這篇文章主要爲大家詳細介紹了Android自定義控件實現折線圖,具有一定的參考價值,感興趣的小夥伴們可以參考一下
本文實例實現一個如下圖所示的Android折線圖,供大家參考,具體內容如下
首先是控件繪圖區域的劃分,控件左邊取一小部分(控件總寬度的八分之一)繪製表頭,右邊剩餘的部分繪製表格
確定表格的行列數,首先繪製一個三行八列的網格,設置好行列的座標後開始繪製
/*繪製三條橫線*/ for(int i=0;i<3;i++){ canvas.drawLine(textWide, mLineYs[i], totalWidth, mLineYs[i], mPaintLine); } /*繪製八條豎線*/ for(int i=0;i<8;i++){ canvas.drawLine(mLineXs[i], 0, mLineXs[i], totalHeight, mPaintLine); }
網格繪製完成後,開始繪製折線圖
根據輸入的節點數據,分別繪製兩條折線
通過canvas的drawLine方法依次連接兩點即可
在每個數據節點處繪製一個小圓,突出顯示
/*繪製第一條折線的路徑*/ for (int i = 0; i < mPerformance_1.length - 1; i++) { /*折線圖的折線的畫筆設置粗一點*/ mPaintLine.setStrokeWidth(5); /*計算當前節點的座標值*/ float prePointX =mLineXs[i]; float prePointY =mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[i].type]) * animCurrentValue; /*計算下一個節點的座標值*/ float nextPointX=mLineXs[i + 1]; float nextPointY=mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[i + 1].type]) * animCurrentValue; /*連接當前座標和下一個座標,繪製線段*/ canvas.drawLine(prePointX, prePointY, nextPointX, nextPointY, mPaintLine1); /*當前節點座標處繪製小圓*/ canvas.drawCircle(prePointX, prePointY, mSmallDotRadius, mPointPaint); }
兩條折線重合的地方,需要特殊考慮,比如希望兩條折線重合的地方折線變爲白色
設置下兩條折線的畫筆即可
mPaintLine2.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN)); mPaintLine1.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
測試代碼及效果;
final Random random=new Random(); final LineChartView myView=(LineChartView)findViewById(R.id.custom_view); final LineChartView.Performance[] performances1=new LineChartView.Performance[8]; final LineChartView.Performance[] performances2=new LineChartView.Performance[8]; myView.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v){ for(int i=0;i<performances1.length;i++){ switch (random.nextInt(2016)%3){ case 0: performances1[i]= LineChartView.Performance.WIN; break; case 1: performances1[i]= LineChartView.Performance.DRAW; break; case 2: performances1[i]= LineChartView.Performance.LOSE; break; default: performances1[i]= LineChartView.Performance.LOSE; break; } switch (random.nextInt(2016)%3){ case 0: performances2[i]= LineChartView.Performance.WIN; break; case 1: performances2[i]= LineChartView.Performance.DRAW; break; case 2: performances2[i]= LineChartView.Performance.LOSE; break; default: performances1[i]= LineChartView.Performance.LOSE; break; } } myView.setPerformances(performances1,performances2); } });
完整代碼如下:
public class LineChartView extends View { private Context context; /*動畫插值器*/ DecelerateInterpolator mDecelerateInterpolator = new DecelerateInterpolator(); /*動畫刷新的次數*/ private int mDuration = 10; /*當前動畫進度值*/ private int mCurrentTime = 0; private Performance[] mPerformance_1, mPerformance_2; /*兩條折線的顏色*/ private int mLineColor1, mLineColor2; /*繪製表頭文字畫筆*/ private Paint mPaintText = new Paint(); /*繪製表格的畫筆*/ private Paint mPaintLine = new Paint(); /*第一條折線的畫筆*/ private Paint mPaintLine1 =new Paint(); /*第二條折線的畫筆*/ private Paint mPaintLine2 =new Paint(); /*座標點的小圓點畫筆*/ private Paint mPointPaint = new Paint(); private float mSmallDotRadius = 4; private TypedValue typedValue; private int mPaintClolor; /*Handler刷新界面產生動畫效果*/ private Handler mHandler = new Handler(); private Runnable mAnimation = new Runnable() { @Override public void run() { if (mCurrentTime < mDuration) { mCurrentTime++; LineChartView.this.invalidate(); } } }; public LineChartView(Context context) { super(context); this.context=context; init(); } public LineChartView(Context context, AttributeSet attrs) { super(context, attrs); this.context=context; init(); } public LineChartView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); this.context=context; init(); } public enum Performance { WIN(0), DRAW(1), LOSE(2); public int type; Performance(int type) { this.type = type; } } public void setPerformances(Performance[] performance1, Performance[] performance2) { if (performance1 == null) { performance1 = new Performance[0]; } if (performance2 == null) { performance2 = new Performance[0]; } mPerformance_1 = Arrays.copyOf(performance1, performance1.length > 8 ? 