JPS57182232A - Method and device for generating quadratic curve signal - Google Patents

Method and device for generating quadratic curve signal

Info

Publication number
JPS57182232A
JPS57182232A JP6579581A JP6579581A JPS57182232A JP S57182232 A JPS57182232 A JP S57182232A JP 6579581 A JP6579581 A JP 6579581A JP 6579581 A JP6579581 A JP 6579581A JP S57182232 A JPS57182232 A JP S57182232A
Authority
JP
Japan
Prior art keywords
point
quadratic curve
directions
curve signal
coefficients
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6579581A
Other languages
Japanese (ja)
Inventor
Chuya Inoue
Takao Asaka
Yuji Yamaguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokogawa Electric Corp
Original Assignee
Yokogawa Electric Corp
Yokogawa Hokushin Electric Corp
Yokogawa Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokogawa Electric Corp, Yokogawa Hokushin Electric Corp, Yokogawa Electric Works Ltd filed Critical Yokogawa Electric Corp
Priority to JP6579581A priority Critical patent/JPS57182232A/en
Priority to US06/365,938 priority patent/US4484298A/en
Publication of JPS57182232A publication Critical patent/JPS57182232A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Data Mining & Analysis (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Computational Mathematics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Algebra (AREA)
  • Image Generation (AREA)

Abstract

PURPOSE:To draw a smooth curve at a high speed, by generating quadratic curve signal in non-parametrically based on the primary differential coefficients fx and fy in the directions of X and Y at a point (x, y). CONSTITUTION:The primary differential coefficients in the directions of X and Y at a point P (x,y) are designated as fx and fy. The magnitude and sign of the coefficients fx and fy are compared with each other. Hereupon, a circle on which the point P lies is considered, and it is judged that in which part does the point P lie when the circule is equally divided into eight. Then, two points which are to be selected next by the point P are selected from each part. New locations G0 and G1 of the point P when each point is selected is obtained. The smaller value among those values,¦G0¦and¦G1¦, is used as the true next location. These processings can be realized when an arithmetic unit controlled by a microcomputer and plural data register are used.
JP6579581A 1981-04-30 1981-04-30 Method and device for generating quadratic curve signal Pending JPS57182232A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP6579581A JPS57182232A (en) 1981-04-30 1981-04-30 Method and device for generating quadratic curve signal
US06/365,938 US4484298A (en) 1981-04-30 1982-04-05 Method and device for generation of quadratic curve signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6579581A JPS57182232A (en) 1981-04-30 1981-04-30 Method and device for generating quadratic curve signal

Publications (1)

Publication Number Publication Date
JPS57182232A true JPS57182232A (en) 1982-11-10

Family

ID=13297317

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6579581A Pending JPS57182232A (en) 1981-04-30 1981-04-30 Method and device for generating quadratic curve signal

Country Status (1)

Country Link
JP (1) JPS57182232A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186385A (en) * 1987-01-28 1988-08-01 Mita Ind Co Ltd Elliptical pattern generator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON COMPUTERS=S48US *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186385A (en) * 1987-01-28 1988-08-01 Mita Ind Co Ltd Elliptical pattern generator

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