US 4,875,033 AGranted

Graphics input apparatus

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsKiyotaka Kato, Michitaka Oshima

Life of this patent

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Abstract

The graphics input apparatus enables an operator to input a two or three-dimensional schematic figure into a computer simply by hand-writing a two-dimensioanl figure in a picture plane of a display device such as a cathode ray tube. The graphics input apparatus is provided with a display device, a memory, a position indicator for indicating predetermined positions in the picture plane of the display device, and a cursor display for displaying a cursor at the position indicated by the position indicator. Element inputting means displays a starting point at the indicated position of the cursor, assigning a specified node number to a node in the vicinity of the starting node if the node has not been specifically numbered, storing the node number in memory, displaying the elements at the position to which the cursor is moved by the position indicator, further displaying an ending point, assigning a specified node number to a node in the vicinity of the ending point if the node is not already numbered, storing the node number of the nodes in the vicinity of the ending point and making the memory store information on connection between the starting point and the ending point. Shape recognition means recognizes the shape of the elements in a predetermined manner.

Claims27

Dependent claims

A graphics input apparatus, which includes:

memory means;
display device means capable of displaying a figure in a picture plane having m.times.N pixels;
positions indicating means for indicating predetermined positions in the picture plane of said display device means;
cursor displaying means for displaying a cursor at the positions indicated by said position indicating means;
element inputting means for executing a first step of displaying at the display position of said cursor a starting point of elements forming the figure to be drawn in the picture plane of said display device means as a starting node, a second step of storing in said memory means a node number of a node if the numbered node is present in the vicinity of the starting node, or of assigning a specified node number to a node if there are no nodes already numbered present in the vicinity of the starting node and storing the specified node number in said memory means, a third step of displaying pixels at the display positions of said cursor indicated by said position indicating means from the position of the starting node as an element, a fourth step of displaying an ending point of the element at the display position of said cursor as an ending node, a fifth step of storing a node number of a node if the numbered node is present in the vicinity of the ending node, and of assigning and storing a specified node number to a node if there are no nodes already numbered present in the vicinity of the ending node, and a sixth step of storing information between the starting node and the ending node;
and
shape recognition means for recognizing the shape of the element is a predetermined manner.

4 more elements

A graphics input apparatus, which includes:

memory means;
display device means capable of displaying a figure in a picture plane having M.times.N pixels, position indicating means for indicating predetermined positions in a picture plane of said display device means;
cursor displaying means for displaying a cursor at the positions indicated by said position indicating means;
inter-node connection inputting means for executing a first step of displaying at the display position of the cursor one end of an edge to be drawn in said picture plane as a node, a second step of storing in said memory means a specified node number of a numbered node if the numbered node is present in the vicinity of the end displayed as a node, or of assigning a specified node number to a node if there is no numbered node in the vicinity of the end displayed as a node and storing the node number of the end displayed as a node, a third step of displaying the pixels of the picture plane at the positions of the cursor moved from the end by said position indicating means as an edge and also assigning a specified edge number to said edges and storing the edge number of the numbered edges in said memory means, a fourth step of displaying at said display position of the cursor the other end of said edge as a node, a fifth step of assigning the node number of the predetermined node to a node if the numbered node is present in the vicinity of the other end displayed as a node, or of assigning a specified node number to another node and storing the specified node number in said memory means if no numbered node is present in the vicinity of the other end displayed as a node, and a sixth step of storing information on the connection between the node in said second step and the node in said fifth step;
and means for storing data of faces defined by the nodes and edges, the number of the nodes, and the edge numbers of edges as information on the faces.

2 more elements

A graphics input apparatus, which includes:

memory means;
display device means capable of displaying a figure in a picture plane having M.times.N pixels;
position indicating means for indicating predetermined positions in the picture plane of said display device means;
cursor displaying means for displaying a cursor at the position indicated by said position indicating means;
inter-node connection inputting means for executing a first step of displaying at the display position of the cursor one end of edge to be drawn in the picture plane as a node, a second step of storing in said memory means a specified node number to a node to which the specified number has been already assigned is present in the vicinity of the one end displayed as a node, or of assigning a specified node number to a node if there is no numbered node in the vicinity of the one end displayed as a node and storing the node number of the node in said memory means, a third step of displaying said pixels in the picture plane at the position of the cursor moved from the one end of said position indicating means as an edge and also assigning a specified number to the edge and storing the edge number of the edges in said memory means, a fourth step of displaying at said display position of the cursor the other end of the edge as a node, a fifth step of assigning a node number of a numbered node to the node displayed in the fourth step if the numbered node is present in the vicinity of the other end displayed as a node, or of assigning a specified node number to the node displayed in the fourth step if numbered nodes are present in the vicinity of the displayed node and of storing the specified node number of the displayed node, and a sixth step of storing information on the connection between the node in said second step and the node in said fifth step;
and
means for executing a seventh step of calculating data of trees, an eighth step of adding one corresponding branch to each of the trees to calculate each loop, a ninth step of storing data of the loops as data of faces, and a tenth step of storing the number of the nodes and the number of said edges as data of the faces.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/057,032Filed 2 Jun 1987
Priority: JP 61-1291975 Jun 1986
Granted: 17 Oct 1989
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G06T 11/23
Drawing from basic elements: using straight lines or curves
G05B 19/40932
Concerning programming of geometry: shape input
G06F 3/04845
For the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a…:…
G05B 2219/35064
Nc in input of data, input till input file format: transform sketch by replacing free curves with mathematical curves, two display