line-charts

[piyafang]

it cannot work for drawing line-charts, when you add the kind of line-charts? thanks

[hawx1993]

sorry暂不支持

[xiaoyedeng]

很棒，自己又加入了折线图和曲线图，效果不错。

[Bleoo]

麻烦加入折线图

[jaysonsmart]

能不能给我发一份 @xiaoyedeng

[xiaoyedeng]

//平滑曲线图
else if (type == 'curve') {
    var arr = params.data,
        showYAxis = params.showYAxis,
        colors = params.colors || "#fb999a",
        cHeight = params.cHeight || 300,//表格高度
        cWidth = params.cWidth || 500,//表格宽度
        bWidth = params.bWidth,//每根柱状图宽度
        xCaption = params.xCaption || '', //x轴底部说明文字
        yCaption = params.yCaption || '', //y轴底部说明文字
        bMargin = params.bMargin;//柱子间距


    var cxt = wx.createContext();
    //chart property
    var cMargin, cSpace;
    var cMarginSpace, cMarginHeight;

    //single bar property
    var totalBars, maxValue;

    //bar animation
    var flag, t100, speed;

    //Y axis property
    var totLabelsOnYAxis;

    function chartSet() {

        // chart properties
        cMargin = -50;//图表与canvas边界距离
        cSpace = 50;
        if (showYAxis) {
            cMargin = 10;
        }
        cMarginSpace = cMargin + cSpace;//0,y轴与左边文字距离
        cMarginHeight = 40 * 2 + cHeight;//canvas顶部距离
        // bar properties
        totalBars = arr.length;
        // find maximum value on chart
        maxValue = 0;
        for (var i = 0; i < arr.length; i++) {
            var arrVal = arr[i].split(",");
            var barVal = parseInt(arrVal[1]);
            if (parseInt(barVal) > parseInt(maxValue))
                maxValue = barVal;//获取最大值
        }
        totLabelsOnYAxis = 10;
        // 初始化动画参数
        flag = 0;
        t100 = 100;
        speed = 100;
    }

    // draw chart axis, labels and markers
    function drawAxisLabelMarkers() {
        cxt.lineWidth = "1.0";
        // draw y axis
        drawAxis(cMarginSpace, cMarginHeight, cMarginSpace, cMargin);
        // draw x axis
        //x轴与y轴水平距离,x与y垂直距离，x轴宽度
        drawAxis(cMarginSpace, cMarginHeight, cMarginSpace + cWidth + 20, cMarginHeight);
        cxt.lineWidth = "1.0";
        drawMarkers();
    }

    //画轴
    function drawAxis(x, y, X, Y) {
        cxt.beginPath();
        cxt.moveTo(x, y);
        cxt.lineTo(X, Y);
        cxt.setStrokeStyle("#cccccc");//x Axis and y Axis border color
        cxt.closePath();
        cxt.stroke();
    }

    // 画轴文字
    function drawMarkers() {
        var numMarkers = parseInt(maxValue / totLabelsOnYAxis);
        cxt.textAlign = "center";
        // Y Axis
        for (var a = 0; a <= totLabelsOnYAxis; a++) {
            var markerVal = a * numMarkers;
            var markerValHt = a * numMarkers * cHeight;
            var xMarkers = cMarginSpace - 25;//y轴数值与Y轴距离
            var yMarkers = cMarginHeight - (markerValHt / maxValue);
            cxt.setFontSize(10);
            cxt.fillText(markerVal, xMarkers, yMarkers);
        }
        // X Axis
        cxt.textAlign = 'center';
        for (var b = 0; b < totalBars; b++) {
            var arrVal = arr[b].split(",");
            var name = arrVal[0];
            var markerXPos = (cMarginSpace + bMargin)
                + (b * (bWidth + bMargin)) + (bWidth / 2) - 10;
            var markerYPos = cMarginHeight + 20;//x轴数值与x轴距离
            cxt.setFontSize(10);
            cxt.fillText(name, markerXPos, markerYPos);//x轴底部文字
        }
        cxt.save();
        // Add Y Axis title
        cxt.translate(cMargin + 10, cHeight / 2);
        cxt.rotate(Math.PI * -90 / 180);
        cxt.fillText(yCaption, 0, 0);
        cxt.restore();
        // Add X Axis Title
        cxt.setFontSize(10);
        cxt.fillText(xCaption, cMarginSpace +
        (cWidth / 4), 20);//底部文字与x轴距离
    }

