add spiral layer start point option

src/kiri/core/consts.js

@@ -27,6 +27,7 @@ const LISTS = {
         { name: "center" },
         { name: "origin" },
         { name: "random" },
+        { name: "spiral" },
     ],
     infill: [
         { name: "none" },

src/kiri/mode/fdm/prepare.js

@@ -41,6 +41,7 @@ export async function fdm_prepare(widgets, settings, update) {
         zneg = 0,
         zoff = 0,
         zmin = 0,
+        zmax = 0,
         shield,
         output = [],
         layerout = [];
@@ -224,6 +225,7 @@ export async function fdm_prepare(widgets, settings, update) {
         }
         for (let slice of widget.slices) {
             zmin = Math.min(zmin, slice.z);
+            zmax = Math.max(zmax, slice.z);
             if (!slice.supports) {
                 continue;
             }
@@ -469,6 +471,8 @@ export async function fdm_prepare(widgets, settings, update) {
     let lastExt;
     let lastOut;
 
+    print.zmax = zmax;
+
     // walk cake layers bottom up
     for (let layer of cake) {
         // track purge blocks generated for each layer
@@ -1474,6 +1478,13 @@ function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
 
             // control of layer start point
             switch (process.sliceLayerStart) {
+                case "spiral": {
+                    let center = top.poly.bounds.center();
+                    let angle = (Math.PI * 2) * (slice.z / print.zmax);
+                    let x = center.x + Math.cos(angle)*10000;
+                    let y = center.y + Math.sin(angle)*10000;
+                    startPoint = newPoint(x,y,startPoint.z);
+                    } break;
                 case "last":
                     break;
                 case "random":

web/kiri/lang/en.js

@@ -848,7 +848,7 @@ self.lang['en-us'] = {
 
     // FDM ADVANCED
     ad_menu:        "expert",
-    ad_rdst_s:      "retract dist",
+    ad_rdst_s:      "retract distance",
     ad_rdst_l:      ["amount to retract filament","for long moves. in millimeters"],
     ad_rrat_s:      "retract rate",
     ad_rrat_l:      ["speed of filament","retraction in mm/s"],
@@ -866,7 +866,7 @@ self.lang['en-us'] = {
     ad_spol_l:      ["polygons shorter than this","will have their print speed","scaled down to min speed","in millimeters"],
     ad_arct_s:      "arc tolerance",
     ad_arct_l:      ["convert faceted lines to arcs","center point drift tolerance","when matching arc points","consider values around 0.15","in millimeters","0 to disable"],
-    ad_zhop_s:      "z hop dist",
+    ad_zhop_s:      "z hop distance",
     ad_zhop_l:      ["amount to raise z","on retraction moves","in millimeters","0 to disable"],
     ad_abkl_s:      "anti-backlash",
     ad_abkl_l:      ["for better flat surface finish","use micro-movements to cancel","backlash in solid layer output","in millimeters","0 to disable","if your firmware has M425","put that in the gcode header","and leave this as 0"],