konva-demo/src/views/select/transform/index.vue

<template>
	<div id="container"></div>
</template>

<script lang="ts" setup>
import { useWindowSize } from '@vueuse/core';
import Konva from 'konva/lib';
import { onMounted, ref } from 'vue';
import { Stage } from 'konva/lib/Stage';

const { width, height } = useWindowSize();
const stage = ref<Stage>();
const SCALE_BY = 1.1;

const zoomed = () => {
	stage.value?.on('wheel', ev => {
		if (!stage.value) return;

		const scaleX = stage.value?.scaleX();
		const scaleY = stage.value?.scaleY();

		const pointerPosition = stage.value?.getPointerPosition();

		const mousePointTo = {
			x: (pointerPosition!.x - stage.value?.x()) / scaleX,
			y: (pointerPosition!.y - stage.value?.y()) / scaleY,
		};
		const direction = ev.evt.deltaY > 0 ? -1 : 1;

		const x = direction > 0 ? scaleX * SCALE_BY : scaleX / SCALE_BY;
		const y = direction > 0 ? scaleY * SCALE_BY : scaleY / SCALE_BY;
		stage.value?.scale({ x, y });

		const position = {
			x: pointerPosition!.x - mousePointTo.x * x,
			y: pointerPosition!.y - mousePointTo.y * y,
		};
		stage.value?.position(position);
	});
};

const initial = () => {
	stage.value = new Konva.Stage({ container: 'container', width: width.value, height: height.value });
	const layer = new Konva.Layer();

	stage.value.add(layer);
	zoomed();

	// 绘制形状
	const rect = new Konva.Rect({
		x: 160,
		y: 60,
		width: 160,
		height: 90,
		fill: 'red',
		name: 'rect',
		stroke: 'black',
		draggable: true,
	});

	layer.add(rect);

	// 绘制文字
	const text = new Konva.Text({ x: 5, y: 5 });
	layer.add(text);

	const tr = new Konva.Transformer();
	layer.add(tr);
	tr.nodes([rect]);

	// 发生变化时
	rect.on('transformstart', function () {
		console.log('变化。。。');
	});

	// 拖拽移动
	rect.on('dragmove', function () {
		updateText();
	});

	rect.on('transform', function () {
		updateText();
		console.log('transform');
	});

	rect.on('transformend', function () {
		console.log('transform end');
	});

	function updateText() {
		const lines = [
			'x: ' + rect.x(),
			'y: ' + rect.y(),
			'rotation: ' + rect.rotation(),
			'width: ' + rect.width(),
			'height: ' + rect.height(),
			'scaleX: ' + rect.scaleX(),
			'scaleY: ' + rect.scaleY(),
		];
		text.text(lines.join('\n'));
	}
};

onMounted(() => {
	initial();
});
</script>