text align rendering

src/framework/engine.cpp

@@ -75,7 +75,7 @@ void Engine::run()
         // fire platform events
         Platform::poll();
 
-        //poll network events
+        // poll network events
         g_connections.poll();
 
         // update before redering
@@ -102,12 +102,11 @@ void Engine::run()
 
             // render fps
             if(m_calculateFps) {
-                g_defaultFont->renderText(fpsPos, format("FPS: %d", fps));
+                g_defaultFont->renderText(format("FPS: %d", fps), fpsPos);
             }
 
             // swap buffers
             Platform::swapBuffers();
-        //}
         }
     }
 

src/framework/font.cpp

@@ -101,15 +101,24 @@ bool Font::load(const std::string& file)
     return true;
 }
 
-void Font::renderText(const Point& pos, const std::string& text)
+void Font::renderText(const std::string& text,
+                      const Point& startPos)
 {
-    Size boxSize = g_graphics.getScreenSize() - pos.toSize();
+    Size boxSize = g_graphics.getScreenSize() - startPos.toSize();
-    Rect screenCoords(pos, boxSize);
+    Rect screenCoords(startPos, boxSize);
-    Font::renderText(screenCoords, text);
+    Font::renderText(text, screenCoords);
 }
 
-void Font::renderText(const Rect& screenCoords, const std::string& text, const Point& startRenderPosition, bool debug)
+void Font::renderText(const std::string& text,
+                    const Rect& screenCoords,
+                    int align,
+                    const Point& startInternalPos,
+                    bool debug)
 {
+    // prevent glitches from invalid rects
+    if(!screenCoords.isValid())
+        return;
+
     // begin texture rendering
     g_graphics.setColor(m_color);
     g_graphics._beginTextureRender(m_texture.get());
@@ -118,7 +127,8 @@ void Font::renderText(const Rect& screenCoords, const std::string& text, const P
     int textLenght = text.length();
 
     // map glyphs positions
-    Point *glyphsPositions = mapGlyphsPositions(text);
+    Size textBoxSize;
+    Point *glyphsPositions = calculateGlyphsPositions(text, align, &textBoxSize);
 
     for(int i = 0; i < textLenght; ++i) {
         int glyph = (int)text[i];
@@ -127,26 +137,45 @@ void Font::renderText(const Rect& screenCoords, const std::string& text, const P
         if(glyph < 32)
             continue;
 
-        // calculate virtual glyph rect
+        // calculate initial glyph rect and texture coords
         Rect glyphScreenCoords(glyphsPositions[i], m_glyphsSize[glyph]);
         Rect glyphTextureCoords = m_glyphsTextureCoords[glyph];
 
-        // only render glyphs that is visible after startRenderPosition
+        // first translate to align position
-        if(glyphScreenCoords.bottom() < startRenderPosition.y || glyphScreenCoords.right() < startRenderPosition.x)
+        if(align & ALIGN_BOTTOM) {
+            glyphScreenCoords.translate(0, screenCoords.height() - textBoxSize.height());
+        } else if(align & ALIGN_VERTICAL_CENTER) {
+            glyphScreenCoords.translate(0, (screenCoords.height() - textBoxSize.height()) / 2);
+        } else { // ALIGN_TOP
+            // nothing to do
+        }
+
+        if(align & ALIGN_RIGHT) {
+            glyphScreenCoords.translate(screenCoords.width() - textBoxSize.width(), 0);
+        } else if(align & ALIGN_HORIZONTAL_CENTER) {
+            glyphScreenCoords.translate((screenCoords.width() - textBoxSize.width()) / 2, 0);
+        } else { // ALIGN_TOP
+            // nothing to do
+        }
+
+        // only render glyphs that are after startRenderPosition
+        if(glyphScreenCoords.bottom() < startInternalPos.y || glyphScreenCoords.right() < startInternalPos.x)
             continue;
 
