CN111820887A - Live electrocardiogram drawing method - Google Patents
Live electrocardiogram drawing method Download PDFInfo
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- CN111820887A CN111820887A CN201910301528.5A CN201910301528A CN111820887A CN 111820887 A CN111820887 A CN 111820887A CN 201910301528 A CN201910301528 A CN 201910301528A CN 111820887 A CN111820887 A CN 111820887A
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Abstract
The invention discloses a live electrocardiogram drawing method, which comprises a background layer, an information display layer, an electrocardiogram wave-shape layer, a module for adjusting the dormancy time and the like. The background layer draws fixed and unchangeable information such as background grids, calibration voltage, lead names and the like; the information display layer is composed of a plurality of display components, each component displays single parameter information, and the parameter information is updated when the parameter value changes; the electrocardiographic waveform layer regularly refreshes each frame of electrocardiographic waveform and cursor; and the sleep time adjusting module dynamically adjusts the current sleep time according to the information display layer and the time consumed for drawing the current electrocardiographic waveform frame. The method updates the information and the electrocardiographic waveform of the minimum area each time, improves the drawing efficiency and ensures that the electrocardiographic playing is smooth and fluent.
Description
Technical Field
The invention relates to a medical auxiliary instrument, in particular to a direct-broadcast electrocardiogram drawing method.
Background
At present, on equipment such as a fixed electrocardiogram machine, a handheld electrocardiogram machine, an electrocardiogram machine workstation and the like and remote monitoring related software, a displayed real-time electrocardiogram almost has no background grid, or the background grid, the electrocardiogram and parameter information are redrawn every frame. These schemes require a large amount of CPU computation, and in order to balance system performance, trade-offs must be made in the aspects of display information, delay degree, play fluency, display sampling rate, and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a live electrocardiogram drawing method, which updates the information and waveform of the minimum area every time, improves the drawing efficiency and ensures that the electrocardiogram is played very smoothly.
The invention provides a live electrocardiogram drawing method, which is characterized by comprising the following steps: the device comprises a background layer, an information display layer, an electrocardiographic waveform layer, a sleep time adjusting module and the like. The electrocardiogram is drawn on a background picture layer, an information display picture layer and an electrocardiogram waveform picture layer; according to the characteristic of the updating frequency of all electrocardiogram drawing information, drawing information with similar frequency on the same map layer; the background layer is arranged at the bottommost layer, and after a program is started, fixed and unchangeable information such as a background grid, a calibration voltage, a lead name and the like is drawn according to the size of a waveform display window; the information display layer is arranged in the middle layer, draws parameter information with low updating frequency and consists of a plurality of display components, each component displays single parameter information, and the parameter information is updated when the parameter value changes; the electrocardiographic waveform layer is arranged on the topmost layer, and each frame of electrocardiographic waveform and cursor are refreshed at regular time; and the sleep time adjusting module dynamically adjusts the current sleep time according to the information display layer and the time consumed for drawing the current electrocardiographic waveform frame.
The invention is characterized in that a background layer is arranged at the bottommost layer, and fixed and unchangeable information is drawn on the background layer, and the method comprises the following specific implementation steps:
drawing a background grid on the whole window according to the width scrWidth, the height scrHeight, the screen DPI and the electrocardiogram sampling rate sampleRate of the waveform display window;
determining the display transverse position X (i) = scrWidth/(i +1) and the longitudinal position Y (j) = (2 x j +1) scrHeight/(2 x LeadNum) of each lead according to the height of the waveform display window, wherein i is the split screen number, j is the serial number of the current split screen lead based on the index of 0, and j is the serial number of the current split screen lead based on the index of 0;
plotting the scaled voltage at the longitudinal and lateral positions of each lead;
the lead name is displayed below the lead scaling voltage.
