From 059218b567ce57d3afa771bd764cde6f5f55b459 Mon Sep 17 00:00:00 2001
From: bobzel <zzzman@gmail.com>
Date: Sun, 14 Apr 2024 17:22:10 -0400
Subject: clean up of freeform centeringShift and nativeScaling

---
 .../CollectionFreeFormBackgroundGrid.tsx           | 10 +++---
 .../collectionFreeForm/CollectionFreeFormView.tsx  | 37 +++++++++++-----------
 2 files changed, 23 insertions(+), 24 deletions(-)

(limited to 'src')

diff --git a/src/client/views/collections/collectionFreeForm/CollectionFreeFormBackgroundGrid.tsx b/src/client/views/collections/collectionFreeForm/CollectionFreeFormBackgroundGrid.tsx
index 08dfb32ad..0acc99360 100644
--- a/src/client/views/collections/collectionFreeForm/CollectionFreeFormBackgroundGrid.tsx
+++ b/src/client/views/collections/collectionFreeForm/CollectionFreeFormBackgroundGrid.tsx
@@ -14,8 +14,8 @@ export interface CollectionFreeFormViewBackgroundGridProps {
     nativeDimScaling: () => number;
     zoomScaling: () => number;
     layoutDoc: Doc;
-    cachedCenteringShiftX: number;
-    cachedCenteringShiftY: number;
+    centeringShiftX: number;
+    centeringShiftY: number;
 }
 @observer
 export class CollectionFreeFormBackgroundGrid extends React.Component<CollectionFreeFormViewBackgroundGridProps> {
@@ -32,7 +32,7 @@ export class CollectionFreeFormBackgroundGrid extends React.Component<Collection
         const w = this.props.PanelWidth() / this.props.nativeDimScaling() + 2 * renderGridSpace;
         const h = this.props.PanelHeight() / this.props.nativeDimScaling() + 2 * renderGridSpace;
         const strokeStyle = this.props.color();
-        return !this.props.nativeDimScaling() ? null : (
+        return (
             <canvas
                 className="collectionFreeFormView-grid"
                 width={w}
@@ -41,8 +41,8 @@ export class CollectionFreeFormBackgroundGrid extends React.Component<Collection
                 ref={el => {
                     const ctx = el?.getContext('2d');
                     if (ctx) {
-                        const Cx = this.props.cachedCenteringShiftX % renderGridSpace;
-                        const Cy = this.props.cachedCenteringShiftY % renderGridSpace;
+                        const Cx = this.props.centeringShiftX % renderGridSpace;
+                        const Cy = this.props.centeringShiftY % renderGridSpace;
                         ctx.lineWidth = Math.min(1, Math.max(0.5, this.props.zoomScaling()));
                         ctx.setLineDash(gridSpace > 50 ? [3, 3] : [1, 5]);
                         ctx.clearRect(0, 0, w, h);
diff --git a/src/client/views/collections/collectionFreeForm/CollectionFreeFormView.tsx b/src/client/views/collections/collectionFreeForm/CollectionFreeFormView.tsx
index 791124f50..3fab00968 100644
--- a/src/client/views/collections/collectionFreeForm/CollectionFreeFormView.tsx
+++ b/src/client/views/collections/collectionFreeForm/CollectionFreeFormView.tsx
@@ -169,17 +169,19 @@ export class CollectionFreeFormView extends CollectionSubView<Partial<collection
     @computed get nativeHeight() {
         return this._props.NativeHeight?.() || Doc.NativeHeight(this.Document, Cast(this.Document.resolvedDataDoc, Doc, null));
     }
-    @computed get cachedCenteringShiftX(): number {
-        const scaling = !this.nativeDimScaling ? 1 : this.nativeDimScaling;
+    @computed get centeringShiftX(): number {
+        const scaling = this.nativeDimScaling;
         return this._props.isAnnotationOverlay || this._props.originTopLeft ? 0 : this._props.PanelWidth() / 2 / scaling; // shift so pan position is at center of window for non-overlay collections
     }
-    @computed get cachedCenteringShiftY(): number {
+    @computed get centeringShiftY(): number {
+        const panLocAtCenter = !(this._props.isAnnotationOverlay || this._props.originTopLeft);
+        if (!panLocAtCenter) return 0;
         const dv = this.DocumentView?.();
-        const fitWidth = this._props.layout_fitWidth?.(this.Document) ?? dv?.layoutDoc.layout_fitWidth;
-        const scaling = !this.nativeDimScaling ? 1 : this.nativeDimScaling;
+        const aspect = !(this._props.layout_fitWidth?.(this.Document) ?? dv?.layoutDoc.layout_fitWidth) && dv?.nativeWidth && dv?.nativeHeight;
+        const scaling = this.nativeDimScaling;
         // if freeform has a native aspect, then the panel height needs to be adjusted to match it
-        const aspect = dv?.nativeWidth && dv?.nativeHeight && !fitWidth ? dv.nativeHeight / dv.nativeWidth : this._props.PanelHeight() / this._props.PanelWidth();
-        return this._props.isAnnotationOverlay || this._props.originTopLeft ? 0 : (aspect * this._props.PanelWidth()) / 2 / scaling; // shift so pan position is at center of window for non-overlay collections
+        const height = aspect ? (dv.nativeHeight / dv.nativeWidth) * this._props.PanelWidth() : this._props.PanelHeight();
+        return height / 2 / scaling; // shift so pan position is at center of window for non-overlay collections
     }
     @computed get panZoomXf() {
         return new Transform(this.panX(), this.panY(), 1 / this.zoomScaling());
@@ -187,7 +189,7 @@ export class CollectionFreeFormView extends CollectionSubView<Partial<collection
     @computed get screenToFreeformContentsXf() {
         return this._props
             .ScreenToLocalTransform() //
-            .translate(-this.cachedCenteringShiftX, -this.cachedCenteringShiftY)
+            .translate(-this.centeringShiftX, -this.centeringShiftY)
             .transform(this.panZoomXf);
     }
 
