* text anchor

1 files changed, 61 insertions, 6 deletions

diff --git a/Runtime/GUI/UITextMesh.cpp b/Runtime/GUI/UITextMesh.cpp
index abb5231..94e61c4 100644
--- a/Runtime/GUI/UITextMesh.cpp
+++ b/Runtime/GUI/UITextMesh.cpp
@@ -29,6 +29,7 @@ static unsigned int s_IndicesPerText;
 struct TextInfo {
 	const Character* ch;
 	float offset;
+    int line; // 从0开始
 };
 
 static unordered_map<unsigned int, vector<TextInfo>> s_TextInfos;
@@ -59,27 +60,56 @@ InitializeStaticVariables([]() {
 // * 换行
 // * 颜色
 
-UITextMesh::UITextMesh(const UnicodeString& str, Font* font,int pixelSize, ETextAnchor anchor, ETextAlignment alignment)
+// lineheight 用来处理换行、锚点
+// wordwrap 自动换行
+// preferredSize 自动换行区域大小
+UITextMesh::UITextMesh(const UnicodeString& str, Font* font, int pixelSize, int lineHeight, ETextAnchor anchor, ETextAlignment alignment, bool wordwrap, float preferred)
 {
 	m_Font = font;
 	s_TextInfos.clear();
     const Vector2 atlasSize = font->GetAtlasSize();
 
+    Vector2 textRegion;
     // 按照不同的atlas分类到s_TextInfos
 	float offset = 0;
+    int line = 0;
 	for (int i = 0; i < str.length; ++i)
 	{
 		character::Unicode c = str.str[i];
 		const Character* ch = font->GetCharacter(c, pixelSize);
         if (ch == NULL)
             continue;
+
+        if (wordwrap) // 自动换行
+        {
+            if (offset + ch->bearing.x + ch->position.width > preferred)
+            {
+                ++line;
+                offset = 0;
+            }
+        }
+
 		unsigned int atlasIndex = ch->atlas;
-		
         if (atlasIndex != FONT_NOT_IN_ATLAS_PLACEHOLDER) //非空格
         {
+
+// 换行符Unix'\n', Windows'\r\n', MacOS '\r'
+#define CHECK_BREAKS() \
+            if (c == '\n' || c == '\r')                                                       \
+            {                                                                                 \
+                ++line;                                                                       \
+                offset = 0;                                                                   \
+                if (c == '\r' && ((i + 1) < str.length && str.str[i + 1] == '\n')) /*skip\n*/ \
+                    ++i;                                                                      \
+                continue;                                                                     \
+            }
+
+            CHECK_BREAKS();
+
             TextInfo info;
             info.ch = ch;
             info.offset = offset;
+            info.line = line;
 
             auto list = s_TextInfos.find(atlasIndex);
             if (list == s_TextInfos.end())
@@ -88,13 +118,37 @@ UITextMesh::UITextMesh(const UnicodeString& str, Font* font,int pixelSize, EText
             vector<TextInfo>& v = s_TextInfos[atlasIndex];
             v.push_back(info);
         }
+        else
+        {
+            // 有些字体换行没有字形，所以也需要在这里处理
+            CHECK_BREAKS();
+        }
 
 		offset += ch->advance;
+
+        textRegion.x = max(offset, textRegion.x);
 	}
 
+    textRegion.y = (line + 1) * lineHeight;
+
 	if (s_TextInfos.size() == 0)
 		return;
 
+    Vector2i textOffset;
+    Vector2 halfRegion = Vector2(textRegion.x/ 2.f, textRegion.y / 2.f);
+    switch (anchor)
+    {
+        case TextAnchor_UpperLeft:    textOffset.Set(0,             0);             break;
+        case TextAnchor_UpperCenter:  textOffset.Set(-halfRegion.x, 0);             break;
+        case TextAnchor_UpperRight:   textOffset.Set(-textRegion.x, 0);             break;
+        case TextAnchor_MiddleLeft:   textOffset.Set(0,             -halfRegion.y); break;
+        case TextAnchor_MiddleCenter: textOffset.Set(-halfRegion.x, -halfRegion.y); break;
+        case TextAnchor_MiddleRight:  textOffset.Set(-textRegion.x, -halfRegion.y); break;
+        case TextAnchor_LowerLeft:    textOffset.Set(0,             -textRegion.y); break;
+        case TextAnchor_LowerCenter:  textOffset.Set(-halfRegion.x, -textRegion.y); break;
+        case TextAnchor_LowerRight:   textOffset.Set(-textRegion.x, -textRegion.y); break;
+    }
+
     // 填充VBO和IBO
 	for (auto iter : s_TextInfos) {
 		unsigned int atlasIndex = iter.first; // atlas atlasIndex
@@ -113,12 +167,13 @@ UITextMesh::UITextMesh(const UnicodeString& str, Font* font,int pixelSize, EText
             TextInfo& text = texts[i];
 
             int vOff = i * s_VertexPerText;
+            int lineOff = text.line * lineHeight;
 			// 左上角是原点
             float pos[] = {
-				text.offset + text.ch->bearing.x,                           pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-left
-				text.offset + text.ch->bearing.x + text.ch->position.width, pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-right 
-				text.offset + text.ch->bearing.x + text.ch->position.width, pixelSize - text.ch->bearing.y,                            // top-right 
-				text.offset + text.ch->bearing.x,                           pixelSize - text.ch->bearing.y,                            // top-left 
+				textOffset.x + text.offset + text.ch->bearing.x,                           textOffset.y + lineOff + pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-left
+				textOffset.x + text.offset + text.ch->bearing.x + text.ch->position.width, textOffset.y + lineOff + pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-right 
+				textOffset.x + text.offset + text.ch->bearing.x + text.ch->position.width, textOffset.y + lineOff + pixelSize - text.ch->bearing.y,                            // top-right 
+				textOffset.x + text.offset + text.ch->bearing.x,                           textOffset.y + lineOff + pixelSize - text.ch->bearing.y,                            // top-left 
             };
             Vector4 uvQuad = Vector4(text.ch->position.x / atlasSize.x, text.ch->position.y / atlasSize.y, text.ch->position.width / atlasSize.x, text.ch->position.height / atlasSize.y);
             float uv[] = {