JPH01233482A - Cursor movement control system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] Regarding a cursor movement control method in a graphic display device, the purpose is to update the cursor at high speed without being affected by the displayed figure, and to update the cursor at a predetermined period. When performing hit detection of the displayed figure using the cursor displayed, the current coordinates (Xi, Yt
), set a window CW+ ) of a predetermined size for
Performs cursor detection to check whether or not the coordinates of the cursor one cycle ago exist within one win set for the current coordinates of the cursor, and if the cursor is not detected, performs figure hit detection. The cursor coordinates are updated without doing this, and the cursor is detected at the cursor position in the next cycle.
The configuration is such that when the cursor is detected, the hit edge of the figure starts.

[Industrial application field]

The present invention relates to a cursor movement control method in a graphic display device.

[Conventional technology]

In conventional graphic hit detection using a cursor display, a program for displaying a graphic on a display is constantly analyzed to determine whether a graphic is present in the detection range of the cursor. Therefore, when the cursor passes over another figure different from the above-mentioned target figure while moving the cursor to the target figure, there is a problem that that figure will also be subject to hit detection. , since shapes other than the target shape are constantly being analyzed, time is wasted.

The conventional cursor control method described above will be explained below with reference to FIG. Reference numeral 2 in the figure indicates a display program, which is executed sequentially based on the address indicated by the display program counter 1. 3 is the analysis section of the Hokuki display program.

Since this configuration is not directly related to the present invention, it is safe to consider these three components as one display program. Therefore, in order to simplify the explanation hereinafter, the above three programs will be simply referred to as a drawing program.

4 is a differential analyzer (DDA), which calculates the X and X coordinate values (Px,
Py) is output.

The values of the X coordinate and the X coordinate are sent to the bitmap memory 5, and the X coordinate Px is sent to the comparators 9a and 9b.
The Y coordinate py is the a terminal of the comparators 9c and 9d.
sent to the terminal.

On the other hand, the cursor position data, ie, the center position coordinates X and Y of the cursor, are set in the cursor position register 6 -1, and this and the cursor sizes ΔX and Δy set in the cursor size register 7 are added and subtracted by addition circuits 88 to 8d. , coordinates Xmax, Xm1n of the upper right and lower left points of the window for cursor detection.

Ymax and Ymin are calculated, and the comparator 9
It is input to the b terminals of a to 9d.

This Xmax, Xm1n+ Ymax+ Ymin and Px input to the a terminal as the coordinates of the point to be drawn above.
, Py are compared by each comparator 9a to 9d, and
If max > Px > Xmin Ymax > P y > Ymin, the point exists within the window, and all four comparators 9a to 9d
is output.

At this time, all the inputs of the AND circuit constituting the hit detection section 10 are 1 degree, and although it is not shown in the figure, if the light ben presence/absence signal is "yes", the target figure has been hit by the cursor. A hit detection signal indicating this is output.

In this way, similar processing is continued for successive cursor positions until the target figure is hit.

Conventionally, the above-described processing has been performed on all figures on the display screen by analyzing the display program. This process is repeatedly performed on a path in which a cursor generated at a position specified by a light pen is moved to the position of a target figure, which results in wasted time, and this time becomes longer as the number of figures increases.

[Problems to be Solved by the Invention] As described above, in the conventional cursor control method, the time required to update the cursor includes the time required to analyze the displayed graphic. Then, a graphic analysis is performed every time the cursor position is updated, and this is repeated until the target graphic and the cursor position match. Therefore, the time required to update the cursor differs depending on the amount of shapes being displayed, which not only makes it take a long time to update the cursor (this time is undefined, but also improves the tracking ability of the cursor and the smoothness of the contrast shape). It inhibits human detection.

This phenomenon becomes a serious problem especially in cases where a large number of figures are displayed, such as in a graphic display.

Note that the hit detection process refers to determining whether a figure exists or not within the detection window corresponding to the cursor coordinates while analyzing the program.

An object of the present invention is to enable a cursor to be updated at high speed without being affected by displayed graphics.

[Means to solve the problem]

According to the present invention, if the amount of movement of the cursor is larger than a predetermined value while the cursor is moving, the comparison between the figure analysis data and the cursor is stopped, and the cursor is only updated without detecting a figure hit by the cursor. When the amount of change in the cursor coordinates becomes equal to or less than the predetermined value, the comparison between the graphic analysis data and the cursor is restarted to detect hits in the target graphic.

As shown in FIG. 1, the cursor control method according to the present invention sets the position of the moving cursor at regular intervals. In the same figure, ■ to ■ indicate the cursor positions at times t to t4 for each cursor detection period, expressed as (the time required to generate one screen Xn, where n=1.2, 3, . . . ). Let this cursor position coordinate be (X, , Yi). Here i
=1 to 4.

