Roughly implement annotation navigator.
<template>
<div class="zoom">
<div>
<svg ref="svg"
v-bind:class="{ 'cut-canvas': true, 'canvas--rect': mode === 'rect', 'canvas--free': mode === 'free' }"
xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<image ref="image" v-if="loaded" xmlns:xlink="http://www.w3.org/1999/xlink" v-bind:xlink:href="image" x="0" y="0" />
<!-- This slot may contain annotation data -->
<slot></slot>
<shape-rect ref="rect" v-show="loaded && mode == 'rect'"
v-bind:paper="paper" v-bind:original-annotation="annotation"></shape-rect>
<shape-free ref="free" v-show="loaded && mode == 'free'"
v-bind:paper="paper" v-bind:original-annotation="annotation"></shape-free>
</svg>
</div>
<div class="zoomer">
<div class="btn-group-vertical" role="group" aria-label="...">
<button @click="zoomIn" type="button" class="btn btn-default"><i class="fa fa-plus" aria-hidden="true"></i></button>
<button @click="zoomOut" type="button" class="btn btn-default"><i class="fa fa-minus" aria-hidden="true"></i></button>
</div>
</div>
<div class="mode-controls">
<div class="btn-group" role="group" aria-label="...">
<button @click="mode = 'rect'" type="button" v-bind:class="{ btn: true, 'btn-default': true, 'btn-primary': mode === 'rect'}">
<svg width="24" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" x="0px" y="0px" viewBox="0 0 512 512" enable-background="new 0 0 512 512" xml:space="preserve"><g><rect x="352" y="432" width="64" height="48"/><polygon points="416,352 416,96 176,96 176,160 352,160 352,352 160,352 160,32 96,32 96,96 32,96 32,160 96,160 96,416 480,416 480,352"/></g><text x="0" y="527" fill="#000000" font-size="5px" font-weight="bold" font-family="'Helvetica Neue', Helvetica, Arial-Unicode, Arial, Sans-serif">Created by Bluetip Design</text><text x="0" y="532" fill="#000000" font-size="5px" font-weight="bold" font-family="'Helvetica Neue', Helvetica, Arial-Unicode, Arial, Sans-serif">from the Noun Project</text></svg>
</button>
<button @click="mode = 'free'" type="button" v-bind:class="{ btn: true, 'btn-default': true, 'btn-primary': mode === 'free'}">
<svg width="24" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" x="0px" y="0px" viewBox="0 0 30 30" xml:space="preserve"><g transform="translate(-450 -380)"><g xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><path d="M453,395c0,2.209,1.79,4,4,4c1.307,0,2.455-0.635,3.186-1.604l7.121,4.069C467.11,401.938,467,402.456,467,403 c0,2.209,1.79,4,4,4c2.209,0,4-1.791,4-4s-1.791-4-4-4c-1.307,0-2.455,0.635-3.186,1.604l-7.121-4.069 c0.196-0.473,0.307-0.99,0.307-1.534s-0.11-1.062-0.307-1.534l7.121-4.069c0.73,0.969,1.879,1.604,3.186,1.604 c2.209,0,4-1.791,4-4s-1.791-4-4-4c-2.21,0-4,1.791-4,4c0,0.544,0.11,1.062,0.307,1.534l-7.121,4.069 c-0.73-0.969-1.879-1.604-3.186-1.604C454.79,391,453,392.791,453,395z M471,400c1.654,0,3,1.346,3,3s-1.346,3-3,3s-3-1.346-3-3 S469.346,400,471,400z M471,384c1.654,0,3,1.346,3,3s-1.346,3-3,3s-3-1.346-3-3S469.346,384,471,384z M460,395 c0,1.654-1.346,3-3,3s-3-1.346-3-3s1.346-3,3-3S460,393.346,460,395z"/></g></g><text x="0" y="45" fill="#000000" font-size="5px" font-weight="bold" font-family="'Helvetica Neue', Helvetica, Arial-Unicode, Arial, Sans-serif">Created by Hea Poh Lin</text><text x="0" y="50" fill="#000000" font-size="5px" font-weight="bold" font-family="'Helvetica Neue', Helvetica, Arial-Unicode, Arial, Sans-serif">from the Noun Project</text></svg>
</button>
</path>
</div>
</div>
</template>
<script>
import Snap from 'snapsvg'
import ShapeRect from './ShapeRect.vue'
import ShapeFree from './ShapeFree.vue'
export default {
props: {
image: String,
tooltip: {
type: Boolean,
default: function () {
return false;
}
},
},
components: {
shapeRect: ShapeRect,
shapeFree: ShapeFree
},
data() {
return {
paper: null,
loaded: false,
mode: 'rect',
viewport: { width: 0, height: 0 },
viewBox: [0 , 0, 0, 0],
zoomFactor: 0.1,
scale: 1,
imgMinSize: 0,
imageWidth: 0,
imageHeight: 0,
annotation: null
}
},
watch: {
mode: function(mode) {
this.reset();
if (mode === 'free') {
this.handleDrawFree();
}
