【发布时间】：2012-07-17 00:00:22
【问题描述】：
我正在使用 C# 3.0 使用 .Net Compact Framework 3.5 开发一个项目。
我有一个用户控件，它每 15 毫秒接收一次数据，我必须绘制形状
像线条、矩形、用户控件上的填充矩形。
我想知道绘制这些形状的最快方法是什么，如果有一些提高性能和速度的方法，我也愿意使用 P/Invoke 方法。
我使用的代码如下：
private void DrawThreeFunctions(Graphics g)
{
// drawing back functions
if (DisplayFunction1.DrawOrder == DrawOrder.Back && GraphDataArray.Length > 0)
{
DrawFunction(g, DisplayFunction1, GraphDataArray[0]);
}
if (DisplayFunction2.DrawOrder == DrawOrder.Back && GraphDataArray.Length > 1)
{
DrawFunction(g, DisplayFunction2, GraphDataArray[1]);
}
if (DisplayFunction3.DrawOrder == DrawOrder.Back && GraphDataArray.Length > 2)
{
DrawFunction(g, DisplayFunction3, GraphDataArray[2]);
}
// drawing middle functions
if (DisplayFunction1.DrawOrder == DrawOrder.Middle && GraphDataArray.Length > 0)
{
DrawFunction(g, DisplayFunction1, GraphDataArray[0]);
}
if (DisplayFunction2.DrawOrder == DrawOrder.Middle && GraphDataArray.Length > 1)
{
DrawFunction(g, DisplayFunction2, GraphDataArray[1]);
}
if (DisplayFunction3.DrawOrder == DrawOrder.Middle && GraphDataArray.Length > 2)
{
DrawFunction(g, DisplayFunction3, GraphDataArray[2]);
}
// drawing front functions
if (DisplayFunction1.DrawOrder == DrawOrder.Front && GraphDataArray.Length > 0)
{
DrawFunction(g, DisplayFunction1, GraphDataArray[0]);
}
if (DisplayFunction2.DrawOrder == DrawOrder.Front && GraphDataArray.Length > 1)
{
DrawFunction(g, DisplayFunction2, GraphDataArray[1]);
}
if (DisplayFunction3.DrawOrder == DrawOrder.Front && GraphDataArray.Length > 2)
{
DrawFunction(g, DisplayFunction3, GraphDataArray[2]);
}
}
private void DrawFunction(Graphics g, DisplayFunction function, int[] data)
{
Color color = Utils.GetColor(function.Color);
switch (function.Shape)
{
case FunctionShape.StepLine:
DrawStepLines(g, data, color);
break;
case FunctionShape.Rectangle:
DrawFilledRectangles(g, data, color);
break;
case FunctionShape.FramedRectangle:
DrawFramedRectangles(g, data, color);
break;
case FunctionShape.Line:
DrawLines(g, data, color);
break;
default:
break;
}
}
#region Drawing methods
// drawing lines
private void DrawLines(Graphics g, int[] lineData, Color lineColor)
{
BarPositions = new List<int>();
List<Point> linePoints = new List<Point>();
int lineYPos = -1;
int lineXPos = FirstBarDrawPosition;
Point point = Point.Empty;
using (Pen linePen = new Pen(lineColor, 2.0f))
{
for (int i = FirstVisibleItemIndex, k = 0; i < _indexLimit; i++, k++)
{
if (base.GetBarEndPosition(k) > Width)
break;
lineXPos = GetTickPosition(k);
BarPositions.Add(lineXPos);
if (i < lineData.Length)
lineYPos = lineData[i];
else
continue;
point.X = lineXPos;
point.Y = lineYPos;
linePoints.Add(point);
}
if (linePoints.Any())
{
g.DrawLines(linePen, linePoints.ToArray());
}
}
}
// drawing framed rectangles
private void DrawFramedRectangles(Graphics g, int[] functionValues, Color functionColor)
{
BarPositions = new List<int>();
int barXPos = FirstBarDrawPosition;
Rectangle barRect = Rectangle.Empty;
barRect.Width = WidthOfBar - 1;
int barYPos = -1;
using (Pen barPen = new Pen(functionColor))
{
for (int i = FirstVisibleItemIndex, k = 0; i < _indexLimit; i++, k++)
{
if (base.GetBarEndPosition(k) > Width)
return;
BarPositions.Add(GetTickPosition(k));
if (i < functionValues.Length)
barYPos = functionValues[i];
else
continue;
//barRect = new Rectangle();
barRect.X = barXPos;
barRect.Y = barYPos;
//barRect.Width = WidthOfBar - 1;
barRect.Height = Height - barYPos;
g.DrawRectangle(barPen, barRect);
barXPos += (WidthOfBar + DistanceBetweenBars);
}
}
}
// drawing filled rectangles
private void DrawFilledRectangles(Graphics g, int[] functionValues, Color functionColor)
{
BarPositions = new List<int>();
int barXPos = FirstBarDrawPosition;
Rectangle barRect = Rectangle.Empty;
barRect.Width = WidthOfBar;
int barYPos = -1;
using (SolidBrush barBrush = new SolidBrush(functionColor))
{
for (int i = FirstVisibleItemIndex, k = 0; i < _indexLimit; i++, k++)
{
if (base.GetBarEndPosition(k) > Width)
return;
BarPositions.Add(GetTickPosition(k));
if (i < functionValues.Length)
barYPos = functionValues[i];
else
continue;
//barRect = new Rectangle();
barRect.X = barXPos;
barRect.Y = barYPos;
//barRect.Width = WidthOfBar;
barRect.Height = Height - barYPos;
g.FillRectangle(barBrush, barRect);
barXPos += (WidthOfBar + DistanceBetweenBars);
}
}
}
private void DrawStepLines(Graphics g, int[] lineData, Color lineColor)
{
BarPositions = new List<int>();
int lineYPos = -1;
int barXPos = FirstBarDrawPosition;
using (Pen linePen = new Pen(lineColor, 2.0f))
{
for (int i = FirstVisibleItemIndex, k = 0; i < _indexLimit; i++, k++)
{
if (base.GetBarEndPosition(k) > Width)
return;
BarPositions.Add(GetTickPosition(k));
if (i < lineData.Length)
lineYPos = lineData[i];
else
continue;
// draw third function line
//lineHeight = lineData[i];
g.DrawLine(linePen, barXPos, lineYPos, barXPos + WidthOfBar - 1, lineYPos);
barXPos += (WidthOfBar + DistanceBetweenBars);
}
}
}
我正在使用绘制顺序和形状，如阶梯线、线条、框架矩形（只是矩形），矩形是填充矩形。
由于对性能至关重要的应用程序，我想知道绘制这些形状的最快方法。
提前感谢您的任何建议。
【问题讨论】：
-
你检查过标准函数太慢了吗？我认为他们应该能够提供至少大约 10fps 的体面动画。这足以满足任何人类的需求，因为无论如何人类至少需要一秒钟的时间来做出反应。更快的速度可能会使动画更流畅，但不会增加任何真正的价值——只是养眼。
-
对于动力不足/移动设备而言，Flash 可能是您的最佳选择。
-
@Vilx-: 15ms 进入 1 秒大约 67 次。
-
@leppie - 是的，我是说这么快地重绘是没有意义的。
-
你应该尽量找到一些优化策略，避免每次都重绘。
标签： c# compact-framework .net-cf-3.5