摘要:原文鏈接公司產品需要一個雷達圖來展示各維度的比重,網上找了一波,學到不少,直接自己上手來擼一記無圖言虛空簡單分析一波,確定雷達圖正幾邊形的正五邊形,分為幾個層數層畫邊畫線描繪文字覆蓋區域主要這幾步,開擼自定義繼承確定需要使用的變量,
原文鏈接 https://mp.weixin.qq.com/s/Ms...
公司產品需要一個雷達圖來展示各維度的比重,網上找了一波,學到不少,直接自己上手來擼一記
無圖言虛空
簡單分析一波,確定雷達圖正幾邊形的--正五邊形 int count=5,分為幾個層數--4 層 int layerCount=4
? ? @Override ? ? protected void onDraw(Canvas canvas) { ? ? ? ? super.onDraw(canvas); ? ? ? ? drawPolygon(canvas);//畫邊 ? ? ? ? drawLines(canvas);//畫線 ? ? ? ? drawText(canvas);//描繪文字 ? ? ? ? drawRegion(canvas);//覆蓋區域 ? ? }
主要這幾步,開擼!
自定義RadarView繼承View確定需要使用的變量,初始化paint,計算圓心角
private int count = 5; //幾邊形? ? private int layerCount = 4; //層數? ? privatefloatangle; //每條邊對應的圓心角? ? private int centerX; //圓心x? ? private int centerY; //圓心y? ? privatefloatradius; //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paint? ? private Paint regionColorPaint; //覆蓋區域paint? ? private Double[] percents = {0.91, 0.35, 0.12, 0.8, 0.5}; //覆蓋區域百分比? ? private String[] titles = {"dota","斗地主","大吉大利,晚上吃雞","爐石傳說","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
需要正五邊形得有一個圓,圓內接正五邊形,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;
? ? }
繪制正五邊形同時描繪最外圍的點,確定分為4層,半徑 / 層數 =每層之間的間距,從最里層開始畫正五邊形,每層第一個點位于中心點正上方
private void drawPolygon(Canvas canvas) { Path path = new Path(); float r = radius / layerCount; for (int i = 1; i <= layerCount; i++) { float curR = r * i; //當前所在層的半徑 for (int j = 0; j < count; j++) { if (j == 0) { //每一層第一個點坐標 path.moveTo(centerX, centerY - curR); } else { //順時針記錄其余頂角的點坐標 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小圓點(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 從中心開始的話 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 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); } }
至此簡易雷達圖成型,可以修改正幾邊形,多少層數(后續繼續添加文字)
//設置幾邊形,**注意:設置幾邊形需要重新計算圓心角** public void setCount(int count){ this.count = count; angle = (float) (Math.PI * 2 / count); invalidate(); } //設置層數 public void setLayerCount(int layerCount){ this.layerCount = layerCount; invalidate(); }
設置正六邊形、六層
? ? radarView.setCount(6);
? ? radarView.setLayerCount(6);
對于以下圖形的,可以設置第一個點坐標位于中心點正右側(centerX+curR,centerY),順時針計算其余頂點坐標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相應改變...
由于各產品維度內容不同,所需雷達圖樣式不一,這里只是描繪下不同位置的文字處理情況,具體需求還得按產品來,因產品而異
private void drawText(Canvas canvas) { for (int i = 0; i < count; i++) { //獲取到雷達圖最外邊的坐標 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 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、寬,按文字長度百分比向左移 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、寬,按文字長度百分比向左移 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 String txt = titles[i]; float width = txtPaint.measureText(txt); canvas.drawText(txt, x - width - 18, y + 10, txtPaint); } } }繪制覆蓋區域
繪制覆蓋區域,百分比取連線長度的百分比(如果從中心點開始的連線,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,一個簡單的雷達圖完畢。
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