Display apparatus and non-transitory computer-readable storage medium storing display control program

1. A display apparatus, comprising:

a display changeable to a plurality of states including a folded state in which the display is folded along a boundary between a first display area and a second display area and the first display area and the second display area face in opposite directions and an unfolded state in which the first display area and the second display area face in a same direction without the display being folded along the boundary;

a processor that determines an orientation and a state of the display and controls displaying of a page image on the display according to the orientation and the state of the display,

in a state of displaying an image file including a first page image representing a first page and a second page image representing a second page that is a next page of the first page, the processor switching between a first display state in which the first page image is displayed across the first display area and the second display area while the display being in the unfolded state and a second display state in which the first page image is displayed on the first display area and the second page image is displayed on the second display area while the display being in the folded state in response to a user changing the state of the display between the folded state and the unfolded state,

the processor selectively executing, according to whether the first page image is in portrait orientation or in landscape orientation, one of a first mode in which the first display state and the second display state are switched in response to the user changing the state of the display between the folded state and the unfolded state and a second mode in which the second display state and a third display state in which the first page image and the second page image are displayed on the first display area and the second display area while the display being in the unfolded state are switched in response to the user changing the state of the display between the folded state and the unfolded state,

the processor displaying the first page image on the display in the first display state so that the first page image has a larger size than in the third display state,

the processor determining an orientation of the boundary,

in response to detecting a change of the state of the display from the unfolded state to the folded state and determining that the boundary is in vertical orientation while the display is in the first display state, the processor switching from the first display state to the second display state while maintaining an orientation of the first page image, and

in response to detecting the change of the state of the display from the unfolded state to the folded state and determining that the boundary is in horizontal orientation while the display is in the first display state, the processor switching from the first display state to the second display state with rotating one of the first page image and the second page image through 180 degrees in respective one of the first display area and the second display area, and displaying the one of the first page image and the second page image at a position at which the one of the first page image and the second page image coincides with the other one of the first page image and the second page image.

2. The display apparatus according to claim 1 , wherein

in displaying the first page image, the second page image, or both on the display in the unfolded state,

in a first case in which images to be displayed are in portrait orientation and the display is in horizontal orientation, the processor displays the first page image and the second page image on the display so that the first page image and the second page image are arranged horizontally,

in a second case in which an image to be displayed is in portrait orientation and the display is in vertical orientation, the processor displays the first page image or the second page image on the display so that the first page image or the second page image has a larger size than in the first case,

in a third case in which images to be displayed are in landscape orientation and the display is in vertical orientation, the processor displays the first page image and the second page image on the display so that the first page image and the second page image are arranged vertically, and

in a fourth case in which an image to be displayed is in landscape orientation and the display is in horizontal orientation, the processor displays the first page image or the second page image on the display so that the first page image or the second page image has a larger size than in the third case.

3. The display apparatus according to claim 2 , wherein

the processor does not display the second page image when the display is in the first display state.

4. The display apparatus according to claim 2 , wherein

when the display is rotated clockwise through 360 degrees in a same plane in a state in which the first page image and the second page image are displayed on the display in the first case or the third case, the processor displays, on the display, a third page image and a fourth page image that represent a combination of a third page and a fourth page, the combination of the third page and the fourth page being contiguous to a combination of the first page and the second page.

5. The display apparatus according to claim 1 , wherein

when the display is rotated counterclockwise through 360 degrees in the same plane in the state in which the first page image and the second page image are displayed on the display in the first case or the third case, the processor displays, on the display, a fifth page image and a sixth page image that represent a combination of a fifth page and a sixth page, the combination of the fifth page and the sixth page being contiguous to the combination of the first page and the second page and being different from the combination of the third page and the fourth page.

6. The display apparatus according to claim 2 , wherein

when the first page image is oriented in a longitudinal direction that is different from that of the second page image, the processor decides which of the first to the fourth cases holds depending on whether the first page image is in portrait orientation or in landscape orientation and whether the display is in horizontal orientation or in vertical orientation.

7. A non-transitory computer-readable storage medium storing a display control program that controls displaying of a page image on a display changeable to a plurality of states including a folded state in which the display is folded along a boundary between a first display area and a second display area and the first display area and the second display area face in opposite directions and an unfolded state in which the first display area and the second display area face in a same direction without the display being folded along the boundary, wherein the display control program

determines an orientation and a state of the display,

controls the displaying of the page image on the display according to the orientation and the state of the display,

in a state of displaying an image file including a first page image representing a first page and a second page image representing a second page that is a next page of the first page, switches between a first display state in which the first page image is displayed across the first display area and the second display area while the display being in the unfolded state and a second display state in which the first page image is displayed on the first display area and the second page image is displayed on the second display area while the display being in the folded state in response to a user changing the state of the display between the folded state and the unfolded state,

selectively executes, according to whether the first page image is in portrait orientation or in landscape orientation, one of a first mode in which the first display state and the second display state are switched in response to the user changing the state of the display between the folded state and the unfolded state and a second mode in which the second display state and a third display state in which the first page image and the second page image are displayed on the first display area and the second display area while the display being in the unfolded state are switched in response to the user changing the state of the display between the folded state and the unfolded state,

displays the first page image on the display in the first display state so that the first page image has a larger size than in the third display state,

determines an orientation of the boundary,

in response to detecting a change of the state of the display from the unfolded state to the folded state and determining that the boundary is in vertical orientation while the display is in the first display state, switches from the first display state to the second display state while maintaining an orientation of the first page image, and

in response to detecting the change of the state of the display from the unfolded state to the folded state and determining that the boundary is in horizontal orientation while the display is in the first display state, switches from the first display state to the second display state with rotating one of the first page image and the second page image through 180 degrees in respective one of the first display area and the second display area, and displays the one of the first page image and the second page image at a position at which the one of the first page image and the second page image coincides with the other one of the first page image and the second page image.

