如何删除 ChartView 中的间距? [英] How to remove spacing in ChartView?

问题描述

有人知道如何去掉这个间距吗?

Does anyone know how to remove this spacing?

下面的那些行减少了它们，但没有完全删除.

Those lines below reduce them but not completely remove.

margins.top: 0
margins.bottom: 0
margins.left: 0
margins.right: 0

更新我添加了一些代码.可能这有助于确定我的问题.最初箭头所在的那些空白区域用于图例和刻度值.我想不改变源代码我什么都做不了.

UPDATE I added some code. May be this could help to identify my problem. Originally those blank spaces where arrows are located are for legend and tick values. I quess without changing a source code I can do nothing.

ScopeView.qml

import QtQuick 2.0
import QtCharts 2.1

ChartView {
    id: chartView

    animationOptions: ChartView.NoAnimation
    theme: ChartView.ChartThemeQt
    legend.visible: false

    margins.top: 0
    margins.bottom: 0
    margins.left: 0
    margins.right: 0

    backgroundRoundness: 0

    property bool openGL: true
    onOpenGLChanged: {
        series("signal 1").useOpenGL = openGL;
    }

    ValueAxis {
        id: axisY1
        min: -1
        max: 4
        labelsVisible: false
        tickCount: 3

        color: "transparent"
    }

    ValueAxis {
        id: axisX
        min: 0
        max: 1024

        labelsVisible: false
        tickCount: 4

        color: "transparent"
    }

    LineSeries {
        id: lineSeries1
        name: "signal 1"
        axisX: axisX
        axisY: axisY1
        useOpenGL: chartView.openGL
        color: "#44D77B"
    }

    Timer {
        id: refreshTimer
        interval: 1 / 60 * 1000 // 60 Hz
        running: true
        repeat: true
        onTriggered: {
            dataSource.update(chartView.series(0));
        }
    }

    function changeSeriesType(type) {
        chartView.removeAllSeries();

        // Create two new series of the correct type. Axis x is the same for both of the series,
        // but the series have their own y-axes to make it possible to control the y-offset
        // of the "signal sources".
        if (type == "line") {
            var series1 = chartView.createSeries(ChartView.SeriesTypeLine, "signal 1",
                                                 axisX, axisY1);
            series1.useOpenGL = chartView.openGL
        } else {
            var series1 = chartView.createSeries(ChartView.SeriesTypeScatter, "signal 1",
                                                 axisX, axisY1);
            series1.markerSize = 2;
            series1.borderColor = "transparent";
            series1.useOpenGL = chartView.openGL
        }
    }

    function createAxis(min, max) {
        // The following creates a ValueAxis object that can be then set as a x or y axis for a series
        return Qt.createQmlObject("import QtQuick 2.0; import QtCharts 2.0; ValueAxis { min: "
                                  + min + "; max: " + max + " }", chartView);
    }

    function setAnimations(enabled) {
        if (enabled)
            chartView.animationOptions = ChartView.SeriesAnimations;
        else
            chartView.animationOptions = ChartView.NoAnimation;
    }

    function changeRefreshRate(rate) {
        refreshTimer.interval = 1 / Number(rate) * 1000;
    }
}

更新 II

诀窍是使用 clip 并将 chartView 放入 一个矩形中.

The trick was to use clip and put the chartView into a rectangle.

Rectangle {
    id: canvas
    anchors{
        left: parent.left
        right: parent.right
        top: parent.top
    }
    height: 250
    color: "#FFFFFF"
    z: propText.z - 1

    clip: true

    Rectangle {
        width: parent.width
        height: 40

        z: 1

        color: "#FFFFFF"
    }

    GraphView{ //ChartView
        id: graphView
        isTimerRunnig: isRunning
        channelId: channelId
    }
}

和 ChartView aka GraphView

ChartView {
id: chartView

property alias channelId: dataSource.channelId
property alias isTimerRunnig: refreshTimer.running
property bool openGL: true

antialiasing: !openGL
legend.visible: false

margins.top: 0
margins.bottom: 0
margins.left: 0
margins.right: 0

x: -70
y: 20

width: 360
height: 262

backgroundRoundness: 0


onOpenGLChanged: {
    series("signal 1").useOpenGL = openGL;
}

DataSource {
    id: dataSource
    channelId: channelId
    isPaused: !isTimerRunnig

    onIsPausedChanged: {
        if(isPaused){
            lineSeries1.clear()
        }
    }
}

ValueAxis {
    id: axisY

    //gridVisible: false
    labelsVisible: false
    tickCount: 3

    color: "transparent"
}

ValueAxis {
    id: axisX
    min: 0
    max: 100

    //gridVisible: false
    labelsVisible: false
    tickCount: 4

    color: "transparent"
}

LineSeries {
    id: lineSeries1
    name: "signal 1"
    axisX: axisX
    axisY: axisY
    useOpenGL: chartView.openGL
    color: "#44D77B"
    width: 2
}

Timer {
    id: refreshTimer
    interval: 1 / 25 * 1000 // 25 Hz
    running: isTimerRunnig
    repeat: true
    onTriggered: {
        dataSource.updateFromQML(chartView.series(0), chartView.axisY(chartView.series(0)))
        //dataSource.printChannelId()
    }
}

推荐答案

可能的解决方案一:QMargins 属性指定绘图区域周围的最小区域.尝试通过调整孩子(情节)本身来填充剩余的填充.

Possible solution 1: QMargins property designates the minimum area around the plotting area. Try filling this remaining padding by adjusting the child (plot) itself.

plotArea : rect ChartView 上用于绘图的区域系列.这是没有边距的 ChartView rect.

plotArea : rect The area on the ChartView that is used for drawing series. This is the ChartView rect without the margins.

可能的解决方案2:设置边距后尝试重绘父布局.如果在创建窗口后调整边距，不一定会立即刷新视图.

Possible solution 2: Try to redraw the parent layout after setting the margins. If you are adjusting the margins after the window is created, it may not necessarily refresh the view immediately.

这篇关于如何删除 ChartView 中的间距?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！