feat: add styled QR code generator with logo and edge customization
Generates QR codes from a URL with center logo upload, adjustable logo padding and size, dot/corner-square/corner-dot style pickers, color controls, and PNG/SVG export. Uses error correction level H so the logo can occlude up to ~30% of modules without breaking scannability.
This commit is contained in:
Julien Calixte
154
src/App.vue
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154
src/App.vue
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<script setup lang="ts">
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import { reactive, ref } from 'vue'
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import { useQrCode, type QrOptions } from './composables/useQrCode'
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const preview = ref<HTMLDivElement | null>(null)
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const options = reactive<QrOptions>({
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data: 'https://example.com',
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size: 320,
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dotsType: 'rounded',
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dotsColor: '#1f2937',
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cornersSquareType: 'extra-rounded',
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cornersSquareColor: '#1f2937',
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cornersDotType: 'dot',
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cornersDotColor: '#1f2937',
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backgroundColor: '#ffffff',
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image: null,
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imageMargin: 8,
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imageSize: 0.4,
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hideBackgroundDots: true,
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})
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const { download } = useQrCode(preview, options)
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const dotTypes = ['square', 'dots', 'rounded', 'classy', 'classy-rounded', 'extra-rounded'] as const
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const cornerSquareTypes = ['square', 'dot', 'extra-rounded'] as const
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const cornerDotTypes = ['square', 'dot'] as const
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function onLogoChange(e: Event) {
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const file = (e.target as HTMLInputElement).files?.[0]
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if (!file) return
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const reader = new FileReader()
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reader.onload = () => {
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options.image = reader.result as string
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}
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reader.readAsDataURL(file)
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}
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function clearLogo() {
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options.image = null
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const input = document.getElementById('logo-input') as HTMLInputElement | null
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if (input) input.value = ''
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}
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</script>
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<template>
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<div class="app">
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<header>
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<h1>QR Code Studio</h1>
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<p class="subtitle">Generate styled QR codes with logo, dots, and corner customization</p>
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</header>
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<main>
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<section class="controls">
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<div class="field">
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<label for="url">URL or text</label>
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<input id="url" v-model="options.data" type="text" placeholder="https://example.com" />
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</div>
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<fieldset>
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<legend>Logo</legend>
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<div class="field">
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<input id="logo-input" type="file" accept="image/*" @change="onLogoChange" />
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</div>
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<div v-if="options.image" class="logo-actions">
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<img :src="options.image" alt="logo preview" class="logo-thumb" />
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<button type="button" class="ghost" @click="clearLogo">Remove logo</button>
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</div>
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<div class="field">
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<label>
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Logo padding
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<span class="value">{{ options.imageMargin }} px</span>
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</label>
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<input v-model.number="options.imageMargin" type="range" min="0" max="40" step="1" />
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</div>
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<div class="field">
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<label>
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Logo size
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<span class="value">{{ Math.round(options.imageSize * 100) }} %</span>
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</label>
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<input v-model.number="options.imageSize" type="range" min="0.1" max="0.6" step="0.01" />
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</div>
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<label class="checkbox">
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<input v-model="options.hideBackgroundDots" type="checkbox" />
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Hide dots behind logo
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</label>
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</fieldset>
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<fieldset>
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<legend>Body</legend>
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<div class="field">
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<label for="dotsType">Dot style</label>
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<select id="dotsType" v-model="options.dotsType">
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<option v-for="t in dotTypes" :key="t" :value="t">{{ t }}</option>
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</select>
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</div>
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<div class="field">
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<label for="dotsColor">Dot color</label>
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<input id="dotsColor" v-model="options.dotsColor" type="color" />
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</div>
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</fieldset>
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<fieldset>
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<legend>Corners</legend>
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<div class="field">
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<label for="csType">Outer square style</label>
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<select id="csType" v-model="options.cornersSquareType">
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<option v-for="t in cornerSquareTypes" :key="t" :value="t">{{ t }}</option>
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</select>
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</div>
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<div class="field">
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<label for="csColor">Outer square color</label>
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<input id="csColor" v-model="options.cornersSquareColor" type="color" />
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</div>
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<div class="field">
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<label for="cdType">Inner dot style</label>
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<select id="cdType" v-model="options.cornersDotType">
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<option v-for="t in cornerDotTypes" :key="t" :value="t">{{ t }}</option>
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</select>
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</div>
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<div class="field">
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<label for="cdColor">Inner dot color</label>
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<input id="cdColor" v-model="options.cornersDotColor" type="color" />
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</div>
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</fieldset>
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<fieldset>
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<legend>Background</legend>
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<div class="field">
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<label for="bg">Background color</label>
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<input id="bg" v-model="options.backgroundColor" type="color" />
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</div>
