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183 lines
4.9 KiB
183 lines
4.9 KiB
import NodeBase from '../util/NodeBase'
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/**
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* NOTE: This is a bad base class
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*
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* Child classes are:
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*
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* Image - uses *only* image methods
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* Circle - uses *only* _drawRawCircle
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* CircleImage - uses all
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*
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* TODO: Refactor, move _drawRawCircle to different module, derive Circle from NodeBase
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* Rename this to ImageBase
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* Consolidate common code in Image and CircleImage to base class
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*/
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class CircleImageBase extends NodeBase {
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constructor(options, body, labelModule) {
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super(options, body, labelModule);
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this.labelOffset = 0;
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this.selected = false;
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}
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setOptions(options, imageObj, imageObjAlt) {
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this.options = options;
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this.setImages(imageObj, imageObjAlt);
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}
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setImages(imageObj, imageObjAlt) {
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if (imageObj) {
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this.imageObj = imageObj;
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if (imageObjAlt) {
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this.imageObjAlt = imageObjAlt;
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}
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}
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}
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/**
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* Switch between the base and the selected image.
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*/
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switchImages(selected) {
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if ((selected && !this.selected) || (!selected && this.selected)) {
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let imageTmp = this.imageObj;
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this.imageObj = this.imageObjAlt;
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this.imageObjAlt = imageTmp;
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}
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// keep current state in memory
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this.selected = selected;
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}
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/**
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* Adjust the node dimensions for a loaded image.
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*
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* Pre: this.imageObj is valid
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*/
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_resizeImage() {
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var width, height;
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if (this.options.shapeProperties.useImageSize === false) {
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// Use the size property
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var ratio_width = 1;
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var ratio_height = 1;
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// Only calculate the proper ratio if both width and height not zero
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if (this.imageObj.width && this.imageObj.height) {
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if (this.imageObj.width > this.imageObj.height) {
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ratio_width = this.imageObj.width / this.imageObj.height;
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}
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else {
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ratio_height = this.imageObj.height / this.imageObj.width;
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}
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}
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width = this.options.size * 2 * ratio_width;
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height = this.options.size * 2 * ratio_height;
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}
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else {
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// Use the image size
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width = this.imageObj.width;
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height = this.imageObj.height;
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}
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this.width = width;
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this.height = height;
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this.radius = 0.5 * this.width;
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}
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_drawRawCircle(ctx, x, y, values) {
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var borderWidth = values.borderWidth / this.body.view.scale;
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ctx.lineWidth = Math.min(this.width, borderWidth);
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ctx.strokeStyle = values.borderColor;
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ctx.fillStyle = values.color;
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ctx.circle(x, y, values.size);
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// draw shadow if enabled
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this.enableShadow(ctx, values);
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// draw the background
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ctx.fill();
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// disable shadows for other elements.
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this.disableShadow(ctx, values);
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//draw dashed border if enabled, save and restore is required for firefox not to crash on unix.
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ctx.save();
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// if borders are zero width, they will be drawn with width 1 by default. This prevents that
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if (borderWidth > 0) {
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this.enableBorderDashes(ctx, values);
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//draw the border
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ctx.stroke();
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//disable dashed border for other elements
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this.disableBorderDashes(ctx, values);
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}
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ctx.restore();
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}
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_drawImageAtPosition(ctx, values) {
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if (this.imageObj.width != 0) {
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// draw the image
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ctx.globalAlpha = 1.0;
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// draw shadow if enabled
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this.enableShadow(ctx, values);
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let factor = (this.imageObj.width / this.width) / this.body.view.scale;
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if (factor > 2 && this.options.shapeProperties.interpolation === true) {
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let w = this.imageObj.width;
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let h = this.imageObj.height;
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var can2 = document.createElement('canvas');
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can2.width = w;
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can2.height = w;
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var ctx2 = can2.getContext('2d');
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factor *= 0.5;
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w *= 0.5;
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h *= 0.5;
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ctx2.drawImage(this.imageObj, 0, 0, w, h);
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let distance = 0;
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let iterations = 1;
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while (factor > 2 && iterations < 4) {
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ctx2.drawImage(can2, distance, 0, w, h, distance+w, 0, w/2, h/2);
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distance += w;
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factor *= 0.5;
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w *= 0.5;
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h *= 0.5;
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iterations += 1;
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}
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ctx.drawImage(can2, distance, 0, w, h, this.left, this.top, this.width, this.height);
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}
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else {
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// draw image
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ctx.drawImage(this.imageObj, this.left, this.top, this.width, this.height);
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}
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// disable shadows for other elements.
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this.disableShadow(ctx, values);
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}
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}
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_drawImageLabel(ctx, x, y, selected, hover) {
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var yLabel;
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var offset = 0;
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if (this.height !== undefined) {
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offset = this.height * 0.5;
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var labelDimensions = this.labelModule.getTextSize(ctx, selected, hover);
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if (labelDimensions.lineCount >= 1) {
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offset += labelDimensions.height / 2;
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}
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}
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yLabel = y + offset;
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if (this.options.label) {
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this.labelOffset = offset;
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}
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this.labelModule.draw(ctx, x, yLabel, selected, hover, 'hanging');
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}
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}
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export default CircleImageBase;
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