Tutorial > Observer Canvas

The ObserversCanvas class for spectra is the equivalent of the ViewerCanvas class for molecules. In essence, there is procedural difference between declaring canvases that display structures and those that display spectra, except that one type displays molecules and the other displays spectra. Just like the molecule canvases, the spectrum canvases are fully customizable.

The ObserverCanvas class is the most basic canvas for spectra. All spectrum canvases can be used by following four general steps:

  1. Construction
  2. Specify Canvas Settings
  3. Override Spectrum Settings
  4. Load Spectrum

1. Construction

Just like the ViewerCanvas, the ObserverCanvas constructor takes only 3 parameters: name, width and height. The constructor will automatically create the canvas with the name and dimensions you give it. The ObserverCanvas class is a child of the SpectrumCanvas class, which in turn, is a child of the Canvas class.

new ChemDoodle.ObserverCanvas(name, width, height);

2. Specify Canvas Settings

The constructor will automatically place the canvas on the page. After the canvas has been created, its settings may be changed by accessing its Canvas.styles object. The spectrum styles are different from those of atoms and bonds, but the concept is the same. Complete information on all styles is provided in the API.

3. Override Spectrum Settings

Unlike molecules, where most of the settings to define how molecules are displayed have nothing to do with the actual molecule data, the same is not true for spectra. You may want to override several properties of the spectrum, such as the title, the units of the axes and the domain of the plot. You can do this by reading the spectrum into a local variable followed by modifying any of the spectrum's properties, listed here:

  • title - The title of the spectrum.
  • xUnit - The units of the domain, to be displayed under the x-axis.
  • yUnit - The units of the range, to be displayed next to the y-axis.
  • minX - The start of the plot domain.
  • maxX - The end of the plot domain.
  • dataDisplay - This is an Array of Object. Each object describes an item in the list of data items to be displayed on the top left of the spectrum. This data can be manually specified or referenced from the JCAMP header. More information is provided in the API.

4. Load Spectrum

The last step is to load the spectrum. The Spectrum.loadSpectrum() function serves this purpose, and requires a Spectrum data structure. The loadSpectrum() function is analogous to the loadMolecule() function.

Note that JCAMP files can be very large. You do not want to be manually inserting these files into the HTML page. A backend script, such as PHP or JSP will help you load large files from your server to your webpages.

Examples

A classic style:

