SU479106A1 - Device for displaying graphic information - Google Patents

Description

one

The invention relates to computing and can be applied in computer aided design systems for converting digital information at the output of an electronic computer into drawings and other forms of technical documentation.

Devices for outputting graphical information are known, comprising a serially connected computer, an input control unit, a pulse generator, a recording unit and a printing unit, the recording unit and the printing unit being connected to the computer.

The conversion of digital information into a graphic form of drying is implemented in the start-stop mode by successively mixing, registering, its organ, which is a head with feathers of various thickness, in accordance with the outline of the drawing element.

The purpose of the invention is to provide a high speed of drawing the device, an increase in the number of types of lines in thickness, constancy of density and thickness and line of recording under conditions of line-by-line formation of the drawing.

This is achieved by the fact that the proposed device contains an ordinate displacement unit, a scanning unit, an interface unit, and an approximation unit connected to the computational unit.

a machine, wherein the scanner is connected to the ordinate mixing unit, the conjugation unit and the approximation unit, connected to the ordinate displacement unit, the pulse generator,

a recording unit and an interface unit connected to the input control unit.

The drawing shows a block diagram of the proposed device.

It contains an ordinate offset block 1,

the register 2 of the initial ordinate, the register 3 of the current ordinate, the registers 4 intermediate ordinates and the control circuit 5; a sweep unit 6 comprising a pulse generator 7, a sweep generator 8, a limiter 9, a final abscissa register 10, a current abscissa counter 11, a comparison circuit 12 and an OR 13; approximation unit 14, which includes a reversible counter-register 15 of the beginning of the segment, a register 16 of the end of the segment, a comparison circuit 17 and an analyzing circuit 18; an interface unit 19 comprising a backup register 20, a register 21 of a given thickness, a counter-register 22 of the current thickness, a comparison circuit 23 and a logic circuit 24; block 25

records; input control unit 26; pulse generator 27; print unit 28; computer machine (VM) 29.

The device works as follows. In each scan current information

considered: drawing element from VM

enters the displacement block I, which serves to form the required thickness along the abscissa axis. For this purpose, the displacement block contains registers whose number is equal to Г U –г 1 (where ГУ is the required maximum thickness of the circular or inclined straight arc). The initial and intermediate ordinates in the VM memory cells are assigned a corresponding number of bits, from which, respectively, registers 2 and 4 receive information at the beginning of each element in the current row (scan), and register 3 receives the current ordinate from the computer . Registers 2 and 3 of the initial and current ordinates provide information through the approximation block 14 for registration. If the element in the row in question does not end, the information from registers 2, 3 and 4 of the initial, current and intermediate ordinates is sent via the control circuit 5 to the operational network. When information is sent to the RAM by the control circuit 5, the current ordinate is shifted through registers 4 to the register 2 of the initial ordinate, with the required number of steps for getting the current ordinate in register 2 to be equal to the specified thickness. For this purpose, a code of a given thickness and a code defining the type of the element are received from the VM into the control circuit 5. Thus, each ordinate is recorded in T lines (where T is the number that determines the required thickness).

In the formation of the thickness of a point, a vertical or horizontal line, the block is offset and does not participate. In these cases, the boundary ordinates come from the VM to the analyzing circuit 18 in the corresponding sweeps, and the number of thicknesses is determined by the resolution of the register 21 of a given thickness and the counter-register 22 of the current thickness.

In order for the last sections of the arc of a circle or inclined straight to obtain the required thickness, it is necessary to register the ordinates constituting the last segment of the element, begin with some advance, in particular with the sweep Hsch, which is defined by the expression

 IK - ishs- (-1)

where make is the abscissa of the end point of the element;

T - given thickness. To determine the time of occurrence of the sweep X, the sweep block 6 is designed. For this purpose, a code of a given thickness and a code defining the type of element are transferred from VM to limiter 9, and to the register 10 - the abscissa of the end point of the element. In each sweep, the pulse from the output of the sweep generator 8 through the scheme “OR 13 enters the counting input of the counter 11 and sets in it the number of the current line. In addition, for each element pulses with

the output of the generator 7 is supplied to the limiter 9, which passes the number of i.pulses to the input of the counter 11 through the scheme OR 13 (G-1).

