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156 lines
4.3 KiB
156 lines
4.3 KiB
import NodeBase from './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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if (!(imageObj === undefined && imageObjAlt === undefined)) {
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this.setImages(imageObj, imageObjAlt);
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}
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}
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/**
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* Set the images for this node.
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*
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* The images can be updated after the initial setting of options;
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* therefore, this method needs to be reentrant.
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*
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* For correct working in error cases, it is necessary to properly set
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* field 'nodes.brokenImage' in the options.
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*
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* @param {Image} imageObj required; main image to show for this node
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* @param {Image|undefined} imageObjAlt optional; image to show when node is selected
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*/
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setImages(imageObj, imageObjAlt) {
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if (imageObjAlt && this.selected) {
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this.imageObj = imageObjAlt;
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this.imageObjAlt = imageObj;
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} else {
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this.imageObj = imageObj;
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this.imageObjAlt = imageObjAlt;
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}
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}
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/**
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* Set selection and switch between the base and the selected image.
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*
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* Do the switch only if imageObjAlt exists.
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*
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* @param {true|false} selected value of new selected state for current node
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*/
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switchImages(selected) {
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var selection_changed = ((selected && !this.selected) || (!selected && this.selected));
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this.selected = selected; // Remember new selection
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if (this.imageObjAlt !== undefined && selection_changed) {
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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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}
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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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this.initContextForDraw(ctx, values);
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ctx.circle(x, y, values.size);
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this.performFill(ctx, values);
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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 = 1;
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if (this.options.shapeProperties.interpolation === true) {
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factor = (this.imageObj.width / this.width) / this.body.view.scale;
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}
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this.imageObj.drawImageAtPosition(ctx, factor, this.left, this.top, this.width, this.height);
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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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