The invention is characterized in that the information display layer is arranged in the middle layer, the parameter information with lower updating frequency is drawn on the layer and consists of a plurality of display components, each component displays single parameter information, the display position and the display size of the parameter information are reasonably distributed according to the size of a waveform display window, the parameter values are updated when being changed, and a plurality of information display layers can be absent or exist according to the quantity of the parameters and the characteristic of updating frequency.
The invention is characterized in that an electrocardiographic waveform layer is arranged at the topmost layer, each electrocardiographic waveform and a cursor are refreshed on the layer at regular time, and the specific implementation steps are as follows:
defining a refresh frame frequency f per second, and taking a value range (0,1000);
calculating the number num = f sampleRate/1000 of each frame of electrocardiogram data of each lead;
calculating the width fWidth = wWidth + sWidth of the transverse refreshing area of the current frame, wherein wWidth is the fixed waveform refreshing width, and sWidth is the cursor width;
erasing a rectangular area (x0(i), 0, x0(i) + fWidth, scrHeight) with a transparent brush, wherein i is the number of split screens, and x0 is the end position of one frame waveform on the current split screen based on the index of 0;
each lead draws each frame of electrocardiographic waveform in a rectangular region (x0(i), 0, x0(i) + wWidth, scrHeight) based on the last waveform end position (x (j), y (j)), where i is the number of split screens and x0 is the end position of the frame of waveform currently on the split screen based on the index of 0.
The invention is characterized in that the sleep time adjusting module dynamically adjusts the current sleep time according to the time consumed by the information display layer and the current electrocardiogram waveform frame drawing, and the sleep time calculating step is as follows:
calculating ideal interval time interval = f/1000 of each frame of electrocardiogram;
calculating updating parameters and time eslpsed = timestamp1-timestamp2 consumed by drawing the current frame electrocardiogram, wherein the timestamp1 is a timestamp for starting drawing, and the timestamp2 is a timestamp for ending drawing;
the sleep time sleeplnterval = interval-eslpsed is calculated.
Drawings
Fig. 1 is a flow chart of a live electrocardiogram drawing method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a diagram layer according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a background layer according to an embodiment of the invention.
Fig. 4 is a schematic diagram of an information display layer according to an embodiment of the invention.
Fig. 5 is a schematic diagram of an electrocardiographic waveform layer according to an embodiment of the present invention.
FIG. 6 is a diagram of an electrocardiographic waveform frame according to an embodiment of the present invention.
FIG. 7 is a schematic electrocardiogram of an embodiment of the present invention.
Detailed description of the invention
The following detailed description of embodiments of the invention refers to the accompanying drawings.
According to an embodiment of the present invention, a live electrocardiogram drawing method is described by taking development based on C + + programming language as an example, however, it should be understood by those skilled in the art that the application of the present invention is not limited to C + + programming voice, and other programming voices (including but not limited to C #, VB, QT, Android, Objective-C, PHP, python, HTML5, etc.) can be applied to the present invention.
Fig. 1 is a flow chart of a live electrocardiogram rendering method according to an embodiment of the present invention. The flow chart includes drawing a background grid 100 in a background layer according to the waveform display window size; determining the display longitudinal and transverse positions of each lead according to the height of a waveform display window, and drawing a scaling voltage and a lead name on a background layer 101; reasonably arranging the parameter positions and determining the display size according to the size of the waveform display window, and displaying each parameter information 102 on the information display layer; quitting the playing judgment module 103; a parameter change judgment module 104; updating the changed parameters 105 on the information display layer; refreshing the electrocardiogram waveform and the cursor 106 of the current frame according to the position of each lead on the electrocardiogram waveform layer; the sleep time is calculated and adjusted and the drawing thread goes to sleep 107.
After the program is started, three layers are defined, as shown in fig. 2, a background layer 200 is at the bottommost layer, and fixed and unchangeable information is drawn on the layer; the information display layer 201 is arranged in the middle layer, and the parameter information with lower updating frequency is drawn on the layer; the electrocardiographic waveform layer 202 is at the top, and each frame of electrocardiographic waveform and cursor is periodically refreshed on this layer.
