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/**
* author: Samuel Gratzl
* email: samuel_gratzl@gmx.at
* created: 2016-10-28T11:19:52.797Z
*/
import {axisLeft, axisBottom} from 'd3-axis';
import {scaleLinear} from 'd3-scale';
import {select} from 'd3-selection';
import {quadtree, Quadtree} from 'd3-quadtree';
import {ISymbol, ISymbolRenderer, ERenderMode, SymbolUtils} from './symbol';
import {QuadtreeUtils, IBoundsPredicate} from './quadtree';
import {cssprefix, DEBUG, debuglog} from './constants';
import {AScatterplot,
fixScale,
IScale,
IScatterplotOptions,
IScalesObject,
EScaleAxes,
ERenderReason,
INormalizedScalesObject,
} from './AScatterplot';
//normalized range the quadtree is defined
const DEFAULT_NORMALIZED_RANGE = [0, 100];
/**
* a class for rendering a scatterplot in a canvas
*/
export class Scatterplot<T> extends AScatterplot<T, IScatterplotOptions<T>> {
protected readonly normalized2pixel: IScalesObject = {
x: scaleLinear(),
y: scaleLinear()
};
private readonly renderer: ISymbol<T>;
constructor(data: T[], root: HTMLElement, props?: Partial<IScatterplotOptions<T>>) {
super(root, <any>props);
this.props.xscale = fixScale(this.props.xscale, this.props.x, data, props ? props.xscale : null, props ? props.xlim : null);
this.props.yscale = fixScale(this.props.yscale, this.props.y, data, props ? props.yscale : null, props ? props.ylim : null);
this.renderer = SymbolUtils.createRenderer(this.props.symbol);
// generate aspect ratio right normalized domain
this.normalized2pixel.x.domain(DEFAULT_NORMALIZED_RANGE.map((d) => d*this.props.aspectRatio));
this.normalized2pixel.y.domain(DEFAULT_NORMALIZED_RANGE);
this.setDataImpl(data);
this.selectionTree = quadtree([], this.tree!.x(), this.tree!.y());
this.initDOM();
this.canvasDataLayer = <HTMLCanvasElement>this.parent.children[0];
this.canvasSelectionLayer = <HTMLCanvasElement>this.parent.children[1];
}
transformedScales(): IScalesObject {
const xscale = this.rescale(EScaleAxes.x, this.props.xscale);
const yscale = this.rescale(EScaleAxes.y, this.props.yscale);
return { x: xscale, y: yscale};
}
protected transformedNormalized2PixelScales(): INormalizedScalesObject {
const n2pX = this.rescale(EScaleAxes.x, this.normalized2pixel.x);
const n2pY = this.rescale(EScaleAxes.y, this.normalized2pixel.y);
return {n2pX, n2pY};
}
render(reason = ERenderReason.DIRTY, transformDelta = {x: 0, y: 0, kx: 1, ky: 1}): void {
if (this.checkResize()) {
//check resize
return this.resized();
}
const c = this.canvasDataLayer!;
const {marginLeft, marginTop, marginRight, marginBottom} = this.props;
const bounds = {x0: marginLeft, y0: marginTop, x1: c.clientWidth - marginRight, y1: c.clientHeight - marginBottom};
const boundsWidth = bounds.x1 - bounds.x0;
const boundsHeight = bounds.y1 - bounds.y0;
// emit render reason as string
this.emit(Scatterplot.EVENT_RENDER, ERenderReason[reason], transformDelta);
if (reason === ERenderReason.DIRTY) {
this.props.xscale.range([0, boundsWidth]);
this.props.yscale.range([boundsHeight, 0]);
this.normalized2pixel.x.range(this.props.xscale.range());
this.normalized2pixel.y.range(this.props.yscale.range());
}
//transform scale
const { x: xscale, y: yscale} = this.transformedScales();
const {n2pX, n2pY} = this.transformedNormalized2PixelScales();
const nx = (v: number) => n2pX.invert(v);
const ny = (v: number) => n2pY.invert(v);
//inverted y scale
const isNodeVisible = QuadtreeUtils.hasOverlap(nx(0), ny(boundsHeight), nx(boundsWidth), ny(0));
const renderInfo = {
zoomLevel: this.currentTransform.k