8 : performance1.length); mPerformance_2 = Arrays.copyOf(performance2, performance2.length > 8 ? 8 : performance2.length); if (isShown()) { mCurrentTime = 0; this.invalidate(); } } /** * 設置折線1的顏色 * * @param mLineColor1 */ public void setLineColor1(int mLineColor1) { this.mLineColor1 = mLineColor1; } /** * 設置折線2的顏色 * * @param mLineColor2 */ public void setLineColor2(int mLineColor2) { this.mLineColor2 = mLineColor2; } private void init() { mLineColor1=Color.BLUE; mLineColor2 = Color.GREEN; typedValue=new TypedValue(); context.getTheme().resolveAttribute(R.attr.title_bar,typedValue,true); mPaintClolor =getResources().getColor(typedValue.resourceId); final LineChartView.Performance[] performances1=new LineChartView.Performance[8]; final LineChartView.Performance[] performances2=new LineChartView.Performance[8]; final Random random=new Random(); for(int i=0;i<performances1.length;i++){ switch (random.nextInt(2016)%3){ case 0: performances1[i]= LineChartView.Performance.WIN; break; case 1: performances1[i]= LineChartView.Performance.DRAW; break; case 2: performances1[i]= LineChartView.Performance.LOSE; break; default: performances1[i]= LineChartView.Performance.LOSE; break; } switch (random.nextInt(2016)%3){ case 0: performances2[i]= LineChartView.Performance.WIN; break; case 1: performances2[i]= LineChartView.Performance.DRAW; break; case 2: performances2[i]= LineChartView.Performance.LOSE; break; default: performances1[i]= LineChartView.Performance.LOSE; break; } } setPerformances(performances1,performances2); } /** * @param canvas */ @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /*獲取控件總寬高*/ float totalWidth = getWidth(); float totalHeight = getHeight(); /*左邊取總寬度的八分之一繪製表格頭部*/ float textWide = totalWidth / 8; /*左邊留一點空白*/ float left_offset = 10; /*折線圖的總寬度等於控件的總寬度減去表頭和留白*/ float chartWide = totalWidth - textWide - left_offset; /*一共三行,設置每一行的垂直座標*/ float[] mLineYs = new float[]{totalHeight / 8, totalHeight / 2, totalHeight * 7 / 8}; /*一共八列,設置每一列的水平座標*/ float[] mLineXs = new float[]{ textWide + left_offset + chartWide * 0 / 8, textWide + left_offset + chartWide * 1 / 8, textWide + left_offset + chartWide * 2 / 8, textWide + left_offset + chartWide * 3 / 8, textWide + left_offset + chartWide * 4 / 8, textWide + left_offset + chartWide * 5 / 8, textWide + left_offset + chartWide * 6 / 8, textWide + left_offset + chartWide * 7 / 8, }; /*繪製表頭文字*/ mPaintText.setStyle(Paint.Style.FILL); mPaintText.setColor(mPaintClolor); mPaintText.setAlpha(226); mPaintText.setTextSize(28); /*從中間開始繪製*/ mPaintText.setTextAlign(Paint.Align.CENTER); /*測量文字大小,並計算偏移量*/ Paint.FontMetrics fontMetrics = mPaintText.getFontMetrics(); float textBaseLineOffset = (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom; canvas.drawText("勝場", textWide / 2, mLineYs[0] + textBaseLineOffset, mPaintText); canvas.drawText("平局", textWide / 2, mLineYs[1] + textBaseLineOffset, mPaintText); canvas.drawText("負場", textWide / 