add draw_multiline_text and draw_multiline_text_ex (#751)

text: add `draw_multiline_text` and `draw_multiline_text_ex`

src/text.rs

@@ -359,13 +359,65 @@ pub fn draw_text_ex(text: &str, x: f32, y: f32, params: TextParams) {
                 dest_size: Some(vec2(dest.w, dest.h)),
                 source: Some(source),
                 rotation: angle_rad,
-                pivot: Option::Some(vec2(dest.x, dest.y)),
+                pivot: Some(vec2(dest.x, dest.y)),
                 ..Default::default()
             },
         );
     }
 }
 
+/// Draw multiline text with the given font_size, line_distance_factor and color.
+/// If no line distance but a custom font is given, the fonts line gap will be used as line distance factor if it exists.
+pub fn draw_multiline_text(
+    text: &str,
+    x: f32,
+    y: f32,
+    font_size: f32,
+    line_distance_factor: Option<f32>,
+    color: Color,
+) {
+    draw_multiline_text_ex(
+        text,
+        x,
+        y,
+        line_distance_factor,
+        TextParams {
+            font_size: font_size as u16,
+            font_scale: 1.0,
+            color,
+            ..Default::default()
+        },
+    )
+}
+
+/// Draw multiline text with the given line distance and custom params such as font, font size and font scale.
+/// If no line distance but a custom font is given, the fonts newline size will be used as line distance factor if it exists.
+pub fn draw_multiline_text_ex(
+    text: &str,
+    x: f32,
+    mut y: f32,
+    line_distance_factor: Option<f32>,
+    params: TextParams,
+) {
+    let line_distance = match line_distance_factor {
+        Some(distance) => distance,
+        None => {
+            let mut font_line_distance = 0.0;
+            if let Some(font) = params.font {
+                if let Some(metrics) = font.font.horizontal_line_metrics(1.0) {
+                    font_line_distance = metrics.new_line_size;
+                }
+            }
+            font_line_distance
+        }
+    };
+
+    for line in text.lines() {
+        draw_text_ex(line, x, y, params.clone());
+        y += line_distance * params.font_size as f32 * params.font_scale;
+    }
+}
+
 /// Get the text center.
 pub fn get_text_center(
     text: &str,