};
const border = this.props.canvasBorder;
const renderData = (isSelection = false) => {
const ctx = (isSelection ? this.canvasSelectionLayer : this.canvasDataLayer)!.getContext('2d')!;
ctx.clearRect(0, 0, c.width, c.height);
ctx.save();
ctx.rect(bounds.x0 - border, bounds.y0 - border, boundsWidth + border * 2, boundsHeight + border * 2);
ctx.clip();
const tree = isSelection ? this.selectionTree : this.tree;
const renderer = this.renderer(ctx, isSelection ? ERenderMode.SELECTED : ERenderMode.NORMAL, renderInfo);
const debug = !isSelection && DEBUG;
ctx.translate(bounds.x0, bounds.y0);
if (!isSelection && this.props.renderBackground != null) {
ctx.save();
this.props.renderBackground(ctx, xscale, yscale);
ctx.restore();
}
this.renderTree(ctx, tree!, renderer, xscale, yscale, isNodeVisible, debug);
if (isSelection && this.props.extras != null) {
ctx.save();
this.props.extras(ctx, xscale, yscale);
ctx.restore();
}
ctx.restore();
return ctx;
};
const renderSelection = typeof this.props.isSelectEvent !== 'function' && this.props.extras == null ? () => undefined : () => {
const ctx = renderData(true);
this.lasso.render(ctx);
};
const renderAxes = this.renderAxes.bind(this, xscale, yscale);
const clearAutoZoomRedraw = () => {
if (this.zoomHandle >= 0) {
//delete auto redraw timer
clearTimeout(this.zoomHandle);
this.zoomHandle = -1;
}
};
debuglog(ERenderReason[reason]);
//render logic
switch (reason) {
case ERenderReason.PERFORM_TRANSLATE:
clearAutoZoomRedraw();
this.transformData(c, bounds, boundsWidth, boundsHeight, transformDelta.x, transformDelta.y, transformDelta.kx, transformDelta.ky);
renderAxes();
renderSelection();
//redraw everything after a while, i.e stopped moving
this.zoomHandle = window.setTimeout(this.render.bind(this, ERenderReason.AFTER_TRANSLATE), this.props.zoomDelay);
break;
case ERenderReason.SELECTION_CHANGED:
renderSelection();
break;
case ERenderReason.AFTER_TRANSLATE:
//just data needed after translation
clearAutoZoomRedraw();
renderData();
break;
case ERenderReason.AFTER_SCALE_AND_TRANSLATE:
case ERenderReason.AFTER_SCALE:
//nothing current approach is to draw all
break;
//case ERenderReason.PERFORM_SCALE:
//case ERenderReason.PERFORM_SCALE_AND_TRANSLATE:
default:
clearAutoZoomRedraw();
renderData();
renderAxes();
renderSelection();
}
}
protected renderAxes(xscale: IScale, yscale: IScale) {
const left = axisLeft(yscale);
const bottom = axisBottom(xscale);
const $parent = select(this.parent);
this.setAxisFormat(left, 'y');
this.setAxisFormat(bottom, 'x');
$parent.select<SVGGElement>(`.${cssprefix}-axis-left > g`).call(left);
$parent.select<SVGGElement>(`.${cssprefix}-axis-bottom > g`).call(bottom);
}
private renderTree(ctx: CanvasRenderingContext2D, tree: Quadtree<T>, renderer: ISymbolRenderer<T>, xscale: IScale, yscale: IScale, isNodeVisible: IBoundsPredicate, debug = false) {
const {x, y} = this.props;
//function debugNode(color:string, x0:number, y0:number, x1:number, y1:number) {
// ctx.closePath();
// ctx.fillStyle = 'steelblue';
// ctx.fill();
// ctx.fillStyle = color;
// x0 = xscale(x0);
// y0 = yscale(y0);
// x1 = xscale(x1);
// y1 = yscale(y1);
// ctx.fillRect(Math.min(x0, x1), Math.min(y0, y1), Math.abs(x0 - x1), Math.abs(y0 - y1));
// ctx.beginPath();
//
//}
//debug stats
super.traverseTree(ctx, tree, renderer, xscale, yscale, isNodeVisible, debug, x, y);
}
static create<T>(data:T[], canvas:HTMLCanvasElement, options: IScatterplotOptions<T>):Scatterplot<T> {
return new Scatterplot(data, canvas, options);
}
}