Fixing some bugs, including outzooming too much.

LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/LogGraphCanvas.qml

@@ -124,7 +124,7 @@ Canvas {
        \qmlproperty int LogGraphCanvas::maxgradx
        Max power of the logarithmic scaled on the x axis in logarithmic mode.
     */
-    property int maxgradx: 20
+    property int maxgradx: 90
     
     /*!
        \qmlproperty var LogGraphCanvas::imageLoaders

LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/ViewPositionChangeOverlay.qml

@@ -94,9 +94,13 @@ Item {
         property int positionChangeTimer: 0
         
         function updatePosition(deltaX, deltaY) {
-            settingsInstance.xmin = (Modules.Canvas.px2x(Modules.Canvas.x2px(settingsInstance.xmin)-deltaX))
-            settingsInstance.ymax += deltaY/canvas.yzoom
-            settingsInstance.ymax = settingsInstance.ymax.toFixed(4)
+            const unauthorized = [NaN, Infinity, -Infinity]
+            const xmin = (Modules.Canvas.px2x(Modules.Canvas.x2px(settingsInstance.xmin)-deltaX))
+            const ymax = settingsInstance.ymax + deltaY/canvas.yzoom
+            if(!unauthorized.includes(xmin))
+                settingsInstance.xmin = xmin
+            if(!unauthorized.includes(ymax))
+                settingsInstance.ymax = ymax.toFixed(4)
             settingsInstance.changed()
             parent.positionChanged(deltaX, deltaY)
             
@@ -140,12 +144,15 @@ Item {
             }
             let newXZoom = (settingsInstance.xzoom+xZoomDelta).toFixed(0)
             let newYZoom = (settingsInstance.yzoom+yZoomDelta).toFixed(0)
-            if(newXZoom == settingsInstance.xzoom) // No change, allow more precision.
+            // Check if we need to have more precision
+            if(newXZoom < 10) 
                 newXZoom = (settingsInstance.xzoom+xZoomDelta).toFixed(4)
-            if(newYZoom == settingsInstance.yzoom) // No change, allow more precision.
+            if(newYZoom < 10)
                 newYZoom = (settingsInstance.yzoom+yZoomDelta).toFixed(4)
-            settingsInstance.xzoom = newXZoom
-            settingsInstance.yzoom = newYZoom
+            if(newXZoom > 0.5)
+                settingsInstance.xzoom = newXZoom
+            if(newYZoom > 0.5)
+                settingsInstance.yzoom = newYZoom
             settingsInstance.changed()
         }
     }

LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/canvas.mjs

@@ -139,7 +139,15 @@ class CanvasAPI extends Module {
      * Max power of the logarithmic scaled on the x axis in logarithmic mode.
      * @returns {number}
      */
-    get maxgradx() { return this._canvas.maxgradx }
+    get maxgradx() {
+        return Math.min(
+            309, // 10e309 = Infinity (beyond this land be dragons)
+            Math.max(
+                Math.ceil(Math.abs(Math.log10(this.xmin))),
+                Math.ceil(Math.abs(Math.log10(this.px2x(this.width))))
+            )
+        )
+    }
 
     //
     // Methods to draw the canvas