Display control device, display control method, and program
An apparatus includes a display control unit, including a processor, configured to control a display to display an image on a screen and to scroll the image toward a target position. The display control unit is configured to scroll the image with a scroll speed based on a difference between a current position and the target position.
1. An apparatus comprising:
a display control unit, including a processor, configured to control a display to display an image on a screen and to scroll the image toward a target position, the display control unit configured to scroll the image with a scroll speed equal to a proportionality constant α times a difference between a current position and the target position,
wherein the proportionality constant α varies based on the difference between the current position and the target position.
2. The apparatus according to claim 1 , wherein the proportionality constant α is equal to a first constant in an event the difference between the current position and the target position is below a first value, is equal to a varying value in an event the difference between the current position and the target position is between the first value and a second value, and is equal to a second constant in an event the difference between the current position and the target position is above the second value.
3. The apparatus according to claim 1 , wherein the scroll speed is dependent on a previous speed in an event the difference between the current position and the target position is less than a first value, wherein the previous speed is a speed determined at a predetermined time prior to a current time corresponding to a current scroll location, and wherein the scroll speed is equal to an increasing value in an event the difference between the current position and the target position is greater than the first value.
4. The apparatus according to claim 1 , wherein the scroll speed v c (t) is equal to:
v
c
(
t
)
=
α
y
s
(
t
)
-
y
c
(
t
)
dt
+
χ
v
c
(
t
-
dt
)
χ
+
1
Formula
5
in an event the difference between the current position and the target position is less than a first value, where v c (t-dt) is a previous speed, y s is the target position, y c is the current position, and
α and χ are proportionality constants, and the scroll speed is equal to an increasing value in an event the difference between the current position and the target position is greater than the first value,
wherein the previous speed is a speed determined at a predetermined time prior to a current time corresponding to a current scroll location.
5. The apparatus according to claim 1 , wherein the display control unit is configured to control the display to display a scroll knob within a scroll bar which is located along one edge of the display.
6. The apparatus according to claim 5 , wherein the display control unit is configured to control the display to display a rectangular scroll knob located within the scroll bar proportional to a scroll location.
7. The apparatus according to claim 5 , wherein the display control unit is configured to control the display to scroll the image based on movement of the scroll knob by a user.
8. The apparatus according to claim 1 , wherein the scroll speed is dependent on a previous speed, wherein the previous speed is a speed determined at a predetermined time prior to a current time corresponding to a current scroll location.
9. A method comprising:
controlling, using a processor, a display to display an image on a screen and to scroll the image toward a target position, the controlling including scrolling the image with a scroll speed based on a difference between a current position and the target position, wherein the scroll speed is equal to a proportionality constant α times a difference between the current position and the target position,
wherein the proportionality constant α varies based on the difference between the current position and the target position.
10. A non-transitory computer readable medium encoded with a set of instructions that, when loaded on a processor, causes the processor to perform a method comprising:
controlling, using a processor, a display to display an image on a screen and to scroll the image toward a target position, the controlling including scrolling the image with a scroll speed based on a difference between a current position and the target position, wherein the scroll speed is equal to a proportionality constant α times a difference between the current position and the target position,
wherein the proportionality constant α varies based on the difference between the current position and the target position.