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Improved Vertical Scrolling

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This commit is contained in:
techdragon.nguyen@gmail.com
2010-11-28 23:54:36 +00:00
parent 3205ebdc8b
commit 8fd35ac513
7 changed files with 70 additions and 47 deletions
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74
projects/mtg/src/TextScroller.cpp
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@@ -31,7 +31,8 @@ void TextScroller::setRandom(int mode)
void TextScroller::Add(string text)
{
if (!strings.size()) mText = text;
if (!strings.size())
mText = text;
strings.push_back(text);
}
@@ -85,50 +86,61 @@ ostream& TextScroller::toString(ostream& out) const
VerticalTextScroller::VerticalTextScroller(int fontId, float x, float y, float width, float height, float scrollSpeed, size_t numItemsShown) :
TextScroller( fontId, x, y, width, scrollSpeed)
{
mHeight = height;
mNbItemsShown = numItemsShown;
mVerticalScrollSpeed = 10.0f;
mMarginX = 0;
mMarginY = 215;
mScrollerInitialized = false;
timer=0;
WFont *mFont = resources.GetWFont(fontId);
mOriginalY = mY;
mMarginY = mY - mFont->GetHeight();
Add("\n"); // initialize the scroller with a blank line
}
void VerticalTextScroller::Add( string text )
{
strings.push_back( text );
string wrappedText = wordWrap(text, mWidth);
mText.append(wrappedText);
}
/*
Updates happen everytime the top line disappears from view.
The top line is then moved to the end of the file and the scrolling resumes where it left off
*/
void VerticalTextScroller::Update(float dt)
{
if (!strings.size()) return;
WFont * mFont = resources.GetWFont(fontId);
ostringstream scrollerText;
// update the veritcal scrolling
if ( mScrollerInitialized )
{
mY -= mVerticalScrollSpeed * dt;
if ( mY < mMarginY )
mY = mMarginY + 20;
float currentYOffset = mScrollSpeed * dt;
if ( mY <= mMarginY ) // top line has disappeared
{
timer = 0;
// now readjust mText
size_t nbLines = 1;
vector<string> displayText = split( mText, '\n');
vector<string> newDisplayText;
for ( size_t i = nbLines; i < displayText.size(); ++i )
newDisplayText.push_back( displayText[i] );
for ( size_t i = 0; i < nbLines; ++i )
newDisplayText.push_back( displayText[i] );
mText = join( newDisplayText, "\n" );
mY = mOriginalY;
}
// update the text
if (timer == 0)
{
mScrollerInitialized = false;
size_t nbItemsToDisplay = (mNbItemsShown < strings.size() ? mNbItemsShown : strings.size());
for (size_t idx = 0; idx < nbItemsToDisplay; ++idx)
{
size_t index = (currentId + idx) % strings.size();
scrollerText << strings[index];
}
currentId++;
if (currentId >= strings.size())
currentId = 0;
mText = wordWrap(scrollerText.str(), mWidth);
mY = mMarginY + 20;
}
timer = ++timer % ((int) mScrollSpeed);
++timer;
mY -= currentYOffset;
}
void VerticalTextScroller::Render()
@@ -172,6 +184,6 @@ std::string VerticalTextScroller::wordWrap(std::string sentence, float width)
}
if ( numLines * mFont->GetHeight() > mHeight )
mScrollerInitialized = true;
return retVal;
}