if (mode === 'rect') {
this.handleDrawRect();
}
},
loaded: function(loaded) {
if (!loaded) { return; }
if (this.annotation) {
this.loadAnnotation();
} else {
if (this.mode === 'free') {
this.handleDrawFree();
}
if (this.mode === 'rect') {
this.handleDrawRect();
}
}
},
annotation: function(annotation) {
this.reset();
if (!this.annotation) { return; }
this.loadAnnotation();
}
},
mounted() {
var img = new Image();
img.onload = (e) => {
this.paper = new Snap(this.$refs.svg);
this.imgMinSize = Math.min(img.width, img.height);
// FIXME
// Image is actually NOT loaded at this step
setTimeout(() => {
console.log('Viewport: %s x %s',
this.paper.node.clientWidth, this.paper.node.clientHeight);
var viewBox = [0 , 0, img.width, img.height];
var viewport = {
width: this.paper.node.clientWidth,
height: this.paper.node.clientHeight
};
Object.assign(this, {
imageWidth: img.width,
imageHeight: img.height,
viewBox: viewBox,
viewport: viewport,
});
var handlerSize = 15 * Math.min(viewBox[2], viewBox[3]) / viewport.width;
this.$refs.rect.handlerSize = handlerSize;
this.$refs.free.handlerRadius = handlerSize / 2;
this.paper.attr({"viewBox": this.viewBox});
this.loaded = true;
}, 100);
}
img.src = this.image;
},
methods: {
reset: function() {
// Clear shapes
this.$refs.rect.clear();
this.$refs.free.clear();
this.removeEventHandlers();
if (this.mode === 'free') {
this.handleDrawFree();
}
if (this.mode === 'rect') {
this.handleDrawRect();
}
},
removeEventHandlers: function() {
this.paper.unmousedown();
this.paper.unmousemove();
this.paper.unmouseup();
this.paper.unclick();
},
setAnnotation: function(annotation) {
this.annotation = annotation;
},
loadAnnotation: function() {
if (this.annotation.fragment.length > 0) {
var pieces = this.annotation.fragment.split(';');
var path = pieces[0];
var mode = pieces[1].toLowerCase();
this.mode = mode;
this.$nextTick(() => {
path = this.denormalizePath(path);
if (mode === 'free') {
this.$refs.free.fromSVGPath(path, this.tooltip);
}
if (mode === 'rect') {
this.$refs.rect.fromSVGPath(path, this.tooltip);
}
});
}
},
getCenter: function() {
return {
x: this.viewBox[0] + (this.viewBox[2] / 2),
y: this.viewBox[1] + (this.viewBox[3] / 2)
}
},
resetZoom: function() {
this.scale = 1;
this.viewBox = [0, 0, this.imageWidth, this.imageHeight];
this.paper.attr({ "viewBox": this.viewBox });
},
zoomIn: function() {
if ( this.scale === 9) { this.scale--; return; }
var center = this.getCenter();
var scaleFactor = this.zoomFactor * this.scale;
var viewBoxW = this.imgMinSize - (this.imgMinSize * scaleFactor);
var viewBoxH = viewBoxW;
const viewBoxPrev = this.viewBox.slice(0);
this.viewBox[0] = center.x - viewBoxW / 2;
this.viewBox[1] = center.y - viewBoxH / 2;
this.viewBox[2] = viewBoxW;
this.viewBox[3] = viewBoxH;
this.scale++;
// this.paper.attr({ "viewBox": this.viewBox });
this.$refs.rect.hideTooltip();
Snap.animate(
viewBoxPrev, this.viewBox,
(viewBox) => this.paper.attr({ "viewBox": viewBox }),
300, mina.easeinout,
() => this.$refs.rect.showTooltip()
);
},
zoomOut: function() {
if (this.scale === 1) { this.resetZoom(); return; }
var center = this.getCenter();
var scaleFactor = this.zoomFactor * (this.scale - 1);
var viewBoxW = this.imgMinSize - (this.imgMinSize * scaleFactor);
var viewBoxH = viewBoxW;
var topX = center.x - viewBoxW / 2;
var topY = center.y - viewBoxH / 2;
const viewBoxPrev = this.viewBox.slice(0);
this.viewBox[0] = topX; //deal with X and Y
this.viewBox[1] = topY;
this.viewBox[2] = viewBoxW;
this.viewBox[3] = viewBoxH;
this.scale--;
// this.paper.attr({ "viewBox": this.viewBox });
this.$refs.rect.hideTooltip();
Snap.animate(
viewBoxPrev, this.viewBox,
(viewBox) => this.paper.attr({ "viewBox": viewBox }),
300, mina.easeinout,
() => this.$refs.rect.showTooltip()
);
},
zoomOffset: function() {
return {
x: this.viewport.width / this.viewBox[2],
y: this.viewport.height / this.viewBox[3]
};
},
computeOffset: function(e) {
var rect = this.$refs.image.getBoundingClientRect();
var zoomOffset = this.zoomOffset();
var offsetX = (e.clientX - rect.left) / Math.min(zoomOffset.x, zoomOffset.y);