After the addition of these pulses, the contents of counter 11 become X + (T-1). Using the comparison circuit 12, this number is compared with the final abscissa of the element, and in the case of equality,

X 1+ (T-1) A mcg

whence X / A „ax- (G-1) X, where X f is the current line number.

At this time, the scanning unit 6 fixes

The moment of the beginning of working off the last segment of the element. If the element being worked is inclined, then according to the signal received from the sweep block 6, in the computing device of the machine, depending on the

A few lines earlier, the ordinate of the end point of the element is calculated, and it is transferred to the offset unit 1 as the current ordinate. In the case of a circle or arc, in the block 14 approximation, the ordinate of the center Uc or the ordinate of the control point of the end point of the arc is considered the current ordinate.

The sign of working off the last segment of

scanner unit 6 is sent to the VM operational memory, and in subsequent lines this feature from the machine’s memory will be sent to approximation unit 14.

From the recording line require constant

density and no gaps. The density of points along the contour can be estimated as the ratio of the number of points in the area to the length of this area. Consequently, with a line by line formed element, the density of points on

the contour varies according to the expression

;

where / is the length of the section corresponding to a single axis along the X axis;

t - the number of points in this area. In the case when a single-thickness line is processed, with a uniform movement along the abscissa axis, each movement along

50 axis X corresponds to one point on the line being worked. However, the length of the section of the line to be processed, which corresponds to one step along the abscissa, varies depending on the angle of inclination of the section being worked out, and

55, respectively, the density of points along the contour varies according to the expression.

one

/ -

;

60 For an oblique, direct density of points is expressed by

eleven

/ 1- -DK2Kl-hfla

When working out a single circle tol65

If the movement along the X axis is from the intersection point with a horizontal diameter, i.e., a diameter parallel to the x-axis, in the direction of the center, the increment of the ordinate varies according to the expression

DU (| /,,

where R is the radius;

p 1, 2, 3, 4, ... - the number of step along the axis

abscissa.

Replacing the arc corresponding chord, get the density of points along the contour in the case of an arc or a circle equal to

eleven

i yy--

V 1 1+ (/ l-Kp.-1)2. (

Thus, for the circle in the first interpolation step, the density is minimal, and the angular coefficient of the tangent has a maximum value.

Further, the density increases, and the angular coefficient of the tangent decreases.

The approximation unit 14 serves to obtain the same density of points along the loop to be processed, regardless of the angle of inclination of the strip being worked.

Under conditions of high resolution of the registering authority, i.e., with a small schag between the recording elements, density is achieved by approximating the line being worked up by vertical segments (i.e., segments parallel to the ordinate axis) with a length of

DU Y2-Yb where Y2 - the value of the ordinate at the current point

practicing in steps;

Y - the previous value of the ordinate in schagah.

To accomplish the above, the initial and current ordinates Y and U are received from the displacement block 1 from the displacement block 1, and the code defining the element type, the arc center or circle ordinate, the end arc of the arc, the number of the quadrant in which the current point is arc or circle, and the sign of the slope of the slope. Analyzing circuit 18, depending on whether the ordinate increases or decreases in the area being worked out, determines the largest of the numbers V2 and V) and sends it to the end register 16 of the segment, and the smaller of them to the reversible counter-register 15 of the beginning of the segment. On the counting input of the reversible counter-register 15 receives the clock pulses from the block 25 records.

Each of them adds a unit to the contents of the counter-register 15, the outputs of which are connected to the recording unit.

Since U „ac of each segment coincides with the UKON of the previous segment, with a sufficiently small schag on the abscissa, the end point of each segment coincides with the beginning of the next segment. The outcome of this is that

on a segment of length LU, the number of points AU, i.e., the density of points is constant and equal

m l Y

l y

Do

where DU is the length of the segment, expressed in steps. The conjugation unit 19 serves to form the required thickness along the axis of ordinates, as well as to correctly orient the thickness lines relative to the baseline of the mining (interpolation line) and provides the possibility of conjugation of different elements.

