這篇文章主要介紹Android開(kāi)發(fā)如何繪制淘寶收益圖折線效果,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
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實(shí)現(xiàn)的效果我一會(huì)貼上,我先說(shuō)下原理,我們知道要實(shí)現(xiàn)在canvas上畫(huà)線,不就是要搞一個(gè)paint嘛,然后首先肯定要設(shè)置下paint的屬性,那么畫(huà)文字呢,不就是Textpaint嗎,對(duì),就是這么簡(jiǎn)單,接下來(lái)怎么畫(huà),折線圖主要分為X軸和y軸,x軸表示日期,y表示收益,好,說(shuō)道這里,大家應(yīng)該知道怎么去做了,下面直接貼代碼
這個(gè)方法是,畫(huà)x,y坐標(biāo)系的,以及上面的日期和收益了
private void drawCoordinate(Canvas canvas) { //坐標(biāo)系畫(huà)筆 Paint coordinatePaint = new Paint(); coordinatePaint.setAntiAlias(true); coordinatePaint.setStrokeWidth(1); coordinatePaint.setColor(getResources().getColor(R.color.c5)); //坐標(biāo)系文字畫(huà)筆 TextPaint coordinateTextPaint = new TextPaint(); coordinateTextPaint.setAntiAlias(true); coordinateTextPaint.setTextSize(scaleTextSize); coordinateTextPaint.setAntiAlias(true); coordinateTextPaint.setColor(scaleTextColor); coordinateTextPaint.setTextAlign(Align.CENTER); //水平的刻度線 float verticalScaleStep = getVerticalScaleStep(); coordinateTextPaint.setTextAlign(Align.RIGHT); float textHeight = getTextHeight(coordinateTextPaint, "8"); for (int i = 0; i < maxVerticalScaleValue; i++) { float y = getHeight() - bottomPadding - (verticalScaleStep * i); canvas.drawLine(leftPadding, y, getWidth() - rightPadding, y, coordinatePaint); canvas.drawText(i + "", leftPadding - 13, y + textHeight / 2, coordinateTextPaint); } //垂直的刻度線 float horizontalScaleStep = getHorizontalScaleStep(); for (int i = 0; i < line.getSize(); i++) { float x = leftPadding + (horizontalScaleStep * i); if (i == 0) { canvas.drawLine(x, topPadding, x, getHeight() - bottomPadding, coordinatePaint); } coordinateTextPaint.setColor(mTouchIndex == i ? verticalLineColor : scaleTextColor); coordinateTextPaint.setTextAlign(i == 0 ? Align.LEFT : Align.CENTER); canvas.drawText(line.getPoint(i).getX(), x, getHeight() - bottomPadding + textHeight + 10, coordinateTextPaint); } }
但是產(chǎn)品有個(gè)需求啊,就是點(diǎn)擊當(dāng)前日期可以查看我的收益,并且在交匯點(diǎn)上展示出來(lái)
private void drawCurve(Canvas canvas) { Paint curvePaint = new Paint();//曲線畫(huà)筆 curvePaint.setColor(curveColor); curvePaint.setAntiAlias(true); curvePaint.setStrokeWidth(curveStrokeWidth); float horizontalScaleStep = getHorizontalScaleStep(); float lastXPixels = 0, newYPixels = 0; float lastYPixels = 0, newXPixels = 0; float useHeight = getHeight() - bottomPadding - topPadding; for (int i = 0; i < line.getSize(); i++) { float yPercent = line.getPoint(i).getY() / maxVerticalScaleValue; if (i == 0) { lastXPixels = leftPadding + i * horizontalScaleStep; lastYPixels = getHeight() - bottomPadding - useHeight * yPercent; } else { newXPixels = leftPadding + i * horizontalScaleStep; newYPixels = getHeight() - bottomPadding - useHeight * yPercent; canvas.drawLine(lastXPixels, lastYPixels, newXPixels, newYPixels, curvePaint); lastXPixels = newXPixels; lastYPixels = newYPixels; } line.getPoint(i).fLineX = lastXPixels; line.getPoint(i).fLineY = lastYPixels; } }
點(diǎn)擊交匯點(diǎn),有文字提示說(shuō)明,