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<div class="field">
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<label>
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Size
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<span class="value">{{ options.size }} px</span>
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</label>
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<input v-model.number="options.size" type="range" min="160" max="640" step="20" />
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</div>
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</fieldset>
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</section>
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<section class="preview-pane">
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<div class="preview-card">
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<div ref="preview" class="preview"></div>
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</div>
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<div class="download">
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<button type="button" @click="download('png')">Download PNG</button>
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<button type="button" @click="download('svg')">Download SVG</button>
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</div>
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</section>
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</main>
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</div>
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</template>
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66
src/composables/useQrCode.ts
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66
src/composables/useQrCode.ts
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import { onMounted, shallowRef, watch, type Ref } from 'vue'
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import QRCodeStyling, {
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type DotType,
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type CornerSquareType,
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type CornerDotType,
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type FileExtension,
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} from 'qr-code-styling'
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export type QrOptions = {
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data: string
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size: number
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dotsType: DotType
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dotsColor: string
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cornersSquareType: CornerSquareType
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cornersSquareColor: string
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cornersDotType: CornerDotType
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cornersDotColor: string
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backgroundColor: string
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image: string | null
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imageMargin: number
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imageSize: number
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hideBackgroundDots: boolean
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}
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export function useQrCode(container: Ref<HTMLElement | null>, options: QrOptions) {
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const qr = shallowRef<QRCodeStyling | null>(null)
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onMounted(() => {
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qr.value = new QRCodeStyling(toLibOptions(options))
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if (container.value) qr.value.append(container.value)
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})
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watch(
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() => ({ ...options }),
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() => qr.value?.update(toLibOptions(options)),
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{ deep: true },
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)
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const download = (extension: FileExtension) => {
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qr.value?.download({ name: 'qrcode', extension })
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}
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return { download }
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}
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function toLibOptions(o: QrOptions) {
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return {
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width: o.size,
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height: o.size,
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type: 'svg' as const,
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data: o.data || ' ',
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image: o.image ?? undefined,
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margin: 0,
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qrOptions: { errorCorrectionLevel: 'H' as const },
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dotsOptions: { color: o.dotsColor, type: o.dotsType },
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backgroundOptions: { color: o.backgroundColor },
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cornersSquareOptions: { color: o.cornersSquareColor, type: o.cornersSquareType },
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cornersDotOptions: { color: o.cornersDotColor, type: o.cornersDotType },
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imageOptions: {
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crossOrigin: 'anonymous',
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margin: o.imageMargin,
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imageSize: o.imageSize,
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hideBackgroundDots: o.hideBackgroundDots,
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},
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}
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}
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242
src/style.css
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242
src/style.css
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:root {
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font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
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color-scheme: light;
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color: #0f172a;
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background: #f1f5f9;
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-webkit-font-smoothing: antialiased;
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text-rendering: optimizeLegibility;
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}
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* {
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box-sizing: border-box;
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}
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body {
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margin: 0;
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min-height: 100vh;
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}
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#app {
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min-height: 100vh;
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}
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.app {
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max-width: 1100px;
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margin: 0 auto;
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padding: 32px 24px 64px;
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}
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header {
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margin-bottom: 28px;
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}
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h1 {
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margin: 0 0 6px;
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font-size: 28px;
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font-weight: 700;
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letter-spacing: -0.01em;
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}
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.subtitle {
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margin: 0;
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color: #64748b;
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font-size: 15px;
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}
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main {
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display: grid;
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grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
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gap: 28px;
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align-items: start;
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}
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@media (max-width: 880px) {
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main {
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grid-template-columns: 1fr;
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}
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}
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.controls,
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.preview-card {
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background: #fff;
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border: 1px solid #e2e8f0;
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border-radius: 14px;
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padding: 20px;
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box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
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}
