CN102053185B - Digital oscilloscope having area print and print preview functions and control method thereof - Google Patents

Abstract

A printing method with the functions of area printing and print preview, comprising steps: 1) area printing step: 1.1) start printing operation; 1.2) obtain the data set corresponding to the printing area from the graphics card data source according to the printing area set by the user And save the data set parameters, superimpose the acquired data set according to the data set parameters, generate print data and save; 1.3) Send the print data to the printer. 2) Print preview steps: 2.1) Receive user instructions and start the preview operation; 2.2) Acquire the data set corresponding to the printing area from the graphics card data source and save the data set parameters according to the printing area set by the user, and save the data set according to the obtained data set The data set parameters are superimposed on the layers, and the print data is generated and saved; 2.3) The preview source data is obtained from the print data, and the preview source data is converted into preview data that meets the preview settings and saved; 2.4) The preview data is displayed in the preview interface come out. This method can realize area printing and preview printing data.

Description

Digital oscilloscope with area print and print preview function and its control method

technical field

The invention relates to a digital oscilloscope with the functions of area printing and printing preview and its control method.

Background technique

The digital oscilloscope can observe the signal waveform intuitively and is a basic instrument in the measurement field. In the measurement, the user often saves the problem signal as a picture after capturing the problem signal with the oscilloscope, and prints the picture through the PC when it needs to be used.

At present, all digital oscilloscopes have a direct printing function. Direct printing allows users to obtain printing results without using a PC, which provides convenience for users to a certain extent and improves user experience.

However, the user cannot preview the printing effect before printing. Therefore, the picture obtained by the user through direct printing may not be what he wants. In this way, the user has to set up and print again until satisfied.

Currently, the default printing area supported by the digital oscilloscope is the screen, and it cannot be selected. When the user wants to print only the waveform, he must first save the screen display as a picture, and then extract the waveform area on the PC before printing.

As mentioned above, currently all digital oscilloscopes are equipped with a printing function, but the printing function has the following disadvantages:

1. Users cannot select the print area, that is, they cannot print selectively;

2. Users cannot preview the printing results, that is, they cannot predict the printing effect.

Contents of the invention

In view of this, the purpose of the present invention is to provide a digital oscilloscope with the function of area printing and print preview and its printing method. Effect.

To achieve the above object, the present invention adopts the following technical solutions:

A printing method with functions of area printing and print preview, comprising the following steps:

1) Regional printing steps, including:

1.1) Receive the printing start instruction issued by the user, and start the printing operation;

1.2) According to the printing area set by the user, obtain the data set corresponding to the printing area from the graphics card data source and save the data set parameters, and overlay the acquired data set according to the data set parameters to generate print data and save it;

1.3) Send the print data to the printer for printing,

2) Print preview steps, including:

2.1) Receive user instructions and start the preview operation;

2.2) According to the printing area set by the user, obtain the data set corresponding to the printing area from the graphics card data source and save the data set parameters, and overlay the acquired data set according to the data set parameters to generate print data and save it;

2.3) Obtain the preview source data from the print data, convert the preview source data into preview data conforming to the preview settings and save it;

2.4) Display the preview data in the preview interface.

A digital oscilloscope with area printing and print preview functions, including: front-end signal conditioning unit, ADC, data processing unit, trigger processing unit, display/control unit, screen, keyboard and peripherals, wherein: the output of the front-end signal conditioning unit Connect the ADC and the trigger processing unit, the input connection between the ADC and the data processing unit, the input connection between the trigger processing unit and the data processing unit, the output of the data processing unit is sent to the screen through the display/control unit, and the keyboard and peripherals are connected to the display/control unit ; After the signal is digitally conditioned by the front end, it is sampled by the ADC, and the ADC sends the digitized signal to the data processing unit for calculation, and the data processing unit sends it to the screen for display.

further:

The printing area set by the user in the steps 1.2) and 2.2) includes a screen area and a waveform area. The screen area refers to all areas displayed on the screen, and the waveform area refers to only the waveform in the print result.

The graphics card data source in described steps 1.2) and 2.2) refers to the graphics card physical layer data, and the graphics card has multiple physical layers, and each layer carries different display data, and the display layer generated through layer superposition is The data displayed on the screen is stacked in a bottom-up order, that is, the background layer is the bottom layer and the menu layer is the top layer.

The data sets in the steps 1.2) and 2.2) refer to the data obtained from the graphic card layer according to the printing area.

