微信小程序项目实例——我有一支画笔（画画）
文章目录
项目代码见文字底部，点赞关注有惊喜
一、项目展示
我有一支画笔是一款绘图小程序
用户可以在白板上自由画画，也可以选择一张本地的照片，在照片上画画
用户可以自由修改画笔宽度、颜色，同时绘画可以保存到本地
二、首页
首页由两张图片构成
代表自由绘图和照片绘图两个功能
用户点击选择不同功能
<!--index.wxml--> <view class="painting" bindtap="toPainting"> <image src="../../images/paint3.png" mode="aspectFit"/> </view> <view class="painting2" bindtap="toPainting2"> <image src="../../images/paint2.png" mode="aspectFit"/> </view>
/**index.wxss**/ page{ width: 100%; height: auto; display: flex; flex-direction: column; align-items: center; } .painting{ display: flex; flex-direction: column; align-items: center; justify-content: center; margin-top: 100px; width: 260rpx; height: 260rpx; /* background-color: red; */ } .painting2{ display: flex; flex-direction: column; align-items: center; justify-content: center; margin-top: 100px; width: 260rpx; height: 260rpx; /* background-color: red; */ }
首页效果如下：
三、自由绘图
用户可以在空白页面上进行绘图
用户可以调整画笔粗细，画笔颜色
也可以使用橡皮擦来擦除
最后可以将画好的图保存到本地
下面仅展示UI界面代码
<!--painting.wxml--> <canvas canvas-id="myCanvas" style="height: calc(100vh - {{canvasHeight}}px)" disable-scroll="true" bindtouchend="toucheEnd" bindtouchstart="touchStart" bindtouchmove="touchMove"/> <view class="bottom"> <block wx:for="{{btnInfo}}" wx:key="{{index}}"> <view class="list-item" data-type="{{item.type}}" style="background: {{item.background}}" bindtap="tapBtn"></view> </block> </view> <view class="choose-box" wx:if="{{width}}"> <view class="color-box" style="background: {{'rgb(' + r + ', ' + g + ', ' + b + ')'}}; height: {{w}}px; border-radius: {{w/2}}px"></view> <slider min="1" max="50" step="1" show-value="true" value="{{w}}" bindchange="changeWidth"/> </view> <view class="choose-box" wx:if="{{color}}"> <view class="color-box" style="background: {{'rgb(' + r + ', ' + g + ', ' + b + ')'}}; height: {{w}}px; border-radius: {{w/2}}px"></view> <slider min="0" max="255" step="1" show-value="true" activeColor="red" value="{{r}}" data-color="r" bindchange="changeColor"/> <slider min="0" max="255" step="1" show-value="true" activeColor="green" value="{{g}}" data-color="g" bindchange="changeColor"/> <slider min="0" max="255" step="1" show-value="true" activeColor="blue" value="{{b}}" data-color="b" bindchange="changeColor"/> </view> <view class="choose-box-flex" wx:if="{{clear}}"> <view class="choose-item" bindtap="chooseEraser"> <view class="choose-img" style='background: url("https://s1.ax1x.com/2022/05/25/XkppBF.png") white no-repeat; background-size: 26px 26px;background-position: 2px 2px; border: {{eraser ? "2px solid red" : "2px solid transparent"}}'></view> <view>橡皮擦</view> </view> <view class="choose-item" bindtap="clearCanvas"> <view class="choose-img" style='background: url("https://s1.ax1x.com/2022/05/25/XkpDCn.png") white no-repeat; background-size: 26px 26px;background-position: 2px 2px;'></view> <view>清空</view> </view> </view>
/* painting.wxss */ page { background: rgba(153, 204, 255, 0.1); } canvas { width: 100vw; } .bottom { width: 100vw; height: 50px; position: absolute; bottom: 0; display: flex; justify-content: space-around; } .list-item { width: 30px; height: 30px; margin: 10px 0; border-radius: 50%; } .choose-box { width: 100vw; position: absolute; bottom: 50px; } .color-box { width: 50vw; margin: 20px auto; } slider { margin: 20px 30px; } .choose-box-flex { display: flex; justify-content: space-around; width: 100vw; position: absolute; bottom: 50px; font-size: 16px; color: #666; text-align: center; } .choose-img { width: 30px; height: 30px; margin: 10px; border-radius: 50%; background: white; }
下面我将给大家演示一下我的室友！！！
（喜欢我室友的可以私信我，送微信号！！！）
四、照片绘图
用户可以选择一张照片
在照片的基础上进行绘画
其余功能和自由绘画一致
下面仅展示UI界面代码
<!--painting-2.wxml--> <canvas canvas-id="myCanvas" disable-scroll="true" bindtouchstart="touchStart" bindtouchmove="touchMove" bindtouchend="touchEnd" wx:if="{{hasChoosedImg}}" style="height: {{(canvasHeightLen == 0) ? canvasHeight : canvasHeightLen}}px; width: {{canvasWidth}}px;" /> <view class="failText" wx:if="{{!hasChoosedImg}}" click="">没有选择照片，点击重新选择</view> <view class="bottom"> <block wx:for="{{btnInfo}}" wx:key="{{index}}"> <view class="list-item" data-type="{{item.type}}" style="background: {{item.background}}" bindtap="tapBtn"></view> </block> </view> <view class="choose-box" wx:if="{{width}}"> <view class="color-box" style="background: {{'rgb(' + r + ', ' + g + ', ' + b + ')'}}; height: {{w}}px; border-radius: {{w/2}}px"></view> <slider min="1" max="50" step="1" show-value="true" value="{{w}}" bindchange="changeWidth"/> </view> <view class="choose-box" wx:if="{{color}}"> <view class="color-box" style="background: {{'rgb(' + r + ', ' + g + ', ' + b + ')'}}; height: {{w}}px; border-radius: {{w/2}}px"></view> <slider min="0" max="255" step="1" show-value="true" activeColor="red" value="{{r}}" data-color="r" bindchange="changeColor"/> <slider min="0" max="255" step="1" show-value="true" activeColor="green" value="{{g}}" data-color="g" bindchange="changeColor"/> <slider min="0" max="255" step="1" show-value="true" activeColor="blue" value="{{b}}" data-color="b" bindchange="changeColor"/> </view>
/* painting-2.wxss */ page { background: rgba(153, 204, 255, 0.1); } .failText { margin-top: 100px; text-align: center; color: #888; } .bottom { width: 100vw; height: 50px; position: absolute; bottom: 0; display: flex; justify-content: space-around; } .list-item { width: 30px; height: 30px; margin: 10px 0; border-radius: 50%; } .choose-box { width: 100vw; position: absolute; bottom: 50px; } .color-box { width: 50vw; margin: 20px auto; } slider { margin: 20px 30px; } .choose-box-flex { display: flex; justify-content: space-around; width: 100vw; position: absolute; bottom: 50px; font-size: 16px; color: #666; text-align: center; } .choose-img { width: 30px; height: 30px; margin: 10px; border-radius: 50%; background: white; }
下面我将画我的室友2号！！
我的室友2号是校草！！！
中意的请私信我发他微信号！
文末
具体的介绍就到这里了
小程序有时候会卡顿一下但是不多
有兴趣的同学可以继续研究
代码放到下面链接里了
