关于折线图选中点更新显示

[Choice-Fei]

你好，我想通过代码来控制更新这个选中点的显示（非点击），怎么实现

[AAChartModel]

参考:

• 如何设置默认选中某一个项，而不需要点击 AAChartKit-Swift#345

OC 版本的代码:

//https://github.com/AAChartModel/AAChartKit-Swift/issues/345
+ (AAOptions *)setCrosshairAndTooltipToTheDefaultPositionAfterLoadingChart {
    AAChartModel *aaChartModel = AAChartModel.new
    .chartTypeSet(AAChartTypeAreaspline)//图表类型
    .colorsThemeSet(@[@"#04d69f",@"#1e90ff",@"#ef476f",@"#ffd066",])
    .stackingSet(AAChartStackingTypeNormal)
    .yAxisVisibleSet(false)
    .markerRadiusSet(@0)
    .seriesSet(@[
        AASeriesElement.new
        .nameSet(@"Tokyo Hot")
        .lineWidthSet(@5.0)
        .fillOpacitySet(@0.4)
        .dataSet(@[@0.45, @0.43, @0.50, @0.55, @0.58, @0.62, @0.83, @0.39, @0.56, @0.67, @0.50, @0.34, @0.50, @0.67, @0.58, @0.29, @0.46, @0.23, @0.47, @0.46, @0.38, @0.56, @0.48, @0.36]),
        AASeriesElement.new
        .nameSet(@"Berlin Hot")
        .lineWidthSet(@5.0)
        .fillOpacitySet(@0.4)
        .dataSet(@[@0.38, @0.31, @0.32, @0.32, @0.64, @0.66, @0.86, @0.47, @0.52, @0.75, @0.52, @0.56, @0.54, @0.60, @0.46, @0.63, @0.54, @0.51, @0.58, @0.64, @0.60, @0.45, @0.36, @0.67]),
        AASeriesElement.new
        .nameSet(@"London Hot")
        .lineWidthSet(@5.0)
        .fillOpacitySet(@0.4)
        .dataSet(@[@0.46, @0.32, @0.53, @0.58, @0.86, @0.68, @0.85, @0.73, @0.69, @0.71, @0.91, @0.74, @0.60, @0.50, @0.39, @0.67, @0.55, @0.49, @0.65, @0.45, @0.64, @0.47, @0.63, @0.64]),
        AASeriesElement.new
        .nameSet(@"NewYork Hot")
        .lineWidthSet(@5.0)
        .fillOpacitySet(@0.4)
        .dataSet(@[@0.60, @0.51, @0.52, @0.53, @0.64, @0.84, @0.65, @0.68, @0.63, @0.47, @0.72, @0.60, @0.65, @0.74, @0.66, @0.65, @0.71, @0.59, @0.65, @0.77, @0.52, @0.53, @0.58, @0.53]),
    ]);
    
    AAOptions *aaOptions = aaChartModel.aa_toAAOptions;
    
    aaOptions.tooltip
        .styleSet(AAStyleColor(AAColor.whiteColor))
        .backgroundColorSet(@"#050505")
        .borderColorSet(@"#050505");
    
    aaOptions.xAxis
        .crosshairSet(AACrosshair.new
            .colorSet(AAColor.darkGrayColor)
            .dashStyleSet(AAChartLineDashStyleTypeLongDashDotDot)
            .widthSet(@2));
    
    //默认选中的位置索引
    NSUInteger defaultSelectedIndex = 5;
    
    //https://api.highcharts.com/highcharts/chart.events.load
    //https://www.highcharts.com/forum/viewtopic.php?t=36508
    aaOptions.chart
        .eventsSet(AAChartEvents.new
            .loadSet([NSString stringWithFormat:@AAJSFunc(function() {
                const points = [];
                const chart = this;
                const series = chart.series;
                const length = series.length;
                           
                for (let i = 0; i < length; i++) {
                    const pointElement = series[i].data[%ld];
                    pointElement.onMouseOver();
                    points.push(pointElement);
                }
                chart.xAxis[0].drawCrosshair(null, points[0]);
                chart.tooltip.refresh(points);
                       }), defaultSelectedIndex]));
    
    
    return aaOptions;
}

你可以在 demo 中找到这段代码.

