/**
* Creates a new selector.
*
* @param screenDefinition Current screen definition
*/
public Selector(final ScreenDefinition screenDefinition) {
this.screenDefinition = screenDefinition;
offsetX = 0;
offsetY = 0;
selectorPosX = screenDefinition.getWidthGameFrame() / 2;
selectorPosY = screenDefinition.getHeight() / 2;
}
/**
* Centers the screen at the given position.
*
* @param pos position to center.
*/
public void center(final Pos pos) {
int newOffsetX = pos.getX() - screenDefinition.getWidthGameFrame() / 2;
int newOffsetY = pos.getY() - screenDefinition.getHeight() / 2;
setOffset(newOffsetX - offsetX, newOffsetY - offsetY);
Pos selectedPos = getSelectedPosition();
int newSelector1PosX = pos.getX() - selectedPos.getX();
int newSelector1PosY = pos.getY() - selectedPos.getY();
setSelectedPos(newSelector1PosX, newSelector1PosY);
}
/**
* Updates the x and the y offset. This changes the displayed fields.
*
* <p>The implementation ensured that the displayed fields are always between 0 and
* screenDefinition.getWidthGameFrame() for x values and between 0 and
* screenDefinition.getHeight() for y values.
*
* @param offX amount of change the x offset
* @param offY amount of change the y offset
*/
public void setOffset(final int offX, final int offY) {
offsetX = offsetX + offX;
if (offsetX + screenDefinition.getWidthGameFrame() > WorldMap.getInstance().getSizeX() - 1) {
offsetX = WorldMap.getInstance().getSizeX() - screenDefinition.getWidthGameFrame() - 1;
}
if (offsetX < 0) {
offsetX = 0;
}
offsetY = offsetY + offY;
if (offsetY + screenDefinition.getHeight() > WorldMap.getInstance().getSizeY() - 1) {
offsetY = WorldMap.getInstance().getSizeY() - screenDefinition.getHeight() - 1;
}
if (offsetY < 0) {
offsetY = 0;
}
}
/**
* Updates the x and the y position of the cursor.
*
* <p>The implementation ensured that the displayed fields are always between 0 and
* screenDefinition.getWidthGameFrame() for x values and between 0 and
* screenDefinition.getHeight() for y values.
*
* @param offsetX amount of change the x value
* @param offsetY amount of change the y value
*/
protected void setSelectedPos(final int offsetX, final int offsetY) {
selectorPosX = selectorPosX + offsetX;
if (selectorPosX > screenDefinition.getWidthGameFrame()) {
selectorPosX = screenDefinition.getWidthGameFrame();
}
if (selectorPosX < 0) {
selectorPosX = 0;
}
selectorPosY = selectorPosY + offsetY;
if (selectorPosY > screenDefinition.getHeight()) {
selectorPosY = screenDefinition.getHeight();
}
if (selectorPosY < 0) {
selectorPosY = 0;
}
}
/**
* Move the cursor one step east. The distance is depending on the current selection mode. If the
* selection mode is off, the cursor moves 10 fields, otherwise one field.
*
* <p>The implementation ensured that the displayed fields are always between 0 and
* screenDefinition.getWidthGameFrame().
*
* @param isSelectionMode Flag, if a selection mode is on
*/
public void right(final boolean isSelectionMode) {
if (isSelectionMode) {
setSelectedPos(1, 0);
if (selectorPosX == screenDefinition.getWidthGameFrame() - 4) {
int offset = offsetX;
setOffset(10, 0);
setSelectedPos(offset - offsetX, 0);
}
} else {
setOffset(10, 0);
}
}
/**
* Move the cursor one step south. The distance is depending on the current selection mode. If the
* selection mode is off, the cursor moves 10 fields, otherwise one field.
*
* <p>The implementation ensured that the displayed fields are always between 0 and
* screenDefinition.getHeight().
*
* @param isSelectionMode Flag, if a selection mode is on
*/
public void down(final boolean isSelectionMode) {
if (isSelectionMode) {
setSelectedPos(0, 1);
if (selectorPosY == screenDefinition.getHeight() - 4) {
int offset = offsetY;
setOffset(0, 10);
setSelectedPos(0, offset - getOffsetY());
}
} else {
setOffset(0, 10);
}
}