Image processing apparatus, image processing method, and program

7:

• An image processing method comprising:
• storing, in a three-dimensional space information storage unit, a position of a cross-sectional plane in a three-dimensional space;
• projecting and drawing the cross-sectional plane in the three-dimensional space onto a projection plane on the basis of information on the position of the cross-sectional plane stored in the three-dimensional space information storage unit;
• detecting a slide operation to cause a point to slide on a screen on which the projection plane is drawn, and acquiring information on a position on the screen at which the slide operation is performed;
• deciding a reference guide rail existing near a position of the slide operation when a guide rail intersecting the cross-sectional plane in the three-dimensional space at a predetermined angle is projected onto the projection plane on the basis of the information on the position of the slide operation acquired;
• calculating a two-dimensional motion vector, which represents a movement on the screen and is parallel to the reference guide rail, on the basis of a direction of the slide operation and an amount of movement when the slide operation is performed;
• calculating a three-dimensional motion vector representing a direction of movement and an amount of movement in the three-dimensional space corresponding to a two-dimensional motion vector existing on the projection plane;
• and
• changing the position of the cross-sectional plane in the three-dimensional space stored by the three-dimensional space information storage unit in accordance with the calculated three-dimensional motion vector.

8:

• A non-transitory computer readable storage medium that stores a computer program, which causes, when executed by a computer, the computer to perform an image processing method comprising:
• storing, in a three-dimensional space information storage unit, a position of a cross-sectional plane in a three-dimensional space;
• projecting and drawing the cross-sectional plane in the three-dimensional space onto a projection plane on the basis of information on the position of the cross-sectional plane stored in the three-dimensional space information storage unit;
• detecting a slide operation to cause a point to slide on a screen on which the projection plane is drawn, and acquiring information on a position on the screen at which the slide operation is performed;
• deciding a reference guide rail existing near a position of the slide operation when a guide rail intersecting the cross-sectional plane in the three-dimensional space at a predetermined angle is projected onto the projection plane on the basis of the information on the position of the slide operation acquired;
• calculating a two-dimensional motion vector, which represents a movement on the screen and is parallel to the reference guide rail, on the basis of a direction of the slide operation and an amount of movement when the slide operation is performed;
• calculating a three-dimensional motion vector representing a direction of movement and an amount of movement in the three-dimensional space corresponding to a two-dimensional motion vector existing on the projection plane;
• and
• changing the position of the cross-sectional plane in the three-dimensional space stored by the three-dimensional space information storage unit in accordance with the calculated three-dimensional motion vector.