         // bound glyph topLeft to startRenderPosition
-        if(glyphScreenCoords.top() < startRenderPosition.y) {
+        if(glyphScreenCoords.top() < startInternalPos.y) {
-            glyphTextureCoords.setTop(glyphTextureCoords.top() + (startRenderPosition.y - glyphScreenCoords.top()));
+            glyphTextureCoords.setTop(glyphTextureCoords.top() + (startInternalPos.y - glyphScreenCoords.top()));
-            glyphScreenCoords.setTop(startRenderPosition.y);
+            glyphScreenCoords.setTop(startInternalPos.y);
         }
-        if(glyphScreenCoords.left() < startRenderPosition.x) {
+        if(glyphScreenCoords.left() < startInternalPos.x) {
-            glyphTextureCoords.setLeft(glyphTextureCoords.left() + (startRenderPosition.x - glyphScreenCoords.left()));
+            glyphTextureCoords.setLeft(glyphTextureCoords.left() + (startInternalPos.x - glyphScreenCoords.left()));
-            glyphScreenCoords.setLeft(startRenderPosition.x);
+            glyphScreenCoords.setLeft(startInternalPos.x);
         }
 
-        // translate glyph
+        // subtract startInternalPos
-        glyphScreenCoords.translate(-startRenderPosition);
+        glyphScreenCoords.translate(-startInternalPos);
+
+        // translate rect to screen coords
         glyphScreenCoords.translate(screenCoords.topLeft());
 
         // only render if glyph rect is visible on screenCoords
@@ -175,46 +204,78 @@ void Font::renderText(const Rect& screenCoords, const std::string& text, const P
         g_graphics.drawBoundingRect(screenCoords.expanded(1), Color(0xFF00FF00), 1);
 }
 
-Size Font::calculateTextSize(const std::string& text, Point *glyphsPositions)
+Point* Font::calculateGlyphsPositions(const std::string& text, int align, Size *textBoxSize)
-{
-    if(!glyphsPositions) {
-        glyphsPositions = mapGlyphsPositions(text);
-    }
-
-    Size size;
-    int numGlyphs = text.length();
-    for(int i = 0; i < numGlyphs; ++i) {
-        Point bottomLeft = glyphsPositions[i] + m_glyphsSize[(int)text[i]].toPoint();
-        size = size.expandedTo(bottomLeft.toSize());
-    }
-    return size;
-}
-
-Point* Font::mapGlyphsPositions(const std::string& text)
 {
     static Point glyphsPositions[8192];
-    int numGlyphs = text.length();
+    static int lineWidths[512];
-    Point virtualPos;
+    int maxLineWidth = 0;
+    int lines = 0;
+    int glyph;
+    int i;
 
+    // protect buffer overflow on glyphsPostions
+    int numGlyphs = text.length();
     if(numGlyphs > 8192)
         logFatal("A text was too long to render!");
 
-    for(int i = 0; i < numGlyphs; ++i) {
+    // calculate lines width
-        int glyph = (int)text[i];
+    if((align & ALIGN_RIGHT || align & ALIGN_HORIZONTAL_CENTER) || textBoxSize) {
+        lineWidths[0] = 0;
+        for(i = 0; i< numGlyphs; ++i) {
+            glyph = (int)text[i];
+
+            if(glyph == (uchar)'\n') {
+                lineWidths[++lines] = 0;
+            } else if(glyph >= 32) {
+                lineWidths[lines] += m_glyphsSize[glyph].width();
+                maxLineWidth = std::max(maxLineWidth, lineWidths[lines]);
+            }
+        }
+    }
+
+    Point virtualPos;
+    lines = 0;
+    for(i = 0; i < numGlyphs; ++i) {
+        glyph = (int)text[i];
 
         // store current glyph topLeft
         glyphsPositions[i] = virtualPos;
 
-        // new line
+        // new line or first glyph
+        if(glyph == (uchar)'\n' || i == 0) {
             if(glyph == (uchar)'\n') {
                 virtualPos.y += m_lineHeight;
+                lines++;
+            }
+
+            // calculate start x pos
+            if(align & ALIGN_RIGHT) {
+                virtualPos.x = (maxLineWidth - lineWidths[lines]);
+            } else if(align & ALIGN_HORIZONTAL_CENTER) {
+                virtualPos.x = (maxLineWidth - lineWidths[lines]) / 2;
+            } else { // ALIGN_LEFT
                 virtualPos.x = 0;
             }
+        }
+
         // render only if the glyph is valid
-        else if(glyph >= 32) {
+        if(glyph >= 32 && glyph != (uchar)'\n') {
             virtualPos.x += m_glyphsSize[glyph].width();
         }
     }
 
