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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Blockly Demo: Graph</title>
<script src="https://www.google.com/jsapi"></script>
<script src="../../blockly_compressed.js"></script>
<script src="../../blocks_compressed.js"></script>
<script src="../../javascript_compressed.js"></script>
<script src="../../msg/js/en.js"></script>
<style>
body {
background-color: #fff;
font-family: sans-serif;
}
h1 {
font-weight: normal;
font-size: 140%;
}
#funcText {
margin-top: 1em;
margin-left: 1.5em;
font-family: sans-serif;
}
#funcText>img {
height: 3px;
width: 15px;
vertical-align: middle;
margin-right: .5em;
}
#y1 {
background-color: #36c;
}
</style>
</head>
<body>
<h1><a href="https://developers.google.com/blockly/">Blockly</a> >
<a href="../index.html">Demos</a> > Graph</h1>
<p>This is a demo of giving instant feedback as blocks are changed.</p>
<p>→ More info on <a href="https://developers.google.com/blockly/installation/code-generators#realtime_generation">Realtime generation</a>...</p>
<table>
<tr>
<td>
<div id="visualization" style="width: 400px"></div>
</td>
<td>
<div id="blocklyDiv" style="height: 400px"></div>
</td>
</tr>
</table>
<div id="funcText">
<img id="y1" src="../../media/1x1.gif">
...
</div>
<xml id="toolbox" style="display: none">
<category name="Math">
<block type="math_number"></block>
<block type="math_arithmetic"></block>
<block type="math_single"></block>
<block type="math_trig"></block>
<block type="math_constant"></block>
<block type="math_number_property"></block>
<block type="math_round"></block>
<block type="math_modulo"></block>
<block type="math_constrain">
<value name="LOW">
<block type="math_number">
<field name="NUM">1</field>
</block>
</value>
<value name="HIGH">
<block type="math_number">
<field name="NUM">100</field>
</block>
</value>
</block>
<block type="math_random_int">
<value name="FROM">
<block type="math_number">
<field name="NUM">1</field>
</block>
</value>
<value name="TO">
<block type="math_number">
<field name="NUM">100</field>
</block>
</value>
</block>
<block type="math_random_float"></block>
</category>
<category name="Variables">
<block type="graph_get_x"></block>
</category>
<category name="Logic">
<block type="logic_compare"></block>
<block type="logic_operation"></block>
<block type="logic_negate"></block>
<block type="logic_boolean"></block>
<block type="logic_ternary"></block>
</category>
</xml>
<xml id="startBlocks" style="display: none">
<block type="graph_set_y" deletable="false" x="100" y="100">
<value name="VALUE">
<block type="math_arithmetic">
<field name="OP">POWER</field>
<value name="A">
<block type="graph_get_x"></block>
</value>
<value name="B">
<block type="math_number">
<field name="NUM">2</field>
</block>
</value>
</block>
</value>
</block>
</xml>
<script>
// Load the Google Chart Tools Visualization API and the chart package.
if (typeof google == 'object') {
google.load('visualization', '1', {packages: ['corechart']});
} else {
alert('Unable to load Google\'s chart API.\n' +
'Are you connected to the Internet?');
}
// Define the custom blocks and their JS generators.
Blockly.Blocks['graph_get_x'] = {
// x variable getter.
init: function() {
this.setHelpUrl(Blockly.Msg.VARIABLES_GET_HELPURL);
this.setColour(330);
this.appendDummyInput()
.appendField('x');
this.setOutput(true, 'Number');
this.setTooltip(Blockly.Msg.VARIABLES_GET_TOOLTIP);
}
};
Blockly.JavaScript['graph_get_x'] = function(block) {
// x variable getter.
return ['x', Blockly.JavaScript.ORDER_ATOMIC];
};
Blockly.Blocks['graph_set_y'] = {
// y variable setter.
init: function() {
this.setHelpUrl(Blockly.Msg.VARIABLES_SET_HELPURL);
this.setColour(330);
this.appendValueInput('VALUE')
.appendField('y =')
.setCheck('Number');
this.setTooltip(Blockly.Msg.VARIABLES_SET_TOOLTIP);
}
};
Blockly.JavaScript['graph_set_y'] = function(block) {
// y variable setter.
var argument0 = Blockly.JavaScript.valueToCode(block, 'VALUE',
Blockly.JavaScript.ORDER_ASSIGNMENT) || '';
return 'y = ' + argument0 + ';';
};
/**
* Create a namespace for the application.
*/
var Graph = {};
/**
* Main Blockly workspace.
* @type {Blockly.WorkspaceSvg}
*/
Graph.workspace = null;
/**
* Cached copy of the function string.
* @type {?string}
* @private
*/
Graph.oldFormula_ = null;
/**
* Drawing options for the Chart API.
* @type {!Object}
* @private
*/
Graph.options_ = {
//curveType: 'function',
width: 400, height: 400,
chartArea: {left: '10%', width: '85%', height: '85%'}
};
/**
* Visualize the graph of y = f(x) using Google Chart Tools.
* For more documentation on Google Chart Tools, see this linechart example:
* https://developers.google.com/chart/interactive/docs/gallery/linechart
*/
Graph.drawVisualization = function() {
var formula = Blockly.JavaScript.workspaceToCode(Graph.workspace);
if (formula === Graph.oldFormula_) {
// No change in the formula, don't recompute.
return;
}
Graph.oldFormula_ = formula;
// Create and populate the data table.
var data = google.visualization.arrayToDataTable(Graph.plot(formula));
// Create and draw the visualization, passing in the data and options.
new google.visualization.LineChart(document.getElementById('visualization')).
draw(data, Graph.options_);
// Create the "y = ..." label. Find the relevant part of the code.
formula = formula.substring(formula.indexOf('y = '));
formula = formula.substring(0, formula.indexOf(';'));
var funcText = document.getElementById('funcText');
funcText.replaceChild(document.createTextNode(formula), funcText.lastChild);
};
/**
* Plot points on the function y = f(x).
* @param {string} code JavaScript code.
* @return {!Array.<!Array>} 2D Array of points on the graph.
*/
Graph.plot = function(code) {
// Initialize a table with two column headings.
var table = [];
var y;
// TODO: Improve range and scale of graph.
for (var x = -10; x <= 10; x = Math.round((x + 0.1) * 10) / 10) {
try {
eval(code);
} catch (e) {
y = NaN;
}
if (!isNaN(y)) {
// Prevent y from being displayed inconsistently, some in decimals, some
// in scientific notation, often when y has accumulated rounding errors.
y = Math.round(y * Math.pow(10, 14)) / Math.pow(10, 14);
table.push([x, y]);
}
}
// Add column heading to table.
if (table.length) {
table.unshift(['x', 'y']);
} else {
// If the table is empty, add a [0, 0] row to prevent graph error.
table.unshift(['x', 'y'], [0, 0]);
}
return table;
};
/**
* Force Blockly to resize into the available width.
*/
Graph.resize = function() {
var width = Math.max(window.innerWidth - 440, 250);
document.getElementById('blocklyDiv').style.width = width + 'px';
};
/**
* Initialize Blockly and the graph. Called on page load.
*/
Graph.init = function() {
Graph.workspace = Blockly.inject('blocklyDiv',
{media: '../../media/',
toolbox: document.getElementById('toolbox')});
Blockly.Xml.domToWorkspace(Graph.workspace,
document.getElementById('startBlocks'));
// When Blockly changes, update the graph.
Graph.workspace.addChangeListener(Graph.drawVisualization);
};
window.addEventListener('load', Graph.init);
window.addEventListener('resize', Graph.resize);
</script>
</body>
</html>
|
