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Garp
Asked:2024-04-12 15:24:52 +0000 UTC2024-04-12 15:24:52 +0000 UTC

PyQt如何在放大时看到图形超出可见区域边缘的部分？

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放大时，图像（图形）的一部分会超出可见区域的边缘。理论上，您可以通过移动滚动滑块（滚动）（2）通过移动箭头来看到这个消失的部分（1）（3）在线地图具有拖放功能，但这不是我们的情况。

由于某些原因（没有鼠标，只有键盘），需要使用“用箭头移动图形”的方法。如何实施？

此外，图表的起始图像必须完全适合屏幕。

from PySide6.QtWidgets import QWidget, QApplication, QHBoxLayout, QScrollArea, QVBoxLayout
from PySide6.QtCharts import QChart, QChartView, QLineSeries, QValueAxis
from PySide6.QtCore import QPointF
from PySide6.QtGui import QPainter, Qt
import math
import sys


class Charts(QWidget):
    def __init__(self, parent=None):
        super(Charts, self).__init__(parent)
        self.zoomFactor = 1.1
        self.zoom_value = 0
        self.chart = QChart()
        self.series1 = QLineSeries()
        for i in range(0,2500,1):
            self.series1.append([QPointF(i, math.sin(i * 0.01))])
        self.chart.addSeries(self.series1)
        y_axis = QValueAxis()
        y_axis.setRange(-1, 1)
        y_axis.setTickType(QValueAxis.TickType.TicksDynamic)
        y_axis.setTickInterval(20)
        x_axis = QValueAxis()
        x_axis.setRange(1, 2500)
        x_axis.setTickInterval(100)
        x_axis.setTickType(QValueAxis.TickType.TicksDynamic)
        self.chart.addAxis(x_axis, Qt.AlignmentFlag.AlignBottom)
        self.chart.addAxis(y_axis, Qt.AlignmentFlag.AlignLeft)
        self.chart.legend().hide()
        self.chart.createDefaultAxes()
        self.chartview = QChartView(self.chart)
        self.chartview.setRenderHint(QPainter.Antialiasing)
        vbox = QVBoxLayout()
        vbox.addWidget(self.chartview)
        self.setLayout(vbox)

    def keyPressEvent(self, keyEvent):
        key = keyEvent.key()
        if key == Qt.Key_W and self.zoom_value < 10:
            self.chartview.chart().zoom(self.zoomFactor)
            self.zoom_value = self.zoom_value + 1
        elif key == Qt.Key_S and self.zoom_value > 0:
            self.chartview.chart().zoom(1 / self.zoomFactor)
            self.zoom_value = self.zoom_value - 1


if __name__ == '__main__':
    app = QApplication(sys.argv)
    charts = Charts()
    charts.show()
    sys.exit(app.exec())
python

1 个回答

  1. Best Answer

    仅增加一个轴；添加第二个轴很容易。另外，我们没有使用zoom()，这提供了更多的可能性。

    from PySide6.QtWidgets import *
from PySide6.QtGui import *
from PySide6.QtCore import *
from PySide6.QtCharts import *
import math
import sys



class Charts(QWidget):
    def __init__(self, parent=None):
        super(Charts, self).__init__(parent)
        self.chart = QChart()
        self.series = QLineSeries()
        self.x_start = 0
        self.x_stop = 100
        self.zoomFactor = self.x_stop / 20
        self.zoom_value = 0
        for i in range(self.x_start, self.x_stop, 1):
            self.series.append([QPointF(i, math.cos(i * 0.1))])
        self.chart.addSeries(self.series)
        self.y_axis = QValueAxis()
        self.y_axis.setRange(-1, 1)
        self.y_axis.setTickType(QValueAxis.TickType.TicksDynamic)
        self.y_axis.setTickInterval(5)
        self.x_axis = QValueAxis()
        self.x_axis.setRange(self.x_start, self.x_stop)
        self.x_axis.setTickInterval(5)
        self.x_axis.setTickType(QValueAxis.TickType.TicksDynamic)
        self.chart.addAxis(self.x_axis, Qt.AlignmentFlag.AlignBottom)
        self.chart.addAxis(self.y_axis, Qt.AlignmentFlag.AlignLeft)
        self.series.attachAxis(self.x_axis)
        self.series.attachAxis(self.y_axis)
        self.chart.legend().hide()
        self.chartview = QChartView(self.chart)
        self.chartview.setRenderHint(QPainter.Antialiasing)
        vbox = QVBoxLayout()
        vbox.addWidget(self.chartview)
        self.setLayout(vbox)

    def keyPressEvent(self, keyEvent):
        key = keyEvent.key()
        if key == Qt.Key_W and self.zoom_value < 10:
            self.x_start = self.x_start + self.zoomFactor
            self.x_stop = self.x_stop - self.zoomFactor
            self.x_axis.setRange(self.x_start, self.x_stop)
            self.zoom_value = self.zoom_value + 1
        elif key == Qt.Key_S and self.zoom_value > 0:
            self.x_start = self.x_start - self.zoomFactor
            self.x_stop = self.x_stop + self.zoomFactor
            self.x_axis.setRange(self.x_start, self.x_stop)
            self.zoom_value = self.zoom_value - 1
        elif key == Qt.Key_A and self.zoom_value > 0:          # to left
            self.x_start = self.x_start - self.zoomFactor
            self.x_stop = self.x_stop - self.zoomFactor
            self.x_axis.setRange(self.x_start, self.x_stop)
        if key == Qt.Key_D and self.zoom_value < 10:           # to right
            self.x_start = self.x_start + self.zoomFactor
            self.x_stop = self.x_stop + self.zoomFactor
            self.x_axis.setRange(self.x_start, self.x_stop)



if __name__ == '__main__':
    app = QApplication(sys.argv)
    charts = Charts()
    charts.show()
    sys.exit(app.exec())
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