@@ -250,8 +252,7 @@ export class CollectionFreeFormView extends CollectionSubView<Partial<collection
     panX = () => this.freeformData()?.bounds.cx ?? NumCast(this.Document[this.panXFieldKey], NumCast(Cast(this.Document.resolvedDataDoc, Doc, null)?.freeform_panX, 1));
     panY = () => this.freeformData()?.bounds.cy ?? NumCast(this.Document[this.panYFieldKey], NumCast(Cast(this.Document.resolvedDataDoc, Doc, null)?.freeform_panY, 1));
     zoomScaling = () => this.freeformData()?.scale ?? NumCast(Doc.Layout(this.Document)[this.scaleFieldKey], 1); //, NumCast(DocCast(this.Document.resolvedDataDoc)?.[this.scaleFieldKey], 1));
-    PanZoomCenterXf = () =>
-        this._props.isAnnotationOverlay && this.zoomScaling() === 1 ? `` : `translate(${this.cachedCenteringShiftX}px, ${this.cachedCenteringShiftY}px) scale(${this.zoomScaling()}) translate(${-this.panX()}px, ${-this.panY()}px)`;
+    PanZoomCenterXf = () => (this._props.isAnnotationOverlay && this.zoomScaling() === 1 ? `` : `translate(${this.centeringShiftX}px, ${this.centeringShiftY}px) scale(${this.zoomScaling()}) translate(${-this.panX()}px, ${-this.panY()}px)`);
     ScreenToContentsXf = () => this.screenToFreeformContentsXf.copy();
     getActiveDocuments = () => this.childLayoutPairs.filter(pair => this.isCurrent(pair.layout)).map(pair => pair.layout);
     isAnyChildContentActive = () => this._props.isAnyChildContentActive();
@@ -1114,9 +1115,7 @@ export class CollectionFreeFormView extends CollectionSubView<Partial<collection
         if (scale !== undefined) {
             const maxZoom = 5; // sets the limit for how far we will zoom. this is useful for preventing small text boxes from filling the screen. So probably needs to be more sophisticated to consider more about the target and context
             const newScale =
-                scale === 0
-                    ? NumCast(this.layoutDoc[this.scaleFieldKey])
-                    : Math.min(maxZoom, (1 / (this.nativeDimScaling || 1)) * scale * Math.min(this._props.PanelWidth() / Math.abs(bounds.width), this._props.PanelHeight() / Math.abs(bounds.height)));
+                scale === 0 ? NumCast(this.layoutDoc[this.scaleFieldKey]) : Math.min(maxZoom, (1 / this.nativeDimScaling) * scale * Math.min(this._props.PanelWidth() / Math.abs(bounds.width), this._props.PanelHeight() / Math.abs(bounds.height)));
             return {
                 panX: this._props.isAnnotationOverlay ? bounds.left - (Doc.NativeWidth(this.layoutDoc) / newScale - bounds.width) / 2 : (bounds.left + bounds.right) / 2,
                 panY: this._props.isAnnotationOverlay ? bounds.top - (Doc.NativeHeight(this.layoutDoc) / newScale - bounds.height) / 2 : (bounds.top + bounds.bot) / 2,
@@ -1763,8 +1762,8 @@ export class CollectionFreeFormView extends CollectionSubView<Partial<collection
                     zoomScaling={this.zoomScaling}
                     layoutDoc={this.layoutDoc}
                     isAnnotationOverlay={this.isAnnotationOverlay}
-                    cachedCenteringShiftX={this.cachedCenteringShiftX}
-                    cachedCenteringShiftY={this.cachedCenteringShiftY}
+                    centeringShiftX={this.centeringShiftX}
+                    centeringShiftY={this.centeringShiftY}
                 />
             </div>
         );
@@ -1812,7 +1811,7 @@ export class CollectionFreeFormView extends CollectionSubView<Partial<collection
     }
 
     @computed get nativeDimScaling() {
-        if (this._firstRender || (this._props.isAnnotationOverlay && !this._props.annotationLayerHostsContent)) return 0;
+        if (this._firstRender || (this._props.isAnnotationOverlay && !this._props.annotationLayerHostsContent)) return 1;
         const nw = this.nativeWidth;
         const nh = this.nativeHeight;
         const hscale = nh ? this._props.PanelHeight() / nh : 1;
@@ -1866,9 +1865,9 @@ export class CollectionFreeFormView extends CollectionSubView<Partial<collection
                 style={{
                     pointerEvents: this._props.isContentActive() && SnappingManager.IsDragging ? 'all' : (this._props.pointerEvents?.() as any),
                     textAlign: this.isAnnotationOverlay ? 'initial' : undefined,
-                    transform: `scale(${this.nativeDimScaling || 1})`,
-                    width: `${100 / (this.nativeDimScaling || 1)}%`,
-                    height: this._props.getScrollHeight?.() ?? `${100 / (this.nativeDimScaling || 1)}%`,
+                    transform: `scale(${this.nativeDimScaling})`,
+                    width: `${100 / this.nativeDimScaling}%`,
+                    height: this._props.getScrollHeight?.() ?? `${100 / this.nativeDimScaling}%`,
                 }}>
                 {this.paintFunc ? (
                     <FormattedTextBox {...this.props} /> // need this so that any live dashfieldviews will update the underlying text that the code eval reads
-- 
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