README: Add image map for overview

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 86 insertions, 1 deletions

diff --git a/README.md b/README.md
index 8ae54ec..dceaf89 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,92 @@ and native Layer-4 sockets (TCP, UDP, ICMP/ICMPv6 echo) on a host. It doesn't
 require any capabilities or privileges, and it can be used as a simple
 replacement for Slirp.
 
-![overview diagram](/builds/passt_overview.png)
+<img src="/builds/passt_overview.png" usemap="#image-map" class="bright" style="z-index: 20; position: relative;">
+<map name="image-map" id="map_overview">
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+    <area class="map_area" target="_blank" href="https://man7.org/linux/man-pages/man7/unix.7.html" coords="569,306,674,359" shape="rect">
+    <area class="map_area" target="_blank" href="https://passt.top/passt/tree/udp.c" coords="719,152,740,176,792,134,768,108" shape="poly">
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+    <area class="map_area" target="_blank" href="https://passt.top/passt/tree/tcp.c" coords="730,273,774,326,947,176,902,119" shape="poly">
+    <area class="map_area" target="_blank" href="https://passt.top/passt/tree/igmp.c" coords="865,273,912,295" shape="rect">
+    <area class="map_area" target="_blank" href="https://passt.top/passt/tree/arp.c" coords="854,300,897,320" shape="rect">
+    <area class="map_area" target="_blank" href="https://passt.top/passt/tree/ndp.c" coords="869,325,909,344" shape="rect">
+    <area class="map_area" target="_blank" href="https://passt.top/passt/tree/mld.c" coords="924,267,964,289" shape="rect">
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+    <area class="map_area" target="_blank" href="https://passt.top/passt/tree/dhcp.c" coords="931,328,981,352" shape="rect">
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+    <area class="map_area" target="_blank" href="https://man7.org/linux/man-pages/man4/veth.4.html" coords="1119,351,1157,339,1198,340,1236,345,1258,359,1229,377,1176,377,1139,375,1114,365" shape="poly">
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+    <area class="map_area" target="_blank" href="https://man7.org/linux/man-pages/man7/netlink.7.html" coords="1119,278,1117,293,1165,304,1169,288" shape="poly">
+    <area class="map_area" target="_blank" href="https://passt.top/passt/tree/passt.c#n195" coords="989,294,1040,264,1089,280,986,344" shape="poly">
+</map>
+<canvas id="map_highlight" style="border: 0px; z-index: 10; position: fixed;"></canvas>
+<script>
+function canvas_position(el) {
+	var rect = el.getBoundingClientRect();
+	var canvas = document.getElementById('map_highlight');
+
+	canvas.width = rect.right - rect.left;
+	canvas.height = rect.bottom - rect.top;
+	canvas.style.left = rect.left + 'px';
+	canvas.style.top = rect.top + 'px';
+}
+
+function map_hover() {
+	var coords = this.coords.split(',');
+	var canvas = document.getElementById('map_highlight');
+	var ctx = canvas.getContext('2d');
+
+	canvas_position(this);
+
+	ctx.fillStyle = 'rgba(255, 255, 255, .3)';
+	ctx.lineWidth = 1.5;
+	ctx.strokeStyle = 'rgba(255, 255, 100, 1)';
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+	ctx.setLineDash([15, 15]);
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+	ctx.fill();
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+}
+</script>
 
 - [General idea](#general-idea)
 - [Non-functional Targets](#non-functional-targets)