2, mLineYs[2] + textBaseLineOffset, mPaintText); /*繪製表格畫筆設置*/ mPaintLine.setStyle(Paint.Style.STROKE); mPaintLine.setAntiAlias(true); mPaintLine.setColor(mPaintClolor); mPaintLine.setAlpha(80); mPaintLine.setStrokeWidth(1); /*開始繪製表格*/ /*繪製三條橫線*/ for(int i=0;i<3;i++){ canvas.drawLine(textWide, mLineYs[i], totalWidth, mLineYs[i], mPaintLine); } /*繪製八條豎線*/ for(int i=0;i<8;i++){ canvas.drawLine(mLineXs[i], 0, mLineXs[i], totalHeight, mPaintLine); } /*折線圖畫筆設置*/ mPaintLine1.setStyle(Paint.Style.STROKE); /*設置透明度,取值範圍爲0~255,數值越小越透明,0表示完全透明*/ mPaintLine1.setAlpha(0); mPaintLine1.setAntiAlias(true); mPaintLine1.setColor(mLineColor1); mPaintLine1.setStrokeWidth(5); mPaintLine2.setStyle(Paint.Style.STROKE); /*設置透明度,取值範圍爲0~255,數值越小越透明,0表示完全透明*/ mPaintLine2.setAlpha(0); mPaintLine2.setAntiAlias(true); mPaintLine2.setColor(mLineColor2); mPaintLine2.setStrokeWidth(5); if (typedValue.resourceId==R.color.white){ /*PorterDuff.Mode.SCREEN 上下層都顯示。*/ mPaintLine2.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN)); mPaintLine1.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN)); }else { /*PorterDuff.Mode.DARKEN 上下層都顯示。變暗*/ mPaintLine2.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DARKEN)); mPaintLine1.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DARKEN)); } /*畫節點處的小圓點的畫筆設置*/ mPointPaint.setStyle(Paint.Style.STROKE); mPointPaint.setAntiAlias(true); mPointPaint.setColor(mPaintClolor); /*計算當前動畫進度對應的數值*/ float animCurrentValue = mDecelerateInterpolator.getInterpolation(1.0f * mCurrentTime / mDuration); mPaintLine.setColor(mLineColor1); /*繪製第一條折線的路徑*/ for (int i = 0; i < mPerformance_1.length - 1; i++) { /*折線圖的折線的畫筆設置粗一點*/ mPaintLine.setStrokeWidth(5); /*計算當前節點的座標值*/ float prePointX =mLineXs[i]; float prePointY =mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[i].type]) * animCurrentValue; /*計算下一個節點的座標值*/ float nextPointX=mLineXs[i + 1]; float nextPointY=mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[i + 1].type]) * animCurrentValue; /*連接當前座標和下一個座標,繪製線段*/ canvas.drawLine(prePointX, prePointY, nextPointX, nextPointY, mPaintLine1); /*當前節點座標處繪製小圓*/ canvas.drawCircle(prePointX, prePointY, mSmallDotRadius, mPointPaint); } /*第一個折線圖的最後一個節點的座標*/ float lastPointX=mLineXs[mPerformance_1.length - 1]; float lastPointY= mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_1[mPerformance_1.length - 1].type]) * animCurrentValue; /*繪製最後一個節點的外圍小圓*/ canvas.drawCircle(lastPointX,lastPointY ,mSmallDotRadius, mPointPaint); /*繪製第二條折線*/ mPaintLine.setColor(mLineColor2); for (int i = 0; i < mPerformance_2.length - 1; i++) { /*折線圖的折線的畫筆設置粗一點*/ mPaintLine.setStrokeWidth(5); /*計算當前節點的座標值*/ float prePointX =mLineXs[i]; float prePointY =mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_2[i].type]) * animCurrentValue; /*計算下一個節點的座標值*/ float nextPointX=mLineXs[i + 1]; float nextPointY=mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_2[i + 1].type]) * animCurrentValue; /*連接當前座標和下一個座標,繪製線段*/ canvas.drawLine(prePointX, prePointY, nextPointX, nextPointY, mPaintLine2); /*當前節點座標處繪製小圓*/ canvas.drawCircle(prePointX, prePointY, mSmallDotRadius, mPointPaint); } /*第一個折線圖的最後一個節點的座標*/ lastPointX=mLineXs[mPerformance_2.length - 1]; lastPointY= mLineYs[2] - (mLineYs[2] - mLineYs[mPerformance_2[mPerformance_2.length - 1].type]) * animCurrentValue; /*繪製最後一個節點的外圍小圓*/ canvas.drawCircle(lastPointX,lastPointY ,mSmallDotRadius, mPointPaint); mHandler.postDelayed(mAnimation, 20); } }
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持神馬文庫。