<script>
  let observerIR = new ChemDoodle.ObserverCanvas('observerIR', 400, 200);
  observerIR.styles.plots_showGrid=true;
  observerIR.styles.plots_flipXAxis = true;
  observerIR.styles.text_font_families[0] = "Times New Roman";
  observerIR.styles.text_font_families[1] = "Times";
  observerIR.styles.text_font_families[2] = 'serif';
  let spectrumJcampFile = '##TITLE=POLYETHYLENE\n##JCAMP-DX=4.24\n##DATA TYPE=INFRARED SPECTRUM\n##DATE=03/30/90\n##TIME=10:47:11\n##OWNER=(c) by Peter Lampen 12.12.91\n##ORIGIN=Peter Lampen\n##SPECTROMETER/DATA SYSTEM=SPECTRAFILE-IR / XXIR  \n##DATA PROCESSING=Dir\n##XUNITS=1/CM\n##YUNITS=TRANSMITTANCE\n##XFACTOR=0.125\n##YFACTOR=0.00312499\n##FIRSTX=400.000000\n##LASTX=4000.000000\n##NPOINTS=1801\n##MAXY=99.999750\n##FIRSTY=97.7404\n##DELTAX=2.000000\n##XYDATA=(X++(Y..Y))\n3200C1276%Sj05Sl3Sm2SJ44So5Sn7SJ8SK7Sq3SK3SO2Sj4SJ28SL0SM1SQ0SK7SM4S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\n9788B9897kSPSQSRTJ0SJ2SJ3SJ5SPSJ0SOSJ1SPSKS%SkSmSj0Sj7Sk2Sk8Tl8Sm0S\n10188B9832l2Sl0Sl7Sn0Sn9So7Sq3Sr2Tj03Sj25Sj32Sj17Sr3Sn6Sk7S%SL3SM9S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\n14441C0947%Sj2Sj0Sk1Sj2Sj1Sk2Sj4SmS%SlSJ8Sj0SRSj0SpSj0SnSmSj7SNSkSlT\n14825C0799%SMSjSMTJSjS%SkSQSPSMSmSoS%SrSk4Sl3Sm8Sn2Sn4Sl5Sj3SJSJ9SK5S\n15241C0594J4SRSJ0SRSLSmSj1SJSkSj0SKSoSmSkSjU%SnSLSQSPSMS%SPSOTJ1SPS\n15705C0654J0SJ2SJ0SJ4SJ0SKSJ0SlSMSlSmSnSj0Sj4Sj0Sj6Sj1Sk3Tl1Sl7Sm4S\n16056C0492n3So5Sq9Sj10Sj19Sq3Sj3SJ0SL0SM5SM0SL6SK9SK8SK6SK4SL0SK5SK8S\n16360C0311K1SK6SK5SK3SJ6SJ3SJ9SJ3SJ4SJ3SQSJ0SJSQSLSQSkSlSkSjTrSnSpS\n16744C0502oSpSrSoTj3SrSoSjTrSmSnSkS%SoSjSmSnSkSj0Sj1Sj2Sj0Sj8Sj2TmS\n17192C0311kSLSQSRSOSNSJ3SOS%SJSjSJSnSj4Sj2SqSj0SpSoSj1SmSjSnSrS%SmT\n17623C0260KSnSrSlS%SLSlSoSj1SnSLSRSOSQS%SmSj3Sk7Sk8Sk3Sj2SMSNS%SLSMS\n18039C0158kSnSj1SnSj3Sk6Sk3Sk0Sl0Sl1Tj9SrSj4Sj2SrSpSnSj0SqSrSj4Sj2S\n18407B9833rSj1SpSJSpSoSmSj7SoSMS%Sj4Sk2SmSJ4SJ2SJ1SOSK3SMSOSLS%Sm4S\n18791B9766l8SJ10SJ25SR9SQ5SM7SK9SJ9SoSl1Sl7Sl5Sm3Sn1Sm9Sn1Sl1Sl0Sj5S\n19095B9863j0TLSoSjSoSkSmSpTOSnSk0SrSj5SkSJ6TJ9TJ8SJ3SPSOSMSPSlSLS%S\n19558B9893jSkSqSrTpSmSk0SmSj6Sj9Sk1Sl2Sm9Sl1SqSMSrSmSlTj0SJSpSoSj5S\n19974B9601kSj1SpSj9SqSj6Sj5Sj7Sk8Sj9Sl6Sm3Sn5Sn3Sl7Sl1Sj2SQSJ3SJ5SRS\n20310B9237qSk6Sn0Sn4Sn0Sl6Sk1SrSk2Sj7Sk3Sk0Sl2Sk7Sk4Sl7Sl8Sk1Sn1Sl9S\n20630B8632l3Sm5Sl5Sm9So5So0Sm3Sm7Sn7Sn3Sm8Sn7Sl9Sm8So4So2Sp2So5Sq2S\n20934B7608r5Sp6Tq7Sq6Sj06Sr9Sq8Sp5Sm3Sj2SkSNSK7SNS%Sj4Sk3Sl7Sm4Sk2S\n21269B6660l1Sj0Sj