CN109612509B - Trend graph display processing method based on handheld signal measuring instrument - Google Patents
Trend graph display processing method based on handheld signal measuring instrument Download PDFInfo
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a trend graph display processing method based on a handheld signal measuring instrument, and belongs to the field of measurement of instruments and meters. The invention provides a trend graph display processing method which is suitable for a handheld signal measuring instrument and has the advantages of good data refreshing instantaneity, high measuring result accuracy and strong user operation friendliness; the real-time display function that interface refreshing is carried out when each measuring point arrives is provided; providing a friendly interface for displaying results; the accuracy of reading the trend graph by the user is improved; the method solves the problem that different handheld frequency measuring instruments have different screen resolutions to cause the display of the trend graph, and overcomes the defects that the flexibility of fixing the number of points to be displayed is poor, the display refresh rate of completely displaying the measuring result is slow, and a user can not operate the trend graph nearby a certain measuring point.
Description
Technical Field
The invention belongs to the field of measurement of instruments and meters, and particularly relates to a trend graph display processing method based on a handheld signal measuring instrument.
Background
Along with the development and progress of measurement technology, people have more and more demands on various measuring instruments, and the high-precision handheld frequency measuring instrument is suitable for the development trend of the industry, has the advantages of easiness in carrying, high measuring precision, diversified functions and the like, and can accurately measure the frequency, time, period and the like of signals. The trend graph with real-time, accuracy and high friendliness degree has important significance as a way for a user to observe signal characteristics, and people continuously improve and perfect ideas when performing display processing of the trend graph and design different display methods. The hand-held frequency measuring instruments on the market often adopt a method of data extraction, processing and display on the display processing of the trend chart, so that the curve drawing speed can be greatly improved, and the trend of the change of measured data such as frequency and the like can be reflected to a certain extent.
The existing implementation scheme is as follows:
1. the direct display mode is as follows:
the handheld frequency measuring instrument stores each measured data into a memory, and the number of points to be displayed is fixed when a trend graph is displayed; reading a corresponding amount of measured data from the memory for drawing; the trend graph of the fixed point number is refreshed every time new measurement data come, so that the effect of real-time display is achieved.
2. A data extraction mode:
the handheld frequency measuring instrument stores each measured data into a buffer area, and the number of points to be displayed is fixed according to pixels of a display screen; if the total measured points are less than the points to be displayed, directly drawing a curve graph, and if the total measured points are greater than the points to be displayed, drawing the curve graph after extracting the total points; and refreshing the trend graph when each new measurement data comes.
The prior art has the following disadvantages:
1. the direct display mode has the following defects:
the number of points to be displayed is fixed, and a user cannot observe the trend of a large amount of measurement data at the same time;
if the number of the fixed points is too large, the defect of low drawing efficiency of a trend graph can occur during the display processing of the measured data, and the real-time display effect is poor.
2. The data extraction method has the following defects:
after the number of points to be displayed is fixed, although the data is extracted and displayed, the data change trend can be approximately reflected, but the data is distorted due to insufficient detail;
the user needs to additionally set when knowing the trend near a specific measuring point, and the operation is not suitable;
the curve in the trend graph connects the maximum values of the adjacent measurement point arrays, and each maximum value is connected with the minimum value, so that the display is complicated and is not easy to understand.
3. Other disadvantages:
the screen resolution of different handheld frequency measuring instruments is different, and the display mode flexibility of the fixed measuring point number is poor.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a trend chart display processing method based on a handheld signal measuring instrument, which is reasonable in design, overcomes the defects of the prior art and has a good effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a trend graph display processing method based on a handheld signal measuring instrument comprises the following steps:
step 1: after entering a trend graph display function, judging whether the number of measurement points is greater than 10000 of a maximum display value;
if: if the judgment result is that the number of the measurement points is larger than the maximum display value 10000, the measurement curve is translated, the initial value is modified to be-10000 of the current points, and new 10000 of measurement points are read;
or judging whether the number of the measurement points is less than or equal to 10000 of the maximum display value or not according to the judgment result, and judging whether the number of the measurement points is greater than or equal to the resolution of the screen;
if: if the judgment result is that the number of the measurement points is greater than or equal to the screen resolution, a new array is created, and the data of the measurement points is processed;
or if the judgment result is that the number of the measurement points is smaller than the resolution of the screen, the original array is used for display processing;
step 2: after data processing, a trend graph display coordinate system is established according to a screen area;
and step 3: drawing a curve according to the measuring point array;
and 4, step 4: judging whether to perform display point control or not;
if: if the judgment result is that the display point number is controlled, restarting the display processing according to the controlled point number to be displayed;
or if the judgment result is that the display point control is not performed, displaying a trend graph;
and 5: and (6) ending.
