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canvas代码优化

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This commit is contained in:
kron
2026-01-08 10:30:41 +08:00
parent c9a7c1ae8b
commit 4aa14c6a4c
12 changed files with 490 additions and 613 deletions
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464
src/canvas.js
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@@ -1,4 +1,15 @@
import { loadImage } from "@/util";
const loadImage = (src) =>
new Promise((resolve, reject) => {
try {
uni.getImageInfo({
src,
success: (res) => resolve(res.path || res.tempFilePath || src),
fail: (e) => reject(e),
});
} catch (e) {
reject(src);
}
});
function drawLine(ctx, x1, y1, x2, y2, color = "#000", width = 1) {
ctx.beginPath();
@@ -482,7 +493,7 @@ async function loadCanvasImage(canvas, src) {
});
}
export const sharePractiseData = async (canvasId, data) => {
export const sharePointData = async (canvasId, data) => {
try {
const width = 375;
const height = 460;
@@ -550,3 +561,452 @@ export const sharePractiseData = async (canvasId, data) => {
console.error("generateShareImage 绘制失败:", e);
}
};
export function renderRankTitle(ctx, text) {
const fontSize = 8;
const textWidth = ctx.measureText(text).width;
const padding = 8; // 文字与背景边缘的间距
const radius = 8; // 圆角半径
const textX = 76;
const textY = 50;
const x = textX - padding - 10; // 文字 x 坐标减去内边距
const y = textY - fontSize - padding / 2 + 2; // 文字 y 坐标减去字体大小和内边距
const width = textWidth + padding * 2 - 25; // 背景宽度
const height = fontSize + padding - 2; // 背景高度
// 开始绘制圆角矩形
ctx.beginPath();
// 从左上角开始，顺时针绘制
ctx.moveTo(x + radius, y);
// 上边框
ctx.lineTo(x + width - radius, y);
ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
// 右边框
ctx.lineTo(x + width, y + height - radius);
ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
// 下边框
ctx.lineTo(x + radius, y + height);
ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
// 左边框
ctx.lineTo(x, y + radius);
ctx.quadraticCurveTo(x, y, x + radius, y);
// 设置背景颜色并填充
if (typeof ctx.setFillStyle === "function") {
ctx.setFillStyle("#5F51FF");
} else {
ctx.fillStyle = "#5F51FF";
}
ctx.fill();
if (typeof ctx.setFontSize === "function") {
ctx.setFontSize(fontSize);
ctx.setTextAlign("center");
ctx.setFillStyle("rgba(255, 255, 255, 0.9)");
} else {
ctx.font = `${fontSize}px sans-serif`;
ctx.textAlign = "center";
ctx.fillStyle = "rgba(255, 255, 255, 0.9)";
}
ctx.fillText(text, textX, textY); // 绘制文字
}
export function renderScores(ctx, arrows = [], bgImg) {
let rowIndex = 0;
arrows.forEach((item, i) => {
rowIndex = i;
if (arrows.length >= 36 && i < 36) {
if (bgImg) {
ctx.drawImage(
bgImg,
16 + (i % 9) * 30,
290 + Math.ceil((i + 1) / 9) * 30,
27,
27
);
} else {
ctx.drawImage(
"../static/score-bg.png",
16 + (i % 9) * 30,
290 + Math.ceil((i + 1) / 9) * 30,
27,
27
);
}
renderText(
ctx,
item.ring,
18,
"#fed847",
29.5 + (i % 9) * 30,
310 + Math.ceil((i + 1) / 9) * 30,
"center"
);
} else if (arrows.length >= 12 && i < 12) {
if (i > 5) rowIndex = i - 6;
if (bgImg) {
ctx.drawImage(bgImg, 24 + rowIndex * 42, i > 5 ? 362 : 320, 38, 38);
} else {
ctx.drawImage(
"../static/score-bg.png",
24 + rowIndex * 42,
i > 5 ? 362 : 320,
38,
38
);
}
renderText(
ctx,
item.ring,
23,
"#fed847",
43 + rowIndex * 42,
i > 5 ? 389 : 347,
"center"
);
}
});
}
export function renderLine(ctx, from) {
ctx.beginPath();
if (typeof ctx.setLineWidth === "function") {
ctx.setLineWidth(1);
ctx.setStrokeStyle("rgba(255, 255, 255, 0.3)");
} else {
ctx.lineWidth = 1;
ctx.strokeStyle = "rgba(255, 255, 255, 0.3)";
}
const length = 35;
ctx.moveTo(from, 295);
