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feat: optimize traffic graph quadratic curve

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GyDi 2022-04-16 22:32:44 +08:00
parent 1b8d70322b
commit ab7313cbc4
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GPG Key ID: 1C95E0D3467B3084
1 changed files with 29 additions and 39 deletions
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68
src/components/layout/traffic-graph.tsx
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@ -13,7 +13,7 @@ const downLineAlpha = 1;
const downLineWidth = 4;
const duration = 16 / 1000;
const defaultList = Array(maxPoint + 1).fill({ up: 0, down: 0 });
const defaultList = Array(maxPoint + 2).fill({ up: 0, down: 0 });
type TrafficData = { up: number; down: number };
@ -47,7 +47,7 @@ const TrafficGraph = (props: Props) => {
cache = null;
const list = listRef.current;
if (list.length > maxPoint + 1) list.shift();
if (list.length > maxPoint + 2) list.shift();
list.push(data);
countRef.current = 0;
@ -108,50 +108,40 @@ const TrafficGraph = (props: Props) => {
};
const drawBezier = (list: number[]) => {
const count = countRef.current;
const offset = Math.min(1, count * duration);
const offsetX = dx * offset;
const o = dx * Math.min(1, countRef.current * duration);
const points = list.map((y, i) => [
(dx * (i - 1) - o + 3) | 0,
countY(y),
]);
let lx = 0;
let ly = height;
let llx = 0;
let lly = height;
let x = points[0][0];
let y = points[0][1];
list.forEach((val, index) => {
const x = (dx * index - offsetX) | 0;
const y = countY(val);
const s = 0.25;
context.moveTo(x, y);
if (index === 0) context.moveTo(x, y);
else {
let nx = (dx * (index + 1)) | 0;
let ny = index < maxPoint - 1 ? countY(list[index + 1]) | 0 : 0;
const ax = (lx + (x - llx) * s) | 0;
const ay = (ly + (y - lly) * s) | 0;
const bx = (x - (nx - lx) * s) | 0;
const by = (y - (ny - ly) * s) | 0;
context.bezierCurveTo(ax, ay, bx, by, x, y);
}
for (let i = 1; i < points.length; i++) {
const p1 = points[i];
const p2 = points[i + 1] || p1;
llx = lx;
lly = ly;
lx = x;
ly = y;
});
const x1 = (p1[0] + p2[0]) / 2;
const y1 = (p1[1] + p2[1]) / 2;
context.quadraticCurveTo(p1[0], p1[1], x1, y1);
x = x1;
y = y1;
}
};
const drawLine = (list: number[]) => {
const count = countRef.current;
const offset = Math.min(1, count * duration);
const offsetX = dx * offset;
const o = dx * Math.min(1, countRef.current * duration);
const points = list.map((y, i) => [(dx * (i - 1) - o) | 0, countY(y)]);
list.forEach((val, index) => {
const x = (dx * index - offsetX) | 0;
const y = countY(val);
context.moveTo(points[0][0], points[0][1]);
if (index === 0) context.moveTo(x, y);
else context.lineTo(x, y);
});
for (let i = 1; i < points.length; i++) {
const p = points[i];
context.lineTo(p[0], p[1]);
}
};
const drawGraph = () => {
@ -177,7 +167,7 @@ const TrafficGraph = (props: Props) => {
context.globalAlpha = upLineAlpha;
context.lineWidth = upLineWidth;
context.strokeStyle = upLineColor;
lineStyle ? drawLine(listUp) : drawBezier(listUp);
lineStyle ? drawBezier(listUp) : drawLine(listUp);
context.stroke();
context.closePath();
@ -185,7 +175,7 @@ const TrafficGraph = (props: Props) => {
context.globalAlpha = downLineAlpha;
context.lineWidth = downLineWidth;
context.strokeStyle = downLineColor;
lineStyle ? drawLine(listDown) : drawBezier(listDown);
lineStyle ? drawBezier(listDown) : drawLine(listDown);
context.stroke();
context.closePath();