96 lines
2.1 KiB
Vue
96 lines
2.1 KiB
Vue
<script lang="ts" setup>
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import { onMounted, ref } from 'vue';
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import { useWindowSize } from '@vueuse/core';
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import Konva from 'konva/lib';
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import { Stage } from 'konva/lib/Stage';
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const { width, height } = useWindowSize();
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const stage = ref<Stage>();
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const SCALE_BY = 1.1;
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const zoomed = () => {
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stage.value?.on('wheel', ev => {
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if (!stage.value) return;
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// 原始缩放比例
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const scaleX = stage.value?.scaleX();
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const scaleY = stage.value?.scaleY();
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// 当前鼠标位置
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const pointer = stage.value?.getPointerPosition();
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// 鼠标在画布平移量
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const mousePointTo = {
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x: (pointer!.x - stage.value?.x()) / scaleX,
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y: (pointer!.y - stage.value?.y()) / scaleY,
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};
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// 判断鼠标是向上滚动还是向下滚动
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const direction = ev.evt.deltaY > 0 ? -1 : 1;
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// 设置新的缩放比例
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const x = direction > 0 ? scaleX * SCALE_BY : scaleX / SCALE_BY;
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const y = direction > 0 ? scaleY * SCALE_BY : scaleY / SCALE_BY;
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stage.value?.scale({ x, y });
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// 设置新的鼠标位置，缩放时保持不变
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const position = {
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x: pointer!.x - mousePointTo.x * x,
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y: pointer!.y - mousePointTo.y * y,
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};
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stage.value?.position(position);
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});
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};
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const initial = () => {
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stage.value = new Konva.Stage({ container: 'container', width: width.value, height: height.value });
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const layer = new Konva.Layer();
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stage.value.add(layer);
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const text1 = new Konva.Text({
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x: 50,
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y: 70,
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fontSize: 20,
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text: '不缩放',
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draggable: true,
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});
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layer.add(text1);
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const text2 = new Konva.Text({
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x: 50,
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y: 180,
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fontSize: 20,
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text: '缩放',
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draggable: true,
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});
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layer.add(text2);
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const tr1 = new Konva.Transformer({
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nodes: [text1],
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keepRatio: true,
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enabledAnchors: ['top-left', 'top-right', 'bottom-left', 'bottom-right'],
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});
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layer.add(tr1);
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const tr2 = new Konva.Transformer({
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nodes: [text2],
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keepRatio: false,
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enabledAnchors: ['top-left', 'top-right', 'bottom-left', 'bottom-right'],
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});
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layer.add(tr2);
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zoomed();
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};
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onMounted(() => {
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initial();
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});
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</script>
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<template>
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<div id="container"></div>
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</template>
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<style lang="scss" scoped></style>
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