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examples: add math example (#1461)
* examples: add math example * docs: add math example
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‎docs/examples/index.ts‎

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@@ -19,6 +19,7 @@ import { SnapToHandleApp, SnappableConnectionLine } from './connection-radius'
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import { NodeResizerApp, ResizableNode } from './node-resizer'
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import { ToolbarApp, ToolbarNode } from './node-toolbar'
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import { LayoutApp, LayoutEdge, LayoutElements, LayoutIcon, LayoutNode, useLayout, useRunProcess, useShuffle } from './layout'
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import { MathApp, MathCSS, MathElements, MathIcon, MathOperatorNode, MathResultNode, MathValueNode } from './math'
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export const exampleImports = {
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basic: {
@@ -140,4 +141,13 @@ export const exampleImports = {
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'@dagrejs/dagre': 'https://cdn.jsdelivr.net/npm/@dagrejs/dagre@1.1.2/+esm',
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},
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},
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math: {
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'App.vue': MathApp,
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'ValueNode.vue': MathValueNode,
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'OperatorNode.vue': MathOperatorNode,
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'ResultNode.vue': MathResultNode,
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'Icon.vue': MathIcon,
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'style.css': MathCSS,
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'initial-elements.js': MathElements,
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},
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}

‎docs/examples/math/App.vue‎

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<script setup>
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import { ref } from 'vue'
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import { VueFlow } from '@vue-flow/core'
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import { Background } from '@vue-flow/background'
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import { initialEdges, initialNodes } from './initial-elements.js'
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import ValueNode from './ValueNode.vue'
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import OperatorNode from './OperatorNode.vue'
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import ResultNode from './ResultNode.vue'
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const nodes = ref(initialNodes)
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const edges = ref(initialEdges)
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</script>
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<template>
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<VueFlow class="math-flow" :nodes="nodes" :edges="edges" fit-view-on-init>
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<template #node-value="props">
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<ValueNode :id="props.id" :data="props.data" />
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</template>
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<template #node-operator="props">
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<OperatorNode :id="props.id" :data="props.data" />
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</template>
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<template #node-result="props">
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<ResultNode :id="props.id" />
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</template>
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<Background />
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</VueFlow>
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</template>

‎docs/examples/math/Icon.vue‎

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<script setup>
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defineProps(['name'])
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</script>
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<template>
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<svg v-if="name === '+'" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
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<path fill="currentColor" d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6z" />
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</svg>
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<svg v-else-if="name === '-'" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
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<path fill="currentColor" d="M19 13H5v-2h14v2z" />
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</svg>
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<svg v-else-if="name === '*'" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
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<path
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fill="none"
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stroke="currentColor"
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stroke-linecap="round"
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stroke-linejoin="round"
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stroke-width="2"
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d="M12 12L6 6m6 6l6 6m-6-6l6-6m-6 6l-6 6"
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/>
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</svg>
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<svg v-else-if="name === '/'" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
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<path
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fill="currentColor"
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d="M19 13H5v-2h14zm-7-8a2 2 0 0 1 2 2a2 2 0 0 1-2 2a2 2 0 0 1-2-2a2 2 0 0 1 2-2m0 10a2 2 0 0 1 2 2a2 2 0 0 1-2 2a2 2 0 0 1-2-2a2 2 0 0 1 2-2"
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/>
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</svg>
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</template>

‎docs/examples/math/OperatorNode.vue‎

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<script setup>
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import { Handle, Position, useVueFlow } from '@vue-flow/core'
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import Icon from './Icon.vue'
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const props = defineProps(['id', 'data'])
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const operators = ['+', '-', '*', '/']
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const { updateNodeData } = useVueFlow()
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</script>
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<template>
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<div class="buttons nodrag">
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<button
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v-for="operator of operators"
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:key="`${id}-${operator}-operator`"
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:class="{ selected: data.operator === operator }"
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@click="updateNodeData(props.id, { operator })"
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>
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<Icon :name="operator" />
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</button>
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</div>
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<Handle type="source" :position="Position.Right" :connectable="false" />
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<Handle id="target-a" type="target" :position="Position.Left" :connectable="false" />
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<Handle id="target-b" type="target" :position="Position.Left" :connectable="false" />
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</template>

