From ed37804cfa330a678b61359a7e689229a5b5e5ae Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ccxvii.net>
Date: Fri, 29 Sep 2023 22:45:09 +0200
Subject: Show HQ range on mouse-over.

---
 play.css |  6 +++---
 play.js  | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 63 insertions(+), 4 deletions(-)

diff --git a/play.css b/play.css
index f4cc859..cdf7f1e 100644
--- a/play.css
+++ b/play.css
@@ -161,9 +161,9 @@ main {
 	border: 4px solid transparent;
 }
 
-.hex.town { background-color: #F006; }
-.hex.stream { background-color: #00F6; }
-.hex.town.stream { background-color: #F0F6; }
+.hex.range {
+	background-color: #ff03;
+}
 
 .hex.action {
 	border: 4px solid #fff6;
diff --git a/play.js b/play.js
index d1338f5..5fb4f3b 100644
--- a/play.js
+++ b/play.js
@@ -152,8 +152,24 @@ function on_focus_hex(evt) {
 		show_move_path(evt.target.my_id)
 }
 
+var focused_piece = null
+
 function on_focus_piece(evt) {
+	let p = evt.target.my_id
 	document.getElementById("status").textContent = evt.target.my_name
+	if (data.pieces[p].type === "hq") {
+		focused_piece = p
+		show_hq_range(p)
+	}
+}
+
+function on_blur_piece(evt) {
+	let p = evt.target.my_id
+	on_blur()
+	if (data.pieces[p].type === "hq") {
+		focused_piece = -1
+		hide_hq_range(p)
+	}
 }
 
 function on_click_action(evt) {
@@ -250,7 +266,7 @@ function build_hexes() {
 	for (let p = 0; p < ui.pieces.length; ++p) {
 		ui.pieces[p].onmousedown = on_click_action
 		ui.pieces[p].onmouseenter = on_focus_piece
-		ui.pieces[p].onmouseleave = on_blur
+		ui.pieces[p].onmouseleave = on_blur_piece
 		ui.pieces[p].my_action = "piece"
 		ui.pieces[p].my_id = p
 		ui.pieces[p].my_name = data.pieces[p].name
@@ -309,6 +325,46 @@ function find_reinforcement_z(who) {
 	return 0
 }
 
+function calc_distance(a, b) {
+	let ac = a % 100
+	let bc = b % 100
+	let ay = a / 100 | 0
+	let by = b / 100 | 0
+	let ax = ac - (ay >> 1)
+	let bx = bc - (by >> 1)
+	let az = -ax - ay
+	let bz = -bx - by
+	return Math.max(Math.abs(bx-ax), Math.abs(by-ay), Math.abs(bz-az))
+}
+
+function is_in_range(x, hq) {
+	let hq_x = view.pieces[hq] >> 1
+	if (hq_x >= 1000) {
+		let hq_m = view.pieces[hq] & 1
+		let hq_r = hq_m ? data.pieces[hq].range2 : data.pieces[hq].range1
+		return calc_distance(x, hq_x) === hq_r
+	}
+	return false
+}
+
+function show_hq_range(hq) {
+	for (let row = 0; row < data.map.rows; ++row) {
+		for (let col = 0; col < data.map.cols; ++col) {
+			let id = first_hex + row * 100 + col
+			ui.hexes[id].classList.toggle("range", is_in_range(id, hq))
+		}
+	}
+}
+
+function hide_hq_range() {
+	for (let row = 0; row < data.map.rows; ++row) {
+		for (let col = 0; col < data.map.cols; ++col) {
+			let id = first_hex + row * 100 + col
+			ui.hexes[id].classList.remove("range")
+		}
+	}
+}
+
 function on_update() {
 	ui.stack.fill(0)
 
@@ -323,6 +379,9 @@ function on_update() {
 		}
 	}
 
+	if (focused_piece <= 4)
+		show_hq_range(focused_piece)
+
 	for (let id = 0; id < piece_count; ++id) {
 		let hex = view.pieces[id] >> 1
 		let z = 0
-- 
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