Drawing apparatus with drawing data correction function

A storage device that stores a program executable by a computer for correcting drawing data representing a drawing pattern to be drawn in a quadrangular drawing area of a drawing subject, the storage device comprising:

• an ideal position determining code segment that determines an ideal position of the quadrangular drawing area based on a position of the quadrangular drawing area before the drawing subject is transformed, wherein an ideal outline is an outline of the quadrangular drawing area in the ideal position;
• an actual position determining code segment that determines an actual position of the quadrangular drawing area based on a position of the quadrangular drawing area after the drawing subject is transformed, wherein an actual outline is an outline of the quadrangular drawing area in the actual position;
• and
• a data corrector code segment that corrects the drawing data to be corrected drawing data, where a corrected outline, comprising an outline of the quadrangular drawing area represented by the corrected drawing data, is a parallelogram which has two neighboring sides that are the same as two neighboring sides of the actual outline, one of the two neighboring sides of the corrected outline overlapping a side of the ideal outline.

A drawing data correcting method for correcting drawing data representing a drawing pattern to be drawn in a quadrangular drawing area of a drawing subject, the method comprising:

• determining, with a computer, an ideal position of the quadrangular drawing area based on a position of the drawing area before the drawing subject is transformed, an ideal outline being an outline of the drawing area in the ideal position, original drawing data corresponding to the ideal outline;
• determining, with a computer, an actual position of the drawing area based on a position of the drawing area after the drawing subject is transformed, an actual outline being an outline of the drawing area in the actual position;
• calculating, with a computer, a second transformed drawing area outline based on the actual outline by converting coordinates of the actual outline so that a vertex of the actual outline corresponds to an origin of a drawing-coordinate system;
• calculating, with a computer, an x-axis scaled drawing area outline based on the second transformed drawing area outline by gradually scaling the second transformed drawing area outline in an x-axis direction of the drawing-coordinate system;
• calculating, with a computer, a first transformed drawing area outline based on the x-axis scaled drawing area outline by gradually scaling the x-axis scaled drawing area outline in the x-axis direction and in a y-axis direction of the drawing-coordinate system;
• calculating, with a computer, a scale changed drawing data based on the original drawing data by scaling the original drawing data to correspond to a scale of the first transformed drawing area outline;
• calculating, with a computer, a first corrected drawing data based on the scale changed drawing data by applying a sloping correction method to the scale changed drawing data so that the first corrected drawing data corresponds to the first transformed drawing area outline;
• and
• calculating, with a computer, a second corrected drawing data based on the first corrected drawing data by applying a gradual scaling correction method to the first corrected drawing data so that the second corrected drawing data corresponds to the second transformed drawing area outline,
• the first transformed drawing area outline being a parallelogram with two neighboring sides that are the same as two neighboring sides of the actual outline, with one of the two neighboring sides of the first transformed drawing area outline overlapping a side of the ideal outline, and
• the second transformed drawing area outline being congruent with the actual outline.