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OpenBoard/resources/library/interactive/Graphme.wgt/JavaScript/jQuery/calculate.js

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/*
* 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/>.
*/
function addChar(input, character) {
if(input.value == null || input.value == "0")
input.value = character
else
input.value += character
}
function cos(form) {
form.display.value = Math.cos(form.display.value);
}
function sin(form) {
form.display.value = Math.sin(form.display.value);
}
function tan(form) {
form.display.value = Math.tan(form.display.value);
}
function sqrt(form) {
form.display.value = Math.sqrt(form.display.value);
}
function ln(form) {
form.display.value = Math.log(form.display.value);
}
function exp(form) {
form.display.value = Math.exp(form.display.value);
}
function deleteChar(input) {
input.value = input.value.substring(0, input.value.length - 1)
}
function changeSign(input) {
if(input.value.substring(0, 1) == "-")
input.value = input.value.substring(1, input.value.length)
else
input.value = "-" + input.value
}
function square(form) {
form.display.value = eval(form.display.value) * eval(form.display.value)
}
function checkNum(str) {
for (var i = 0; i < str.length; i++) {
var ch = str.substring(i, i+1)
if (ch < "0" || ch > "9") {
if (ch != "/" && ch != "*" && ch != "+" && ch != "-" && ch != "."
&& ch != "(" && ch!= ")") {
$("#display").text("ERROR");
return false
}
}
}
return true
}