vis.js is a dynamic, browser-based visualization library
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import NodeBase from '../util/NodeBase'
class CircleImageBase extends NodeBase {
constructor(options, body, labelModule) {
super(options, body, labelModule);
this.labelOffset = 0;
this.imageLoaded = false;
}
setOptions(options, imageObj) {
this.options = options;
if (imageObj) {
this.imageObj = imageObj;
}
}
/**
* This function resizes the image by the options size when the image has not yet loaded. If the image has loaded, we
* force the update of the size again.
*
* @private
*/
_resizeImage() {
let force = false;
if (!this.imageObj.width || !this.imageObj.height) { // undefined or 0
this.imageLoaded = false;
}
else if (this.imageLoaded === false) {
this.imageLoaded = true;
force = true;
}
if (!this.width || !this.height || force === true) { // undefined or 0
var width, height, ratio;
if (this.imageObj.width && this.imageObj.height) { // not undefined or 0
width = 0;
height = 0;
}
if (this.options.shapeProperties.useImageSize === false) {
if (this.imageObj.width > this.imageObj.height) {
ratio = this.imageObj.width / this.imageObj.height;
width = this.options.size * 2 * ratio || this.imageObj.width;
height = this.options.size * 2 || this.imageObj.height;
}
else {
if (this.imageObj.width && this.imageObj.height) { // not undefined or 0
ratio = this.imageObj.height / this.imageObj.width;
}
else {
ratio = 1;
}
width = this.options.size * 2;
height = this.options.size * 2 * ratio;
}
}
else {
// when not using the size property, we use the image size
width = this.imageObj.width;
height = this.imageObj.height;
}
this.width = width;
this.height = height;
this.radius = 0.5 * this.width;
}
}
_drawRawCircle(ctx, x, y, selected, hover, size) {
var neutralborderWidth = this.options.borderWidth;
var selectionLineWidth = this.options.borderWidthSelected || 2 * this.options.borderWidth;
var borderWidth = (selected ? selectionLineWidth : neutralborderWidth) / this.body.view.scale;
ctx.lineWidth = Math.min(this.width, borderWidth);
ctx.strokeStyle = selected ? this.options.color.highlight.border : hover ? this.options.color.hover.border : this.options.color.border;
ctx.fillStyle = selected ? this.options.color.highlight.background : hover ? this.options.color.hover.background : this.options.color.background;
ctx.circle(x, y, size);
// draw shadow if enabled
this.enableShadow(ctx);
// draw the background
ctx.fill();
// disable shadows for other elements.
this.disableShadow(ctx);
//draw dashed border if enabled, save and restore is required for firefox not to crash on unix.
ctx.save();
// if borders are zero width, they will be drawn with width 1 by default. This prevents that
if (borderWidth > 0) {
this.enableBorderDashes(ctx);
//draw the border
ctx.stroke();
//disable dashed border for other elements
this.disableBorderDashes(ctx);
}
ctx.restore();
}
_drawImageAtPosition(ctx) {
if (this.imageObj.width != 0) {
// draw the image
ctx.globalAlpha = 1.0;
// draw shadow if enabled
this.enableShadow(ctx);
let factor = (this.imageObj.width / this.width) / this.body.view.scale;
if (factor > 2 && this.options.shapeProperties.interpolation === true) {
let w = this.imageObj.width;
let h = this.imageObj.height;
var can2 = document.createElement('canvas');
can2.width = w;
can2.height = w;
var ctx2 = can2.getContext('2d');
factor *= 0.5;
w *= 0.5;
h *= 0.5;
ctx2.drawImage(this.imageObj, 0, 0, w, h);
let distance = 0;
let iterations = 1;
while (factor > 2 && iterations < 4) {
ctx2.drawImage(can2, distance, 0, w, h, distance+w, 0, w/2, h/2);
distance += w;
factor *= 0.5;
w *= 0.5;
h *= 0.5;
iterations += 1;
}
ctx.drawImage(can2, distance, 0, w, h, this.left, this.top, this.width, this.height);
}
else {
// draw image
ctx.drawImage(this.imageObj, this.left, this.top, this.width, this.height);
}
// disable shadows for other elements.
this.disableShadow(ctx);
}
}
_drawImageLabel(ctx, x, y, selected) {
var yLabel;
var offset = 0;
if (this.height !== undefined) {
offset = this.height * 0.5;
var labelDimensions = this.labelModule.getTextSize(ctx);
if (labelDimensions.lineCount >= 1) {
offset += labelDimensions.height / 2;
}
}
yLabel = y + offset;
if (this.options.label) {
this.labelOffset = offset;
}
this.labelModule.draw(ctx, x, yLabel, selected, 'hanging');
}
}
export default CircleImageBase;