feat: add fixed center distance scripts (#394)

ea-scripts/Fixed horizontal distance between centers.md

@@ -0,0 +1,72 @@
+/*
+![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-download-raw.jpg)
+
+Download this file and save to your Obsidian Vault including the first line, or open it in "Raw" and copy the entire contents to Obsidian.
+
+![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-fixed-horizontal-distance-between-centers.png)
+
+This script arranges the selected elements horizontally with a fixed center spacing.
+
+See documentation for more details:
+https://zsviczian.github.io/obsidian-excalidraw-plugin/ExcalidrawScriptsEngine.html
+
+```javascript
+*/
+if(!ea.verifyMinimumPluginVersion || !ea.verifyMinimumPluginVersion("1.5.21")) {
+  new Notice("This script requires a newer version of Excalidraw. Please install the latest version.");
+  return;
+}
+settings = ea.getScriptSettings();
+//set default values on first run
+if(!settings["Default distance"]) {
+	settings = {
+	  "Prompt for distance?": true,
+	  "Default distance" : {
+		value: 10,
+		description: "Fixed horizontal distance between centers"
+	  },
+	  "Remember last distance?": false
+	};
+	ea.setScriptSettings(settings);
+}
+
+let distanceStr = settings["Default distance"].value.toString();
+const rememberLastDistance = settings["Remember last distance?"];
+
+if(settings["Prompt for distance?"]) {
+    distanceStr = await utils.inputPrompt("distance?","number",distanceStr);
+}
+
+const distance = parseInt(distanceStr);
+if(isNaN(distance)) {
+  return;
+}
+if(rememberLastDistance) {
+	settings["Default distance"].value = distance;
+	ea.setScriptSettings(settings);
+}
+const elements=ea.getViewSelectedElements();
+const topGroups = ea.getMaximumGroups(elements)
+    .filter(els => !(els.length === 1 && els[0].type ==="arrow")); // ignore individual arrows
+const groups = topGroups.sort((lha,rha) => lha[0].x - rha[0].x);
+
+for(var i=0; i<groups.length; i++) {
+    if(i > 0) {
+        const preGroup = groups[i-1];
+        const curGroup = groups[i];
+
+        const preLeft = Math.min(...preGroup.map(el => el.x));
+        const preRight = Math.max(...preGroup.map(el => el.x + el.width));
+        const preCenter = preLeft + (preRight - preLeft) / 2;
+        const curLeft = Math.min(...curGroup.map(el => el.x));
+        const curRight = Math.max(...curGroup.map(el => el.x + el.width));
+        const curCenter = curLeft + (curRight - curLeft) / 2;
+        const distanceBetweenCenters = curCenter -  preCenter - distance;
+
+        for(const curEl of curGroup) {
+            curEl.x = curEl.x - distanceBetweenCenters;
+        }
+    }
+}
+ea.copyViewElementsToEAforEditing(elements);
+ea.addElementsToView(false, false);