A window Wi of a constant size centered at the cursor position (X4.Yi) at each of the above times is set. In the figure, as shown by the dotted line, this window W1 is (X+ ±
Δχ, Yt±Δy).

Now, the moving cursor is set to the position of ■ at time t, and then after a certain period of time at time t2, it is set to ■.
Assume that it is set at the position.

The distance between these two is investigated, and the method for doing so is, for example, using the window W2 at time t2 and the window W2 at time t1.
The coordinates of ■ (X, , Y
Check whether or not i') is included in the window W2 in ■. Since it is not included in the illustrated example, similar detection processing is executed at times t3 to t4 on the assumption that the cursor has moved a predetermined distance or more.

At time t4, the cursor coordinates (x
l, Y3) is included in window W4, so
It is detected that the amount of movement of the cursor has become less than a predetermined value. In this case, it is assumed that the cursor movement has almost finished and the target figure has been approached, and the comparison between the figure analysis data and the cursor is restarted to perform hit detection.

[Function] If the cursor movement amount is larger than a predetermined value, it is assumed that the cursor is moving without reaching the target shape, and only the cursor position data is used without comparing the shape analysis data and cursor coordinate data. Update sequentially. Therefore, the time conventionally required to analyze displayed graphic data is no longer necessary, so the cursor update time becomes independent of the amount of displayed graphics, and the cursor is updated faster.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In this embodiment, in contrast to the conventional configuration shown in FIG.
cursor position register 11 and two selectors 12a
, 12b are attached, and the hit detection section 10 is further composed of AND circuits 13, 14, 15 and an inverter 16.

The first cursor position register 6 contains the set current cursor position coordinates Xi, as in the conventional case.

Yl is stored, and the coordinates of the previous cursor position are X, -
, ,Yi-, are stored in the second cursor position register 11.

The selectors 12a and 12b select the DDA based on the selection signal.
4 (hereinafter referred to as figure analysis data) and the X, Y coordinates output from the second cursor position register 11, the a terminals of the comparators 9a to 9d are selectively used. This is a selection means for sending to. In this embodiment, the display program busy signal is used as the selection signal, and when this signal is "1", the selector 1 is
2a and 12b are graphic analysis data, and when they are "0", the output of the cursor position register 11 is selected.

The hit detection section 10 conventionally consisted of only an AND circuit 13, but instead of an AND circuit 14 which performs an AND operation between the output of the AND circuit 13 and the selection signal. and AND circuit 1
3 and an AND circuit 15 that performs a logical product operation of the selection signal and a signal inverted by an inverter 16, and the output of the AND circuit 14 is used as a hit detection signal, and the
The output of the D circuit 15 is sent to the display program counter 1 and the display program analysis section 3. In other words, it is a stop signal for stopping the drawing program. While this stop signal is being output, the drawing program stops operating and the selection signal, which is one input of the AND circuit 14, becomes 0', so no hit detection signal is output.

Other configurations are the same as the conventional configuration shown in FIG. 2.

The operation of this embodiment configured as described above will be explained with reference to FIGS. 1 and 2.

During normal drawing, the selection signal is 1°, so the selectors 12a, 12b output the graphic analysis data output from the DDA 4 to the bitmap memory 5, and also to the comparators 9a, 9b, 9c, 9d.

After writing all the data to the bitmap memory 5, if there is no change in the data, the drawing program stops operating and the selection signal becomes "0".Therefore, the output of the AND circuit 14 is 0°, that is. The hit detection signal is not output.Also, until the light pen (not shown) is pressed against the screen to display the cursor, the light pen presence/absence signal will be '0' (
Since the output of the AND circuit 15, ie, the stop signal, is also 0', the cursor update mode is entered.

Note that even in this mode, the graphic display on the screen continues.

Even while the graphic analysis data is being output from DDA4,
When the light pen is pressed against the display screen, the cursor position at that point is set in the cursor position register 6 in synchronization with the cursor position set signal, and the window calculated based on the set coordinate values and output from the DDA The above-mentioned graphical analysis data obtained by
compared in. However, since this data does not normally exist within the window, the output of the AND circuit 15, that is, the stop signal becomes 0, and the operation of the drawing program is stopped. Therefore, the selection signal becomes 0°, and the cursor update mode is entered.

In the cursor update mode, when the cursor moves toward the target figure, the cursor is detected as expressed by [time required to generate one screen] x n (where n = 1.2°3,...) The cursor position (Xi, Yt) at each time t is set in the cursor position register 6 in synchronization with the cursor position set signal outputted every cycle.

For the above coordinate values, the cursor size (ΔX) is preset in the cursor size register 7.