The data set parameters in the steps 1.2) and 2.2) include the upper left and lower right vertex coordinates and layer overlay attributes of different graphics card layers relative to the same coordinate system, and the overlay attributes include at least AND, OR, XOR, and coverage.

The methods for obtaining data sets and their parameters in steps 1.2) and 2.2) include the following steps according to different regions:

If the printing area is the screen, first obtain and save the physical layer data of the graphics card from bottom to top, and save the data parameters of each layer at the same time; then superimpose the same coordinates of different layers in sequence according to the physical layer from bottom to top according to the coordinates and overlay attributes data, the superimposed data is the print data,

If the print area is a waveform, obtain and save the graphics card waveform layer data to obtain the print data.

When the printing area is the screen, the implementation steps are as follows:

Obtain the parameters of the physical layer data set of each graphics card, and determine the rectangular frame after the layer data is superimposed;

According to the coordinates of the rectangular frame and the physical layer of the graphics card, the same coordinate data in each layer is sequentially taken from bottom to top and superimposed in sequence.

The preview settings described in step 2.3) in the implementation of the print preview at least include preview horizontal, vertical movement and preview zoom ratio;

The method for obtaining the preview data from the print data in the step 2.3) includes:

2.3.1) Calculate the location information of the preview data relative to the print data according to the preview settings;

2.3.2) Scale the corresponding print data in sequence according to the scaling ratio according to the obtained position information, and the scaled data is the preview data, and the position information includes at least a start row, a start column, an end row, and an end column.

The present invention has following beneficial effect:

1. When printing, the present invention can print according to the printing area set by the user, effectively highlighting the key points of printing;

2. The present invention can perform print preview first when printing, and the printing effect can be predicted before printing, and based on this, the printing settings can be effectively modified to improve the effectiveness of the printing result.

Description of drawings

Fig. 1 is the basic structural diagram of digital oscilloscope of the present invention;

Fig. 2 is the hardware composition block diagram of digital oscilloscope of the present invention;

Fig. 3 is the printing flowchart of the present invention;

Fig. 4 is a print preview flow chart of the present invention;

Fig. 5 is a schematic diagram of the physical layer of the graphics card;

Figure 6 shows the rectangular frame of the superposition result;

Fig. 7 and Fig. 8 are system operation interface figure;

Figure 9 is a flow chart of the system's operation.

Detailed ways

The invention relates to a digital oscilloscope with the functions of area printing and printing preview and its control method.

The basic structure of the digital oscilloscope of the present invention is shown in Figure 1, which includes: a front-end signal conditioning unit, ADC, data processing unit, trigger processing unit, display/control unit, screen, keyboard and peripherals. Among them: the output of the front-end signal conditioning unit is connected to the ADC and the trigger processing unit, the input of the ADC to the data processing unit is connected, the trigger processing unit is connected to the input of the data processing unit, the output of the data processing unit is sent to the screen through the display/control unit, and the keyboard And peripherals connected display / control unit.

After the signal is digitally conditioned by the front end, it is sampled by one or several ADCs, and then the digitized signal is sent to the data processing unit for calculation and finally displayed.

Its detailed hardware structure is shown in Figure 2, mainly including: four front-end analog circuit channels, two ADC sampling channels, two data processing units, display control unit, and screen. Among them: four channels are independent front-end analog circuit channels, and each channel has independent channel setting, amplification attenuation, offset and trigger circuit. The signal conditioned by the front-end analog channel is sampled by the ADC, where ADC1 is responsible for the sampling of channel 1 and channel 2, and ADC2 is responsible for the sampling of channel 3 and channel 4. Each ADC has four independent ADC units inside, which can be interleaved through control selection In some cases, when four ADC units collect one front-end analog channel at the same time, the highest sampling rate of 5GSa/s will be achieved. The data processing units PGA1 and FPGA2 are respectively responsible for the sampling processing of two groups of channels. The data collected by the ADC will be sorted into traces here, and the oscilloscope will collect waveform data at a maximum of 130,000 frames per second. Since the LCD screen can only refresh about 30 times per second, the data processing units FPGA3 and FPGA4 are responsible for superimposing tens of thousands of trajectories into dozens of frames. The pixels are used to extract and interpolate the waveform points, and these data frames are displayed on the LCD screen through the display control unit in the data processing unit FPGA5.

The user's key value is decoded by CPLD and transmitted to DSP. According to the steps set in the program, the circuit and display are controlled by FPGA5. The memory that users can use directly is controlled and operated by DSP.

