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box.js
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box.js
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import {Element} from 'chart.js';
import {toPadding} from 'chart.js/helpers';
import {drawBox, drawLabel, getRelativePosition, measureLabelSize, getRectCenterPoint, getChartRect, toPosition, inBoxRange} from '../helpers';
export default class BoxAnnotation extends Element {
inRange(mouseX, mouseY, useFinalPosition) {
return inBoxRange(mouseX, mouseY, this.getProps(['x', 'y', 'width', 'height'], useFinalPosition), this.options.borderWidth);
}
inXRange(mouseX, mouseY, useFinalPosition) {
const {x: start, width: size} = this.getProps(['x', 'width'], useFinalPosition);
return inRangeByCoord(mouseX, start, size, this.options.borderWidth);
}
inYRange(mouseX, mouseY, useFinalPosition) {
const {y: start, height: size} = this.getProps(['y', 'height'], useFinalPosition);
return inRangeByCoord(mouseY, start, size, this.options.borderWidth);
}
getCenterPoint(useFinalPosition) {
return getRectCenterPoint(this.getProps(['x', 'y', 'width', 'height'], useFinalPosition));
}
draw(ctx) {
ctx.save();
drawBox(ctx, this, this.options);
ctx.restore();
}
drawLabel(ctx) {
const {x, y, width, height, options} = this;
const {label, borderWidth} = options;
const halfBorder = borderWidth / 2;
const position = toPosition(label.position);
const padding = toPadding(label.padding);
const labelSize = measureLabelSize(ctx, label);
const labelRect = {
x: calculateX(this, labelSize, position, padding),
y: calculateY(this, labelSize, position, padding),
width: labelSize.width,
height: labelSize.height
};
ctx.save();
ctx.beginPath();
ctx.rect(x + halfBorder + padding.left, y + halfBorder + padding.top,
width - borderWidth - padding.width, height - borderWidth - padding.height);
ctx.clip();
drawLabel(ctx, labelRect, label);
ctx.restore();
}
resolveElementProperties(chart, options) {
return getChartRect(chart, options);
}
}
BoxAnnotation.id = 'boxAnnotation';
BoxAnnotation.defaults = {
adjustScaleRange: true,
backgroundShadowColor: 'transparent',
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0,
borderJoinStyle: 'miter',
borderRadius: 0,
borderShadowColor: 'transparent',
borderWidth: 1,
cornerRadius: undefined, // TODO: v2 remove support for cornerRadius
display: true,
label: {
borderWidth: undefined,
color: 'black',
content: null,
drawTime: undefined,
enabled: false,
font: {
family: undefined,
lineHeight: undefined,
size: undefined,
style: undefined,
weight: 'bold'
},
height: undefined,
padding: 6,
position: 'center',
textAlign: 'start',
xAdjust: 0,
yAdjust: 0,
width: undefined
},
shadowBlur: 0,
shadowOffsetX: 0,
shadowOffsetY: 0,
xMax: undefined,
xMin: undefined,
xScaleID: 'x',
yMax: undefined,
yMin: undefined,
yScaleID: 'y'
};
BoxAnnotation.defaultRoutes = {
borderColor: 'color',
backgroundColor: 'color'
};
BoxAnnotation.descriptors = {
label: {
_fallback: true
}
};
function inRangeByCoord(value, start, size, borderWidth) {
const hBorderWidth = borderWidth / 2;
return value >= start - hBorderWidth && value <= start + size + hBorderWidth;
}
function calculateX(box, labelSize, position, padding) {
const {x: start, x2: end, width: size, options} = box;
const {xAdjust: adjust, borderWidth} = options.label;
return calculatePosition({start, end, size}, {
position: position.x,
padding: {start: padding.left, end: padding.right},
adjust, borderWidth,
size: labelSize.width
});
}
function calculateY(box, labelSize, position, padding) {
const {y: start, y2: end, height: size, options} = box;
const {yAdjust: adjust, borderWidth} = options.label;
return calculatePosition({start, end, size}, {
position: position.y,
padding: {start: padding.top, end: padding.bottom},
adjust, borderWidth,
size: labelSize.height
});
}
function calculatePosition(boxOpts, labelOpts) {
const {start, end} = boxOpts;
const {position, padding: {start: padStart, end: padEnd}, adjust, borderWidth} = labelOpts;
const availableSize = end - borderWidth - start - padStart - padEnd - labelOpts.size;
return start + borderWidth / 2 + adjust + padStart + getRelativePosition(availableSize, position);
}