C 實現座標軸及其上的點。

公司在用devexpress包，為了實現乙個類似座標的圖表，發現用devexpress比較困難，首先，其x、y軸的大小是自動的，如何設定成固定值，必須在「設計時」，而「執行時」無法更改。搞了很長一段時間都沒實現，無奈之下，自己畫乙個。實現起來還是挺難的，首先對座標值的計算，允許小於1和特別大的值，這時就需要計算x;軸或y軸應該分幾個大的刻度，每個刻度代表多少畫素。而且，這乙個大刻度又對應多少確切的數值。座標的四周允許有空白，這時又給計算座標帶來些麻煩，最終研究了半天，搞定了。如下**：

//必須傳遞的引數

float xmax = 200f; float ymax = 100f;//x軸最大值，y軸最大值

int picwidth = 410, picheight = 410;//大小

float dots = new float[3];

dots[0] = new float ;

dots[1] = new float ;

dots[2] = new float ;

pen penaxis = pens.blue;//座標軸

pen penslant = pens.green;//45度斜線

color colordot = color.red;//點

//配置引數

int top = 10, right = 10, left = 40, bottom = 40;//定義邊緣空白

int xbiglength = 6, ybiglength = 6;//大刻度線的長度

int xsmallcount = 5, ysmallcount = 5;//乙個大刻度內的小刻度個數

int xsmalllength = 3, ysmalllength = 3;//小刻度線長度

int xarrowlength = 10, yarrowlength = 10;//座標軸箭頭占用的最少座標長度

int arrowlinelength = 3;//箭頭線的長度

int dotradius = 2;//點的半徑

#region 初始化相應的類

system.drawing.bitmap bitmap = new system.drawing.bitmap(picwidth, picheight, pixelformat.format32bppargb);

system.drawing.graphics graphics = system.drawing.graphics.fromimage(bitmap);

graphics.fillrectangle(brushes.transparent, 0, 0, picwidth, picheight);

graphics.interpolationmode = system.drawing.drawing2d.interpolationmode.high;

graphics.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;

#endregion

#region 計算所需的值

int xusablelength = picwidth - left - right - xarrowlength, yusablelength = picheight - top - bottom - yarrowlength;

int xbigcount = 10, ybigcount = 10;//大刻度個數

double xrate = 1, yrate = 1;//乙個大刻度的比率，即乙個大刻度的實際數值

int xdigitlen;

if (xmax < 1)

else

int ydigitlen;

if (ymax < 1)

else

int xbigscalelen = (xusablelength / (xbigcount * xsmallcount)) * xsmallcount;//x軸方向乙個大刻度代表的畫素數

int ybigscalelen = (yusablelength / (ybigcount * ysmallcount)) * ysmallcount;//y軸方向乙個大刻度代表的畫素數

int xsmallscalelen = xbigscalelen / xsmallcount;//x軸方向乙個小刻度代表的畫素數

int ysmallscalelen = ybigscalelen / ysmallcount;//y軸方向乙個小刻度代表的畫素數

#endregion

#region 劃軸、箭頭、斜線

//x軸

graphics.drawline(penaxis, new point(left, picheight - bottom), new point(picwidth - right, picheight - bottom));

//x軸箭頭

graphics.drawline(penaxis, new point(picwidth - right, picheight - bottom), new point(picwidth - right - arrowlinelength, picheight - bottom - arrowlinelength));

graphics.drawline(penaxis, new point(picwidth - right, picheight - bottom), new point(picwidth - right - arrowlinelength, picheight - bottom + arrowlinelength));

//y軸

graphics.drawline(penaxis, new point(left, picheight - bottom), new point(left, top));

//y軸箭頭

graphics.drawline(penaxis, new point(left, top), new point(left - arrowlinelength, top + arrowlinelength));

graphics.drawline(penaxis, new point(left, top), new point(left + arrowlinelength, top + arrowlinelength));

//45%線

graphics.drawline(penslant, new point(left, picheight - bottom), new point(picwidth - right, top));

#endregion

#region 畫大刻度、小刻度

font font = new font("宋體", 9f, new fontstyle());

for (int i = 0; i <= xbigcount; i++)

for (int i = 0; i <= ybigcount; i++)

for (int i = 0; i < xbigcount * xsmallcount; i++)

for (int i = 0; i < ybigcount * ysmallcount; i++)

#endregion

//畫點

solidbrush dotbrush = new solidbrush(colordot);

foreach (float dot in dots)

C 實現座標軸及其上的點。

求座標軸上的點與點之間的距離

matlab座標軸的設定

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C 實現座標軸及其上的點。

求座標軸上的點與點之間的距離

matlab座標軸的設定

Qwt中座標軸的設定

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