At the same time, in order to ensure the safety of the circuit, there is also a coprocessor MCU on the motherboard, which monitors the voltage, temperature and other information in the hardware circuit through sensors, and transmits this information to the DSP.

The printing method with the functions of area printing and print preview of the present invention can be applied to but not limited to the current oscilloscope platform. It includes the following steps:

1) Regional printing steps, Figure 3 is the implementation process of the regional printing function, including the following steps:

1.1) Receive the printing start instruction issued by the user, and start the printing operation;

1.2) Acquire the data set corresponding to the printing area from the graphics card data source according to the printing area set by the user and save the data set parameters, then superimpose the acquired data set according to the data set parameters according to the printing area setting, generate printing data and save it;

The dataset refers to the data obtained from different coordinates of different layers, and the dataset parameters describe the start and end coordinates and mutual superposition properties of the data from each layer in the dataset. Superposition according to dataset parameters means that the data from different layers in the dataset are superimposed on the data of the same coordinates according to the coordinates and attributes described by the dataset parameters. For example, data A belongs to layer a, and the coordinates are (20, 30); data B belongs to layer b, and the coordinates are also (20, 30), then data A should be superimposed on data B, and the superposition attribute is located at the upper The data of the layer is determined.

1.3) Communicate with the printer, send the print data to the printer for actual printing.

2) Print preview step, Figure 4 is the implementation process of the print preview function, including the following steps:

2.1) Receive user instructions and start the preview operation;

2.2) According to the printing area set by the user, obtain the data set corresponding to the printing area from the data source of the graphics card and save the data set parameters, and then according to the printing area setting, overlay the obtained data set according to the data set parameters to generate printing data, and save it at the same time print data;

2.3) According to the preview setting, obtain the preview source data from the print data, convert it into the preview data conforming to the preview setting and save it. The data conforming to the preview setting refers to obtaining and saving the preview data according to the offset and zoom factor of the preview setting. The scaled data;

2.4) Display the preview data in the preview interface.

The realization of the above-mentioned area printing and print preview needs to construct the print data through the following steps first.

The user-set printing area described in steps 1.2) and 2.2) includes screen and waveform areas. The screen area refers to all areas displayed on the screen (the left and right menus need to be hidden), and the waveform area refers to only waveforms included in the printout.

The data source of the graphics card described in steps 1.2) and 2.2) refers to the physical layer data of the graphics card. As shown in Figure 5, the graphics card has multiple physical layers, each layer carries different display data, and the display image generated by layer superposition The layer is the screen display data. The stacking order is from bottom to top, that is, the background layer is the bottom layer, and the menu layer is the top layer.

The data sets described in steps 1.2) and 2.2) refer to the data obtained from the graphics card layer according to the aforementioned printing area.

The data set parameters described in steps 1.2) and 2.2) include the upper left and lower right vertex coordinates and layer overlay properties of different graphics card layers relative to the same coordinate system. For example, the coordinates of each vertex of the menu layer in Figure 6 are (left, top), (right, top), (right, bottom), (left, bottom) clockwise from the upper left vertex, then the coordinates in the data set parameters The parameters are (left, top) and (right, bottom).

The overlay attribute at least includes: AND, OR, XOR, and coverage. For example, there are five layers A, B, C, D, and E. The stacking order is from bottom to top, and the stacking attributes are AND, OR, XOR, and Overlay in turn. Take the points with the same coordinates on each layer. Suppose they are a, b, c, d, e respectively and the data value of this point is (binary number):

a＝1101 1111 1110 1100

b＝0101 0011 0111 1011

c＝1011 1100 1000 1011

d＝0000 0110 0011 0110

e＝1100 1100 1011 1111

The intermediate value of the design calculation is f and the AND, OR, and XOR operations are all bit operations, then:

The result of f=a and b is f=0101 0011 0110 1000

The result of f=f or c is f=1111 1111 1110 1011

The result of f=f XOR d is f=1111 1001 1101 1101

The result of f=f covering e is f=e=1100 1100 1011 1111

The methods for obtaining data sets and their parameters described in steps 1.2) and 2.2) include the following steps according to different regions:

1. The printing area is the screen

1) Acquire and save the physical layer data of the graphics card from bottom to top. At the same time, the data parameters of each layer should be saved, that is, the coordinates of the four vertices of each layer relative to the screen and the overlay properties of the layers should be saved.

2) According to the coordinates and superimposition attributes, the data of the same coordinates of different layers are superimposed sequentially according to the order of the physical layers from bottom to top, and the data obtained by the superposition is the print data. Exceptions are menus.