‎docs/examples/math/ResultNode.vue‎

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<script setup>
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import { computed } from 'vue'
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import { Handle, Position, useHandleConnections, useNodesData, useVueFlow } from '@vue-flow/core'
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defineProps(['id'])
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const mathFunctions = {
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'+': (a, b) => a + b,
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'-': (a, b) => a - b,
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'*': (a, b) => a * b,
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'/': (a, b) => a / b,
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}
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const { getConnectedEdges } = useVueFlow()
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// Get the source connections of the result node. In this example it's only one operator node.
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const sourceConnections = useHandleConnections({
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// type target means all connections where *this* node is the target
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// that means we go backwards in the graph to find the source of the connection(s)
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type: 'target',
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})
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// Get the source connections of the operator node
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const operatorSourceConnections = computed(() =>
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getConnectedEdges(sourceConnections.value[0].source).filter((e) => e.source !== sourceConnections.value[0].source),
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)
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const operatorData = useNodesData(() => sourceConnections.value.map((connection) => connection.source))
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const valueData = useNodesData(() => operatorSourceConnections.value.map((connection) => connection.source))
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const result = computed(() => {
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const currResult = operatorData.value.reduce((acc, { data }) => {
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const operator = data?.operator
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if (operator) {
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const [a, b] = valueData.value.map(({ data }) => data?.value)
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if (a && b) {
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return mathFunctions[operator](a, b)
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}
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}
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return acc
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}, 0)
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// Round to 2 decimal places
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return Math.round(currResult * 100) / 100
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})
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</script>
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<template>
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<div class="calculation">
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<template v-for="(value, i) in valueData" :key="`${value.id}-${value.data}`">
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<span>
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{{ value.data?.value }}
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</span>
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<span v-if="i !== valueData.length - 1">
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{{ operatorData[0].data?.operator }}
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</span>
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</template>
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</div>
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<span> = </span>
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<span class="counter" :style="{ color: result > 0 ? '#5EC697' : '#f15a16' }">
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{{ result }}
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</span>
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<Handle
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type="target"
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:position="Position.Left"
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:connectable="false"
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:style="{ background: result > 0 ? '#5EC697' : '#f15a16' }"
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/>
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</template>

‎docs/examples/math/ValueNode.vue‎

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<script setup>
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import { Handle, Position, useVueFlow } from '@vue-flow/core'
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const props = defineProps(['id', 'data'])
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const { updateNodeData } = useVueFlow()
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function onChange(event) {
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const value = Number.parseFloat(event.target.value)
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if (!Number.isNaN(value)) {
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updateNodeData(props.id, { value })
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}
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}
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</script>
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<template>
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<label :for="`${id}-input`"> </label>
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<input :id="`${id}-input`" :value="data.value" type="number" class="nodrag" @change="onChange" />
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<Handle type="source" :position="Position.Right" :connectable="false" />
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</template>

‎docs/examples/math/index.ts‎

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export { default as MathApp } from './App.vue?raw'
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export { default as MathElements } from './initial-elements.js?raw'
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export { default as MathValueNode } from './ValueNode.vue?raw'
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export { default as MathOperatorNode } from './OperatorNode.vue?raw'
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export { default as MathResultNode } from './ResultNode.vue?raw'
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export { default as MathIcon } from './Icon.vue?raw'
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export { default as MathCSS } from './style.css?inline'

