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手動(dòng)擼個(gè)Android雷達(dá)圖(蜘蛛網(wǎng)圖)RadarView

forsigner / 2961人閱讀

摘要:原文鏈接公司產(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,分為幾個(gè)層數(shù)層畫(huà)邊畫(huà)線描繪文字覆蓋區(qū)域主要這幾步,開(kāi)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(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)? ? 
privatefloatangle; //每條邊對(duì)應(yīng)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(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 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。
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