When drawing thick lines, one should distinguish between the baseline of the mining (interpolation line), the interpolation on which reference points are made, and the thickness lines: lines drawn to the baseline .IHHHH for

obtain a given thickness. In order to allow the matching of different elements and accuracy, it is necessary to correctly determine the orientation of these lines relative to each other. For sloping straight lines

the edge more distant from the ordinate axis is taken as the baseline for mining, the edge closest to the ordinate axis is for the vertical segments, the edge for the horizontal straight lines is

to the abscissa axis, for the circles and arcs - the outer edge.

The recording of vertical segments (Good luck to the UKON) that approximates the circuit being worked out should be carried out in such a way

so that one end of the segment is on the baseline and that the segment intersects all lines of thickness. To do this, from the analyzing circuit 18, the initial ordinate YAch, enters the reversible counter-register 15 and the reserve

register 20. A clock is recorded in recording unit 25. At the same time, these pulses are passed to the inputs of the reversible counter-register 15 and the counter 22 of the current thickness.

When the segment AU (Uton-Unach) T, the comparison circuit 23 generates an equality signal

GG,

where G is a given crowd.1, ina;

Tf- current thickness 1a.

This signal is recorded in the Tpnrrojic (lui drawing not shown), logic circuit 24 is also supplied, and after the arrival of the equality signal from comparison circuit 17, which is also recorded in a trigger (not shown), logic circuit 24 stops recording and sends to VM request for the next item. In the case when, the equality signals simultaneously G o are output at the circuits 17 and 23.

If the length of the vertical section of the linac is such that it does not intersect all the thickness lines, i.e., by the time when the comparison circuit 17 produces a signal

signifying equality of the contents of the reversible Iioio counter-register 15 and register 1b, there will be no equality signal at the output of the circuit by sprince 23. However, due to the need to obtain a given thickness, but the ordinate axis does not stop until the equal signal at the output of the comparison circuit 23. In the case of a sloping straight line with a positel angular coefficient or an arc located in the third or fourth quadrant, the reversible counter-reg. 15 continues to work on addition, and in the case of a slope straight with a negative angle In the first or second quadrants, at the time of occurrence of the equipotent signal at the output of the comparison circuit 17 and under the condition of G - Tf, the logic circuit 24 rewrites the initial ordinate V & n from the backup register 20 to the reversible counter-register 15 and switching to the last subtraction.

In this way, the thickness lines are oriented relative to the baseline of the mining, which makes it possible to couple different elements.

Block 26 controls the entry of information and the launch of a pulse generator 27.

The printing unit 28 contains a permanent memory sub-block with which a sign configuration is defined. To reproduce the mark from VM, block 28 receives the sign code of the mark, its code, the register code to which the sign belongs, the sign of the orientation and the current sweep. Characters may be reproduced in drawing mode and in print mode. In the drawing mode, for each character from the VM, the reversible counter register 15 receives the ordinate of the left upper vertex of the reproduction area of the sign. To separate words in a string, use the sign

"Space, and L1 of znacs 1e |) Asssto 1P1 uchennP) are abacus

To build a function with the marking of curves but the thickness from the VM, the information of the graph must be given as a set of points of the corresponding thickness. In addition, the curve can be approximated by arcs, inclined straight or vertical segments, limited by the current and previous ordinates. In order to always thicken the curve on one side of the graph, a special attribute must be received from the VM to the sonar block 19, which determines the position of the thickness lines relative to the baseline. Otherwise, the reversible counter-register 15 will always work in one direction (in addition), and the position of the thickness lines relative to the baseline may vary in

points of change in the sign of the angular coefficient of the tangent, which must be considered when counting data.

Subject invention

25

A device for outputting graphical information, comprising a serially connected computational mask, an input control unit, a pulse generator, a recording unit and a non-propeller unit, wherein the recording unit and the printing unit are connected to the computational mask, characterized in that, in order to increase the speed of the device,

an ordinate offset unit, a scanner unit, an interface unit, and an approximation unit connected to the computer are entered in it, the scanner unit being connected to the ordinate displacement unit, the interface unit and

an approximation unit connected to the ordinate displacement unit, generator of impulses, a recording unit and a connector unit connected to the input control unit.