2SMSkSK3SL4SN7SL6SJ8SM9SJ5SL9SK5SL3TK1SK2SJ3Tj2Sl5S\n21621B6993m3Sk5Sm8Sl6Sm7Tl4Sn1Tn7Sn8So6Sp9Sn9Sm0Sl0Sj4SoSpSJSRSK2SJ3S\n21989B6240MSl3Sk7Sm8So1Sn9Sp0Sn9Sr5Sq0Sj09Sj00Sj30Sj46Sj58Sj93Sj95S\n22261B4681k17Sk31Sk54Sk59Sk86Sk97Sk86Sk88Sl00Sl12Sl20Sl34Sl49Sl64Sl95S\n22501B0189m64Sm76Sn26Sn61So32Sp32Sp92Sr41Sj059Sj216Sj406Sj708Sk029S\n22709G647k175Sk242Sj504Sp52So54S%XJ213SP47SJ040SP47SL63SK82SJ74SJ27S\n23012E013k49Sl91Sm93So50Sn16Sm60Sl42Sm00Sn75Sq1SJ87SK35Sj40So16SM52S\n23252I74j62Sm92SO17So17SL93SK61SJ64SK16Sj29Sk8SL36SM1So2Sm04SQ9SJ57S\n23508A354p6SN85SM67SQ33SQ41SO18SM73SL24SL06SN03SN19SP66SJ035SJ252SJ483S\n23748A1283J564SJ577SJ459SJ328SJ149SR88SQ20SP07SN90SN18SM38SL68SL29S\n23956B3118L04SK50SK24SJ94SJ80SJ64SJ40SJ31SJ30SJ06SJ12SJ14SQ8TQ6SR4S\n24212B5523P9SR8SQ8SJ03SJ04SR7SJ18SR7SJ08SQ7SR2SQ5SQ3SO3SO1SO4SN4SM8S\n24500B7052M4SN7SM4SM0SM2SK8SL9SL0SK0SL9SM9SM0SN1SQ1SQ6SR4SQ3SR9SQ6S\n24803B8104O9SN7SN1SL9SN0SL7TK6SK1SJ0SL3SK9SJ8S%SRSK2SJ2SJ3SjSLSJ3SJS\n25155B8653jSOSNSOSkSRSOSpSLSlSkSOS%SJ4SkSMSJ1Sj6SnSNSKSPSnSJSJ0SPSkS\n25587B8710LSJSLSRSJ1SJSOS%Sj3SJ3S%SJ2SQSj1SKSOSkSKSkSj4SMSJ3Sk1SjSJS\n25987B8741J1SpSrSjSoSpSkSOSlSj0SqSj2SMSjSlSrSoSOSmTj0TJ3SqSj3SNS%Sl4S\n26435B8619KSmSj6SOSoSk1SNSmSk0SoSj6SJ0SrSj3SqSj3Sj0Sj3Sj1SlSj7Sj9SJS\n26802B8434j9Sj6Sj2SlSj3Tk2Sj5SpSNSkSj5SRUrSkSJSqSNTkSpSJ2SqSj2SqSJ3S\n27250B8309mTpSj1Sj6SnSrSPSkSj9Sj1Sj6SpSjSrSj4SoSLSKSnSj2SkS%Sj4SJ8S\n27650B8165NSqSjSJSlS%SpSkSNSnSj3SjSK2Sj3Sj7SnSLSmTnSk3SLSMSlSJ4Sk7S\n28066B8081nSRS%SLSmSk2SnSNSLSl2SJ0Sk1SOSlSMSkSMSj7Sj9SOSNSm4SJ1SJ6S\n28449B7989l2Sk4SNSnSl4Sj3SK0Sj4Sj7Sk5SoSj1Uk2Sl8Sk0So0Sk5Sj01Sj23Sj35S\n28801B7287j11So3S%SL5SN8SO3SP5SM2SJ1SM0SL0Sj1SK2Sk2SK9SRSn0Sj9Sn5Sk3S\n29121B7347m3Sj8Sk9SPSJ2SO0Sj4Sj9SO7Sj4SpSrSJ0SrSk6SR0Sp7SMSO8So6SKS\n29457B7336l1Sj4Sl8SN4Sm8Sk4S%SK8Sl0SnSJ7SPSj2SRSj7SL5Sn1Sj8SJ3SqSJ9S\n29793B7222l7SL1SoSl9SPSkSL5Sl1SJ0Sr1SQ3Sn6SJ3Sl0SN0Sq2SkSK0SK4Sl0Sm2S\n30129B7047K8SmSJ8Sm7SkSm4SLSL9Sn2SKSMSlSm5SQSJSK8Sp8SOSK6Sj01SN8Sj7S\n30480B6875l5Sl2Sm1SJ11Sj15SN1SMSp0SL3SmSLSj1Sk7Sj6SP6Sj8Sm8SJ4Sl4SrS\n30800B6707m5SP1SQ6Sj06SjSm7Sl1SP4Sr4Sl7SJ14Sr5SM1Sn9Sl5SQ4Sk3Sl0SN5S\n31104B6629q5SL5SJSlS%SJ9Sj2SJ1SnSk6SnSJSJ5Sn0SpSM5SJ8Sn9SM4SK3Sm0SnS\n31456B6544M9SK6SK1Sl1Sj6SJ3SK3Sj5Sj0SjSM6Sl0Sj2Sl8SK0SK8Sj8Sl8Sk0TqS\n31792B6513K1SQSj6Sl7SJ6SpSj0SK5Sk7SM9Sj2Sk7SJ0S\n31999@\n##END=\n';
  let spectrum = ChemDoodle.readJCAMP(spectrumJcampFile);
  observerIR.loadSpectrum(spectrum);
</script>

