用Image画X轴，要求能根据导入的数据自动变换刻度以及刻度值的大小？
X轴作为时间轴。单位值是0.01S，怎么画出来？扩大了倍数会与上面一个问题冲突。
0.01s 就是0.01秒采集一点数据描出来。而image的lineto(x,y)的x,y都是整型数据类型。如果放大倍数吧，那么X轴的刻度值（时间轴）也应该扩大倍数，就更大了。
就像chart画图格式一样。只不过，这里的X，Y轴都是自己画出来的，Y轴我设定范围是000---10000固定了的。而X轴就要根据导入的数据自动获得点数与间隔值，还要与image控件的宽度有联系。怎么做？？
lineto(x,y)　x,y你想让他变0.01吗？当然不能了

x,y是1递增，看起来已经是很密的了，可以考虑循环啊，到了10000，从头开始，也可以用颜色区别一下
导入数据的个数不同，X轴等分点也不同？？
比如：像CHART控件：
  在BOTTOMAXIS轴的MAX上输入13614.30，则出现13个等分点，间隔自动变为1000递增；
  输入1592.64，出现15个等分点，间隔变为100递增；
  输入3592.64，出现17个等分点，间隔变为200递增；

那么出现的等分点个数和间隔值是怎么得到的？？因为这个bottomaxis我要自己画出来，并根据接收的数据不同而不同。

采用IMAGE画图，而不用CHART是因为CHART画图太吃内存了。
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormResize(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
        Form1: TForm1;
        xMax,yMax: double;
        xValue,yValue: array of double;
        pCount: integer;
        mImage: TImage;

implementation

{$R *.dfm}

procedure mPaint();
var
        vxBegin,vxEnd,vyBegin,vyEnd: integer;
        mTemp: integer;
        i: integer;
        mCanvas: TCanvas;
begin
        mImage.Picture := nil;
        mCanvas := mImage.Canvas;
        mCanvas.Font.Color := clBlack;

        //定义显示区域
        vxBegin := 10;
        vxEnd := mCanvas.ClipRect.Right-20;
        vyBegin := 20;
        vyEnd := mCanvas.ClipRect.Bottom-60;
        //画坐标轴
        mCanvas.Pen.Width := 2;
        mCanvas.Pen.Color := clBlack;
        mCanvas.MoveTo(vxEnd,vyEnd);
        mCanvas.LineTo(vxBegin,vyEnd);
        mCanvas.LineTo(vxBegin,vyBegin);
        //画刻度
        mCanvas.Pen.Width := 1;
        for i:= 1 to 10 do
        begin
                mTemp := vxBegin+i*((vxEnd-vxBegin) div 10);
                mCanvas.MoveTo(mTemp,vyEnd+4);
                mCanvas.LineTo(mTemp,vyEnd-5);
                mCanvas.TextOut(mTemp-10,vyEnd+10,FloatToStr(round(xMax*i*10)/100));

                mTemp := vyEnd-i*((vyEnd-vyBegin) div 10);
                mCanvas.MoveTo(vxBegin+4,mTemp);
                mCanvas.LineTo(vxBegin-5,mTemp);
                mCanvas.TextOut(vxBegin+4,mTemp,FloatToStr(round(yMax*i*10)/100));
        end;

        //画线
        mCanvas.Font.Color := clBlue;
        mCanvas.MoveTo(Round(vxBegin+xValue[0]*(vxEnd-vxBegin)/xMax)
                ,Round(vyBegin+(yMax-yValue[0])*(vyEnd-vyBegin)/yMax));
        for i:=1 to pCount-1 do
        begin
                mCanvas.LineTo(Round(vxBegin+xValue[i]*(vxEnd-vxBegin)/xMax)
                        ,Round(vyBegin+(yMax-yValue[i])*(vyEnd-vyBegin)/yMax));

                //显示中间10等分点的坐标，方便验证图形正确与否
                if (i mod (pCount div 10))=0 then
                begin
                        mCanvas.TextOut(Round(vxBegin+xValue[i]*(vxEnd-vxBegin)/xMax)
                                ,Round(vyBegin+(yMax-yValue[i])*(vyEnd-vyBegin)/yMax)
                                ,'('+IntToStr(i) + ',' + FloatToStr(xValue[i])+','+FloatToStr(yValue[i])+')');
                        mCanvas.MoveTo(Round(vxBegin+xValue[i]*(vxEnd-vxBegin)/xMax)
                                ,Round(vyBegin+(yMax-yValue[i])*(vyEnd-vyBegin)/yMax));
                end;

                //显示最高点坐标
                if yValue[i]=yMax then
                begin
                        mCanvas.Font.Color := clRed;
                        mCanvas.TextOut(Round(vxBegin+xValue[i]*(vxEnd-vxBegin)/xMax)
                                ,Round(vyBegin+(yMax-yValue[i])*(vyEnd-vyBegin)/yMax)
                                ,'('+IntToStr(i) + ',' + FloatToStr(xValue[i])+','+FloatToStr(yValue[i])+')');
                        mCanvas.MoveTo(Round(vxBegin+xValue[i]*(vxEnd-vxBegin)/xMax)
                                ,Round(vyBegin+(yMax-yValue[i])*(vyEnd-vyBegin)/yMax));
                        mCanvas.Font.Color := clBlue;
                end;
        end;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
        i: integer;
begin
        Randomize;
        //数据生成
        pCount := Random(500);
        SetLength(xValue,pCount);
        SetLength(yValue,pCount);
        for i:=0 to pCount-1 do
        begin
                xValue[i] := i*0.01;
                yValue[i] := Random(600);
        end;

        //数据分析
        xMax := xValue[pCount-1];
        yMax := 0;
        for i:=0 to pCount-1 do
                if yValue[i]>yMax then
                        yMax := yValue[i];

        mImage := TImage.Create(Form1);
        mImage.Align := alClient;
        mImage.Parent := Form1;
        mImage.Visible := True;
end;

procedure TForm1.FormResize(Sender: TObject);
begin
        mPaint();
end;end.