    //画数据
    function drawChartWithAnimation() {
        if (flag < t100) {
            flag = flag + 1;
            setTimeout(drawChartWithAnimation, speed);
        }

        var point = [];
        for (i = 0; i < arr.length; i++) {
            var y = arr[i].split(",");
            var bVal = parseInt(y[1]);//获取树状图数值

            var bHt = (bVal * cHeight / maxValue) / flag;//bar height

            var bX = cMarginSpace + (i * (bWidth + bMargin)) + bMargin;
            var bY = cMarginHeight - bHt - 2;//cMarginHeight=> 380

            point.push({x: bX, y: bY});
        }

        cxt.strokeStyle = "white";
        cxt.lineWidth = 3;
        cxt.beginPath();
        cxt.font = "20px SimSun";
        cxt.fillStyle = "#ffffff";
        for (var i = 0; i < point.length; i++) {

            var y = arr[i].split(",");
            var bVal = parseInt(y[1]);//获取树状图数值
            var bHt = (bVal * cHeight / maxValue) / flag;//bar height
            var bY = cMarginHeight - bHt - 2;//cMarginHeight=> 380

            if (i == 0) {
                cxt.moveTo(point[i].x, point[i].y);
            } else {//注意是从1开始
                var ctrlP = getCtrlPoint(point, i - 1);
                cxt.bezierCurveTo(ctrlP.pA.x, ctrlP.pA.y, ctrlP.pB.x, ctrlP.pB.y, point[i].x, point[i].y);
                //cxt.fillText("("+point[i].x+","+point[i].y+")",point[i].x,point[i].y);
                cxt.setFillStyle("#000000");//singer bar number color
                cxt.fillText(bVal, point[i].x + 4, point[i].y);//singer bar number
            }
        }
        cxt.stroke();
    }

    function getCtrlPoint(ps, i, a, b) {
        if (!a || !b) {
            a = 0.25;
            b = 0.25;
        }
        //处理两种极端情形
        if (i < 1) {
            var pAx = ps[0].x + (ps[1].x - ps[0].x) * a;
            var pAy = ps[0].y + (ps[1].y - ps[0].y) * a;
        } else {
            var pAx = ps[i].x + (ps[i + 1].x - ps[i - 1].x) * a;
            var pAy = ps[i].y + (ps[i + 1].y - ps[i - 1].y) * a;
        }
        if (i > ps.length - 3) {
            var last = ps.length - 1
            var pBx = ps[last].x - (ps[last].x - ps[last - 1].x) * b;
            var pBy = ps[last].y - (ps[last].y - ps[last - 1].y) * b;
        } else {
            var pBx = ps[i + 1].x - (ps[i + 2].x - ps[i].x) * b;
            var pBy = ps[i + 1].y - (ps[i + 2].y - ps[i].y) * b;
        }
        return {
            pA: {x: pAx, y: pAy},
            pB: {x: pBx, y: pBy}
        }
    }

    //初始化
    chartSet();
    //画数轴
    drawAxisLabelMarkers();
    //画数据
    drawChartWithAnimation();

    wx.drawCanvas({
        canvasId: canvasId,
        actions: cxt.getActions()
    });
}

@jaysonsmart 曲线图的，新增一个类型curve 加进去就可以

[xiaoyedeng]

//折线图
else if (type == 'fold') {
    var arr = params.data,
        showYAxis = params.showYAxis,
        colors = params.colors || "#fb999a",
        cHeight = params.cHeight || 300,//表格高度
        cWidth = params.cWidth || 500,//表格宽度
        bWidth = params.bWidth || 20,//每根柱状图宽度
        xCaption = params.xCaption || '', //x轴底部说明文字
        yCaption = params.yCaption || '', //y轴底部说明文字
        bMargin = params.bMargin || 16;//柱子间距

    var cxt = wx.createContext();
    //chart property
    var cMargin, cSpace;
    var cMarginSpace, cMarginHeight;

    //single bar property
    var totalBars, maxValue;

    //bar animation
    var flag, t100, speed;

    //Y axis property
    var totLabelsOnYAxis;

    function chartSet() {

        // chart properties
        cMargin = -50;//图表与canvas边界距离
        cSpace = 50;
        if (showYAxis) {
            cMargin = 10;
        }
        cMarginSpace = cMargin + cSpace;//0,y轴与左边文字距离
        cMarginHeight = 40 * 2 + cHeight;//canvas顶部距离
        // bar properties
        totalBars = arr.length;
        // find maximum value on chart
        maxValue = 0;
        for (var i = 0; i < totalBars; i++) {
            var arrVal = arr[i].split(",");
            var barVal = parseInt(arrVal[1]);
            if (parseInt(barVal) > parseInt(maxValue))
                maxValue = barVal;//获取最大值
        }
        totLabelsOnYAxis = 10;
        // 初始化动画参数
        flag = 0;
        t100 = 100;
        speed = 10;
    }