Focusing on a peak:

<script>
  let observerSeptet = new ChemDoodle.ObserverCanvas('observerSeptet', 200, 200);
  observerSeptet.setBackgroundImage('/img/cwc/backgrounds/nmrTube.png');
  observerSeptet.styles.plots_color = '#3000FF';
  observerSeptet.styles.plots_width = 3;
  observerSeptet.styles.plots_showYAxis = false;
  observerSeptet.styles.plots_flipXAxis = true;
  observerSeptet.styles.scale = 10;
  observerSeptet.styles.text_font_size = 16;
  observerSeptet.styles.text_font_families[0] = "Comic Sans MS";
  observerSeptet.styles.text_font_families[1] = "Chalkboard";
  observerSeptet.styles.text_font_families[2] = "Marker Felt";
  observerSeptet.styles.text_font_families[3] = "cursive";
  observerSeptet.styles.text_font_families[4] = 'Sans Serif';
  observerSeptet.styles.text_color = 'white';
  let spectrumJcampFile = '##TITLE= 2-methyl-1-propanol\n##JCAMP-DX= 5.00 $$From Command Line Converter 1.0\n##DATA TYPE= NMR Spectrum\n##DATA CLASS=  XYDATA\n\n##ORIGIN= Exported from Command Line Converter 1.0\n##OWNER= SVB\n##$URL= http://wwwchem.uwimona.edu.jm:1104/software/jcampdx.html\n##SPECTROMETER/DATA SYSTEM= NUTS EXPORT\n##.OBSERVE FREQUENCY= 300.149506\n##.OBSERVE NUCLEUS= ^1H\n##INSTRUMENTAL PARAMETERS= 1H\n##XUNITS= PPM\n##YUNITS= ARBITRARY UNITS\n##XFACTOR= 0.0000035013\n##YFACTOR= 3.5404570000\n##FIRSTX=   0.449892\n##FIRSTY= 9201.000000\n##LASTX=   3.951200\n##NPOINTS= 2153\n##MAXY= 3534337.000000\n##MINY= -6120.000000\n##DELTAX=   0.001627\n##XYDATA= (X++(Y..Y))\n128492B598Pp2%M9o4J02m0P6j8m7l9K5J93j29J83j42p7Q1MK6K3lP8m5l8P0j02\n141054B699N2Q3%p2J9J77j11j59R4n1J05j00J77p0k7K9l3J13j6P1J24J8r4k1J21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\n342719b58N6j41L0Q1O3j25l5k0L5l8N5j59J22j38n7N4%j7Q7j63K7P4j60nk0P3\n354787e79j12P6p2j12N3L8K4l1k1LK9L3p8m3M7o1J06r1Q2j59K0O2Jo4P4q8R4o1\n367824h30OP3L1j07n9O6o6K1J7J02k0j30K0j2J28p1O7j13L5M5j00K33p4o4K9j95\n379892i68J76MNM4n6j4J06j19p1J31J00j27K3q1k0K9J06m0L6n0M2j15J30N3%J1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\n556471I31J35J12p5m4j98K3%P4K4K1J8Q5q0J37o3M9k41l3j06L9p1L2J15l0j39\n568103G15Q8J35j7Q8L8j03j65j63Q2j32p8n0K0n2K41M97M33K38N88K30j50m72\n578312B011l49k55p3J46pj8J11J90N9M9N6p2J08N7Q2n1K4j12P5M1j92J08lO6L7\n589944B088J7P3J68P4J34k5K10O3K16J65L89K42M26K50P77R66J340J427K641N746\n599224A7387R509J2804J8471K4606J9181P289l462m194q877j8879k4163j8109\n604793C1563j0599m738k053