[AAChartModel]

参考 demo 中的这段图表示例代码:

+ (AAOptions *)autoCrosshairAndTooltip {
    return AAOptions.new
        .titleSet(AATitle.new
            .textSet(@"Auto Crosshair And Tooltip"))
        .chartSet(AAChart.new
            .typeSet(AAChartTypeAreaspline)
            .eventsSet(AAChartEvents.new
                .loadSet(@AAJSFunc(function() {
                    const chart = this;
                    let currentIndex = 0;
                    let intervalId;
                    let isTouched = false;

                    function moveTooltip() {
                        const pointsToShow = [];
                        for (let i = 0; i < chart.series.length; i++) {
                            const point = chart.series[i].points[currentIndex];
                            if (point) {
                                pointsToShow.push(point);
                            }
                        }

                        if (pointsToShow.length > 0) {
                            chart.tooltip.refresh(pointsToShow);
                            chart.xAxis[0].drawCrosshair(null, pointsToShow[0]);

                            currentIndex = (currentIndex + 1) % chart.series[0].points.length;
                        }
                    }

                    function startInterval() {
                        if (intervalId) {
                            clearInterval(intervalId);
                        }
                        intervalId = setInterval(moveTooltip, 2000); // 每2秒切换一次
                    }

                    // 立即显示第一个点的 tooltip 和十字线
                    moveTooltip();

                    // 初始启动 interval
                    startInterval();

                    // 触摸开始
                    chart.container.ontouchstart = function(e) {
                        isTouched = true;
                        if (intervalId) {
                            clearInterval(intervalId);
                            intervalId = null;
                        }
                        handleTouch(e);
                    };

                    // 触摸移动
                    chart.container.ontouchmove = function(e) {
                        if (isTouched) {
                            handleTouch(e);
                        }
                    };

                    function handleTouch(e) {
                        e.preventDefault(); // 阻止默认的滚动行为
                        const touch = e.touches[0];
                        const event = chart.pointer.normalize(touch);
                        const point = chart.series[0].searchPoint(event, true);
                        if (point) {
                            currentIndex = chart.series[0].points.indexOf(point);
                            const pointsToShow = [];
                            for (let i = 0; i < chart.series.length; i++) {
                                const pointInSeries = chart.series[i].points[currentIndex];
                                if (pointInSeries) {
                                    pointsToShow.push(pointInSeries);
                                }
                            }
                            chart.tooltip.refresh(pointsToShow);
                            chart.xAxis[0].drawCrosshair(event, point);
                        }
                    }

                    // 触摸结束
                    chart.container.ontouchend = function() {
                        isTouched = false;
                        if (!intervalId) {
                            // 立即移动到下一个点，然后开始 interval
                            moveTooltip();
                            startInterval();
                        }
                    };

