質問編集履歴
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ehnko
test
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test
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@@ -231,3 +231,247 @@
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[リンク内容](https://codepen.io/anon/pen/REyjVp?editors=1111)
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[リンク内容](http://www.html5.jp/canvas/how6.html)
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# 追記
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yhgさんの通りコードを書きましたが、エラーが表示されるようになりました。
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```
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Failed to execute 'readAsDataURL' on 'FileReader': parameter 1 is not of type 'Blob'.
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```
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```
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//image.vue
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<template>
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<div>
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<div v-for="image in layer">
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<img v-show="uploadedImage" :src="uploadedImage" />
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<input type="file" ref="file" @change="onFileChange"/>
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<el-button @click="setImage(image)">反映</el-button>
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</div>
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</div>
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</template>
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<script>
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export default {
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props: ['tmp_template'],
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data() {
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return {
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uploadedImage: ""
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}
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},
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computed: {
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layer() {
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return this.tmp_template.layers.filter(function(layer) {
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if (layer.type === 'image') {
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return layer
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}
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})
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},
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},
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methods: {
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//今回追加文
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getDataURI(file) {
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return new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.readAsDataURL(file)
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reader.onload = () => resolve(reader, result)
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reader.onerror = error => reject(error)
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})
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},
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viewValue() {
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//previe.vueの関数
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this.$emit('viewValue')
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},
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onFileChange(file) {
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const elFile = this.$refs.file
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const files = elFile[0].files[0]
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//関数代入
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this.uploadedImage = this.getDataURI(files)
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},
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setImage(image) {
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image.value = this.uploadedImage
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this.viewValue()
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}
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},
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}
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</script>
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```
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```
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//preview.vue
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<template>
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<div>
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<div style="width:1360px;height:250px;padding:50px;border:solid 1px #DDD;background-color:#FFFFFF;overflow:scroll">
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<canvas id="preview" :style="{
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border: 'solid 1px #000',
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'background-color': '#FFFFFF',
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}">
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</canvas>
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</div>
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</div>
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</template>
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<script>
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export default {
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data() {
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return {}
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},
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props: ['tmp_template'],
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mounted() {
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this.ctx = this.$el.firstChild.firstElementChild.getContext('2d')
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this.drawCreative()
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},
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methods: {
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//Canvas生成
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drawCreative() {
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this.ctx.canvas.width = this.tmp_template.width
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this.ctx.canvas.height = this.tmp_template.height
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this.ctx.beginPath()
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this.ctx.clearRect(0, 0, this.tmp_template.width, this.tmp_template.height)
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this.tmp_template.layers.forEach(layer => {
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this.ctx.strokeStyle = this.setTypeColor(layer.type)
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if(layer.type === 'text' && layer.value) {
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this.ctx.fillText(layer.value, layer.x_position, layer.y_position - -10)
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}
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else if(layer.type === 'image' && layer.value)
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{
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//画像表示処理
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let image1 = new Image()
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let reader = new FileReader()
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image1.src = layer.value.name
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reader.onload = (e) => {
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this.ctx.drawImage(image1, 0, 0)
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};
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reader.readAsDataURL(layer.value);
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}
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this.ctx.strokeRect(layer.x_position, layer.y_position, layer.width, layer.height)
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})
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this.ctx.fill()
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},
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},
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}
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</script>
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```
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