The invention has the following beneficial technical effects:
the invention provides a trend graph display processing method which is suitable for a handheld signal measuring instrument and has the advantages of good data refreshing instantaneity, high measuring result accuracy and strong user operation friendliness; the real-time display function that interface refreshing is carried out when each measuring point arrives is provided; providing a friendly interface for displaying results; the accuracy of reading the trend graph by the user is improved; the method solves the problem that different handheld frequency measuring instruments have different screen resolutions to cause the display of the trend graph, and overcomes the defects that the flexibility of fixing the number of points to be displayed is poor, the display refresh rate of completely displaying the measuring result is slow, and a user can not operate the trend graph nearby a certain measuring point.
The display point number is not fixed, a user can calculate the number of pixels of the transverse axis of the trend graph according to the current screen resolution so as to obtain a measurement trend graph which can fully utilize the screen resolution, and the flexibility is high;
the invention fully utilizes the screen resolution, displays the measurement curve without distortion, and has high accuracy;
the curve segments with overlapped abscissas are drawn only once, so that the updating efficiency of the trend graph is improved, the display is not distorted, and the high real-time performance can be ensured.
Drawings
FIG. 1 is a diagram illustrating a context structure of a processing method.
Fig. 2 is a schematic diagram of a trend graph structure.
Fig. 3 is a graph plotting diagram of the number of measurement points greater than the resolution of the horizontal axis.
Fig. 4 is a trend graph display processing diagram.
FIG. 5 is a schematic of curve plotting using the new array.
Fig. 6 is a flow chart of a trend graph display processing method.
Fig. 7 is a diagram showing a relationship between the trend graph and the processing method.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
1. description of the context structure
The method is applied to a graphic display module of a high-precision handheld frequency measuring instrument and is responsible for displaying the trend of measured data. Fig. 1 is a context structure diagram of the display processing method, wherein a "trend graph display interface" is an application support of the technology. The hardware measurement system of the handheld frequency measurement instrument sends the measurement data to the software system of the handheld frequency measurement instrument, and the software system stores the data into a measurement data buffer area for displaying and using of a trend graph. And the user sets the trend graph according to the requirement, controls the reading of the measurement data and modifies the display result.
2. Schematic structure diagram of trend chart
The high-precision handheld measuring instrument has high requirements on the precision of measured data and the like, and the trend graph structure shown in fig. 2 is adopted to realize the observation of the trend of the measured data by a user. The trend graph comprises a coordinate system horizontal axis, a coordinate system vertical axis, a curve graph, a horizontal and vertical axis unit and a measurement point count, wherein the horizontal axis represents the measurement points, and the horizontal axis finally displays the number of the current measurement points; the vertical axis displays the measured value of the corresponding point according to the measurement function; the curves represent measured data traces. Wherein, the maximum value of the horizontal axis is 10000, when the number of the measuring points is less than 10000, the curve is continuously drawn and compressed along with the increase of the measuring points; when the number of the measuring points is more than 10000, the curve is not compressed any more, and translation is carried out. The longitudinal axis direction is automatically scaled according to the maximum and minimum values of all measurement points.
Because the screen of the handheld measuring instrument is small and the resolution of the screen is low, when the number of measuring points exceeds the resolution of the horizontal axis, the phenomenon that the X coordinates of some points are the same appears, as shown in FIG. 3.
Under the restriction of an operating system drawing mechanism and screen resolution, a curve can only be drawn on pixel points of an integer value, and when some measuring points are overlapped, the curve can be drawn back and forth among the measuring points. For a user, no change occurs on the curve display, but for an application program, the operation speed of the software is greatly wasted, and the drawing process is optimized according to the phenomenon.
3. Description of the principles
The method is applied to a trend chart display module of a high-precision hand-held frequency measuring instrument, a software operation platform is a WINCE7.0 operating system, a debugging platform is a Windows XP operating system, a development tool is Microsoft Visual Studio 2005, a development language is C + +, and interface design is based on an MFC class library.
The software system comprises a digital display mode and a graphic display mode for the display aspect of the measured data, and the graphic display mode comprises trend chart display and histogram display. The method comprises the steps that a trend graph can help a user to see the dynamic fluctuation range of measured data and track and amplify a dynamic change curve of the data in a specified interval, the measured data are refreshed in real time, when new measured data come, a current curve graph is refreshed in time and is influenced by the memory and the resolution of an operating system, and the measurement rate is influenced when the data volume is large by a real-time data display function, so that the display processing is improved, and the display rate is improved under the condition that the measurement result is not distorted completely.