                    // 在图表销毁时清除 interval
                    this.callbacks.push(function() {
                        if (intervalId) {
                            clearInterval(intervalId);
                        }
                    });
                }))))
        .colorsSet(@[@"#04d69f", @"#1e90ff", @"#ef476f", @"#ffd066"])
        .plotOptionsSet(AAPlotOptions.new
            .seriesSet(AASeries.new
                .stackingSet(AAChartStackingTypeNormal)
                .markerSet(AAMarker.new
                    .radiusSet(@0))))
        .tooltipSet(AATooltip.new
            .styleSet(AAStyleColor(AAColor.whiteColor))
            .backgroundColorSet(@"#050505")
            .borderColorSet(@"#050505"))
        .xAxisSet(AAXAxis.new
            .crosshairSet(AACrosshair.new
                .colorSet(AAColor.darkGrayColor)
                .dashStyleSet(AAChartLineDashStyleTypeLongDashDotDot)
                .widthSet(@2)))
        .yAxisSet(AAYAxis.new
            .visibleSet(false))
        .seriesSet(@[
            AASeriesElement.new
                .nameSet(@"Tokyo Hot")
                .lineWidthSet(@5.0)
                .fillOpacitySet(@0.4)
                .dataSet(@[@0.45, @0.43, @0.50, @0.55, @0.58, @0.62, @0.83, @0.39, @0.56, @0.67, @0.50, @0.34, @0.50, @0.67, @0.58, @0.29, @0.46, @0.23, @0.47, @0.46, @0.38, @0.56, @0.48, @0.36]),
            AASeriesElement.new
                .nameSet(@"Berlin Hot")
                .lineWidthSet(@5.0)
                .fillOpacitySet(@0.4)
                .dataSet(@[@0.38, @0.31, @0.32, @0.32, @0.64, @0.66, @0.86, @0.47, @0.52, @0.75, @0.52, @0.56, @0.54, @0.60, @0.46, @0.63, @0.54, @0.51, @0.58, @0.64, @0.60, @0.45, @0.36, @0.67]),
            AASeriesElement.new
                .nameSet(@"London Hot")
                .lineWidthSet(@5.0)
                .fillOpacitySet(@0.4)
                .dataSet(@[@0.46, @0.32, @0.53, @0.58, @0.86, @0.68, @0.85, @0.73, @0.69, @0.71, @0.91, @0.74, @0.60, @0.50, @0.39, @0.67, @0.55, @0.49, @0.65, @0.45, @0.64, @0.47, @0.63, @0.64]),
            AASeriesElement.new
                .nameSet(@"NewYork Hot")
                .lineWidthSet(@5.0)
                .fillOpacitySet(@0.4)
                .dataSet(@[@0.60, @0.51, @0.52, @0.53, @0.64, @0.84, @0.65, @0.68, @0.63, @0.47, @0.72, @0.60, @0.65, @0.74, @0.66, @0.65, @0.71, @0.59, @0.65, @0.77, @0.52, @0.53, @0.58, @0.53]),
        ]);
}

[Choice-Fei]

默认项的话我看懂了，动态更新的话，就需要重新设置event然后调用aa_refreshChartWithOptions这个方法来实现？

[AAChartModel]

默认项的话我看懂了，动态更新的话，就需要重新设置event然后调用aa_refreshChartWithOptions这个方法来实现？

只是更新局部内容的话, 调用这个全局刷新的方法 aa_refreshChartWithOptions, 效率太低了.

可以参考 demo 中的下面这段代码:

- (void)setupChartViewHandler {
    __weak typeof(self) weakSelf = self;
    [_aaChartView1 moveOverEventHandler:^(AAChartView *aaChartView,
                                          AAMoveOverEventMessageModel *message) {
        //默认选中的位置索引
        NSUInteger defaultSelectedIndex = message.index;
        
        //https://api.highcharts.com/highcharts/chart.events.load
        //https://www.highcharts.com/forum/viewtopic.php?t=36508
       NSString *jsFunc = ([NSString stringWithFormat:@AAJSFunc((
    function syncRefreshTooltip() {
           const points = [];
           const chart = aaGlobalChart;
           const series = chart.series;
           const length = series.length;
                      
           for (let i = 0; i < length; i++) {
               const pointElement = series[i].data[%ld];
               pointElement.onMouseOver();
               points.push(pointElement);
           }
           chart.xAxis[0].drawCrosshair(null, points[0]);
           chart.tooltip.refresh(points);
    }
    syncRefreshTooltip();
        )), defaultSelectedIndex]);
        
        
        
        [weakSelf.aaChartView2 aa_evaluateJavaScriptStringFunction:jsFunc];
    }];
}

重点是这一句[weakSelf.aaChartView2 aa_evaluateJavaScriptStringFunction:jsFunc];.

直接执行这一小段 js 代码即可. 这样能做到只是局部刷新, 也就避免了低效的全局刷新.