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.controls {
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display: flex;
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flex-direction: column;
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gap: 18px;
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}
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fieldset {
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border: 1px solid #e2e8f0;
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border-radius: 10px;
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padding: 14px 16px 16px;
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margin: 0;
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display: flex;
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flex-direction: column;
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gap: 12px;
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}
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legend {
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padding: 0 6px;
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font-size: 13px;
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font-weight: 600;
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color: #475569;
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text-transform: uppercase;
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letter-spacing: 0.06em;
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}
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.field {
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display: flex;
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flex-direction: column;
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gap: 6px;
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}
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.field label {
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font-size: 13px;
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font-weight: 500;
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color: #334155;
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display: flex;
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justify-content: space-between;
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gap: 8px;
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}
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.value {
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color: #64748b;
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font-variant-numeric: tabular-nums;
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font-weight: 400;
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}
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input[type="text"],
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select {
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width: 100%;
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padding: 9px 11px;
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border: 1px solid #cbd5e1;
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border-radius: 8px;
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font: inherit;
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background: #fff;
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transition: border-color 0.12s, box-shadow 0.12s;
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}
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input[type="text"]:focus,
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select:focus {
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outline: none;
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border-color: #6366f1;
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box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
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}
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input[type="color"] {
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width: 100%;
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height: 38px;
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padding: 2px;
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border: 1px solid #cbd5e1;
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border-radius: 8px;
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background: #fff;
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cursor: pointer;
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}
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input[type="range"] {
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width: 100%;
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accent-color: #6366f1;
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}
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input[type="file"] {
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font: inherit;
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font-size: 13px;
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}
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.checkbox {
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display: flex;
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align-items: center;
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gap: 8px;
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font-size: 13px;
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color: #334155;
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cursor: pointer;
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}
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.logo-actions {
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display: flex;
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align-items: center;
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gap: 12px;
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}
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.logo-thumb {
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width: 44px;
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height: 44px;
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object-fit: contain;
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border: 1px solid #e2e8f0;
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border-radius: 8px;
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background: #f8fafc;
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padding: 4px;
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}
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.preview-pane {
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display: flex;
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flex-direction: column;
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gap: 14px;
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position: sticky;
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top: 24px;
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}
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.preview-card {
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display: flex;
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align-items: center;
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justify-content: center;
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padding: 24px;
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min-height: 360px;
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}
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.preview {
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display: flex;
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}
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.preview svg,
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.preview canvas {
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display: block;
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max-width: 100%;
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height: auto;
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}
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.download {
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display: grid;
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grid-template-columns: 1fr 1fr;
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gap: 10px;
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}
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button {
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font: inherit;
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font-weight: 600;
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font-size: 14px;
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padding: 10px 14px;
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border-radius: 10px;
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border: 1px solid transparent;
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background: #4f46e5;
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color: #fff;
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cursor: pointer;
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transition: background 0.12s, transform 0.05s;
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}
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button:hover {
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background: #4338ca;
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}
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button:active {
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transform: translateY(1px);
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}
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button.ghost {
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background: transparent;
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color: #475569;
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border-color: #cbd5e1;
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padding: 6px 10px;
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font-size: 13px;
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}
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button.ghost:hover {
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background: #f1f5f9;
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color: #1e293b;
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}
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Reference in New Issue
Block a user