2. The print area is a waveform

Obtain and save the waveform layer data of the graphics card to obtain the print data. The graphics card has a waveform layer, and the data can be directly exported from the waveform layer of the graphics card, that is, the data is read from the waveform layer memory of the graphics card into the memory used to save the data.

When the printing area is the screen, the implementation steps can also be as follows:

1) Obtain the parameters of the physical layer data set of each graphics card, determine the rectangular frame after the layer data is superimposed, take the maximum value of the vertex coordinates of each superimposed layer, that is, obtain the vertex coordinates of the rectangular frame, and the rectangular frame is used to describe the superposition The vertex coordinates of the subsequent data, that is, the data range to be superimposed. As shown in Figure 6.

2) According to the coordinates of the rectangular frame and the physical layer of the graphics card, the same coordinate data in each layer is sequentially taken from bottom to top and superimposed in sequence. The overlay method is also determined by the layer overlay property.

The preview settings described in step 2.3) in the implementation of the print preview at least include: preview horizontal, vertical movement and preview zoom ratio.

The method for obtaining the preview data from the print data described in step 2.3) includes:

2.3.1) Calculate the location information of the preview data relative to the print data according to the preview settings;

2.3.2) According to the obtained position information, the corresponding printing data is sequentially scaled according to the scaling ratio, and the scaled data is the preview data.

Wherein, the position information at least includes: a start row, a start column, an end row, and an end column.

The location information calculation method includes the following steps:

1. Determine the center coordinates of the preview data: first, when the zoom factor is less than 1, the center coordinate remains the same as the default value; secondly, the center coordinate remains unchanged when only the zoom factor is changed; finally, the main factors affecting the center coordinate are Horizontal and vertical offset. Calculation formula: Let the default center coordinates be (x0, y0) = (240, 400), the zoom factor is k1, the horizontal offset is Xoffset, the vertical offset is Yoffset, and the calculated center coordinates are (x, y), then:

if k1>1

x＝x0+Xoffset/k1

y=y0+Yoffset/k1

else

x=x0

y=y0

2. Calculate the starting row, starting column, ending row, and ending column. Let the start behavior be Ystart, the start column be Xstart, the end behavior Yend, the end column be Xend, set the width and height of the screen displaying the preview data to be Width and Height respectively, and the zoom factor and center coordinates are set as above, then:

Ystart＝y-Height/(k1*2)

Yend＝y+Height/(k1*2)

Xstart＝x-Width/(k1*2)

Xend=x+Width/(k1*2)

After the above calculation, the print data position parameter to be previewed is obtained. If the data range exceeds the print data range according to this position parameter, the data beyond the range will be filled with the default non-picture data color.

The scaling factor is defined as follows: the data is not scaled, and the scaling factor is 1; the data is enlarged by 2 times, and the scaling factor is 2; the data is reduced by 2 times, and the scaling factor is 0.5.

Here, only integer multiple scaling is considered, as shown in Figure 7 for 2 times of enlargement, and as shown in Figure 8 for 2 times of zoom out.

The formula for calculating the pixel value when zooming out: (A1+A2+A3+A4)/4. That is, the average of the four pixel values.

By applying the invention, the printing function with print preview and print area selection can be realized in digital oscilloscopes and similar embedded devices. The printing method of the present invention will be described below with a specific example.

Use the area printing function

The steps are as follows: set the print area to screen in the print menu by pressing the key; set the print color to color; and then press the menu print key to start printing. As shown in Figure 3, after the system receives the software print start command, it first acquires print data according to the print area and data acquisition and overlay methods, and then converts the print data into data recognizable by the printer and prints it.

To use the print preview function, the steps are as follows:

1. Send the print preview command through the operation menu button;

2. After the system receives the print preview command sent by the user, it first obtains the print area settings, and then obtains the graphics card layer data according to the area settings and superimposes them into print data;

3. Get the default zoom factor, horizontal and vertical offset;

4. Calculate the data position information for preview in the print data according to the zoom factor, horizontal offset and vertical offset;

5. Construct preview data according to the calculated position information and zoom factor;

6. Display the preview data on the screen;

7. When the print preview function is executed, the screen display is as shown in Figure 9. At this point, you can operate the buttons for zooming in, zooming out, moving horizontally, and moving vertically, and repeat steps 4, 5, and 6 accordingly;

8. If the print button is operated, the printer will be driven to print; if the close button is operated, the preview state will exit.

In FIG. 9, 1 denotes a screen, 2 denotes a preview image, and 3 denotes an operation menu.

