[英]MSCharts custom panning
我正在嘗試在MSCharts(Microsoft圖表控件)中創建自己的自定義平移功能。 我意識到有一個用於縮放和平移的擴展,但是它沒有我想要的很多功能。 這是我目前擁有的平移功能:
//handles mouse panning, will pan while mouse left click if held down..
private int prevx = 0;
private int prevy = 0;
private void Mouse_Up(object sender, MouseEventArgs e)
{
//reset previous x and y on mouse click up
if (e.Button == MouseButtons.Left)
{
prevx = 0;
prevy = 0;
}
}
private void Mouse_Move(object sender, MouseEventArgs e, Chart chart)
{
//if mouse was moved and mouse left click
if (e.Button == MouseButtons.Left)
{
//a scalar, not entirely sure how useful it is, only works for my viewport
double incr = 0.00130;
if (prevx != 0 && prevy != 0)
{
//find x and y difference in mouse movement
int diffx = e.X - prevx;
int diffy = e.Y - prevy;
//how much to increment x and y
double incrx = incr * Math.Abs(diffx);
double incry = incr * Math.Abs(diffy);
//get chart mins and maxs for both axes
double minX = chart.ChartAreas[0].AxisX.Minimum;
double maxX = chart.ChartAreas[0].AxisX.Maximum;
double minY = chart.ChartAreas[0].AxisY.Minimum;
double maxY = chart.ChartAreas[0].AxisY.Maximum;
if (diffx > 0 && diffy > 0)
{
chart.ChartAreas[0].AxisX.Minimum -= (maxX - minX) * incrx;
chart.ChartAreas[0].AxisX.Maximum -= (maxX - minX) * incrx;
chart.ChartAreas[0].AxisY.Minimum += (maxY - minY) * incry;
chart.ChartAreas[0].AxisY.Maximum += (maxY - minY) * incry;
//Console.WriteLine("upleft");
}
else if (diffx < 0 && diffy > 0)
{
chart.ChartAreas[0].AxisX.Minimum += (maxX - minX) * incrx;
chart.ChartAreas[0].AxisX.Maximum += (maxX - minX) * incrx;
chart.ChartAreas[0].AxisY.Minimum += (maxY - minY) * incry;
chart.ChartAreas[0].AxisY.Maximum += (maxY - minY) * incry;
//Console.WriteLine("upright");
}
else if (diffx > 0 && diffy < 0)
{
chart.ChartAreas[0].AxisX.Minimum -= (maxX - minX) * incrx;
chart.ChartAreas[0].AxisX.Maximum -= (maxX - minX) * incrx;
chart.ChartAreas[0].AxisY.Minimum -= (maxY - minY) * incry;
chart.ChartAreas[0].AxisY.Maximum -= (maxY - minY) * incry;
//Console.WriteLine("bottom left");
}
else if (diffx < 0 && diffy < 0)
{
chart.ChartAreas[0].AxisX.Minimum += (maxX - minX) * incrx;
chart.ChartAreas[0].AxisX.Maximum += (maxX - minX) * incrx;
chart.ChartAreas[0].AxisY.Minimum -= (maxY - minY) * incry;
chart.ChartAreas[0].AxisY.Maximum -= (maxY - minY) * incry;
//Console.WriteLine("bottomright");
}
else if (diffx > 0 && diffy == 0)
{
chart.ChartAreas[0].AxisX.Minimum -= (maxX - minX) * incrx;
chart.ChartAreas[0].AxisX.Maximum -= (maxX - minX) * incrx;
//Console.WriteLine("right");
}
else if (diffx < 0 && diffy == 0)
{
chart.ChartAreas[0].AxisX.Minimum += (maxX - minX) * incrx;
chart.ChartAreas[0].AxisX.Maximum += (maxX - minX) * incrx;
//Console.WriteLine("left");
}
else if (diffy > 0 && diffx == 0)
{
chart.ChartAreas[0].AxisY.Minimum += (maxY - minY) * incry;
chart.ChartAreas[0].AxisY.Maximum += (maxY - minY) * incry;
//Console.WriteLine("down");
}
else if (diffy < 0 && diffx == 0)
{
chart.ChartAreas[0].AxisY.Minimum -= (maxY - minY) * incry;
chart.ChartAreas[0].AxisY.Maximum -= (maxY - minY) * incry;
//Console.WriteLine("up");
}
}
prevx = e.X;
prevy = e.Y;
}
}
我注意到有一個類似的問題,盡管它是JavaFX中的,但我沒有經驗。我設想的平移功能應該能夠隨圖形移動鼠標。 因此,如果我單擊某個點並向左拖動50像素,則該點仍將直接位於我的鼠標下方。 在我當前的視口中,這可行。 但是,如果我將圖表縮小或放大,則將無法正常工作。 當圖形變小時,圖形的移動速度比鼠標慢;當圖形變大時,圖形的移動速度比鼠標快。
我知道我應該以某種方式將視口或統計圖寬度包括在計算中,但是我真的不知道如何。 你們中有人有經驗嗎? 謝謝。
您很懷疑使用“標量”方法從像素中計算出一個因子的值是正確的。 這將永遠無法工作,原因不只一種。
但是無論如何,正確的解決方案要簡單得多。 它利用軸轉換功能之一在數據值和像素位置之間轉換。 (順便說一下,還有一個可以轉換成百分比位置的單位。)
我存儲初始位置以避免在鼠標移動過程中出現舍入錯誤:
private double prevXMax = 0;
private double prevXMin = 0;
private double prevYMax = 0;
private double prevYMin = 0;
private Point mDown = Point.Empty;
現在我們需要的是Mousedown
:
private void chart_MouseDown(object sender, MouseEventArgs e)
{
//store previous data
if (e.Button == MouseButtons.Left)
{
mDown = e.Location;
prevXMax = chart.ChartAreas[0].AxisX.Maximum;
prevXMin = chart.ChartAreas[0].AxisX.Minimum;
prevYMax = chart.ChartAreas[0].AxisY.Maximum;
prevYMin = chart.ChartAreas[0].AxisY.Minimum;
}
}
還有更簡單的MouseMove
:
private void chart_MouseMove(object sender, MouseEventArgs e)
{
Axis ax = chart.ChartAreas[0].AxisX;
Axis ay = chart.ChartAreas[0].AxisY;
//if mouse was moved and mouse left click
if (e.Button == MouseButtons.Left)
{
double x0 = ax.PixelPositionToValue(mDown.X);
double x1 = ax.PixelPositionToValue(e.X);
double y0 = ay.PixelPositionToValue(mDown.Y);
double y1 = ay.PixelPositionToValue(e.Y);
ax.Minimum = prevXMin + (x0 - x1);
ax.Maximum = prevXMax + (x0 - x1);
ay.Minimum = prevYMin + (y0 - y1);
ay.Maximum = prevYMax + (y0 - y1);
}
}
縮放計算的問題之一是您可能需要調整圖表的大小。 之后,秤將不再起作用。 另一個是您必須除去ChartArea
和InnerPlotPosition
之外的InnerPlotPosition
,即Axis.Labels
, Titles
和Legend
因為它們占用的空間不應縮放。
請注意,軸功能僅在Paintxxx
或Mousexxx
事件期間有效。
結果如下:
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