private void drawTipRect(Canvas canvas) { if (mTouchIndex == -1) return; LinePoint point = line.getPoint(mTouchIndex); float x = point.fLineX; float y = point.fLineY; // 描繪豎線 Paint paint = new TextPaint(); PathEffect effects = new DashPathEffect(new float[]{5, 5, 5, 5}, 1); paint.setPathEffect(effects); paint.setAntiAlias(true); paint.setStrokeWidth(verticalLineStrokeWidth); paint.setColor(verticalLineColor); canvas.drawLine(x, topPadding, x, getHeight() - bottomPadding, paint); //描繪交匯圓點(diǎn) paint.setPathEffect(null); paint.setStyle(Paint.Style.FILL_AND_STROKE); paint.setColor(Color.WHITE); canvas.drawCircle(x, y, circleRadius, paint); paint.setStyle(Paint.Style.STROKE); paint.setColor(circleColor); paint.setStrokeWidth(circleStrokeWidth); canvas.drawCircle(x, y, circleRadius, paint); float midY = (topPadding + getHeight() - bottomPadding) / 2; float midX = (leftPadding + getWidth() - rightPadding) / 2; //描繪圓角矩形 TextPaint textPaint = new TextPaint(); textPaint.setTextSize(tipTextSize); textPaint.setTextAlign(Align.CENTER); textPaint.setColor(tipTextColor); textPaint.setAntiAlias(true); String label = tipPrefix + point.getY(); float textWidth = textPaint.measureText(label) + 15; float textHeight = getTextHeight(textPaint, label) + 8; float hMargin = 10;//水平間距 float vMargin = 8;//垂直間距 float w = textWidth + hMargin * 2;//寬 float h = textHeight + vMargin * 2;//高 RectF rect = new RectF(); if (x > midX) { rect.right = x - hMargin; rect.left = x - w; } else { rect.left = x + hMargin; rect.right = x + w; } if (y > midY) { rect.top = y - h; rect.bottom = y - vMargin; } else { rect.bottom = y + h; rect.top = y + vMargin; } Paint roundRectPaint = new Paint(); roundRectPaint.setColor(tipRectColor); roundRectPaint.setStyle(Paint.Style.FILL); roundRectPaint.setAntiAlias(true); canvas.drawRoundRect(rect, 3, 3, roundRectPaint); // 描繪圓角矩形中間的文字 float roundTextX = (rect.left + rect.right) / 2; float roundTextY = (rect.top + rect.bottom + getTextHeight(textPaint, label)) / 2; canvas.drawText(label, roundTextX, roundTextY, textPaint); }
好了核心的代碼就這么多了,由于我們把它當(dāng)做的是控件再用,那么我們?cè)诔跏蓟臅r(shí)候,肯定會(huì)引入一些自定義的樣式表,
private void initViews(AttributeSet attrs, int defStyle) { TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.LineGraph, defStyle, 0); scaleTextSize = typedArray.getDimension(R.styleable.LineGraph_scale_text_size, 20); scaleTextColor = typedArray.getColor(R.styleable.LineGraph_scale_text_color, getResources().getColor(R.color.c5)); tipRectColor = typedArray.getColor(R.styleable.LineGraph_tip_rect_color, getResources().getColor(R.color.c8)); tipTextSize = typedArray.getDimension(R.styleable.LineGraph_tip_text_size, 22); tipTextColor = typedArray.getColor(R.styleable.LineGraph_tip_text_color, getResources().getColor(R.color.c12)); curveStrokeWidth = typedArray.getDimension(R.styleable.LineGraph_curve_stroke_width, 4); curveColor = typedArray.getColor(R.styleable.LineGraph_curve_color, getResources().getColor(R.color.c8)); verticalLineStrokeWidth = typedArray.getDimension(R.styleable.LineGraph_vertical_line_stroke_width, 2); verticalLineColor = typedArray.getColor(R.styleable.LineGraph_vertical_line_color, getResources().getColor(R.color.c8)); circleStrokeWidth = typedArray.getDimensionPixelSize(R.styleable.LineGraph_circle_stroke_width, 3); circleColor = typedArray.getColor(R.styleable.LineGraph_circle_color, getResources().getColor(R.color.c8)); circleRadius = typedArray.getDimensionPixelSize(R.styleable.LineGraph_circle_radius, 7); typedArray.recycle(); bottomPadding = dip2px(getContext(), 20); topPadding = dip2px(getContext(), 10); leftPadding = dip2px(getContext(), 20); rightPadding = dip2px(getContext(), 10); }
樣式表文件我就不多說(shuō)了,行如下面的格式,
最后貼上個(gè)效果圖:
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