‎docs/examples/math/initial-elements.js‎

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export const initialNodes = [
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{
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id: '1',
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position: { x: 0, y: 0 },
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type: 'value',
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data: { value: 10 },
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},
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{
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id: '2',
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position: { x: 0, y: 100 },
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type: 'value',
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data: { value: 30 },
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},
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{
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id: '3',
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position: { x: 300, y: 35 },
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type: 'operator',
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data: { operator: '+' },
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},
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{
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id: '4',
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position: { x: 650, y: 15 },
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type: 'result',
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},
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]
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export const initialEdges = [
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{ id: 'e1-3', source: '1', target: '3', animated: true, targetHandle: 'target-a' },
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{ id: 'e2-3', source: '2', target: '3', animated: true, targetHandle: 'target-b' },
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{ id: 'e3-4', source: '3', target: '4', animated: true },
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]

‎docs/examples/math/style.css‎

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.math-flow {
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background-color: #edf2f7;
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height: 100%;
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width: 100%;
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}
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.vue-flow__handle {
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height: 24px;
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width: 10px;
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background: #aaa;
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border-radius: 4px
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}
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.vue-flow__edges path {
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stroke-width: 3;
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}
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.vue-flow__node-value {
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display: flex;
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align-items: center;
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gap: 8px;
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padding: 8px 16px;
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background-color: #f3f4f6;
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border-radius: 8px;
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box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
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}
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.vue-flow__node-value.selected {
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box-shadow: 0 0 0 2px #ec4899;
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}
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.vue-flow__node-value input {
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flex: 1;
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padding: 8px;
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border: none;
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border-radius: 8px;
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box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
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}
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.vue-flow__node-value input:focus {
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outline: none;
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}
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.vue-flow__node-value .vue-flow__handle {
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background-color: #ec4899;
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}
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.vue-flow__node-operator {
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display: flex;
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flex-direction: column;
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align-items: center;
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gap: 8px;
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padding: 16px 24px;
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background-color: #f3f4f6;
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border-radius: 8px;
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box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
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}
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.vue-flow__node-operator.selected {
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box-shadow: 0 0 0 2px #0EA5E9;
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}
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.vue-flow__node-operator .buttons {
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display: flex;
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gap: 8px;
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}
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.vue-flow__node-operator button {
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border: none;
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cursor: pointer;
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background-color: #4a5568;
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border-radius: 8px;
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color: white;
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box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
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width: 40px;
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height: 40px;
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font-size: 16px;
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display: flex;
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align-items: center;
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justify-content: center;
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}
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.vue-flow__node-operator button:hover {
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background-color: #0EA5E9;
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transition: background-color 0.2s;
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}
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.vue-flow__node-operator button.selected {
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background-color: #0EA5E9;
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}
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.vue-flow__node-operator .vue-flow__handle[data-handleid="target-a"] {
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top: 25%;
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}
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.vue-flow__node-operator .vue-flow__handle[data-handleid="target-b"] {
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top: 75%;
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}
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.vue-flow__node-operator .vue-flow__handle {
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background-color: #0EA5E9;
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}
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.vue-flow__node-result {
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display: flex;
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flex-direction: column;
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align-items: center;
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gap: 8px;
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padding: 16px 24px;
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background-color: #f3f4f6;
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border-radius: 8px;
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box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
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}
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.vue-flow__node-result.selected {
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box-shadow: 0 0 0 2px #5EC697;
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}
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.vue-flow__node-result .calculation {
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display: flex;
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gap: 8px;
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font-size: 24px;
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}

‎docs/src/.vitepress/config.mts‎

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{ text: 'Drag & Drop', link: '/examples/dnd' },
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{ text: 'Interactions', link: '/examples/interaction' },
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{ text: 'Save & Restore', link: '/examples/save' },
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{ text: 'Math Operation Flow', link: '/examples/math' },
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{ text: 'Screenshot', link: '/examples/screenshot' },
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{ text: 'Node Visibility', link: '/examples/hidden' },
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{ text: 'Node Intersections', link: '/examples/intersection' },

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