j279o99m62p75j82L9M68m08j54r48o72p64n41n32\n612686G264m16m58l89m45k45k52k42k09j33k24k01k63k41k12k72r4k13J3L58l10\n621995B816j04L2j60P4N26j14j45j14J31M0j94p8r2J22J42j06J45l3m1O0J3k25\n632222B695Q2k01j00qJ02l8j77m3l0K0j56n0L7O0j03p3p3k3q9j0j71N1r3k2j57\n643836A430O2j54N4l1o5P5m1L3j87J00m0N9j63M1k%j81j6O5j24L7%m1R1j05O3\n655904I60k4J8J60L55P16J890j721r34j78k2j05l0l7J7l5J18K66K88R44K338N76\n665667E560l623n49j47l5j05p3k2M9P0J2N4K39O84J366j723o66l1p8J8j42N4j2\n675904I00K8j74O5n3n2n4o9K6r6M3N1K2qq4M0p1J00j73K8Jn0J07J2K9l9l4R6j79\n688913D12J4M8j30P7NJ9l1q7P4K5qQn7l0J17j79J16%j9r9N2k7K0Rk2K2L0J0j14\n702386B55O6J1p6L1k2j00O0o8l2Q9L3j04M5M5j02Nj8Q0o4j6m5k0j23N0p7l7j40\n714919b74k08K59Q72k90l3qo2n7j03k7j8L8j47m6k44P01K86r9p9q6O5r9j76J41\n726086C06Q9r6p2O4N8jm8rj8L6m2m9N4r6MP5L4j51N6%J03j14k4J1l8J12K6n0M5\n739559B65j39J36p0nJ07j56L7K9l6J12r9J83q0r3L3M9n3K7r4J37l1q7O2oj11L6\n751627A53m6P6N5Mm5QO5L9j43JO7q8l5P1l3l6J80Lj21P5n5P5J2n9o2l4K2J48j4\n765128B83k0n8j26J48q8P0j0K6j43J27qN2N4j41O1J13K6J04j97nn2j38J69j32\n776267A15L6j05R4M7NK8K2k20k0J81j46N6M6J23j81Q8O8o3l7M8J86j48l8Lj1J48\n788335C25q1r1J09k6K6J7j24J6q2K0NK4j7P7L7M9J62k96rL8n3oJ3j5p0N6j19N0\n801372C5Q3M62o60L64o6K8P2p2N3k2Rl8N2k9p2M%j52K05n9k2MonL6j32M1j0R5\n814845A98r9nR4p0PP2n5M4%j1K9k8L4j24N3lJ10l4l2j35K03j99J85j02Q8Kq8l1\n827853A03orJ9m3N3J25j20M7j6l2M4K4p5J3P0q8J05j90R9J9J10p5Jl0j9J11k06\n840386C4J33M7J5j49J32N7j3j00n4Rl2R6j01j9J32jj03J7P6m5M3m1R1j91m0J07\n852483A00p3M5O3r2P7jL9k7o1J07j78J73Nn9M8j10M0q1J21j51Q4O9N6k06J97q5\n864562A00QO9r1l3Q7K5j07Pk9N8p5J42m6Q7j42K8j9pRk7jM3j6K4J38m5q3l3J32\n878035B03j99J8jm7NL6m1K21k07q0L5R4op0Q5m2j57J36L9j7KK8N6o0L5j6l3O5\n891032H2r7l3M6L4RO4k02N8J10J9m2qJ7j26O3M0P0J26L08P79K20j117j13m1l9\n902664B27j8%L6r7J19J17J57N72J070j761j35Q9k11j08J5J14r9R8M4Mk01N4L8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\n1068086B251%o2m8O2j05k6Q0l2J2n6P6j33l5Q8m2rJ36j10j6j05O5j0JJ1m6j31J75\n1080648A991j56O3Q7jm2r2L8JL2n5J56r3j18J19m9o5J2l6k3PJ26k08M1J66o3m2\n1092726A796m0N5r7k3K9Q9rJ1l8oo7P9o4L6N3j58J0O2J0m4l9L8J06J3j12rl1j83\n1105724A467O6J45Nj73RJ38N6k04O6k6oon1O7M6p9J2k3J8pn3R8L0oq7O7M6j93J43\n1119197A565k9Po7J92J3k07P8mj3k0q4O6K3p8J42q2Pj73J47N6\n##END=\n';
  let spectrum = ChemDoodle.readJCAMP(spectrumJcampFile);
  spectrum.title = 'A Septet';
  spectrum.xUnit = '\u03B4';
  spectrum.minX = 1.57;
  spectrum.maxX = 1.96;
  observerSeptet.loadSpectrum(spectrum);
</script>

