VueJS पर सरल छवि संपादक

<Edit> <Preview v-if="image" ref="preview" :matrix="matrix" :image="image" :transform="transform" @resized="areaResized" @loaded="imageLoaded" @moved="imageMoved" /> <input type="range" :min="minZoom" :max="maxZoom" step="any" @change="onZoomEnd" v-model.number="transform.zoom" :disabled="!imageReady" /> <button @click="rotateMinus" :disabled="!imageReady">Rotate left</button> <button @click="rotatePlus" :disabled="!imageReady">Rotate right</button> <button @click="flipY" :disabled="!imageReady">Flip horizontal</button> <button @click="flipX" :disabled="!imageReady">Flip vertical</button> </Edit> 

 export default { components: { Preview }, data () { return { image: null, imageReady: false, imageRect: {}, //   areaRect: {}, //   minZoom: 1, //   maxZoom: 1, //   //   transform: { center: { x: 0, y: 0, }, zoom: 1, rotate: 0, flip: false, flop: false, x: 0, y: 0 } } }, computed: { matrix() { let scaleX = this.transform.flop ? -this.transform.zoom : this.transform.zoom; let scaleY = this.transform.flip ? -this.transform.zoom : this.transform.zoom; let tx = this.transform.x; let ty = this.transform.y; const cos = Math.cos(this.transform.rotate * Math.PI / 180); const sin = Math.sin(this.transform.rotate * Math.PI / 180); let a = Math.round(cos)*scaleX; let b = Math.round(sin)*scaleX; let c = -Math.round(sin)*scaleY; let d = Math.round(cos)*scaleY; return { a, b, c, d, tx, ty }; } }, ... } 

  _setMinZoom(){ let rotate = this.matrix.c !== 0; let horizontal = this.imageRect.size.height < this.imageRect.size.width; let areaSize = (horizontal && !rotate || !horizontal && rotate) ? this.areaRect.size.width : this.areaRect.size.height; let imageSize = horizontal ? this.imageRect.size.width : this.imageRect.size.height; this.minZoom = areaSize/imageSize; if(this.transform.zoom < this.minZoom) this.transform.zoom = this.minZoom; }, _setMaxZoom(){ this.maxZoom = this.areaRect.size.width/config.image.minResolution; if(this.transform.zoom > this.maxZoom) this.transform.zoom = this.maxZoom; }, 

 flipX(){ this.matrix.b == 0 && this.matrix.c == 0 ? this.transform.flip = !this.transform.flip : this.transform.flop = !this.transform.flop; }, flipY(){ this.matrix.b == 0 && this.matrix.c == 0 ? this.transform.flop = !this.transform.flop : this.transform.flip = !this.transform.flip; }, 

 onZoomEnd(){ this._translate(); }, rotatePlus(){ this.transform.rotate += 90; this._setMinZoom(); this._translate(); }, rotateMinus(){ this.transform.rotate -= 90; this._setMinZoom(); this._translate(); }, imageMoved(translate){ this._translate(); }, 

 class Transform { constructor(center, matrix){ this.init(center, matrix); } init(center, matrix){ if(center) this.center = Object.assign({},center); if(matrix) this.matrix = Object.assign({},matrix); } getOrigins(current){ //     let tr = {x: current.x - this.center.x, y: current.y - this.center.y}; //         const det = 1/(this.matrix.a*this.matrix.d - this.matrix.c*this.matrix.b); const x = ( this.matrix.d*(tr.x - this.matrix.tx) - this.matrix.c*(tr.y - this.matrix.ty) ) * det + this.center.x; const y = (-this.matrix.b*(tr.x - this.matrix.tx) + this.matrix.a*(tr.y - this.matrix.ty) ) * det + this.center.y; return {x, y}; } translate(current){ //     const origin = {x: current.x - this.center.x, y: current.y - this.center.y}; //        let x = this.matrix.a*origin.x + this.matrix.c*origin.y + this.matrix.tx + this.center.x; let y = this.matrix.b*origin.x + this.matrix.d*origin.y + this.matrix.ty + this.center.y; return {x, y}; } } 

 _translate(checkAlign = true){ const tr = new Transform(this.transform.center, this.matrix); // , ,  ,       const newCenter = tr.getOrigins(this.areaRect.center); this.transform.center = newCenter; //      this.transform.x = this.areaRect.center.x - newCenter.x; this.transform.y = this.areaRect.center.y - newCenter.y; //   tr.init(this.transform.center, this.matrix); //        ,      let x0y0 = tr.translate({x: 0, y: 0}); let x1y1 = tr.translate({x: this.imageRect.size.width, y: this.imageRect.size.height}); //  (  )       let result = { left: x1y1.x - x0y0.x > 0 ? x0y0.x : x1y1.x, top: x1y1.y - x0y0.y > 0 ? x0y0.y : x1y1.y, width: Math.abs(x1y1.x - x0y0.x), height: Math.abs(x1y1.y - x0y0.y) }; //       ,   "" let rightOffset = this.areaRect.size.width - (result.left + result.width); let bottomOffset = this.areaRect.size.height - (result.top + result.height); let alignedCenter; //   if(this.areaRect.size.width - result.width > 1){ //align center X alignedCenter = tr.getOrigins({x: result.left + result.width/2, y: this.areaRect.center.y}); }else{ //align left if(result.left > 0){ alignedCenter = tr.getOrigins({x: result.left + this.areaRect.center.x, y: this.areaRect.center.y}); //align right }else if(rightOffset > 0){ alignedCenter = tr.getOrigins({x: this.areaRect.center.x - rightOffset, y: this.areaRect.center.y}); } } if(alignedCenter){ this.transform.center = alignedCenter; this.transform.x = this.areaRect.center.x - alignedCenter.x; this.transform.y = this.areaRect.center.y - alignedCenter.y; tr.init(this.transform.center, this.matrix); } //   if(this.areaRect.size.height - result.height > 1){ //align center Y alignedCenter = tr.getOrigins({x: this.areaRect.center.x, y: result.top + result.height/2}); }else{ //align top if(result.top > 0){ alignedCenter = tr.getOrigins({x: this.areaRect.center.x, y: result.top + this.areaRect.center.y}); //align bottom }else if(bottomOffset > 0){ alignedCenter = tr.getOrigins({x: this.areaRect.center.x, y: this.areaRect.center.y - bottomOffset}); } } if(alignedCenter){ this.transform.center = alignedCenter; this.transform.x = this.areaRect.center.x - alignedCenter.x; this.transform.y = this.areaRect.center.y - alignedCenter.y; tr.init(this.transform.center, this.matrix); } },