var offsetY = (e.clientY - rect.top) / Math.min(zoomOffset.x, zoomOffset.y);
return { x: offsetX, y: offsetY };
},
computeHandlerSize: function(e) {
return 60 * Math.min(this.viewBox[2], this.viewBox[3]) / this.imageWidth;
},
normalizePath: function(path) {
var xRatio = 100 / this.imageWidth;
var yRatio = 100 / this.imageHeight;
if (isNaN(xRatio) || isNaN(yRatio)) {
throw new Error('Ratio should be a number.');
}
var normalizeMatrix = Snap.matrix(xRatio, 0, 0, yRatio, 0, 0);
path = Snap.path.map(path, normalizeMatrix).toString();
if (path.search(/[z|Z]/gi) === -1) {
path += " Z";
}
return path;
},
denormalizePath: function(path) {
var xRatio = this.imageWidth / 100;
var yRatio = this.imageHeight / 100;
if (isNaN(xRatio) || isNaN(yRatio)) {
throw new Error('Ratio should be a number.');
}
var transformMatrix = Snap.matrix(xRatio, 0, 0, yRatio, 0, 0);
path = Snap.path.map(path, transformMatrix).toString();
if (path.search(/[z|Z]/gi) === -1) {
path += " Z";
}
return path;
},
toSVGPath: function() {
if (this.mode === 'free') {
this.$refs.free.toSVGPath();
}
if (this.mode === 'rect') {
this.$refs.rect.toSVGPath();
}
},
handleDrawFree: function() {
this.removeEventHandlers();
var clickTimeout;
var clickHandler = function (offsetX, offsetY) {
clickTimeout = null;
this.$refs.free.addPoint(offsetX, offsetY);
}
this.paper.click((e) => {
if (clickTimeout) { return; }
if (!$(e.target).is('image')) { return; }
if (this.$refs.free.closed) { return; }
var offset = this.computeOffset(e);
var offsetX = offset.x;
var offsetY = offset.y;
clickTimeout = setTimeout(clickHandler.bind(this, offsetX, offsetY), 190);
});
},
handleDrawRect: function() {
this.removeEventHandlers();
var startPosition = { x: 0, y: 0 };
var currentPosition = { x: 0, y: 0 };
var canDraw = false;
var computeOffset = (e) => {
var rect = this.$refs.image.getBoundingClientRect();
var zoomOffset = this.zoomOffset();
var offsetX = (e.clientX - rect.left) / Math.min(zoomOffset.x, zoomOffset.y);
var offsetY = (e.clientY - rect.top) / Math.min(zoomOffset.x, zoomOffset.y);
return { x: offsetX, y: offsetY };
}
this.paper.mousedown((e) => {
if (this.$refs.rect.width > 0 && this.$refs.rect.height > 0) { return; }
startPosition = computeOffset(e);
canDraw = true;
});
this.paper.mousemove((e) => {
if (!canDraw) { return; }
var x, y;
currentPosition = computeOffset(e);
/* bas -> droite */
var width = Math.abs(currentPosition.x - startPosition.x);
var height = Math.abs(startPosition.y - currentPosition.y);
if (currentPosition.y > startPosition.y && currentPosition.x > startPosition.x) {
x = startPosition.x;
y = startPosition.y;
}
/* haut -> droite */
if (currentPosition.y < startPosition.y && currentPosition.x > startPosition.x) {
x = currentPosition.x - width;
y = currentPosition.y;
}
/* haut -> gauche */
if (currentPosition.y < startPosition.y && currentPosition.x < startPosition.x) {
x = currentPosition.x;
y = currentPosition.y;
}
/* bas -> gauche */
if (currentPosition.y > startPosition.y && currentPosition.x < startPosition.x) {
x = currentPosition.x
y = currentPosition.y - height;
}
if(!x || !y) { return; }
Object.assign(this.$refs.rect, {
x: x,
y: y,
width: width,
height: height,
});
});
this.paper.mouseup((e) => {
if (!canDraw) { return; }
canDraw = false;
if (this.$refs.rect.width === 0 && this.$refs.rect.height === 0) {
var currentPosition = computeOffset(e);
Object.assign(this.$refs.rect, {
x: currentPosition.x,
y: currentPosition.y,
width: this.imgMinSize / 4,
height: this.imgMinSize / 4,
});
}
this.$nextTick(() => {
this.$refs.rect.addResizeHandlers();
this.$refs.rect.addTooltip();
});
});
}
}
}
</script>
<style scoped>
.zoom {
position: relative;
}
.zoomer {
position: absolute;
bottom: 30px;
right: 30px;
}
.cut-canvas {
width: 100%;
height: 600px;
}
.canvas--rect:hover {
cursor: crosshair;
}
.canvas--free:hover {
cursor: pointer;
}
.mode-controls {
position: absolute;
top: 15px;
left: 15px;
}
.mode-controls .btn > svg {
margin-top: 4px;
}
.mode-controls .btn-primary > svg {
fill: #fff;
}
</style>