Δy) is added by adders 8a and 8c, subtracted by adders 8b and 8d, and sent to the b terminals of comparators 9a to 9d, respectively.

When the selection signal becomes 0, the selectors 12a and 12b are in a state of taking in the output of the cursor position register 11 instead of the graphic analysis data.

The position coordinates set in the cursor position register 6 are transferred to the cursor position register 11 in synchronization with the cursor position set signal. That is, cursor position register 6
When the position coordinates (Xi, Yi) are set, the time t is set in the cursor position register 11.
The cursor position coordinates of i-1 (Xi-1, Yt-,) are set.

Therefore, the b terminals of the comparators 9a to 9d have the time t.
The coordinates of the four corners of window w5 in , X i#mX+
X i#i*+ Y i@IjX+ Y 1m1n is input, and the position coordinates of the cursor at time j i-1 (X, -,.

Yt-9) is input, and it is detected whether (Xi-+, Yt-+) is within the current window W8.

The time is also the position coordinate of the cursor at -8 (Xi-r+
Yi-, ) does not exist within the current window wi, the output of the AND circuit 13 becomes "0", so no hit detection is performed and the stop signal also remains at "0".

Therefore, the cursor update mode continues, no analysis of the drawing program is performed, and only cursor updates are executed. This is a case where the cursor is determined to be moving because the cursor has moved a long distance.

The time is also the position coordinate of the cursor at -1 (Xi-,.

If Y+-5) exists within the current window W, the output of the AND circuit 13 will be 1°, so the AND
The output of the circuit 15, that is, the stop signal becomes 1°, the analysis of the drawing program is restarted, and the selection signal becomes "1", so the selectors 12a and 12b switch to the figure analysis data side, and the cursor update mode ends. is the state at time t4 in FIG. 1, and within window 4,
There is a cursor position (■ in the figure) at the time mark. In this case, the amount of cursor movement from time t to time t4 is very small, and since it has approached the desired target figure, it is assumed that the cursor has almost stopped, and the hit detection of the target figure is performed. In order to execute this, switch to the mode that analyzes the drawing program.

In this mode, as in the conventional case, the figure analysis data is compared with the window W at that time, and if the target figure exists within the window, the AND circuit 14 outputs a hit detection signal.

As described above, in this embodiment, when the cursor is moving, the display program counter 1 and the display program analysis section 3 are stopped to interrupt the analysis of the drawing program. Therefore, in this mode, the cursor coordinates are updated at regular intervals without being affected by the amount of figures to be drawn. FIG. 3 is a diagram showing the flow of data in the cursor update mode of the embodiment, and the thick double line in the figure is the flow of data in the cursor update mode.

Next, when it is determined that the cursor has stopped, the operation of one display program counter is restarted, the selector selects the graphic analysis data, and detects a hit of the target graphic. The data flow in this case is shown in FIG. 4 by a thick double line.

Note that the window here refers to the range in which it is determined that the cursor movement has stopped, and in the embodiment of the present invention, this window is a detector for detecting figure hits (
It goes without saying that window hardware may also be provided separately.

〔Effect of the invention〕

As explained above, according to the present invention, unnecessary figure analysis is not performed while the cursor is moving, so the cursor movement becomes faster and the hit operation of the target figure becomes easier.
Improves work efficiency.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of the present invention, Fig. 2 is an explanatory diagram of an embodiment of the present invention, Fig. 3 is a diagram showing the flow of data in the cursor update mode of the above-mentioned embodiment, and Fig. 4 is an illustration of the above-mentioned embodiment. FIG. 5 is a diagram showing the flow of data during the human detection operation of the embodiment. FIG. 5 is a diagram illustrating problems in conventional human detection. In the figure, x,,y, are the current coordinates of the cursor, x! −
,, Yl-+ is the cursor coordinates one cycle ago, W is the window set for the current coordinates of the cursor, 1 is the display program counter, 2 is the display program, 3 is the display program analysis section, 4 is DDA, 5 is bitmap memory, 6 and 11 are cursor position registers, 7 is cursor size register, 8a, 8
b, 8c, 8d are adders, 9a to 9d are comparators,
10 is a human detection unit, 12a. 12b is a selector, 13 to 15 are AND circuits, and 16 is an inverter. Figure 1

Claims (1)

[Claims] When performing hit detection on a displayed figure using a cursor displayed at predetermined intervals, a window (W_i) of a predetermined size is set for the current coordinates (X_i, Y_i) of the cursor. The coordinates of the cursor one cycle before (X
_i_-_1, Y_i_-_1) exists, and if the cursor is not detected, the cursor coordinates are updated without detecting a figure hit and the cursor is moved to the next cycle's cursor position. A cursor movement control method characterized in that the cursor movement control method is configured to perform detection and, when a cursor is detected, start detecting a hit of a figure.