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效果示例

功能描述

在微信小程序中，实现一个简单的拼图小游戏。用户需要将四张碎片图片拖动到目标图片的正确位置，具体功能如下：

拖动功能：
用户可以通过手指拖动碎片图片，自由移动到目标图片的任意位置。

位置匹配：

如果碎片被拖动到正确的位置（即与目标图片的预定区域完全重叠或匹配），碎片会自动吸附到目标图片的指定位置，并显示为已完成。
如果碎片被拖动到错误的位置（未能与目标区域匹配），碎片会自动返回到初始位置。

完成检测：
当所有碎片都被正确放置后，触发完成拼图的效果（如显示完整图片、播放动画或提示成功信息）。

代码示例

• html

<!--pages/cssCase/puzzle1/index.wxml-->
<view class="container"><!-- 上方的拼图框 --><view class="puzzle-box"><view class="puzzle-cell" wx:for="{{puzzleCells}}" wx:key="id" id="{{item.id}}" data-id="{{item.id}}"><image src="{{item.image}}" class="target-image"></image></view></view><!-- 下方的碎片 --> <!-- 添加 data-index 以传递碎片的索引 --><view class="pieces"><view class="piece" wx:for="{{pieces}}" wx:key="id" id="{{item.id}}" style="left: {{item.left}}px; top: {{item.top}}px;" data-id="{{item.id}}" data-index="{{index}}"  bindtouchstart="onTouchStart" bindtouchmove="onTouchMove" bindtouchend="onTouchEnd"wx:if="{{!item.hidden}}"> <!-- 只有当 hidden 为 false 时才显示碎片 --><image src="{{item.image}}"></image></view></view>
</view>

• css

/* pages/cssCase/puzzle1/index.wxss */
.container {display: flex;flex-direction: column;align-items: center;justify-content: center;height: 100%;
}.puzzle-box {margin: 20rpx;border: 1px solid #ccc;display: flex;align-items: center;justify-content: center;flex-wrap: wrap;padding: 20rpx;box-sizing: border-box;
}.puzzle-cell {width: 300rpx;height: 300rpx;border: 1rpx solid #ccc;position: relative;
}
.target-image {width: 300rpx;height: 300rpx;
}.pieces {display: flex;justify-content: space-between;width: 100%;padding: 0 10rpx;
}.piece {width: 150rpx;height: 150rpx;position: absolute;
}.piece image {width: 100%;height: 100%;
}

• js

// pages/cssCase/puzzle1/index.js
Page({data: {puzzleCells: [{ id: 'cell-1', image: '', correctPieceId: 'piece-1' },{ id: 'cell-2', image: '', correctPieceId: 'piece-2' },{ id: 'cell-3', image: '', correctPieceId: 'piece-3' },{ id: 'cell-4', image: '', correctPieceId: 'piece-4' },],pieces: [{ id: 'piece-1', image: 'https://static.sprucesmart.com/activity/shandong/jigsawPuzzle20250109/ce1.jpeg', left: 10, top: 380, originalLeft: 10, originalTop: 380, hidden: false },{ id: 'piece-2', image: 'https://static.sprucesmart.com/activity/shandong/jigsawPuzzle20250109/ce2.jpeg', left: 120, top: 380, originalLeft: 120, originalTop: 380, hidden: false },{ id: 'piece-3', image: 'https://static.sprucesmart.com/activity/shandong/jigsawPuzzle20250109/ce3.jpeg', left: 210, top: 380, originalLeft: 210, originalTop: 380, hidden: false },{ id: 'piece-4', image: 'https://static.sprucesmart.com/activity/shandong/jigsawPuzzle20250109/ce4.jpeg', left: 300, top: 380, originalLeft: 300, originalTop: 380, hidden: false },],draggingPiece: null,draggingPieceIndex: null, // 用于记录当前拖拽的碎片在 pieces 中的索引},onTouchStart(e) {const { id, index } = e.currentTarget.dataset;this.setData({draggingPiece: id,draggingPieceIndex: index,});},onTouchMove(e) {const { pageX, pageY } = e.touches[0];const updatedPieces = this.data.pieces.map((piece, index) => {if (index === this.data.draggingPieceIndex) {return { ...piece, left: pageX - 75, top: pageY - 75 }; // 让碎片跟随手指移动}return piece;});this.setData({ pieces: updatedPieces });},onTouchEnd(e) {const { draggingPiece, draggingPieceIndex } = this.data;if (!draggingPiece) return;const query = wx.createSelectorQuery();this.data.puzzleCells.forEach((cell) => {query.select(`#${cell.id}`).boundingClientRect();});query.select(`#${draggingPiece}`).boundingClientRect();query.exec((res) => {const cellRects = res.slice(0, this.data.puzzleCells.length);const pieceRect = res[res.length - 1];let placed = false;cellRects.forEach((cellRect, index) => {const cell = this.data.puzzleCells[index];if (cell.correctPieceId === draggingPiece && this.checkOverlap(cellRect, pieceRect)) {placed = true;this.updatePuzzleCellImage(index, this.data.pieces[draggingPieceIndex].image);this.hidePiece(draggingPieceIndex);this.updatePiecePosition(draggingPieceIndex, cellRect.left, cellRect.top);}});if (!placed) {this.resetPiecePosition(draggingPieceIndex);}this.setData({ draggingPiece: null });// 检查是否完成拼图this.checkCompletion();});},checkOverlap(box1, box2) {return (box1.left < box2.left + box2.width &&box1.left + box1.width > box2.left &&box1.top < box2.top + box2.height &&box1.top + box1.height > box2.top);},updatePuzzleCellImage(cellIndex, image) {const updatedCells = [...this.data.puzzleCells];updatedCells[cellIndex].image = image;this.setData({ puzzleCells: updatedCells });},hidePiece(pieceIndex) {const updatedPieces = this.data.pieces.map((piece, index) => {if (index === pieceIndex) {return { ...piece, hidden: true }; // 设置碎片为隐藏}return piece;});this.setData({ pieces: updatedPieces });},updatePiecePosition(pieceIndex, left, top) {const updatedPieces = this.data.pieces.map((piece, index) => {if (index === pieceIndex) {return { ...piece, left, top };}return piece;});this.setData({ pieces: updatedPieces });},resetPiecePosition(pieceIndex) {const updatedPieces = this.data.pieces.map((piece, index) => {if (index === pieceIndex) {return { ...piece, left: piece.originalLeft, top: piece.originalTop };}return piece;});this.setData({ pieces: updatedPieces });},// 检查拼图是否完成checkCompletion() {const allPiecesPlaced = this.data.pieces.every((piece) => piece.hidden);if (allPiecesPlaced) {wx.showToast({title: '拼图完成！',icon: 'success',duration: 2000,});}},
});