ea-scripts/Fixed vertical distance between centers.md

@@ -0,0 +1,74 @@
+/*
+![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-download-raw.jpg)
+
+Download this file and save to your Obsidian Vault including the first line, or open it in "Raw" and copy the entire contents to Obsidian.
+
+![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-fixed-vertical-distance-between-centers.png)
+
+This script arranges the selected elements vertically with a fixed center spacing.
+
+See documentation for more details:
+https://zsviczian.github.io/obsidian-excalidraw-plugin/ExcalidrawScriptsEngine.html
+
+```javascript
+*/
+if(!ea.verifyMinimumPluginVersion || !ea.verifyMinimumPluginVersion("1.5.21")) {
+  new Notice("This script requires a newer version of Excalidraw. Please install the latest version.");
+  return;
+}
+
+settings = ea.getScriptSettings();
+//set default values on first run
+if(!settings["Default distance"]) {
+	settings = {
+	  "Prompt for distance?": true,
+	  "Default distance" : {
+		value: 10,
+		description: "Fixed vertical distance between centers"
+	  },
+	  "Remember last distance?": false
+	};
+	ea.setScriptSettings(settings);
+}
+
+let distanceStr = settings["Default distance"].value.toString();
+const rememberLastDistance = settings["Remember last distance?"];
+
+if(settings["Prompt for distance?"]) {
+    distanceStr = await utils.inputPrompt("distance?","number",distanceStr);
+}
+
+const distance = parseInt(distanceStr);
+if(isNaN(distance)) {
+  return;
+}
+if(rememberLastDistance) {
+	settings["Default distance"].value = distance;
+	ea.setScriptSettings(settings);
+}
+const elements=ea.getViewSelectedElements(); 
+const topGroups = ea.getMaximumGroups(elements)
+    .filter(els => !(els.length === 1 && els[0].type ==="arrow")); // ignore individual arrows
+const groups = topGroups.sort((lha,rha) => lha[0].y - rha[0].y);
+
+for(var i=0; i<groups.length; i++) {
+    if(i > 0) {
+        const preGroup = groups[i-1];
+        const curGroup = groups[i];
+
+        const preTop = Math.min(...preGroup.map(el => el.y));
+        const preBottom = Math.max(...preGroup.map(el => el.y + el.height));
+        const preCenter = preTop + (preBottom - preTop) / 2;
+        const curTop = Math.min(...curGroup.map(el => el.y));
+        const curBottom = Math.max(...curGroup.map(el => el.y + el.height));
+        const curCenter = curTop + (curBottom - curTop) / 2;
+        const distanceBetweenCenters = curCenter - preCenter - distance;
+
+        for(const curEl of curGroup) {
+            curEl.y = curEl.y - distanceBetweenCenters;
+        }
+    }
+}
+
+ea.copyViewElementsToEAforEditing(elements);
+ea.addElementsToView(false, false);

ea-scripts/README.md

@@ -32,7 +32,9 @@ Open the script you are interested in and save it to your Obsidian Vault includi
 |[Expand rectangles horizontally](Expand%20rectangles%20horizontally.md)|This script expands the width of the selected rectangles until they are all the same width.|![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-expand-rectangles.gif)|[@1-2-3](https://github.com/1-2-3)|
 |[Expand rectangles vertically keep text centered](Expand%20rectangles%20vertically%20keep%20text%20centered.md)|This script expands the height of the selected rectangles until they are all the same height and keep the text centered.|![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-expand-rectangles.gif)|[@1-2-3](https://github.com/1-2-3)|
 |[Expand rectangles vertically](Expand%20rectangles%20vertically.md)|This script expands the height of the selected rectangles until they are all the same height.|![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-expand-rectangles.gif)|[@1-2-3](https://github.com/1-2-3)|
+|[Fixed horizontal distance between centers](Fixed%20horizontal%20distance%20between%20centers.md)|This script arranges the selected elements horizontally with a fixed center spacing.|![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-fixed-horizontal-distance-between-centers.png)|[@1-2-3](https://github.com/1-2-3)|
 |[Fixed spacing](Fixed%20spacing.md)|The script arranges the selected elements horizontally with a fixed spacing. When we create an architecture diagram or mind map, we often need to arrange a large number of elements in a fixed spacing. `Fixed spacing` and `Fixed vertical Distance` scripts can save us a lot of time.|![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-fix-space-demo.png)|[@1-2-3](https://github.com/1-2-3)|
+|[Fixed vertical distance between centers](Fixed%20vertical%20distance%20between%20centers.md)|This script arranges the selected elements vertically with a fixed center spacing.|![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-fixed-vertical-distance-between-centers.png)|[@1-2-3](https://github.com/1-2-3)|
 |[Fixed vertical distance](Fixed%20vertical%20distance.md)|The script arranges the selected elements vertically with a fixed spacing. When we create an architecture diagram or mind map, we often need to arrange a large number of elements in a fixed spacing. `Fixed spacing` and `Fixed vertical Distance` scripts can save us a lot of time.|![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-fixed-vertical-distance.png)|[@1-2-3](https://github.com/1-2-3)|
 |[Set Font Family](Set%20Font%20Family.md)|Sets font family of the text block (Virgil, Helvetica, Cascadia). Useful if you want to set a keyboard shortcut for selecting font family.|![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-font-family.jpg)|[@zsviczian](https://github.com/zsviczian)|
 |[Set Grid](Set%20Grid.md)|The default grid size in Excalidraw is 20. Currently there is no way to change the grid size via the user interface. This script offers a way to bridge this gap.|![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-grid.jpg)|[@zsviczian](https://github.com/zsviczian)|