Showing an integration line:

<script>
  let observerNMR = new ChemDoodle.ObserverCanvas('observerNMR', 400, 200);
  observerNMR.styles.plots_showYAxis = false;
  observerNMR.styles.plots_showIntegration = true;
  observerNMR.styles.plots_flipXAxis = true;
  let spectrumJcampFile = '##TITLE= PAMOIC ACID in DMSO\n##JCAMP-DX= 5.00 $$From Command Line Converter 1.0\n##DATA TYPE= NMR Spectrum\n##DATA CLASS=  XYDATA\n\n##ORIGIN= Exported from Command Line Converter 1.0\n##OWNER= SVB\n##$URL= http://wwwchem.uwimona.edu.jm:1104/software/jcampdx.html\n##SPECTROMETER/DATA SYSTEM= NUTS EXPORT\n##.OBSERVE FREQUENCY= 300.149506\n##.OBSERVE NUCLEUS= ^1H\n##INSTRUMENTAL PARAMETERS= 1H\n##XUNITS= PPM\n##YUNITS= ARBITRARY UNITS\n##XFACTOR= 0.0000043007\n##YFACTOR= 1.5165470000\n##FIRSTX=   4.517287\n##FIRSTY= 17730.000000\n##LASTX=   8.817900\n##NPOINTS= 5288\n##MAXY= 1505971.000000\n##MINY= -10576.000000\n##DELTAX=   0.000813\n##XYDATA= 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  let spectrum = ChemDoodle.readJCAMP(spectrumJcampFile);
  spectrum.title = 'Pamoic Acid in DMSO with Integration';
  spectrum.xUnit = 'ppm';
  spectrum.minX = 4.5;
  spectrum.maxX = 8.8;
  observerNMR.loadSpectrum(spectrum);
</script>

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