advent22/ui/src/components/calendar/ThouCanvas.vue

<template>
  <svg
    xmlns="http://www.w3.org/2000/svg"
    version="1.1"
    viewBox="0 0 1000 1000"
    preserveAspectRatio="none"
    @contextmenu.prevent
    @mousedown="transform_mouse_event"
    @mousemove="transform_mouse_event"
    @mouseup="transform_mouse_event"
    @click="transform_mouse_event"
    @dblclick="transform_mouse_event"
  >
    <slot name="default" />
  </svg>
</template>

<script setup lang="ts">
import { Vector2D } from "@/lib/rects/vector2d";

function get_event_thous(event: MouseEvent): Vector2D {
  if (!(event.currentTarget instanceof SVGSVGElement)) {
    return new Vector2D();
  }

  return new Vector2D(
    Math.round((event.offsetX / event.currentTarget.clientWidth) * 1000),
    Math.round((event.offsetY / event.currentTarget.clientHeight) * 1000),
  );
}

type TCMouseEvent = [MouseEvent, Vector2D];

const emit = defineEmits<{
  mousedown: TCMouseEvent;
  mouseup: TCMouseEvent;
  mousemove: TCMouseEvent;
  click: TCMouseEvent;
  dblclick: TCMouseEvent;
}>();

function transform_mouse_event(event: MouseEvent) {
  const point = get_event_thous(event);

  // mute a useless typescript error
  const event_type = event.type as "mousedown";
  emit(event_type, event, point);
}
</script>

<style scoped>
svg {
  height: 100%;
  width: 100%;

  position: absolute;
  left: 0;
  top: 0;

  z-index: auto;
}
</style>