MQL5變色線畫法（比MQL4更簡(jiǎn)單）

作者：MT4 來源：cxh99.com 發(fā)布時(shí)間：2012年05月28日

MQL5里有一種特殊指標(biāo)數(shù)組“顏色數(shù)組”，他是和畫線的指標(biāo)數(shù)組配合使用的。通過對(duì)他的簡(jiǎn)單賦值可以使畫出的線變色。
首先要在指標(biāo)頭部定義里指定一條線對(duì)應(yīng)的數(shù)組是要使用變色畫線方式，指定方法是：
#property indicator_typeX DRAW_COLOR_LINE
這里X代表畫線的數(shù)組序號(hào)
DRAW_COLOR_LINE代表畫線，此外還可以有如下畫線方式：
復(fù)制代碼
2. DRAW_COLOR_LINE
3. Colorful Line彩色線
4. DRAW_COLOR_SECTION
5. Multicolored section彩色塊
6. DRAW_COLOR_HISTOGRAM
7. Multicolored histogram from the zero line彩色柱狀圖
8. DRAW_COLOR_HISTOGRAM2
9. Multicolored histogram of the two indicator buffers彩色柱狀圖2
10. DRAW_COLOR_ARROW
11. Drawing colored arrows彩色箭頭
12. DRAW_COLOR_ZIGZAG
13. Colorful ZigZag彩色ZigZag
14. DRAW_COLOR_BARS
15. Multi-colored bars彩色竹線圖
16. DRAW_COLOR_CANDLES
17. Multi-colored candles彩色蠟燭圖
然后緊跟一個(gè)顏色的定義語句：
#property indicator_colorX Red,Green
兩個(gè)顏色之間用逗號(hào)分隔
============================================
針對(duì)上面程序頭部的定義，之后要開始全局?jǐn)?shù)組的定義。
這里要注意實(shí)現(xiàn)變色需要針對(duì)一條線使用兩個(gè)數(shù)組，
例如：
double bMaBuffer[],bColorBuffer[];
然后進(jìn)入OnInit事件進(jìn)行兩個(gè)數(shù)組的分別設(shè)定：
SetIndexBuffer(0,bMaBuffer,INDICATOR_DATA);//INDICATOR_DATA表示是用于畫線的數(shù)組
SetIndexBuffer(1,bColorBuffer,INDICATOR_COLOR_INDEX);//INDICATOR_COLOR_INDEX表示是用于變色的顏色數(shù)組
注意：
如果這里要畫多條彩色線，則畫線數(shù)組和顏色數(shù)組的序號(hào)要緊鄰。
============================================
下一步就是在OnCaculate事件里進(jìn)行畫線數(shù)組的計(jì)算，同時(shí)根據(jù)自定義的條件對(duì)顏色數(shù)組進(jìn)行賦值。
賦值規(guī)則是：
當(dāng)對(duì)應(yīng)K線序號(hào)的顏色數(shù)組被賦值1.0時(shí)，對(duì)應(yīng)畫線數(shù)組的顏色為第一個(gè)顏色
當(dāng)對(duì)應(yīng)K線序號(hào)的顏色數(shù)組被賦值0.0時(shí)，對(duì)應(yīng)畫線數(shù)組的顏色為第二個(gè)顏色
完。
程序舉例源碼如下：【畫出兩個(gè)變色線】
復(fù)制代碼
2. //+------------------------------------------------------------------+
3. //| Test.mq5 |
4. //| Copyright 2009, MetaQuotes Software Corp. |
5. //| http://bbs.520fx.com |
6. //+------------------------------------------------------------------+
7. #property copyright "2009, 520FX"
8. #property link "http://www.mql5.com"
9. #property version "1.00"
10. #property indicator_chart_window
11. #property indicator_buffers 4
12. #property indicator_plots 2
13. #property indicator_color1 Red,Green
14. #property indicator_type1 DRAW_COLOR_LINE
15. #property indicator_style1 STYLE_SOLID
16. #property indicator_width1 2
17. #property indicator_color2 Yellow,Blue
18. #property indicator_type2 DRAW_COLOR_LINE
19. #property indicator_style2 STYLE_SOLID
20. #property indicator_width2 2
21. input int MaPeriod=13;
22. double bMaBuffer[],bMaBuffer1[],bColorBuffer[],bColorBuffer1[];
23. int iMaHandle,iMaHandle1;
24. //+------------------------------------------------------------------+
25. //| Custom indicator initialization function |
26. //+------------------------------------------------------------------+
27. int OnInit()
28. {
29. //--- indicator buffers mapping
30. SetIndexBuffer(0,bMaBuffer,INDICATOR_DATA);
31. SetIndexBuffer(1,bColorBuffer,INDICATOR_COLOR_INDEX);
32. SetIndexBuffer(2,bMaBuffer1,INDICATOR_DATA);
33. SetIndexBuffer(3,bColorBuffer1,INDICATOR_COLOR_INDEX);
34. IndicatorSetInteger(INDICATOR_DIGITS,_Digits);
35. iMaHandle=iMA(NULL,0,MaPeriod,0,MODE_SMA,PRICE_CLOSE);
36. iMaHandle1=iMA(NULL,0,MaPeriod+50,0,MODE_SMA,PRICE_CLOSE);
37. //---
38. return(0);
39. }
40. //+------------------------------------------------------------------+
41. //| Custom indicator iteration function |
42. //+------------------------------------------------------------------+
43. int OnCalculate(const int rates_total,
44. const int prev_calculated,
45. const datetime& time[],
46. const double& open[],
47. const double& high[],
48. const double& low[],
49. const double& close[],
50. const long& tick_volume[],
51. const long& volume[],
52. const int& spread[])
53. {
54. //--- return value of prev_calculated for next call
55. //--- checking for bars count
56. if(rates_total<MaPeriod)
57. return(0);
58. //--- detect start position
59. int start;
60. //if(prev_calculated>1) start=prev_calculated-1;
61. //else start=1;
62. if(prev_calculated<0)return(-1);else start=rates_total-prev_calculated+1;
63. int to_copy;
64. if(prev_calculated>rates_total || prev_calculated<0) to_copy=rates_total;
65. else
66. {
67. to_copy=rates_total-prev_calculated;
68. if(prev_calculated>0) to_copy++;
69. }
70. if(CopyBuffer(iMaHandle,0,0,to_copy,bMaBuffer)<=0)
71. {
72. Print("Getting fast SMA is failed! Error",GetLastError());
73. return(0);
74. }
75. if(CopyBuffer(iMaHandle1,0,0,to_copy,bMaBuffer1)<=0)
76. {
77. Print("Getting fast SMA1 is failed! Error",GetLastError());
78. return(0);
79. }
80. //--- main cycle
81. for(int i=start;i<rates_total;i++)
82. {
83. if(bMaBuffer[i]>close[i-1])
84. bColorBuffer[i]=1.0;
85. else bColorBuffer[i]=0.0;
86. if(bMaBuffer1[i]>close[i-1])
87. bColorBuffer1[i]=1.0;
88. else bColorBuffer1[i]=0.0;
89. }
90. return(rates_total);
91. }
92. //+------------------------------------------------------------------+
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