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社区首页 >专栏 >自定义绘制柱形图

自定义绘制柱形图

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xiangzhihong
发布2018-02-01 10:22:55
8100
发布2018-02-01 10:22:55
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文章被收录于专栏:向治洪
这里写图片描述
这里写图片描述

设计思路:

1.画柱状图  2.画竖线  3.画顶部横线  4.画文字

1.画柱状图

画柱状图的方法很简单,就是使用canvas.drawRect(float left, float top, float right, float bottom, Paint paint),其实这里我遇到了一个问题,一开始我想只画一条柱状图,然后需要几个柱状图就在xml文件中声明几个,后来我发现,这样实现起来的动画非常之卡顿(上面gif录出来看上去很卡,其实很流畅)。后来我就换了一种思路,就是声明一个数组,在Activity传入我们需要画的柱状图的总个数和每个柱状图的目标值大小,然后在onDraw方法里分别计算每个柱状图的当前进度,然后分别画出来,这样动画效果就非常流畅了。

代码语言:javascript
复制
<code class="language-java hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> <span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
         * 画柱状图
         */</span>
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span> ; i<totalBarNum ; i++){
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (currentBarProgress[i]<(respTarget.get(i)/max)*stopX) {
                currentBarProgress[i]+=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>;
                postInvalidateDelayed(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>);
            }
            canvas.drawText(respName.get(i),startX,startY+deltaY+i*(deltaY+barWidth)+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>*barWidth/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>, mTextPaint);
            canvas.drawRect(startX+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">7</span>*barWidth/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>, startY+deltaY+i*(deltaY+barWidth), currentBarProgress[i], startY+deltaY+i*(deltaY+barWidth)+barWidth, mBarPaint);
        }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

2.画竖线和文字

有了上面画柱状图的思路,画竖线就非常容易想了,和画柱状图是一个思路,也是Activity中传入需要画几条竖线,然后在onDraw方法里分别去计算他们的当前进度值,然后再分别去画

文字大小应该随着柱形图宽度来自动适应,所以我进行了一些计算,看上去很复杂,其实就是为了自适应文字的大小

代码语言:javascript
复制
<code class="language-java hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> <span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
         * 画竖线
         */</span>
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span> ; i<verticalLineNum ; i++){
            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (currentVerticalLineProgress< measuredHeight) {
                currentVerticalLineProgress+=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>;
                postInvalidateDelayed(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>);
            }
            canvas.drawLine((startX+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">7</span>*barWidth/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>)+(i+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)*deltaX, startY, (startX+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">7</span>*barWidth/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>)+(i+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)*deltaX, currentVerticalLineProgress, mLinePaint);
            <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//画文字</span>
            canvas.drawText(numPerUnit*(i+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)+unit, (startX+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">7</span>*barWidth/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>)+(i+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>)*deltaX-barWidth, startY-barWidth/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>, mTextPaint);
        }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>

3.画顶部横线

顶部横线我是从右向左画的,正好与柱状图形成一个对比

代码语言:javascript
复制
<code class="language-java hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> <span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
         * 画最上面的横线
         */</span>
        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (currentHorizentalLineProgress>startX+<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">7</span>*barWidth/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>) {
            currentHorizentalLineProgress-=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>;
            postInvalidateDelayed(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>);
        }
        canvas.drawLine(stopX, startY, currentHorizentalLineProgress, startY, mLinePaint);
    }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

使用方法

1.设置柱状图的最大值

代码语言:javascript
复制
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">mBarGraph<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setMax</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">40</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

2.设置柱状图单位

代码语言:javascript
复制
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">mBarGraph<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setUnit</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"亿元"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

3.设置柱状图宽度

代码语言:javascript
复制
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">mBarGraph<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setBarWidth</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">50</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

4.设置竖线条数

代码语言:javascript
复制
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">mBarGraph<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setVerticalLineNum</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

5.设置柱状图总个数

代码语言:javascript
复制
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> mBarGraph<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setTotalBarNum</span>(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">7</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

6.设置每个柱状图的目标值

代码语言:javascript
复制
<code class="hljs r has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"> private ArrayList<Float> respectTarget;
 <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span>
 respectTarget = new ArrayList<Float>();
 respectTarget.add(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">35.</span>0f);
        respectTarget.add(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">20.</span>0f);
        respectTarget.add(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">18.</span>0f);
        respectTarget.add(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15.</span>0f);
        respectTarget.add(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10.</span>0f);
        respectTarget.add(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8.</span>0f);
        respectTarget.add(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5.</span>0f);
  mBarGraph.setRespectTargetNum(respectTarget);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

7.设置每个柱状图的名字

代码语言:javascript
复制
<code class="hljs r has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">private ArrayList<String> respName;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">...</span>
respName = new ArrayList<String>();
 respName.add(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"滴滴"</span>);
        respName.add(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"小米"</span>);
        respName.add(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"京东"</span>);
        respName.add(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"美团"</span>);
        respName.add(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"魅族"</span>);
        respName.add(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"酷派"</span>);
        respName.add(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"携程"</span>);
mBarGraph.setRespectName(respName);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

完整代码

大家可以上我的GitHub上下载完整代码

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原始发表:2015-11-05 ,如有侵权请联系 cloudcommunity@tencent.com 删除

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目录
  • 设计思路:
    • 1.画柱状图
      • 2.画竖线和文字
        • 3.画顶部横线
          • 使用方法
            • 完整代码
            领券
            问题归档专栏文章快讯文章归档关键词归档开发者手册归档开发者手册 Section 归档