ctx.lineTo(from + length, 295);
ctx.stroke();
}
export async function sharePractiseData(canvasId, type, user, data) {
try {
const width = 300;
const height = 530;
const { canvas, ctx } = await getCanvas2DContext(canvasId, width, height);
// 预加载所有图片
const bgImgSrc = await loadImage(
"https://static.shelingxingqiu.com/attachment/2026-01-07/dfia8qlexbwoqaezyd.png"
);
const bgImg = await loadCanvasImage(canvas, bgImgSrc);
const avatarImgPromise = loadImage(user.avatar).then((path) =>
loadCanvasImage(canvas, path)
);
const lvlImgPromise = loadImage(user.lvlImage).then((path) =>
loadCanvasImage(canvas, path)
);
let titleImageSrc = "../static/first-try-title.png";
if (type == 2) {
titleImageSrc = "../static/practise-one-title.png";
} else if (type == 3) {
titleImageSrc = "../static/practise-two-title.png";
}
const titleImgPromise = loadCanvasImage(canvas, titleImageSrc);
const scoreBgImgPromise = loadCanvasImage(canvas, "../static/score-bg.png");
const qrCodeImgPromise = loadCanvasImage(canvas, "../static/qr-code.png");
const [avatarImg, lvlImg, titleImg, scoreBgImg, qrCodeImg] =
await Promise.all([
avatarImgPromise,
lvlImgPromise,
titleImgPromise,
scoreBgImgPromise,
qrCodeImgPromise,
]);
// 先填充整体背景色
ctx.fillStyle = "#F5F5F5";
ctx.fillRect(0, 0, width, height);
ctx.drawImage(bgImg, 0, 0, width, height);
drawRoundImage(ctx, avatarImg, 17, 20, 32, 32, 20);
ctx.drawImage(lvlImg, 12, 15, 42, 42);
renderText(ctx, user.nickName, 13, "#fff", 58, 34);
renderRankTitle(ctx, user.lvlName);
let subTitle = "正式开启弓箭手之路";
if (type > 1) {
subTitle = `今日弓箭练习打卡 ${data.createdAt
.split(" ")[0]
.replaceAll("-", ".")}`;
}
ctx.drawImage(titleImg, (width - 160) / 2, 160, 160, 40);
ctx.font = "18px sans-serif";
renderText(ctx, subTitle, 18, "#fff", width / 2, 224, "center");
renderText(ctx, "共", 14, "#fff", 122, 300);
const totalRing = data.arrows.reduce((last, next) => last + next.ring, 0);
renderText(ctx, totalRing, 14, "#fed847", 148, 300, "center");
renderText(ctx, "环", 14, "#fff", 161, 300);
renderLine(ctx, 77);
renderLine(ctx, 185);
renderScores(ctx, data.arrows, scoreBgImg);
ctx.drawImage(qrCodeImg, width * 0.06, height * 0.87, 52, 52);
renderText(ctx, "射灵平台", 12, "#fff", width * 0.26, height * 0.9);
renderText(
ctx,
"快加入我们一起玩吧~",
9,
"rgba(255, 255, 255, 0.5)",
width * 0.26,
height * 0.93
);
renderText(
ctx,
"后羿就是这样练成的",
9,
"rgba(255, 255, 255, 0.5)",
width * 0.26,
height * 0.955
);
// 2D 模式下无需 ctx.draw()
} catch (err) {
console.log(err);
}
}
export const generateShareCard = (canvasId, date, actual, total) => {
try {
const ctx = uni.createCanvasContext(canvasId);
const imgUrl =
"https://static.shelingxingqiu.com/attachment/2025-11-04/ddzpm4tyh5vunyacsr.png";
const drawWidth = 375;
const drawHeight = 300;
// 先填充整体背景色
if (typeof ctx.setFillStyle === "function") {
ctx.setFillStyle("#F5F5F5");
} else {
ctx.fillStyle = "#F5F5F5";
}
if (typeof ctx.fillRect === "function") {
ctx.fillRect(0, 0, drawWidth, drawHeight);
}
// 兼容第三个参数传入 "actual/total" 的情况
let a = actual;
let t = total;
if (
(t === undefined || t === null) &&
typeof a === "string" &&
a.includes("/")
) {
const parts = a.split("/");
a = parts[0];
t = parts[1] || "";
}
return new Promise((resolve, reject) => {
uni.getImageInfo({
src: imgUrl,
success: (res) => {
const path = res.path || res.tempFilePath || imgUrl;
if (typeof ctx.clearRect === "function") {
ctx.clearRect(0, 0, drawWidth, drawHeight);
}
ctx.drawImage(path, 0, 0, drawWidth, drawHeight);
// 绘制左上角日期（白色，22px）
renderText(ctx, String(date || ""), 18, "#FFFFFF", 6, 20, "left");
// 居中绘制第三个参数为圆角黑底标签
const rectW = 200;
const rectH = 78;