+    if(textBoxSize) {
+        textBoxSize->setWidth(maxLineWidth);
+        textBoxSize->setHeight(virtualPos.y + m_lineHeight);
+    }
+
     return (Point *)glyphsPositions;
 }
+
+
+Size Font::calculateTextBoxSize(const std::string& text)
+{
+    Size size;
+    calculateGlyphsPositions(text, ALIGN_TOP_LEFT, &size);
+    return size;
+}

src/framework/font.h

@@ -30,30 +30,7 @@
 #include "texture.h"
 #include "rect.h"
 
-class Font
+enum EAlign {
-{
-public:
-    Font();
-    virtual ~Font() { }
-
-    /// Load font from file
-    bool load(const std::string &file);
-
-    /// Simple text render starting at pos
-    void renderText(const Point& pos, const std::string& text);
-
-    /** Advanced text render
-     * screenCoords is the rect that will be filled on the screen
-     * startRenderPosition is the postion to start rendering relative to the text rect
-     */
-    void renderText(const Rect& screenCoords, const std::string& text, const Point& startRenderPosition = Point(), bool debug = false);
-
-    /// Simulate render and calculate text size
-    Size calculateTextSize(const std::string& text, Point *glyphsPositions = NULL);
-
-    Point *mapGlyphsPositions(const std::string& text);
-    /*
-    enum EAlign {
     ALIGN_TOP = 1 << 0,
     ALIGN_BOTTOM = 1 << 1,
     ALIGN_LEFT = 1 << 2,
@@ -65,7 +42,38 @@ public:
     ALIGN_TOP_LEFT = ALIGN_TOP | ALIGN_LEFT,
     ALIGN_BOTTOM_RIGHT = ALIGN_BOTTOM | ALIGN_RIGHT,
     ALIGN_BOTTOM_LEFT = ALIGN_BOTTOM | ALIGN_LEFT
-    };
+};
+    
+class Font
+{
+public:
+    Font();
+    virtual ~Font() { }
+
+    /// Load font from file
+    bool load(const std::string &file);
+
+    /// Simple text render starting at pos
+    void renderText(const std::string& text,
+                    const Point& startPos);
+
+    /** Advanced text render
+     * screenCoords is the rect that will be filled on the screen
+     * startRenderPosition is the postion to start rendering relative to the text rect
+     */
+    void renderText(const std::string& text,
+                    const Rect& screenCoords,
+                    int align = ALIGN_TOP_LEFT,
+                    const Point& startInternalPos = Point(),
+                    bool debug = false);
+
+    /// Calculate glyphs positions to use on render, also calculates textBoxSize if wanted
+    Point *calculateGlyphsPositions(const std::string& text, int align = ALIGN_TOP_LEFT, Size *textBoxSize = NULL);
+
+    /// Simulate render and calculate text size
+    Size calculateTextBoxSize(const std::string& text);
+
+    /*
     /// Render a text inside a rect
     void renderText(const Rect& screenCoords, EAlign align, const std::string& text);
     */

src/main.cpp

@@ -101,7 +101,7 @@ int main(int argc, const char *argv[])
                            640, 480,
                            g_configs.getBoolean("window maximized"));
     Platform::setWindowTitle("OTClient");
-    Platform::setVsync();
+    //Platform::setVsync();
 
     // init engine
     g_engine.init();

src/menustate.cpp

@@ -94,9 +94,9 @@ void MenuState::render()
                               "Praesent at enim sapien, at vestibulum ligula.\n"
                               "Aliquam eleifend ante eu sapien vehicula consectetur.\n"
                               "Nunc id ligula ligula, eget vestibulum magna.\n"
-                              "In mattis nisi non nisl semper ultricies.\n";
+                              "In mattis nisi non nisl semper ultricies.";
-    Size textSize = g_defaultFont->calculateTextSize(text);
+    Size textSize = g_defaultFont->calculateTextBoxSize(text);
-    g_defaultFont->renderText(Rect(100, 100, textSize.width() - 120, textSize.height() - 15), text, Point(x,y), true);
+    g_defaultFont->renderText(text, Rect(100, 100, textSize.width()-30, textSize.height()-30), ALIGN_CENTER, Point(x,y), true);
 }
 
 void MenuState::update(int ticks, int elapsedTicks)