LineChartView—自定义折线统计图

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.view.View;

import java.util.ArrayList;
import java.util.List;

/**
* Created by hdz on 2017/1/12.
*/

public class LineChartView extends View {

private String titleText="鍚堝悓璁″垝";private int startPointX;private int startPointY;private int deltaX;    //the delta between two x_valueprivate int deltaY;private int countX;   //the count of the x (for example a week is seven and a  year is twelve)private int countY;private float paddingLeft;private float paddingRight;private float textSize;private Paint paint;private Paint linePaint;private TextPaint textPaint;private Path path;private List<Integer> dataList;public LineChartView(Context context) {    this(context, null);}public LineChartView(Context context, AttributeSet attrs) {    this(context, attrs, 0);}public LineChartView(Context context, AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    initAttrs(context, attrs, defStyleAttr);    init();}private void initAttrs(Context context, AttributeSet attrs, int defStyleAttr) {    TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.LineChartView, defStyleAttr, 0);    titleText = array.getString(R.styleable.LineChartView_line_title_text);    startPointX = array.getInteger(R.styleable.LineChartView_line_start_point_x, 0);    startPointY = array.getInteger(R.styleable.LineChartView_line_start_point_y, 0);    deltaX = array.getInteger(R.styleable.LineChartView_line_delta_x, 0);    deltaY = array.getInteger(R.styleable.LineChartView_line_delta_y, 0);    countX = array.getInteger(R.styleable.LineChartView_line_conut_x, 0);    countY = array.getInteger(R.styleable.LineChartView_line_conut_y, 0);

// paddingLeft = array.getDimensionPixelSize(R.styleable.LineChartView_line_padding_left, 0);
// paddingRight = array.getDimensionPixelSize(R.styleable.LineChartView_line_padding_right, 0);
textSize = array.getDimensionPixelSize(R.styleable.LineChartView_line_text_size, 0);
array.recycle();
}

private void init() {    paint = new Paint();    paint.setAntiAlias(true);    paint.setStrokeWidth(5);    textPaint = new TextPaint();    textPaint.setAntiAlias(true);    path = new Path();    linePaint = new Paint();    linePaint.setColor(0xff2665ac);    linePaint.setAntiAlias(true);    linePaint.setStyle(Paint.Style.STROKE);    linePaint.setStrokeWidth(5);    dataList = new ArrayList<Integer>();    dataList.add(56);    dataList.add(76);    dataList.add(89);    dataList.add(36);    dataList.add(90);    dataList.add(19);    dataList.add(80);    dataList.add(80);}private void setList(List<Integer> dataList) {    this.dataList = dataList;    invalidate();}@Overrideprotected void onDraw(Canvas canvas) {    super.onDraw(canvas);    //get the padding    int paddingLeft = getPaddingLeft();    int paddingRight = getPaddingRight();    int paddingBottom = getPaddingBottom();    int paddingTop = getPaddingTop();    int height = getHeight();    int width = getWidth();    textPaint.setColor(0xff2665ac);    textPaint.setTextSize(textSize);    canvas.drawText(titleText, 0.5f * width - textPaint.measureText(titleText) * 0.5f, paddingTop + textPaint.getFontMetrics().bottom * 4, textPaint);    //琛ㄦ牸鐨勮捣濮嬬偣    float startY = (textPaint.getFontMetrics().bottom * 4) * 2 + paddingTop;    float startX = textSize * 2 + paddingLeft;    float endY = height - textSize * 3 - paddingBottom;    float endX = width - (textSize + paddingRight);    //textSize * 2  杩欐绌洪棿鏄敤鏉ュ啓妯潗鏍囩殑    //height - startY - textSize * 3 - paddingBottom   鐢ㄤ簬鐢诲浘鐨勯珮搴?    float chartHeight = endY - startY;    float chartWidth = endX - startX;    float deltaDistanceY = chartHeight / countY;    float deltaDistanceX = chartWidth / countX;    //鐢绘í绾?     for (int i = 0; i <= countY; i++) {        if (i == countY) {            paint.setColor(0xff000000);        } else {            paint.setColor(0xffdddddd);        }        String numberY = ((countY - i) * deltaY) + "";        canvas.drawText(numberY, startX - (0.5f * textSize + textPaint.measureText(numberY)), startY + deltaDistanceY * i + textPaint.getFontMetrics().bottom * 2, textPaint);        canvas.drawLine(startX, startY + i * deltaDistanceY, endX, startY + i * deltaDistanceY, paint);    }    //鐢荤珫绾?    for (int i = 0; i <= countX; i++) {        if (i == 0) {            paint.setColor(0xff000000);        } else {            paint.setColor(0xffdddddd);        }        String numberX = "" + (startPointX + i * deltaX);        canvas.drawLine(startX + i * deltaDistanceX, startY, startX + i * deltaDistanceX, endY, paint);        canvas.drawText(numberX, startX + i * deltaDistanceX - textPaint.measureText(numberX) * 0.5f, endY + textPaint.getFontMetrics().bottom * 4 + 5, textPaint);    }    //鐢绘姌绾?    path.moveTo(startX, endY - dataList.get(0) * 1.0f / deltaY * deltaDistanceY);    for (int i = 0; i < dataList.size(); i++) {        float cx = startX + i * deltaDistanceX;        float cy = endY - dataList.get(i) * 1.0f / deltaY * deltaDistanceY;        canvas.drawText(dataList.get(i) + "", cx - textPaint.measureText(dataList.get(i) + "") * 0.5f, cy - textPaint.getFontMetrics().bottom * 3, textPaint);        paint.setColor(Color.RED);        canvas.drawCircle(cx, cy, 15, paint);        paint.setColor(Color.WHITE);        canvas.drawCircle(cx, cy, 10, paint);        paint.setColor(Color.RED);        canvas.drawCircle(cx, cy, 5, paint);        if (i == 0) {        } else {            path.lineTo(cx, cy);        }    }    canvas.drawPath(path, linePaint);}

}