Add x/y offset option

For unusual printer coordinate systems
#380

Author: teachingtechYT

js/createform.js

@@ -157,11 +157,12 @@ var startGcode = /*html*/ `<h4>Additional start gcode</h4>
             </div>`;
 
 var bedDims =  /*html*/ `<h4>Bed dimensions</h4>
-            <p>Inputting the correct number will attempt to move the print into the centre of the bed. If the 0,0 at centre button is checked for a delta, also enter your bed diameter. Please check the gcode to ensure it will fit on your bed.</p>
+            <p>Inputting the correct number will attempt to move the print into the centre of the bed. If the 0,0 at centre button is checked for a delta, also enter your bed diameter. Please check the gcode to ensure it will fit on your bed. For unusual 3D printers, apply X/Y offsets to shift the gcode on the build platform. 99.9% of users will leave this on 0,0. Please ensure you check a gcode preview before printing if you use this feature.</p>
             <label>0,0 at centre of bed (most deltas):<input name="centre" type="checkbox" onchange="displayCustom();" value="centre"></label>
             <span class="XY"><label>Bed X dimension (mm): <input type="number" name="bedx" value="100" min="100" max="600" step="1"></label>
             <label>Bed Y dimension (mm): <input type="number" name="bedy" value="100" min="100" max="600" step="1"></label><br /></span>
-            <span class="dia"><label>Bed diameter dimension (mm): <input type="number" name="beddia" value="100" min="100" max="600" step="1"></label></span>`;
+            <span class="dia"><label>Bed diameter dimension (mm): <input type="number" name="beddia" value="100" min="100" max="600" step="1"></label></span>
+            <label>X offset (mm): <input type="number" name="offsetx" value="0" min="-1000" max="1000" step="1"></label> <label>Y offset (mm): <input type="number" name="offsety" value="0" min="-1000" max="1000" step="1"></label>`;
 
 var extraMargin = /*html*/ `<p>You may add extra margin for clearing bed clips, etc. Caution! If this is too large on small printers the squares will overlap. You may also use a negative value to space the squares further apart. Make sure to preview the gcode before printing!</p>
             <label>Extra margin from edge (mm): <input type="number" name="margin" value="0" min="0" max="100" step="1"></label>`;

js/gcodeprocessing.js

@@ -130,6 +130,8 @@ function processGcode(formName) {
         var bedX = Math.round((formName.bedx.value-120)/2);
         var bedY = Math.round((formName.bedy.value-120)/2);
     }
+    var offsetX = formName.offsetx.value;
+    var offsetY = formName.offsety.value;
     var abl = formName.abl.value;
     var customStart = formName.startgcode.value;
     var customEnd = formName.endgcode.value;
@@ -331,14 +333,16 @@ function processGcode(formName) {
             firstlayerArray.forEach(function(index, item){
                 if(firstlayerArray[item].search(/X/) > -1){
                     var value = parseFloat(firstlayerArray[item].match(regexp)[0].substring(1)) + offsets[i*2];
+                    value += parseFloat(offsetX);
                     firstlayerArray[item] = firstlayerArray[item].replace(regexp, "X"+String(value.toFixed(4)));
                 }
             });
             var regexp = /Y[0-9\.]+/;
             firstlayerArray.forEach(function(index, item){
                 if(firstlayerArray[item].search(/Y/) > -1){
                     var value = parseFloat(firstlayerArray[item].match(regexp)[0].substring(1)) + offsets[i*2+1];
-                    firstlayerArray[item] = firstlayerArray[item].replace(regexp, "Y"+String(value.toFixed(4)))
+                    value += parseFloat(offsetY);
+                    firstlayerArray[item] = firstlayerArray[item].replace(regexp, "Y"+String(value.toFixed(4)));
                 }
             });
             square = firstlayerArray.join("\n");
@@ -411,13 +415,15 @@ function processGcode(formName) {
             gcodeArray.forEach(function(index, item){
                 if(gcodeArray[item].search(/X/) > -1){
                     var value = parseFloat(gcodeArray[item].match(regexp)[0].substring(1)) - 50;
+                    value += parseFloat(offsetX);
                     gcodeArray[item] = gcodeArray[item].replace(regexp, "X"+String(value.toFixed(4)));
                 }
             });
             var regexp = /Y[0-9\.]+/;
             gcodeArray.forEach(function(index, item){
                 if(gcodeArray[item].search(/Y/) > -1){
                     var value = parseFloat(gcodeArray[item].match(regexp)[0].substring(1)) - 50;
+                    value += parseFloat(offsetY);
                     gcodeArray[item] = gcodeArray[item].replace(regexp, "Y"+String(value.toFixed(4)))
                 }
             });
@@ -429,6 +435,7 @@ function processGcode(formName) {
                 gcodeArray.forEach(function(index, item){
                     if(gcodeArray[item].search(/X/) > -1){
                         var value = parseFloat(gcodeArray[item].match(regexp)[0].substring(1)) + bedX;
+                        value += parseFloat(offsetX);
                         gcodeArray[item] = gcodeArray[item].replace(regexp, "X"+String(value.toFixed(4)));
                     }
                 });
@@ -440,6 +447,7 @@ function processGcode(formName) {
                 gcodeArray.forEach(function(index, item){
                     if(gcodeArray[item].search(/Y/) > -1){
                         var value = parseFloat(gcodeArray[item].match(regexp)[0].substring(1)) + bedY;
+                        value += parseFloat(offsetY);
                         gcodeArray[item] = gcodeArray[item].replace(regexp, "Y"+String(value.toFixed(4)))
                     }
                 });