MonoTouch/MonoDroid - 将原始触摸坐标转换为屏幕坐标
在 MonoTouch 或 MonoDroid 中将原始触摸点转换为屏幕坐标的正确方法是什么？我的代码在模拟器上运行良好，但在设备上这些点不准确。这是我到目前为止所拥有的：
private void Initialize()
{
this.Touch += TouchView_Touch;
}
void TouchView_Touch(object sender, View.TouchEventArgs e)
{
e.ReturnValue = true;
touchPoints.Add(e.Event.RawX);
touchPoints.Add(e.Event.RawY);
this.Invalidate();
}
protected override void OnDraw(Android.Graphics.Canvas canvas)
{
base.OnDraw(canvas);
canvas.DrawColor(Color.White);
Paint p = new Paint();
p.Color = Color.Black;
Matrix m = new Matrix();
canvas.GetMatrix(m);
float[] destination = touchPoints.ToArray();
Matrix inverse = new Matrix();
bool canInvert = m.Invert(inverse);
inverse.MapPoints(destination);
canvas.DrawPoints(destination, p);
}
What's the proper way to translate raw touch points to screen coordinates in MonoTouch or MonoDroid? My code works well on the emulator but the points are inaccurate on a device. Here's what I have so far:
private void Initialize()
{
this.Touch += TouchView_Touch;
}
void TouchView_Touch(object sender, View.TouchEventArgs e)
{
e.ReturnValue = true;
touchPoints.Add(e.Event.RawX);
touchPoints.Add(e.Event.RawY);
this.Invalidate();
}
protected override void OnDraw(Android.Graphics.Canvas canvas)
{
base.OnDraw(canvas);
canvas.DrawColor(Color.White);
Paint p = new Paint();
p.Color = Color.Black;
Matrix m = new Matrix();
canvas.GetMatrix(m);
float[] destination = touchPoints.ToArray();
Matrix inverse = new Matrix();
bool canInvert = m.Invert(inverse);
inverse.MapPoints(destination);
canvas.DrawPoints(destination, p);
}
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对于 MonoDroid，有几个 StackOverflow Android 问题涉及同一主题，例如：
建议使用
View.GetLocationOnScreen(int[])或View.GetLocationInWindow()。还有
它还建议使用 View.GetLocationOnScreen() 以及获取默认显示的屏幕指标。
For MonoDroid, there are several StackOverflow Android questions which address the same topic, e.g.:
which suggests using
View.GetLocationOnScreen(int[])orView.GetLocationInWindow().There is also
which also suggests using
View.GetLocationOnScreen()along with getting the screen metrics for the default display.对于 Monotouch，您可以使用 ConvertPointToView，它是所有 UIView 的一部分。它将将该点转换为您传入的视图的正确坐标。
For Monotouch you can use ConvertPointToView which is part of all UIViews. It will convert the point to the correct coordinate for the view you pass in.