Background layer background grid 300 in fig. 3 is drawn on background layer 200 according to the width scrWidth, height scrHeight, screen DPI and electrocardiogram sampling rate sampleRate of the waveform display window; the display positions 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, and 312 of each lead in fig. 3 are determined by the waveform display window height as the horizontal position x (i) = scrWidth/(i +1), and the vertical position y (j) = (2 × j +1) schreheight/(2 × LeadNum), where i is the number of split screens, based on the index of 0, j is the current split screen lead number, based on the index of 0; plotting the scaled voltages at the display locations 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, and 312 of each lead in FIG. 3; 4) the lead names are displayed below the lead scaling voltages, see 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, and 324 in FIG. 3.
An exit play judging module 103 is arranged at the entrance of the timing execution program, and if the electrocardiogram drawing is required to exit, the electrocardiogram drawing task exits; if the electrocardiograph is not to be exited, the parameter change determination module 104 is entered.
The parameter change judging module 104 analyzes whether the parameter value changes, and if the parameter value changes, the information layer 201 is entered to update the parameter information 105; if no parameter value changes, the current electrocardiographic waveform and the cursor 106 are drawn in the electrocardiographic waveform layer 202.
The information layer 201 updates the parameter information 105 and if the current heart rate 400 has a number, it is updated in real time, as shown in fig. 4.
The electrocardiographic waveform layer 202 draws the current frame electrocardiographic waveform and the cursor 106, and as shown in fig. 5, first defines a refresh frame frequency f per second to take a value range (0,1000), calculates the number num = f sampleRate/1000 of electrocardiographic data per frame per lead, calculates the width fWidth = wWidth + sfidth of the current frame transverse refresh area 500, where wWidth is a fixed waveform refresh width 501 and sfidth is a cursor width 502, and then erases a rectangular area (x0(i), 0, x0(i) + fWidth, scrHeight) with a transparent brush, where i is the number of divided screens, based on an index of 0, and x0 is the end position of a waveform of the frame on the current divided screen, each lead is based on the last waveform end position (x (j), y (j), draws the rectangular area (x0(i), 0, x0(i) + wddth, scrHeight) on the number of divided screens, where x is the number of divided screens, and the number of divided screens is 0, and where x0 is the number of divided screens, the remaining space area of sfidth serves as a cursor 502; after all the layers are drawn, the effect shown in fig. 7 is finally formed.
The sleep time adjusting module dynamically adjusts the current sleep time 107 according to the time consumed by the information display layer and the current electrocardiographic waveform frame drawing, and the sleep time calculating step is as follows: calculating ideal interval time interval = f/1000 of each frame of electrocardiogram; calculating updating parameters and time eslpsed = timestamp1-timestamp2 consumed by drawing the current frame electrocardiogram, wherein the timestamp1 is a timestamp for starting drawing, and the timestamp2 is a timestamp for ending drawing; calculating sleep time sleepInterval = interval-eslpsed; and finally setting the sleep time of the drawing thread.
Claims (5)
1. A live electrocardiogram drawing method is characterized by comprising the following steps:
the electrocardiogram is drawn on a background map layer, an information display map layer and an electrocardiogram waveform map layer, and according to the characteristic of respective update frequency of all electrocardiogram drawing information, information with similar frequency is drawn on the same map layer;
the background layer is arranged at the bottommost layer, and after a program is started, fixed and unchangeable information such as a background grid, a calibration voltage, a lead name and the like is drawn according to the size of a waveform display window;
the information display layer is arranged in the middle layer, the parameter information with lower updating frequency is drawn, the information display layer is composed of a plurality of display components, each component displays single parameter information, the parameter values are updated when changed, and a plurality of information display layers can be absent or exist according to the quantity of the parameters and the characteristic of the updating frequency;
the electrocardiographic waveform layer is arranged on the topmost layer, and each frame of electrocardiographic waveform and cursor are refreshed at regular time;
and the sleep time adjusting module dynamically adjusts the current sleep time according to the information display layer and the time consumed for drawing the current electrocardiographic waveform frame.
