to draw from

$x = $left_margin + 60; // place to draw baseline of the graph

$y = 50; // ditto

$bar_unit = ($width-($x+$right_margin)) / 100; // one "point" on the graph

 

// calculate height of graph - bars plus gaps plus some margin

$height = $num_candidates * ($bar_height + $bar_spacing) + 50;

 

/*******************************************

Set up base image

*******************************************/

// create a blank canvas

$im = imagecreate($width,$height);

 

// Allocate colors

$white=ImageColorAllocate($im,255,255,255);

$blue=ImageColorAllocate($im,0,64,128);

$black=ImageColorAllocate($im,0,0,0);

$pink = ImageColorAllocate($im,255,78,243);

 

$text_color = $black;

$percent_color = $black;

$bg_color = $white;

$line_color = $black;

$bar_color = $blue;

$number_color = $pink;

 

// Create "canvas" to draw on

ImageFilledRectangle($im,0,0,$width,$height,$bg_color);

 

// Draw outline around canvas

ImageRectangle($im,0,0,$width-1,$height-1,$line_color);

 

// Add title

$title = 'Poll Results';

$title_dimensions = ImageTTFBBox($title_size, 0, $font, $title);

$title_length = $title_dimensions[2] - $title_dimensions[0];

$title_height = abs($title_dimensions[7] - $title_dimensions[1]);

$title_above_line = abs($title_dimensions[7]);

$title_x = ($width-$title_length)/2; // center it in x

$title_y = ($y - $title_height)/2 + $title_above_line; // center in y gap

ImageTTFText($im, $title_size, 0, $title_x, $title_y,

$text_color, $font, $title);

 

// Draw a base line from a little above first bar location

// to a little below last

ImageLine($im, $x, $y-5, $x, $height-15, $line_color);

 

/*******************************************

Draw data into graph

*******************************************/

// Get each line of db data and draw corresponding bars

while ($row = mysql_fetch_object ($result))

{

if ($total_votes > 0)

$percent = intval(round(($row->num_votes/$total_votes)*100));

else

$percent = 0;

 

// display percent for this value

ImageTTFText($im, $main_size, 0, $width-30, $y+($bar_height/2),

$percent_color, $font, $percent.'%');

if ($total_votes > 0)

$right_value = intval(round(($row->num_votes/$total_votes)*100));

else

$right_value = 0;

 

// length of bar for this value

$bar_length = $x + ($right_value * $bar_unit);

 

// draw bar for this value

ImageFilledRectangle($im, $x, $y-2, $bar_length, $y+$bar_height, $bar_color);

 

// draw title for this value

ImageTTFText($im, $main_size, 0, $text_indent, $y+($bar_height/2),

$text_color, $font, "$row->candidate");

 

// draw outline showing 100%

ImageRectangle($im, $bar_length+1, $y-2,

($x+(100*$bar_unit)), $y+$bar_height, $line_color);

 

// display numbers

ImageTTFText($im, $small_size, 0, $x+(100*$bar_unit)-50, $y+($bar_height/2),

$number_color, $font, $row->num_votes.'/'.$total_votes);

 

// move down to next bar

$y=$y+($bar_height+$bar_spacing);

}

 

/*******************************************

Display image

*******************************************/

Header('Content-type: image/png');

ImagePng($im);

 

 

/*******************************************

Clean up

*******************************************/

ImageDestroy($im);

?>

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