| 摘要 |
To enable the drawing of a curve which is made to have an appropriate width to display scanning through a simple calculation process without using a frame buffer. A coordinate calculating unit 2 calculates a coordinate to be drawn from an expression of an original curve inputted thereinto. A horizontal broadening unit 4 performs a calculation for horizontal broadening that is implemented on the original curve. A vertical broadening unit 5 performs a calculation for vertical broadening that is implemented on the original curve and conversion to a horizontal vector. A selecting unit 6 switches between the usage of a result of a calculation by the horizontal broadening unit 4 and the usage of a result of a calculation by the vertical broadening unit 5 based on an inclination of a tangent which is calculated in an inclination calculating unit 3. An output unit 8 outputs an image signal of each pixel to scanning of a display screen. With this configuration, it becomes possible to draw a curve which is made to have a width relative to an original curve.
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