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<%pre> |
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#include <tntdb/connect.h> |
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#include <tntdb/connection.h> |
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#include <tntdb/result.h> |
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#include <tntdb/row.h> |
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#include "gd-cpp/gdpp.h" |
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#include <gdfonts.h> |
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#include <sstream> |
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</%pre> |
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<%config> |
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dburl; |
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</%config> |
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<%args> |
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int id; |
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</%args> |
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<{ |
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reply.setHeader("Cache-Control", "no-cache, must-revalidate"); // Http/1.1 |
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reply.setHeader("Expires", "Mon, 26 Jul 1997 05:00:00 GMT"); //date in the past |
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GD::Image image; |
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image.Create( GD::Size(600,360)); |
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//Black color scheme |
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//GD::TrueColor decoration(45,95,0); |
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//GD::TrueColor text(200,200,200); |
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//GD::TrueColor line(255,0,0); |
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//White color scheme |
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int white = image.ColorAllocate(255,255,255); |
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int decoration = image.ColorAllocate(60,60,60); |
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int text = image.ColorAllocate(0,0,0); |
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int line = image.ColorAllocate(255,0,0); |
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image.Fill( GD::Point(1,1), white ); |
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image.String(gdFontSmall, 250,5, "Temperature graph", text); |
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image.String(gdFontSmall, 200,18, "Latest 20 samples, in degrees Celcius", text); |
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for (int i=0; i<11; ++i) |
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{ |
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std::stringstream marker; |
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marker << (100- (i*10)); |
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int y = (i*30) + 40; |
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image.Line( 30, y, 590, y, decoration); |
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image.String(gdFontSmall, 5, y-7, marker.str().c_str(), text); |
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} |
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///////////////////////////////////////////////// |
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tntdb::Connection conn = tntdb::connectCached(dburl); |
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std::stringstream query; |
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query << "SELECT temperature FROM ( "; |
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query << " SELECT messagenr,temperature FROM logtable "; |
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query << " WHERE installationnr = " << id << " "; |
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query << " ORDER BY messagenr DESC LIMIT 20 "; |
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query << ") query "; |
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query << "ORDER BY messagenr ASC"; |
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tntdb::Result res = conn.select(query.str()); |
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GD::Point previous; |
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for (unsigned int i=0; i<res.size(); ++i) |
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{ |
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int current = res[i].getInt(0); |
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int x = (i*28) + 45; |
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int y = ((100-current) * 3) + 40; |
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//image.FilledArc( GD::Point(x,y), GD::Size(3,3), 0, 360, line.Int(), gdPie); |
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image.FilledRectangle( GD::Point(x-1,y-1), GD::Point(x+1,y+1), line ); |
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if (i>0) |
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{ |
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image.Line( GD::Point(x,y), previous, line); |
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} |
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previous = GD::Point(x,y); |
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} |
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////////////////////////////////////////////////// |
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// echo the image to the browser... |
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reply.setContentType("image/png"); |
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int size; |
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unsigned char* ptr = (unsigned char*) image.Png(&size,1); |
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for (int i=0; i<size; ++i) |
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reply.out() << ptr[i]; |
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gdFree(ptr); |
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}> |
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