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Android RadarView雷達(dá)圖（蜘蛛網(wǎng)圖）的實(shí)現(xiàn)代碼

 更新時(shí)間：2018年03月27日 10:56:56   作者：程序猿tx  
這篇文章主要介紹了Android RadarView雷達(dá)圖（蜘蛛網(wǎng)圖）的實(shí)現(xiàn)代碼，小編覺(jué)得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過(guò)來(lái)看看吧

公司產(chǎn)品需要一個(gè)雷達(dá)圖來(lái)展示各維度的比重，網(wǎng)上找了一波，學(xué)到不少，直接自己上手來(lái)擼一記

無(wú)圖言虛空

簡(jiǎn)單分析一波，確定雷達(dá)圖正幾邊形的--正五邊形 int count=5，分為幾個(gè)層數(shù)--4 層 int layerCount=4

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  drawPolygon(canvas);//畫(huà)邊
  drawLines(canvas);//畫(huà)線
  drawText(canvas);//描繪文字
  drawRegion(canvas);//覆蓋區(qū)域
 }

主要這幾步，開(kāi)擼！

自定義RadarView繼承View

確定需要使用的變量，初始化paint，計(jì)算圓心角

 private int count = 5; //幾邊形
 private int layerCount = 4; //層數(shù)
 private float angle; //每條邊對(duì)應(yīng)的圓心角
 private int centerX; //圓心x
 private int centerY; //圓心y
 private float radius; //半徑
 private Paint polygonPaint; //邊框paint
 private Paint linePaint; //連線paint
 private Paint txtPaint; //文字paint
 private Paint circlePaint; //圓點(diǎn)paint
 private Paint regionColorPaint; //覆蓋區(qū)域paint
 private Double[] percents = {0.91, 0.35, 0.12, 0.8, 0.5}; //覆蓋區(qū)域百分比
 private String[] titles = {"dota", "斗地主", "大吉大利，晚上吃雞", "爐石傳說(shuō)", "跳一跳"};//文字
public RadarView(Context context) {
  this(context, null, 0);
 }

 public RadarView(Context context, @Nullable AttributeSet attrs) {
  this(context, attrs, 0);
 }

 public RadarView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  //計(jì)算圓心角
  angle = (float) (Math.PI * 2 / count);

  polygonPaint = new Paint();
  polygonPaint.setColor(ContextCompat.getColor(context, R.color.radarPolygonColor));
  polygonPaint.setAntiAlias(true);
  polygonPaint.setStyle(Paint.Style.STROKE);
  polygonPaint.setStrokeWidth(4f);

  linePaint = new Paint();
  linePaint.setColor(ContextCompat.getColor(context, R.color.radarLineColor));
  linePaint.setAntiAlias(true);
  linePaint.setStyle(Paint.Style.STROKE);
  linePaint.setStrokeWidth(2f);

  txtPaint = new Paint();
  txtPaint.setColor(ContextCompat.getColor(context, R.color.radarTxtColor));
  txtPaint.setAntiAlias(true);
  txtPaint.setStyle(Paint.Style.STROKE);
  txtPaint.setTextSize(DensityUtil.dpToPx(context, 12));

  circlePaint = new Paint();
  circlePaint.setColor(ContextCompat.getColor(context, R.color.radarCircleColor));
  circlePaint.setAntiAlias(true);

  regionColorPaint = new Paint();
  regionColorPaint.setColor(ContextCompat.getColor(context, R.color.radarRegionColor));
  regionColorPaint.setStyle(Paint.Style.FILL);
  regionColorPaint.setAntiAlias(true);

 }

確定中心點(diǎn)

需要正五邊形得有一個(gè)圓，圓內(nèi)接正五邊形，在onSizeChanged方法里獲取圓心，確定半徑

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  radius = Math.min(h, w) / 2 * 0.7f;
  centerX = w / 2;
  centerY = h / 2;
 }

繪制正五邊形

繪制正五邊形同時(shí)描繪最外圍的點(diǎn)，確定分為4層，半徑 / 層數(shù) =每層之間的間距，從最里層開(kāi)始畫(huà)正五邊形，每層第一個(gè)點(diǎn)位于中心點(diǎn)正上方

private void drawPolygon(Canvas canvas) {
  Path path = new Path();
  float r = radius / layerCount;
  for (int i = 1; i <= layerCount; i++) {
   float curR = r * i; //當(dāng)前所在層的半徑
   for (int j = 0; j < count; j++) {
    if (j == 0) {
     //每一層第一個(gè)點(diǎn)坐標(biāo)
     path.moveTo(centerX, centerY - curR); 
    } else {
     //順時(shí)針記錄其余頂角的點(diǎn)坐標(biāo)
     float x = (float) (centerX + Math.sin(angle * j) * curR);
     float y = (float) (centerY - Math.cos(angle * j) * curR);
     path.lineTo(x, y);
    }
   }
   //最外層的頂角外面的五個(gè)小圓點(diǎn)(圖中紅色部分)
   if (i == layerCount) {
    for (int j = 0; j < count; j++) {
     float x = (float) (centerX + Math.sin(angle * j) * (curR + 12));
     float y = (float) (centerY - Math.cos(angle * j) * (curR + 12));
     canvas.drawCircle(x, y, 4, circlePaint);
    }
   }
   path.close();
   canvas.drawPath(path, polygonPaint);
  }
 }