ea-scripts/index.md

@@ -42,7 +42,9 @@ I would love to include your contribution in the script library. If you have a s
 - [[#Expand rectangles horizontally]]
 - [[#Expand rectangles vertically keep text centered]]
 - [[#Expand rectangles vertically]]
+- [[#Fixed horizontal distance between centers]]
 - [[#Fixed spacing]]
+- [[#Fixed vertical distance between centers]]
 - [[#Fixed vertical distance]]
 - [[#Lighten background color]]
 - [[#Modify background color opacity]]
@@ -161,12 +163,24 @@ https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/ea
 ```
 <table><tr  valign='top'><td class="label">Author</td><td class="data"><a href='https://github.com/1-2-3'>@1-2-3</a></td></tr><tr valign='top'><td class="label">Source</td><td class="data"><a href='https://github.com/zsviczian/obsidian-excalidraw-plugin/blob/master/ea-scripts/Expand%20rectangles%20vertically.md'>File on GitHub</a></td></tr><tr valign='top'><td class="label">Description</td><td class="data">This script expands the height of the selected rectangles until they are all the same height.<br><img src='https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-expand-rectangles.gif'></td></tr></table>
 
+## Fixed horizontal distance between centers
+```excalidraw-script-install
+https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/ea-scripts/Fixed%20horizontal%20distance%20between%20centers.md
+```
+<table><tr  valign='top'><td class="label">Author</td><td class="data"><a href='https://github.com/1-2-3'>@1-2-3</a></td></tr><tr valign='top'><td class="label">Source</td><td class="data"><a href='https://github.com/zsviczian/obsidian-excalidraw-plugin/blob/master/ea-scripts/Fixed%20horizontal%20distance%20between%20centers.md'>File on GitHub</a></td></tr><tr valign='top'><td class="label">Description</td><td class="data">This script arranges the selected elements horizontally with a fixed center spacing.<br><img src='https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-fixed-horizontal-distance-between-centers.png'></td></tr></table>
+
 ## Fixed spacing
 ```excalidraw-script-install
 https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/ea-scripts/Fixed%20spacing.md
 ```
 <table><tr  valign='top'><td class="label">Author</td><td class="data"><a href='https://github.com/1-2-3'>@1-2-3</a></td></tr><tr valign='top'><td class="label">Source</td><td class="data"><a href='https://github.com/zsviczian/obsidian-excalidraw-plugin/blob/master/ea-scripts/Fixed%20spacing.md'>File on GitHub</a></td></tr><tr valign='top'><td class="label">Description</td><td class="data">The script arranges the selected elements horizontally with a fixed spacing. When we create an architecture diagram or mind map, we often need to arrange a large number of elements in a fixed spacing. `Fixed spacing` and `Fixed vertical Distance` scripts can save us a lot of time.<br><img src='https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-fix-space-demo.png'></td></tr></table>
 
+## Fixed vertical distance between centers
+```excalidraw-script-install
+https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/ea-scripts/Fixed%20vertical%20distance%20between%20centers.md
+```
+<table><tr  valign='top'><td class="label">Author</td><td class="data"><a href='https://github.com/1-2-3'>@1-2-3</a></td></tr><tr valign='top'><td class="label">Source</td><td class="data"><a href='https://github.com/zsviczian/obsidian-excalidraw-plugin/blob/master/ea-scripts/Fixed%20vertical%20distance%20between%20centers.md'>File on GitHub</a></td></tr><tr valign='top'><td class="label">Description</td><td class="data">This script arranges the selected elements vertically with a fixed center spacing.<br><img src='https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-fixed-vertical-distance-between-centers.png'></td></tr></table>
+
 ## Fixed vertical distance
 ```excalidraw-script-install
 https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/ea-scripts/Fixed%20vertical%20distance.md