2. The direct electrocardiogram drawing method of claim 1, wherein: the background layer is arranged at the bottommost layer, and fixed and unchangeable information is drawn on the background layer, and the method is concretely implemented by the following steps:
1) drawing a background grid on the whole window according to the width scrWidth, the height scrHeight, the screen DPI and the electrocardiogram sampling rate sampleRate of the waveform display window;
2) determining the display transverse position X (i) = scrWidth/(i +1) and the longitudinal position Y (j) = (2 x j +1) scrHeight/(2 x LeadNum) of each lead according to the height of the waveform display window, wherein i is the split screen number, j is the serial number of the current split screen lead based on the index of 0, and j is the serial number of the current split screen lead based on the index of 0;
3) plotting the scaled voltage at the longitudinal and lateral positions of each lead;
4) the lead name is displayed below the lead scaling voltage.
3. The direct electrocardiogram drawing method of claim 1, wherein: the information display layer is arranged in the middle layer, the parameter information with low updating frequency is drawn on the layer and consists of a plurality of display components, each component displays single parameter information, the display positions and the display sizes of the parameter information are reasonably distributed according to the size of the waveform display window, the parameter values are updated when changed, and a plurality of information display layers can be absent or exist according to the quantity of the parameters and the characteristic of updating frequency.
4. The direct electrocardiogram drawing method of claim 1, wherein: the electrocardiographic waveform layer is arranged on the topmost layer, each electrocardiographic waveform and each cursor are refreshed on the layer at regular time, and the specific implementation steps are as follows:
1) defining a refresh frame frequency f per second, and taking a value range (0,1000);
2) calculating the number num = f sampleRate/1000 of each frame of electrocardiogram data of each lead;
3) calculating the width fWidth = wWidth + sWidth of the transverse refreshing area of the current frame, wherein wWidth is the fixed waveform refreshing width, and sWidth is the cursor width;
4) erasing a rectangular area (x0(i), 0, x0(i) + fWidth, scrHeight) with a transparent brush, wherein i is the number of split screens, and x0 is the end position of one frame waveform on the current split screen based on the index of 0;
5) each lead draws each frame of electrocardiographic waveform in a rectangular region (x0(i), 0, x0(i) + wWidth, scrHeight) based on the last waveform end position (x (j), y (j)), where i is the number of split screens and x0 is the end position of the frame of waveform currently on the split screen based on the index of 0.
5. The direct electrocardiogram drawing method of claim 1, wherein: the sleep time adjusting module dynamically adjusts the current sleep time according to the time consumed by the information display layer and the current electrocardiographic waveform frame drawing, and the sleep time calculating step is as follows:
1) calculating ideal interval time interval = f/1000 of each frame of electrocardiogram;
2) calculating updating parameters and time eslpsed = timestamp1-timestamp2 consumed by drawing the current frame electrocardiogram, wherein the timestamp1 is a timestamp for starting drawing, and the timestamp2 is a timestamp for ending drawing;
3) the sleep time sleeplnterval = interval-eslpsed is calculated.
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| CN201910301528.5A CN111820887A (en) | 2019-04-16 | 2019-04-16 | Live electrocardiogram drawing method |
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| CN201910301528.5A CN111820887A (en) | 2019-04-16 | 2019-04-16 | Live electrocardiogram drawing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116152385A (en) * | 2023-04-21 | 2023-05-23 | 索思（苏州）医疗科技有限公司 | Physiological signal drawing method and device, electronic equipment and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116152385A (en) * | 2023-04-21 | 2023-05-23 | 索思（苏州）医疗科技有限公司 | Physiological signal drawing method and device, electronic equipment and storage medium |
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