Claims (8)

1. one kind has that print in the zone and the Method of printing of Print Preview function, it is characterized in that may further comprise the steps:

1) regional printing step comprises:

1.1) receive the printing sign on that the user sends, start printing;

1.2) according to the print area that the user is provided with, from the video card data source, obtain the data set corresponding with print area and preserve parameter set metadata, the data set that obtains is carried out according to parameter set metadata figure is range upon range of to be added, generate print data and preservation;

1.3) print data is delivered to printer prints,

2) Print Preview step comprises:

2.1) receive user instruction, start preview operation;

2.2) according to the print area that the user is provided with, from the video card data source, obtain the data set corresponding with print area and preserve parameter set metadata, the data set that obtains is carried out according to parameter set metadata figure is range upon range of to be added, generate print data and preservation;

2.3) from print data, obtain the preview source data, the preview source data is converted into preview data and the preservation that meets the preview setting;

2.4) preview data is shown in preview interface;

Said step 1.2) and 2.2) in obtain data set and parametric technique thereof, may further comprise the steps according to zones of different:

If print area is a screen, then obtain video card physical map layer data and preservation at first from bottom to up successively, preserve simultaneously and respectively scheme the layer data parameter; Then according to coordinate and stack attribute according to physical map layer superpose the successively data of the same coordinate of different figure layers of order from bottom to up, the data of stack acquisition are print data,

If print area is a waveform, then obtain video card oscillogram layer data and preservation, can obtain print data.

2. the Method of printing with zone printing and Print Preview function as claimed in claim 1 is characterized in that:

Said step 1.2) and 2.2) in the print area that is provided with of user comprise screen area and wave regions, screen area is meant the zone that all show on screen, wave regions refers to only comprise in the print result waveform.

3. the Method of printing with zone printing and Print Preview function as claimed in claim 1 is characterized in that:

Said step 1.2) and 2.2) in the video card data source be meant video card physical map layer data; Video card has a plurality of physical map layers; Each figure layer carries different video datas; Be display data on the screen through the range upon range of show layers that adds generation of figure, its stack order is served as reasons the end upwards, and promptly Background From Layer is the bottom and the menu map layer is the superiors.

4. the Method of printing with zone printing and Print Preview function as claimed in claim 1 is characterized in that:

Said step 1.2) and 2.2) in data set be meant the data of from video card figure layer, obtaining according to print area.

5. the Method of printing with zone printing and Print Preview function as claimed in claim 1 is characterized in that:

Said step 1.2) with 2.2) in parameter set metadata comprise different video card figure layers with respect to upper left, the bottom right apex coordinate of the same coordinate system with scheme range upon range of additive attribute, the stack attribute comprise at least with or, XOR, covering.

6. the Method of printing with zone printing and Print Preview function as claimed in claim 1 is characterized in that:

When print area was screen, performing step was following:

Obtain each video card physical map layer data collection parameter, confirm the rectangle housing after the stack of figure layer data finishes;

According to rectangle frame coordinate and video card physical map layer, order is got same coordinate data and stack successively in each figure layer successively from bottom to up.

7. the Method of printing with zone printing and Print Preview function as claimed in claim 1 is characterized in that:

Step 2.3 during said Print Preview is realized) the preview setting described in comprises preview level, vertical moving and preview pantograph ratio at least;

Said step 2.3) method of from print data, obtaining preview data in comprises:

2.3.1) according to preview the positional information of calculating preview data with respect to print data is set;

2.3.2) successively corresponding print data is carried out convergent-divergent according to scaling according to the positional information that obtains, the data behind the convergent-divergent are preview data, said positional information comprises initial row, initial row and termination row, end column at least.

8. one kind has that print in the zone and the digital oscilloscope of Print Preview function, it is characterized in that comprising:

Front end signal conditioning unit, ADC, data processing unit, triggering processing unit, demonstration/control module, screen, keyboard and peripheral hardware; Wherein: the output of front end signal conditioning unit connects ADC and triggers processing unit; ADC is connected with the input of data processing unit; Trigger processing unit and be connected with the input of data processing unit, the output of data processing unit is delivered to screen through demonstration/control module, and keyboard and peripheral hardware connect demonstration/control module;

Signal is after nursing one's health through the front end numeral, and by the ADC sampling, ADC delivers to data processing unit with digitized signal and calculates, and data processing unit is delivered to screen display;

Described digital oscilloscope adopts claim 1,2,3,4,5,6 or 7 described methods to realize zone printing and Print Preview function.

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