8. A non-transitory computer-readable storage medium storing a display control program that controls displaying of a page image on a display, wherein the display control program

determines orientation of the display,

displays a first page image representing a first page and a second page image representing a second page,

determines whether the page image is in portrait orientation or in landscape orientation, and

wherein in response to determining that the first page image is orientated in a longitudinal direction that is different from that of the second page image based on a determination result about whether the page image is in portrait orientation or in landscape orientation, the display control program automatically changes a display mode on the display depending on both whether the first page image is in portrait orientation or in landscape orientation and whether the display is in horizontal orientation or in vertical orientation.

9. A display apparatus, comprising:

a display on which an image is displayed; and

a processor that determines orientation of the display and controls displaying of a page image on the display,

the processor determining whether the page image is in portrait orientation or in landscape orientation,

the processor selecting a display mode of the page image on the display according to both a determination result about whether the page image is in portrait orientation or in landscape orientation and a determination result about the orientation of the display such that the page image is displayed on the display in a different manner according to both the determination result about whether the page image is in portrait orientation or in landscape orientation and the determination result about the orientation of the display,

in displaying a first page image representing a first page, a second page image representing a second page, or both on the display,

in a first case in which images to be displayed are in portrait orientation and the display is in horizontal orientation, the processor displaying the first page image and the second page image on the display so that the first page image and the second page image are arranged horizontally,

in a second case in which an image to be displayed is in portrait orientation and the display is in vertical orientation, the processor displaying the first page image or the second page image on the display so that the first page image or the second page image has a larger size than in the first case,

in a third case in which images to be displayed are in landscape orientation and the display is in vertical orientation, the processor displaying the first page image and the second page image on the display so that the first page image and the second page image are arranged vertically, and

in a fourth case in which an image to be displayed is in landscape orientation and the display is in horizontal orientation, the processor displaying the first page image or the second page image on the display so that the first page image or the second page image has a larger size than in the third case, and

when the display is rotated clockwise through 360 degrees in a same plane in a state in which the first page image and the second page image are displayed on the display in the first case or the third case, the processor displaying, on the display, a third page image and a fourth page image that represent a combination of a third page and a fourth page, the combination of the third page and the fourth page being contiguous to a combination of the first page and the second page.

10. The display apparatus according to claim 9 , wherein

when the display is rotated counterclockwise through 360 degrees in the same plane in the state in which the first page image and the second page image are displayed on the display in the first case or the third case, the processor displays, on the display, a fifth page image and a sixth page image that represent a combination of a fifth page and a sixth page, the combination of the fifth page and the sixth page being contiguous to the combination of the first page and the second page and being different from the combination of the third page and the fourth page.

11. A display apparatus, comprising:

a display; and

a processor that

determines orientation of the display,

displays a page image including a first page image representing a first page and a second page image representing a second page, and

determines whether the page image is in portrait orientation or in landscape orientation,

in response to determining that the first page image is oriented in a longitudinal direction that is different from that of the second page image based on a determination result about whether the page image is in portrait orientation or in landscape orientation, the processor automatically changing a display mode on the display depending on both whether the first page image is in portrait orientation or in landscape orientation and whether the display is in horizontal orientation or in vertical orientation.

12. A non-transitory computer-readable storage medium storing a display control program that controls displaying of a page image on a display, wherein the display control program

determines orientation of the display,

determines whether the page image is in portrait orientation or in landscape orientation, and

selects a display mode of the page image on the display according to both a determination result about whether the page image is in portrait orientation or in landscape orientation and a determination result about the orientation of the display such that the page image is displayed on the display in a different manner according to both the determination result about whether the page image is in portrait orientation or in landscape orientation and the determination result about the orientation of the display,

wherein in displaying a first page image representing a first page, a second page image representing a second page, or both on the display,

in a first case in which images to be displayed are in portrait orientation and the display is in horizontal orientation, the display control program displays the first page image and the second page image on the display so that the first page image and the second page image are arranged horizontally,

in a second case in which an image to be displayed is in portrait orientation and the display is in vertical orientation, the display control program displays the first page image or the second page image on the display so that the first page image or the second page image has a larger size than in the first case,

in a third case in which images to be displayed are in landscape orientation and the display is in vertical orientation, the display control program displays the first page image and the second page image on the display so that the first page image and the second page image are arranged vertically, and

in a fourth case in which an image to be displayed is in landscape orientation and the display is in horizontal orientation, the display control program displays the first page image or the second page image on the display so that the first page image or the second page image has a larger size than in the third case, and

wherein when the display is rotated clockwise through 360 degrees in a same plane in a state in which the first page image and the second page image are displayed on the display in the first case or the third case, the display control program displays, on the display, a third page image and a fourth page image that represent a combination of a third page and a fourth page, the combination of the third page and the fourth page being contiguous to a combination of the first page and the second page.