add reconstruction plugin

plugins/jspsych-reconstruction.js

@@ -0,0 +1,113 @@
+/**
+ * jspsych-reconstruction
+ * a jspsych plugin for a reconstruction task where the subject recreates
+ * a stimulus from memory
+ *
+ * Josh de Leeuw
+ *
+ * documentation: docs.jspsych.org
+ *
+ */
+
+(function($) {
+  jsPsych['reconstruction'] = (function() {
+
+    var plugin = {};
+
+    plugin.create = function(params) {
+
+      params = jsPsych.pluginAPI.enforceArray(params, ['data']);
+
+      var n_trials = (typeof params.starting_value == 'undefined') ? 1 : params.starting_value.length
+
+      var trials = [];
+      for (var i = 0; i < n_trials; i++) {
+        trials.push({
+          starting_value: (typeof params.starting_value == 'undefined') ? [0.5] : params.starting_value[i],
+          stim_function: params.stim_function,
+          step_size: params.step_size || 0.05,
+          key_increase: params.key_increase || 'h',
+          key_decrease: params.key_decrease || 'g'
+        });
+      }
+      return trials;
+    };
+
+    plugin.trial = function(display_element, trial) {
+
+      // if any trial variables are functions
+      // this evaluates the function and replaces
+      // it with the output of the function
+      trial = jsPsych.pluginAPI.normalizeTrialVariables(trial, ['stim_function']);
+
+      // current param level
+      var param = trial.starting_value;
+
+      // set-up key listeners
+      var after_response = function(info){
+        // get new param value
+        if(info.key == key_increase) {
+          param = param + step_size;
+        } else if(info.key == key_decrease) {
+          param = param - step_size;
+        }
+        param = Math.max(Math.min(1,param),0);
+
+        // refresh the display
+        draw(param);
+      }
+
+      // listen for responses
+      var key_listener = jsPsych.pluginAPI.getKeyboardResponse(after_response, [trial.key_increase, trial.key_decrease], 'date', true);
+
+      // draw first iteration
+      draw(param);
+
+      function draw(param){
+        display_element.html('');
+
+        display_element.append($('<div id="jspsych-reconstruction-stim-container"></div>'));
+
+        $('#jspsych-reconstruction-stim-container').html(trial.stim_function(param));
+
+        // add submit button
+        display_element.append($('<button>', {
+          'id': 'jspsych-survey-text-next',
+          'class': 'jspsych-survey-text'
+        }));
+        $("#jspsych-survey-text-next").html('Submit Answers');
+        $("#jspsych-survey-text-next").click(
+
+      }
+
+      function endTrial(){
+        // measure response time
+        var endTime = (new Date()).getTime();
+        var response_time = endTime - startTime;
+
+        // save data
+        jsPsych.data.write($.extend({}, {
+          "rt": response_time,
+          "final_value": param,
+          "start_value": trial.starting_value
+        }, trial.data));
+
+        display_element.html('');
+
+        // next trial
+        if (trial.timing_post_trial > 0) {
+          setTimeout(function() {
+            jsPsych.finishTrial();
+          }, trial.timing_post_trial);
+        } else {
+          jsPsych.finishTrial();
+        }
+      }
+
+      var startTime = (new Date()).getTime();
+
+    };
+
+    return plugin;
+  })();
+})(jQuery);