led.git - Gitblit

			@@ -159,6 +159,7 @@
			<uv-button type="primary" :plain="true" text="颜色" @click="changeColor()"></uv-button>
			<uv-button type="primary" :plain="true" text="单帧移动" @click="enterMoveMode()"></uv-button>
			<uv-button type="primary" :plain="true" text="多帧移动" @click="enterMultiMoveMode()"></uv-button>
			<uv-button type="primary" :plain="true" text="图片上传" @click="chooseImage()"></uv-button>
			<uv-button type="primary" :plain="true" text="文字" @click="addText()"></uv-button>
			<uv-button type="primary" :plain="true" text="清除" @click="clear()"></uv-button>
			<uv-button type="primary" :plain="true" text="保存" @click="clickSaveData"></uv-button>
			@@ -1256,6 +1257,111 @@
			});
			},

			// 选择图片(相册或拍照)
			chooseImage() {
			uni.chooseImage({
			count: 1,
			sizeType: ['compressed'],
			sourceType: ['album', 'camera'],
			success: (res) => {
			console.log('chooseImage', JSON.stringify(res))
			const tempFilePath = res.tempFilePaths[0]
			uni.showLoading({ title: '转换中', mask: true })
			this.imageToDotMatrix(tempFilePath).then(pixelArray => {
			this.pixelData = pixelArray
			uni.hideLoading()
			}).catch(err => {
			uni.hideLoading()
			console.error('图片转点阵失败：', err)
			uni.showToast({ title: '图片转点阵失败', icon: 'none' })
			})
			}
			})
			},
			// 将图片转成点数据,参考generateDotMatrix的采样逻辑
			imageToDotMatrix(imagePath) {
			return new Promise((resolve, reject) => {
			// 先获取图片信息,得到原始宽高用于按比例缩放
			uni.getImageInfo({
			src: imagePath,
			success: (imgInfo) => {
			const imgW = imgInfo.width
			const imgH = imgInfo.height
			if (!imgW \|\| !imgH) {
			reject(new Error('图片尺寸异常'))
			return
			}
			// 等比缩放,使图片完整包含在画布内并居中
			const scale = Math.min(this.canvasWidth / imgW, this.canvasHeight / imgH)
			const drawW = imgW * scale
			const drawH = imgH * scale
			const drawX = (this.canvasWidth - drawW) / 2
			const drawY = (this.canvasHeight - drawH) / 2

			ctx = uni.createCanvasContext('myCanvas', this)
			ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight)
			// 将缩放后的图片绘制到画布
			ctx.drawImage(imagePath, drawX, drawY, drawW, drawH)
			ctx.draw(false, () => {
			setTimeout(() => {
			uni.canvasGetImageData({
			canvasId: 'myCanvas',
			x: 0,
			y: 0,
			width: this.canvasWidth,
			height: this.canvasHeight,
			success: (res) => {
			console.log('canvasGetImageData', JSON.stringify(res))
			const imageData = res.data
			const colCount = this.width * (this.modeVal == 2 ? 10 : 1)
			const pixelArray = new Array(this.height * colCount).fill('')
			const cellWidth = this.canvasWidth / colCount
			const cellHeight = this.canvasHeight / this.height
			if (!imageData) {
			reject(new Error('读取图片像素数据异常'))
			return
			}
			// 按格子采样,判断每个格子是否为前景(暗)像素
			for (let y = 0; y < this.height; y++) {
			for (let x = 0; x < colCount; x++) {
			let darkPixels = 0
			let totalPixels = 0
			for (let py = 0; py < cellHeight; py++) {
			for (let px = 0; px < cellWidth; px++) {
			const pixelY = Math.floor(y * cellHeight + py)
			const pixelX = Math.floor(x * cellWidth + px)
			const idx = (pixelY * this.canvasWidth + pixelX) * 4
			const r = imageData[idx]
			const g = imageData[idx + 1]
			const b = imageData[idx + 2]
			const a = imageData[idx + 3]
			const brightness = 0.3 * r + 0.59 * g + 0.11 * b
			if (brightness < 128 && a > 128) {
			darkPixels++
			}
			totalPixels++
			}
			}
			const isDark = darkPixels / totalPixels > 0.3
			const arrayIndex = y * colCount + x
			pixelArray[arrayIndex] = isDark ? this.color : ''
			}
			}
			resolve(pixelArray)
			},
			fail: (err) => {
			reject(err)
			}
			})
			}, 1000)
			})
			},
			fail: (err) => {
			reject(err)
			}
			})
			})
			},
			openPreview() {
			if (this.fpsList.length === 0 \|\| this.fpsList.every(f => f === null \|\| f === undefined)) {
			uni.showToast({