本文实例为大家分享了Android自定义控件实现雷达图的具体代码,供大家参考,具体内容如下 学习了大神的源代码(奈何不知大神的博客地址),觉得必须记录一下,方便以后再次学习
本文实例为大家分享了Android自定义控件实现雷达图的具体代码,供大家参考,具体内容如下
学习了大神的源代码(奈何不知大神的博客地址),觉得必须记录一下,方便以后再次学习。
效果如图所示:
1.自定义雷达图控件:
public class MyPolygonView extends View { //-------------我们必须给的模拟数据------------- //n边形 private int n = 6; //每个角对应的文字 private String[] text = new String[]{"语文", "数学", "英语", "生物", "化学","物理"}; //区域等级,值不能超过n边形的个数(每个角对应的值到达的层数) private int[] area = new int[]{3,3,2,2,3,2}; //-------------View相关------------- //View自身的宽和高 private int mHeight; private int mWidth; //-------------画笔相关------------- //边框的画笔 private Paint borderPaint; //文字的画笔 private Paint textPaint; //区域的画笔 private Paint areaPaint; //-------------多边形相关------------- //n边形个数 private int num = 4; //两个多边形之间的半径 private int r = 60; //n边形顶点坐标 private float x, y; //n边形角度 private float angle = (float) ((2 * Math.PI) / n); //文字与边框的边距等级,值越大边距越小(文字与边框的距离) private int textAlign = 5; //-------------颜色相关------------- //边框颜色(整个n边型的区域颜色) private int mColor = getResources().getColor(R.color.app_polygon); //文字颜色 private int textColor = getResources().getColor(R.color.app_black); //区域颜色(整个连线的颜色) private int strengthColor = Color.parseColor("#f9c172"); public MyPolygonView(Context context) { super(context); } public MyPolygonView(Context context, AttributeSet attrs) { super(context, attrs); } public MyPolygonView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mWidth = w; mHeight = h; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //初始化画笔 initPaint(); //画布移到中心点 canvas.translate(mWidth / 2, mHeight / 2); //画n边形 drawPolygon(canvas); //画n边形的中点到顶点的线 drawLine(canvas); //画文字 drawText(canvas); //画蓝色区域 drawArea(canvas); } /** * 初始化画笔 */ private void initPaint() { //边框画笔 borderPaint = new Paint(); borderPaint.setAntiAlias(true); borderPaint.setStyle(Paint.Style.FILL_AND_STROKE); borderPaint.setColor(mColor); borderPaint.setStrokeWidth(3); //文字画笔 textPaint = new Paint(); textPaint.setTextSize(30); textPaint.setColor(textColor); textPaint.setAntiAlias(true); //区域画笔 areaPaint = new Paint(); areaPaint.setStrokeWidth(5); areaPaint.setColor(strengthColor); areaPaint.setAntiAlias(true); areaPaint.setStyle(Paint.Style.STROKE); } /** * 绘制多边形 * * @param canvas */ private void drawPolygon(Canvas canvas) { Path path = new Path(); //n边形数目 for (int j = 1; j <= num; j++) { float r = j * this.r; path.reset(); //画n边形 for (int i = 1; i <= n; i++) { x = (float) (Math.cos(i * angle) * r); y = (float) (Math.sin(i * angle) * r); if (i == 1) { path.moveTo(x, y); } else { path.lineTo(x, y); } } //关闭当前轮廓。如果当前点不等于第一个点的轮廓,一条线段是自动添加的 path.close(); canvas.drawPath(path, borderPaint); } } /** * 画多边形线段 * * @param canvas */ private void drawLine(Canvas canvas) { Path path = new Path(); float r = num * this.r; for (int i = 1; i <= n; i++) { path.reset(); x = (float) (Math.cos(i * angle) * r); y = (float) (Math.sin(i * angle) * r); path.lineTo(x, y); canvas.drawPath(path, borderPaint); } } /** * 画文字 * * @param canvas */ private void drawText(Canvas canvas) { float r = num * this.r; for (int i = 1; i <= n; i++) { //测量文字的宽高 Rect rect = new Rect(); textPaint.getTextBounds(text[i - 1], 0, text[i - 1].length(), rect); float textWidth = rect.width(); float textHeight = rect.height(); x = (float) (Math.cos(i * angle) * r); y = (float) (Math.sin(i * angle) * r); //位置微调 if (x < 0) { x = x - textWidth; } if (y > 25) { y = y + textHeight; } //调文字与边框的边距 float LastX = x + x / num / textAlign; float LastY = y + y / num / textAlign; canvas.drawText(text[i - 1],LastX, LastY, textPaint); } } /** * 画区域 * * @param canvas */ private void drawArea(Canvas canvas) { Path path = new Path(); for (int i= 1; i<= n; i++) { float r = area[i - 1] * this.r; x = (float) (Math.cos(i * angle) * r); y = (float) (Math.sin(i * angle) * r); if (i == 1) { path.moveTo(x, y); } else { path.lineTo(x, y); } } //关闭当前轮廓。如果当前点不等于第一个点的轮廓,一条线段是自动添加的 path.close(); canvas.drawPath(path, areaPaint); } public void setArea (int[] area){ this.area =area; invalidate(); } }
2.界面布局文件xml中直接使用:
<com.lotus.chartspagedemo.MyPolygonView android:id="@+id/polygon" android:layout_width="match_parent" android:layout_height="match_parent" android:visibility="visible" />
3.界面activity中可以设置控件颜色:
polygon.setBackgroundColor(getResources().getColor(R.color.app_blue));//雷达图的背景颜色
如果不设置背景颜色,效果就是:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持自由互联。