From 8712e7ba7ba378b79afd7891349076236d24e1d8 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 30 Nov 2020 00:03:08 +0000
Subject: [PATCH] zoom button

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 templates/macros.tera |  4 +++-
 templates/script.ts   | 26 ++++++++++++++++++++++----
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/templates/macros.tera b/templates/macros.tera
index e485216b..542b84ba 100644
--- a/templates/macros.tera
+++ b/templates/macros.tera
@@ -6,7 +6,9 @@
       data-us="{{player}}"
       data-gen="{{gen}}"
       data-sse-url-prefix="{{sse_url_prefix}}"
-      data-load="{{ load | escape }}">
+      data-load="{{ load | escape }}"
+      style="transform-origin: top left;"
+      >
 <style>
   html {
     background-color: #eef;
diff --git a/templates/script.ts b/templates/script.ts
index 14bfe914..792fe056 100644
--- a/templates/script.ts
+++ b/templates/script.ts
@@ -112,6 +112,8 @@ var log_elem : HTMLElement;
 var logscroll_elem : HTMLElement;
 var status_node : HTMLElement;
 var uos_node : HTMLElement;
+var zoom_val : HTMLInputElement;
+var zoom_btn : HTMLInputElement;
 var wresting: boolean;
 
 const uo_kind_prec : { [kind: string]: number } = {
@@ -883,14 +885,28 @@ function add_timestamped_log_message(ts_html: string, msg_html: string) {
 
 // ----- zoom -----
 
+function zoom_pct (): number | undefined {
+  let str = zoom_val.value;
+  let val = parseFloat(str);
+  if (isNaN(val)) {
+    return undefined;
+  } else {
+    return val;
+  }
+}
+
 function zoom_enable() {
-  (document.getElementById("zoom-btn") as any).disabled = false;
+  zoom_btn.disabled = (zoom_pct() === undefined);
 }
 
 function zoom_activate() {
-  let zoom_val = document.getElementById("zoom-val");
-  console.log(zoom_val);
-  (document.getElementById("zoom-btn") as any).disabled = true;
+  let pct = zoom_pct();
+  if (pct !== undefined) {
+    let fact = pct * 0.01;
+    (document.getElementsByTagName('body')[0] as HTMLElement)
+      .style.transform = 'scale('+fact+','+fact+')';
+  }
+  zoom_btn.disabled = true;
 }
 
 // ----- test counter, startup -----
@@ -1117,6 +1133,8 @@ function startup() {
   console.log(wasm_bindgen.setup("OK"));
 
   var body = document.getElementById("main-body")!;
+  zoom_btn = document.getElementById("zoom-btn") as any;
+  zoom_val = document.getElementById("zoom-val") as any;
   ctoken = body.dataset.ctoken!;
   us = body.dataset.us!;
   gen = +body.dataset.gen!;
-- 
2.30.2