Text wrapping

2 files changed, 51 insertions, 1 deletions

diff --git a/src/ui_elements/UI.c b/src/ui_elements/UI.c
index fb469e3..7e00aa3 100644
--- a/src/ui_elements/UI.c
+++ b/src/ui_elements/UI.c
@@ -1,7 +1,56 @@
 #include "UI.h"
 #include <raylib.h>
 
+const int MAX_LINES = 256;
+const int SPACING_H = 1;
+
 void DrawRecBordered(Rectangle rec, Color bg, Color border_color, int border_width) {
     DrawRectangleRounded(rec, 0.015f, 8, bg); 
     DrawRectangleRoundedLinesEx(rec, 0.015f, 8, border_width, border_color);
 }
+
+float MeasureChar(Font *font, int height, char symbol) {
+    char buf[2] = { symbol, 0 };
+    return MeasureTextEx(*font, buf, height, SPACING_H).x;
+}
+
+int CalculateSpans(Rectangle rec, char *text, Font *font, int height, int *spans) {
+    spans[0] = 0;
+    int ptr = 0, span_ptr = 1, last_space_ptr;
+    float acc = 0;
+    while (text[ptr] != 0x0) {
+        float char_width = MeasureChar(font, height, text[ptr]);
+        acc += char_width + SPACING_H;
+        if (text[ptr] == ' ') last_space_ptr = ptr;
+        if (acc > rec.width) {
+            spans[span_ptr] = last_space_ptr + 1;
+            ptr = last_space_ptr;
+            span_ptr++;
+            acc = 0;
+        }
+        ptr++;
+    }
+    return span_ptr + 1;
+}
+
+void DrawTextInRec(Rectangle rec, char *text, Font *font, int height, Color color) {
+    int spans[MAX_LINES];
+    int lines = CalculateSpans(rec, text, font, height, spans);
+
+    if (lines == 2) {
+        Vector2 pos = {.x = rec.x, .y = rec.y};
+        DrawTextEx(*font, text, pos, height, SPACING_H, color);
+        return;
+    }
+
+    int vertical_acc = rec.y;
+    for (int i = 1; i < lines; i++) {
+        Vector2 pos = { .x = rec.x, .y = vertical_acc };
+        char *line_start = text + spans[i-1];
+        int line_length = spans[i] - spans[i-1];
+        DrawTextEx(*font, 
+                TextFormat("%.*s", line_length, line_start), 
+                pos, height, SPACING_H, color);
+        vertical_acc += height;
+    }
+}
diff --git a/src/ui_elements/UI.h b/src/ui_elements/UI.h
index 4e70482..b98ece0 100644
--- a/src/ui_elements/UI.h
+++ b/src/ui_elements/UI.h
@@ -3,6 +3,7 @@
 #ifndef UI_ELEMENTS_H
 #define UI_ELEMENTS_H
 
-void DrawRecBordered(Rectangle rec, Color bg, Color border, int border_width);
+void DrawRecBordered(Rectangle rec, Color bg, Color border_color, int border_width);
+void DrawTextInRec(Rectangle rec, char *text, Font *font, int height, Color color);
 
 #endif // UI_ELEMENTS_H