const radius = 39;
const rectX = (drawWidth - rectW) / 2;
const rectY = (drawHeight - rectH) / 2 - 12;
ctx.save();
ctx.beginPath();
ctx.moveTo(rectX + radius, rectY);
ctx.lineTo(rectX + rectW - radius, rectY);
ctx.quadraticCurveTo(
rectX + rectW,
rectY,
rectX + rectW,
rectY + radius
);
ctx.lineTo(rectX + rectW, rectY + rectH - radius);
ctx.quadraticCurveTo(
rectX + rectW,
rectY + rectH,
rectX + rectW - radius,
rectY + rectH
);
ctx.lineTo(rectX + radius, rectY + rectH);
ctx.quadraticCurveTo(
rectX,
rectY + rectH,
rectX,
rectY + rectH - radius
);
ctx.lineTo(rectX, rectY + radius);
ctx.quadraticCurveTo(rectX, rectY, rectX + radius, rectY);
ctx.closePath();
ctx.setFillStyle("rgba(0,0,0,0.5)");
ctx.fill();
ctx.restore();
// 居中排版：左侧显示 actual/，右侧显示 total，再追加“环”
ctx.save();
if (typeof ctx.setTextBaseline === "function")
ctx.setTextBaseline("middle");
const centerX = rectX + rectW / 2;
const centerY = rectY + rectH / 2;
// 左半部：右对齐 actual/
renderText(ctx, `${a}/`, 40, "#FFFFFF", centerX, centerY, "right");
// 右半部：左对齐 total
renderText(
ctx,
`${t || ""}`,
30,
"#FFFFFF",
centerX,
centerY,
"left"
);
// 追加单位“环”：放在 total 文本之后 16px
const totalWidth = ctx.measureText(`${t || ""}`).width || 0;
renderText(
ctx,
"环",
20,
"#FFFFFF",
centerX + totalWidth + 5,
centerY,
"left"
);
ctx.restore();
ctx.draw(false, () => {
try {
uni.canvasToTempFilePath({
canvasId,
width: drawWidth,
height: drawHeight,
destWidth: drawWidth,
destHeight: drawHeight,
fileType: "png",
quality: 1,
success: (r) => {
const path = r.tempFilePath || r.apFilePath || r.filePath;
resolve(path);
},
fail: (err) => reject(err),
});
} catch (err) {
reject(err);
}
});
},
fail: () => {
try {
ctx.drawImage(imgUrl, 0, 0, drawWidth, drawHeight);
// 绘制左上角日期（白色，22px）
renderText(ctx, String(date || ""), 22, "#FFFFFF", 10, 22, "left");
// 居中绘制第三个参数为圆角黑底标签
const rectW = 200;
const rectH = 78;
const radius = 39;
const rectX = (drawWidth - rectW) / 2;
const rectY = (drawHeight - rectH) / 2;
ctx.save();
ctx.beginPath();
ctx.moveTo(rectX + radius, rectY);
ctx.lineTo(rectX + rectW - radius, rectY);
ctx.quadraticCurveTo(
rectX + rectW,
rectY,
rectX + rectW,
rectY + radius
);
ctx.lineTo(rectX + rectW, rectY + rectH - radius);
ctx.quadraticCurveTo(
rectX + rectW,
rectY + rectH,
rectX + rectW - radius,
rectY + rectH
);
ctx.lineTo(rectX + radius, rectY + rectH);
ctx.quadraticCurveTo(
rectX,
rectY + rectH,
rectX,
rectY + rectH - radius
);
ctx.lineTo(rectX, rectY + radius);
ctx.quadraticCurveTo(rectX, rectY, rectX + radius, rectY);
ctx.closePath();
ctx.setFillStyle("rgba(0,0,0,0.5)");
ctx.fill();
ctx.restore();
// 居中排版：左侧显示 actual/，右侧显示 total，再追加“环”
ctx.save();
if (typeof ctx.setTextBaseline === "function")
ctx.setTextBaseline("middle");
const centerX = rectX + rectW / 2;
const centerY = rectY + rectH / 2;
// 左半部：右对齐 actual/
renderText(ctx, `${a}/`, 40, "#FFFFFF", centerX, centerY, "right");
// 右半部：左对齐 total
renderText(
ctx,
`${t || ""}`,
35,
"#FFFFFF",
centerX,
centerY,
"left"
);
// 追加单位“环”：放在 total 文本之后 16px
const totalWidth = ctx.measureText(`${t || ""}`).width || 0;
renderText(
ctx,
"环",
20,
"#FFFFFF",
centerX + totalWidth + 5,
centerY,
"left"
);
ctx.restore();
ctx.draw(false, () => {
try {
uni.canvasToTempFilePath({
canvasId,
width: drawWidth,
height: drawHeight,
destWidth: drawWidth,
destHeight: drawHeight,
fileType: "png",
quality: 1,
success: (r) => {
const path = r.tempFilePath || r.apFilePath || r.filePath;
resolve(path);
},
fail: (err) => reject(err),
});
} catch (err) {
reject(err);
}
});
} catch (e) {
reject(e);
}
},
});
});
} catch (e) {
console.error("generateShareCardImage 绘制失败:", e);
}
};