The software system divides the display interface into a plurality of areas according to the screen resolution: trend graph area, information area, menu area. The method comprises the steps of obtaining the area size of a trend graph through calculation, and drawing a coordinate system of a curve graph to be displayed on the basis, wherein the horizontal axis of the coordinate system represents the number of measurement points, and the vertical axis of the coordinate system represents the measurement value corresponding to the measurement point. The bottom hardware measurement system sends the measurement data to the software system, and the software saves the measured data to a storage buffer capable of accommodating the above-million measurement data.
The method reads at most 10000 measurement data in the buffer area at one time, if all data are directly dynamically displayed, every two adjacent points need to be connected, when the number of the connected lines exceeds the resolution of a screen, the X coordinates of the measurement points are overlapped, and at the moment, a curve can repeatedly draw line segments up and down between the measurement points on the same X coordinate. Therefore, in order to improve the measurement efficiency and ensure the authenticity of real-time display, the measurement points with the same X value are processed to obtain a group of measurement points containing a maximum value, a minimum value, a starting value and an ending value, and the label is marked as i.
Creating a new array, and storing the measuring points after regrouping into the array, wherein the creating method of the new array comprises the following steps:
(1) calculating the number of pixels of a cross shaft in the trend graph area, and judging whether the number of current measurement points is greater than the number of pixels according to the original data array;
(2) searching all measurement points with the same X value, calculating and storing the maximum value, the minimum value, the initial value and the final value of the points, storing the points into a new array, and marking the group of data indexes from 0;
(3) and drawing a curve graph by using the new array, connecting the minimum value of the maximum value in the Y-axis direction, and connecting the termination point of the previous array with the start point of the next array in the X-axis direction. As shown in fig. 5.
4. Description of the flow
The trend graph display processing method flow is shown in fig. 6. After entering the trend graph display function, judging whether the number of the measurement points is greater than 10000 which is the maximum display value, if so, translating the curve, and modifying the initial value as follows: the number of current points is-10000, and new 10000 measurement points are read; if the resolution is smaller than the screen resolution, judging whether the resolution is larger than the screen resolution, if the resolution is smaller than the screen resolution, displaying and processing the image according to the original mode, and if the resolution is larger than the screen resolution, using the new array.
And after data processing, a trend graph display coordinate system is established according to the screen area, curve drawing is carried out according to the measuring point array, whether display point control is carried out or not is judged, and if the control is carried out, display processing is restarted according to the controlled points to be displayed.
5. Description of the relationship of actions
And after the software system stores the measurement data, the measurement data is provided for the digital display module and the graphic display module to be used according to the user requirements. The trend graph is in a closed state in a default state, the trend graph is displayed and processed according to the continuous increase of the measured data after being opened, and the trend graph is displayed dynamically after the processing is finished; when the user performs the [ mark | zoom ] function on operation, the trend graph stops refreshing, and the trend graph is refreshed again according to the setting of the display points, the reference points, the marks and the like.
Key technical point for bringing beneficial effect to the invention
1. The display point number is not fixed, a user can calculate the number of pixels on the horizontal axis of the trend graph according to the current screen resolution, so that the measurement trend graph capable of fully utilizing the screen resolution is obtained, and the flexibility is high.
2. The screen resolution is fully utilized, the measurement curve is displayed without distortion, and the accuracy is high.
3. The curve segments with overlapped abscissas are drawn only once, so that the updating efficiency of the trend graph is improved, and higher real-time performance can be ensured while display is not distorted.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (1)
1. A trend graph display processing method based on a handheld signal measuring instrument is characterized by comprising the following steps: the method comprises the following steps:
step 1: after entering a trend graph display function, judging whether the number of measurement points is greater than 10000 of a maximum display value;
if: if the judgment result is that the number of the measurement points is larger than the maximum display value 10000, the measurement curve is translated, the initial value is modified to be-10000 of the current points, and new 10000 of measurement points are read;
if the judgment result is that the number of the measurement points is less than or equal to 10000 of the maximum display value, judging whether the number of the measurement points is greater than or equal to the resolution of the screen;
if: if the judgment result is that the number of the measurement points is greater than or equal to the screen resolution, a new array is created, and the data of the measurement points is processed;
if the judgment result is that the number of the measurement points is smaller than the resolution of the screen, the original array is used for display processing;
step 2: after data processing, a trend graph display coordinate system is established according to a screen area;
and step 3: drawing a curve according to the measuring point array;
and 4, step 4: judging whether to perform display point control or not;
if: if the judgment result is that the display point number is controlled, restarting the display processing according to the controlled point number to be displayed;
if the judgment result is that the display point control is not carried out, displaying a trend graph;
and 5: and (6) ending.
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