 

繪制連線

繪制最內(nèi)層頂角到最外層頂角的連線

 private void drawLines(Canvas canvas) {
  float r = radius / layerCount;
  for (int i = 0; i < count; i++) {
   //起始坐標(biāo) 從中心開(kāi)始的話(huà) startx=centerX , startY=centerY
   float startX = (float) (centerX + Math.sin(angle * i) * r);
   float startY = (float) (centerY - Math.cos(angle * i) * r);
   //末端坐標(biāo)
   float endX = (float) (centerX + Math.sin(angle * i) * radius);
   float endY = (float) (centerY - Math.cos(angle * i) * radius);
   canvas.drawLine(startX, startY, endX, endY, linePaint);
  }
 }

至此簡(jiǎn)易雷達(dá)圖成型，可以修改正幾邊形，多少層數(shù)（后續(xù)繼續(xù)添加文字）

 //設(shè)置幾邊形，**注意：設(shè)置幾邊形需要重新計(jì)算圓心角**
 public void setCount(int count){
  this.count = count;
  angle = (float) (Math.PI * 2 / count);
  invalidate();
 }

 //設(shè)置層數(shù)
 public void setLayerCount(int layerCount){
  this.layerCount = layerCount;
  invalidate();
 }

設(shè)置正六邊形、六層

 radarView.setCount(6);
 radarView.setLayerCount(6);

對(duì)于以下圖形的，可以設(shè)置第一個(gè)點(diǎn)坐標(biāo)位于中心點(diǎn)正右側(cè) (centerX+curR,centerY) ，順時(shí)針計(jì)算其余頂點(diǎn)坐標(biāo) x = (float) (centerX+curR*Math.cos(angle*j)), y = (float) (centerY+curR*Math.sin(angle*j)) ，同理連線等其余坐標(biāo)相應(yīng)改變...

 

描繪文字

由于各產(chǎn)品維度內(nèi)容不同，所需雷達(dá)圖樣式不一，這里只是描繪下不同位置的文字處理情況，具體需求還得按產(chǎn)品來(lái)，因產(chǎn)品而異

private void drawText(Canvas canvas) {
  for (int i = 0; i < count; i++) {
   //獲取到雷達(dá)圖最外邊的坐標(biāo)
   float x = (float) (centerX + Math.sin(angle * i) * (radius + 12));
   float y = (float) (centerY - Math.cos(angle * i) * (radius + 12));
   if (angle * i == 0) {
    //第一個(gè)文字位于頂角正上方
    txtPaint.setTextAlign(Paint.Align.CENTER);
    canvas.drawText(titles[i], x, y - 18, txtPaint);
    txtPaint.setTextAlign(Paint.Align.LEFT);
   } else if (angle * i > 0 && angle * i < Math.PI / 2) {
    //微調(diào)
    canvas.drawText(titles[i], x + 18, y + 10, txtPaint);
   } else if (angle * i >= Math.PI / 2 && angle * i < Math.PI) {
    //最右下的文字獲取到文字的長(zhǎng)、寬，按文字長(zhǎng)度百分比向左移
    String txt = titles[i];
    Rect bounds = new Rect();
    txtPaint.getTextBounds(txt, 0, txt.length(), bounds);
    float height = bounds.bottom - bounds.top;
    float width = txtPaint.measureText(txt);
    canvas.drawText(txt, x - width * 0.4f, y + height + 18, txtPaint);
   } else if (angle * i >= Math.PI && angle * i < 3 * Math.PI / 2) {
    //同理最左下的文字獲取到文字的長(zhǎng)、寬，按文字長(zhǎng)度百分比向左移
    String txt = titles[i];
    Rect bounds = new Rect();
    txtPaint.getTextBounds(txt, 0, txt.length(), bounds);
    float width = txtPaint.measureText(txt);
    float height = bounds.bottom - bounds.top;
    canvas.drawText(txt, x - width * 0.6f, y + height + 18, txtPaint);
   } else if (angle * i >= 3 * Math.PI / 2 && angle * i < 2 * Math.PI) {
    //文字向左移動(dòng)
    String txt = titles[i];
    float width = txtPaint.measureText(txt);
    canvas.drawText(txt, x - width - 18, y + 10, txtPaint);
   }

  }
 }

 

繪制覆蓋區(qū)域

繪制覆蓋區(qū)域，百分比取連線長(zhǎng)度的百分比(如果從中心點(diǎn)開(kāi)始的連線，則是半徑的百分比)，此處用半徑radius減去間隔r即連線長(zhǎng)度

 private void drawRegion(Canvas canvas) {
  Path path = new Path();
  float r = radius / layerCount;//每層的間距
  for (int i = 0; i < count; i++) {
   if (i == 0) {
    path.moveTo(centerX, (float) (centerY - r - (radius - r) * percents[i]));
   } else {
    float x = (float) (centerX + Math.sin(angle * i) * (percents[i] * (radius - r) + r));
    float y = (float) (centerY - Math.cos(angle * i) * (percents[i] * (radius - r) + r));
    path.lineTo(x, y);
   }
  }
  path.close();
  canvas.drawPath(path, regionColorPaint);
 }

至此，一個(gè)簡(jiǎn)單的雷達(dá)圖完畢。以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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