Android仿芝麻信用分雷达分布图

首先看下支付宝上芝麻信用分的效果图：

今天来下面的效果

1. 绘制多边形以及线条

2. 绘制图标和文本

3. 绘制覆盖区域

4. 绘制覆盖分数

绘制多边形

参上上面的方法，可以计算出B的坐标，那么，绘制AB弦就变得很简单了吧！

绘制多边形以及线条

效果图如下：

绘制图标和文本

绘制覆盖区域

绘制覆盖分数

附上全部代码：

SesameCreditView.java

package com.jackie.sesamecredit.View;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;import com.jackie.sesamecredit.R;/*** Created by Administrator on 2016/11/18.*/public class SesameCreditView extends View {private Paint mPaint;/*** 圆心坐标*/private float mCenterX, mCenterY;/*** 圆心半径*/private float mRadius;/*** 绘制图标的大小*/private float mIconWidth;/*** 多边形的边数*/private static final int POLYGON_COUNT = 5;/*** 绘制文字的大小*/private static final int TEXT_SIZE = 25;/*** 角度*/private static final int DEGREE = 360 / POLYGON_COUNT;private static final int ICON_TITLE_MARGIN = 20;/*** 各维度分值*/private static final float[] SESAME_DATA = {170, 180, 160, 170, 180};/*** 数据最大值*/private static final float SESAME_MAX_VALUE = 190;private static final String[] SESAME_TITLE = { "身份特质", "履约能力", "信用历史", "人脉关系", "行为偏好" };private static final int[] SESAME_IDS = { R.mipmap.ic_identity, R.mipmap.ic_performance, R.mipmap.ic_history, R.mipmap.ic_contacts, R.mipmap.ic_predilection };public SesameCreditView(Context context) {this(context, null);}public SesameCreditView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public SesameCreditView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);initView();}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);int width = getMeasuredWidth();int height = getMeasuredHeight();mCenterX = width / 2;mCenterY = height / 2;mRadius = Math.min(mCenterX, mCenterY) * 2 / 3;mIconWidth = mRadius / 3;}private void initView() {mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setDither(true);mPaint.setStrokeWidth(3);mPaint.setColor(Color.WHITE);mPaint.setTextSize(TEXT_SIZE);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);drawPolygon(canvas);drawIcon(canvas);drawText(canvas);drawRegion(canvas);drawScore(canvas);}private void drawPolygon(Canvas canvas) {/*** 先绘制多边形的边*/for (int i = 0; i < POLYGON_COUNT; i++) {canvas.save();//圆心正上方的点作为参考点
//            float targetX = mRadius;float targetX = Math.min(mCenterX, mCenterY);float targetY = mCenterY - mRadius;float distance = (float) (2 * mRadius * Math.sin(Math.toRadians(DEGREE / 2)));float y = (distance * distance + mCenterY * mCenterY - targetY * targetY - mRadius * mRadius) / (2 * (mCenterY - targetY));float x = (float) (Math.sqrt(distance * distance - (y - targetY) * (y - targetY)) + targetX);canvas.rotate(DEGREE * i, mCenterX, mCenterY);canvas.drawLine(targetX, targetY, x, y, mPaint);canvas.drawLine(mCenterX, mCenterY, targetX, targetY, mPaint);canvas.restore();}}private void drawIcon(Canvas canvas) {for (int i = 0; i < SESAME_IDS.length; i++) {canvas.save();//图片的宽度和高度设置为半径的1 / 3Bitmap bitmap = BitmapFactory.decodeResource(getResources(), SESAME_IDS[i]);//获取图标左上顶点的坐标Point point = getIconPoint(i, 1);int left = point.x;int top = point.y;int right = (int) (left + mIconWidth);int bottom = (int) (top + mIconWidth);Rect rect = new Rect(left, top, right, bottom);canvas.drawBitmap(bitmap, null, rect, mPaint);canvas.restore();}}private void drawText(Canvas canvas) {for (int i = 0; i < SESAME_TITLE.length; i++) {canvas.save();Point point = getIconPoint(i, 1);int left = point.x;int top = point.y;int textLeft = (int) (left - (mPaint.measureText(SESAME_TITLE[i]) / 2 - mIconWidth / 2));int textTop = (int) (top + mIconWidth + ICON_TITLE_MARGIN * 2);canvas.drawText(SESAME_TITLE[i], textLeft, textTop, mPaint);canvas.restore();}}private void drawRegion(Canvas canvas) {mPaint.setAlpha(120);Path path = new Path();canvas.save();for (int i = 0; i < SESAME_DATA.length; i++) {float percent = SESAME_DATA[i] / SESAME_MAX_VALUE;Point point = getVertexPoint(i, percent);int x = point.x;int y = point.y;if (i == 0) {path.moveTo(x, y);} else {path.lineTo(x, y);}}path.close();mPaint.setStyle(Paint.Style.STROKE);canvas.drawPath(path, mPaint);//绘制填充区域mPaint.setStyle(Paint.Style.FILL_AND_STROKE);canvas.drawPath(path, mPaint);canvas.restore();}private void drawScore(Canvas canvas) {canvas.save();mPaint.setTextSize(150);int width = (int) mPaint.measureText("860");canvas.drawText("860", mCenterX - width / 2, mCenterY + ICON_TITLE_MARGIN, mPaint);canvas.restore();}/**I* 获取多边形的顶点* @return*/private Point getVertexPoint(int position, float percent) {/**I* 计算多边形每个顶点的坐标* degree = DEGREE = 360 / POLYGON_COUNT;* 0  mCenterX + mRadius * sin(0 * degree)      mCenterY - mRadius * cos(0 * degree)* 1  mCenterX + mRadius * sin(1 * degree)      mCenterY - mRadius * cos(1* degree)* 2  mCenterX + mRadius * sin(2 * degree)       mCenterY - mRadius * cos(2*degree)*....*/int vertexX = (int) (mCenterX + mRadius * Math.sin(Math.toRadians(position * DEGREE)) * percent);int vertexY = (int) (mCenterY - mRadius * Math.cos(Math.toRadians(position * DEGREE)) * percent);return new Point(vertexX, vertexY);}/*** 获取图标的位置* @param position* @return*/private Point getIconPoint(int position, float percent) {Point point = getVertexPoint(position, percent);int vertexX = point.x;int vertexY = point.y;int left = 0;int top = 0;if (position == 0) {left = (int) (vertexX - mIconWidth / 2);/*** 这里为了让文字能够显示下，自己手动设置 ICON_TITLE_MARGIN * 3* 实际开发中需要自己是调试* 同理，下面的ICON_TITLE_MARGIN都是为了保证图标和雷达分布图之间留有空隙*/top = (int) (vertexY - mIconWidth - ICON_TITLE_MARGIN * 3);} else if (position == 1) {left = vertexX + ICON_TITLE_MARGIN;top = (int) (vertexY - mIconWidth / 2);} else if (position == 2) {left = vertexX;top = vertexY;} else if (position == 3) {left = (int) (vertexX - mIconWidth);top = vertexY;} else if (position == 4) {left = (int) (vertexX - mIconWidth - ICON_TITLE_MARGIN);top = (int) (vertexY - mIconWidth / 2);}return new Point(left, top);}
}

效果图如下：

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