    // draw chart axis, labels and markers
    function drawAxisLabelMarkers() {
        cxt.lineWidth = "1.0";
        // draw y axis
        drawAxis(cMarginSpace, cMarginHeight, cMarginSpace, cMargin);
        // draw x axis
        //x轴与y轴水平距离,x与y垂直距离，x轴宽度
        drawAxis(cMarginSpace, cMarginHeight, cMarginSpace + cWidth + 20, cMarginHeight);
        cxt.lineWidth = "1.0";
        drawMarkers();
    }

    //画轴
    function drawAxis(x, y, X, Y) {
        cxt.beginPath();
        cxt.moveTo(x, y);
        cxt.lineTo(X, Y);
        cxt.setStrokeStyle("#cccccc");//x Axis and y Axis border color
        cxt.closePath();
        cxt.stroke();
    }

    // draw chart markers on X and Y Axis
    function drawMarkers() {
        var numMarkers = parseInt(maxValue / totLabelsOnYAxis);
        cxt.textAlign = "center";
        // Y Axis
        for (var a = 0; a <= totLabelsOnYAxis; a++) {
            var markerVal = a * numMarkers;
            var markerValHt = a * numMarkers * cHeight;
            var xMarkers = cMarginSpace - 25;//y轴数值与Y轴距离
            var yMarkers = cMarginHeight - (markerValHt / maxValue);
            cxt.setFontSize(20);
            cxt.fillText(markerVal, xMarkers, yMarkers);
        }
        // X Axis
        cxt.textAlign = 'center';
        for (var b = 0; b < totalBars; b++) {
            var arrVal = arr[b].split(",");
            var name = arrVal[0];
            var markerXPos = (cMarginSpace + bMargin)
                + (b * (bWidth + bMargin)) + (bWidth / 2) - 10;
            var markerYPos = cMarginHeight + 20;//x轴数值与x轴距离
            cxt.setFontSize(20);
            cxt.fillText(name, markerXPos, markerYPos);//x轴底部文字
        }
        cxt.save();
        // Add Y Axis title
        cxt.translate(cMargin + 10, cHeight / 2);
        cxt.rotate(Math.PI * -90 / 180);
        cxt.fillText(yCaption, 0, 0);
        cxt.restore();
        cxt.setFontSize(20);
        // Add X Axis Title
        cxt.fillText(xCaption, cMarginSpace +
        (cWidth / 4), 20);//底部文字与x轴距离
    }

    //动画
    function drawChartWithAnimation() {
        if (flag < t100) {
            flag = flag + 1;
            setTimeout(drawChartWithAnimation, speed);
        }
        var lastbX = 0;
        var lastbY = 0;

        for (var i = 0; i < totalBars; i++) {
            var arrVal = arr[i].split(",");
            var bVal = parseInt(arrVal[1]);//获取树状图数值

            var bHt = (bVal * cHeight / maxValue) / flag;//bar height
            var bX = cMarginSpace + (i * (bWidth + bMargin)) + bMargin;
            var bY = cMarginHeight - bHt - 2;//cMarginHeight=> 380
            var textY = cMarginHeight - bHt - 10;

            if (lastbX > 0)
                drawRectangle(lastbX, lastbY, bX, bY, bWidth, bHt);

            lastbX = bX;
            lastbY = bY;
            // draw(bX,bY,bWidth,maxValue-bHt);
            cxt.setFillStyle("#000000");//singer bar number color
            cxt.fillText(bVal, bX + 4, textY);//singer bar number

        }

        // Loop through the total bars and draw

    }

    function drawRectangle(lx, ly, x, y, w, h) {
        cxt.beginPath();
        cxt.moveTo(lx + w / 2, ly);
        cxt.lineTo(x + w / 2, y);
        cxt.setStrokeStyle("#0000ff");//x Axis and y Axis border color
        cxt.setLineWidth(4)
        cxt.closePath();
        cxt.stroke();
    }

    chartSet();
    drawAxisLabelMarkers();
    drawChartWithAnimation();

    wx.drawCanvas({
        canvasId: canvasId,
        actions: cxt.getActions()
    });
}

基于柱状图修改的折线图