REVIEWED: DrawLineDashed()

Author: raysan5

examples/shapes/shapes_dashed_line.c

@@ -16,8 +16,6 @@
 ********************************************************************************************/
 
 #include "raylib.h"
-#define RAYGUI_IMPLEMENTATION
-#include "raygui.h"                 // Required for GUI controls
 
 //------------------------------------------------------------------------------------
 // Program main entry point
@@ -42,6 +40,7 @@ int main(void)
     int colorIndex = 0;
 
     SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
 
     // Main game loop
     while (!WindowShouldClose())    // Detect window close button or ESC key
@@ -50,8 +49,6 @@ int main(void)
         //----------------------------------------------------------------------------------
         lineEndPosition = GetMousePosition(); // Line endpoint follows the mouse
 
-        // --- Keyboard Controls ---
-
         // Change Dash Length (UP/DOWN arrows)
         if (IsKeyDown(KEY_UP)) dashLength += 1.0f;
         if (IsKeyDown(KEY_DOWN) && dashLength > 1.0f) dashLength -= 1.0f;
@@ -61,11 +58,7 @@ int main(void)
         if (IsKeyDown(KEY_LEFT) && blankLength > 1.0f) blankLength -= 1.0f;
 
         // Cycle through colors ('C' key)
-        if (IsKeyPressed(KEY_C))
-        {
-            colorIndex = (colorIndex + 1) % (sizeof(lineColors)/sizeof(Color));
-        }
-
+        if (IsKeyPressed(KEY_C)) colorIndex = (colorIndex + 1)%(sizeof(lineColors)/sizeof(Color));
         //----------------------------------------------------------------------------------
 
         // Draw

src/raylib.h

@@ -1258,11 +1258,11 @@ RLAPI Rectangle GetShapesTextureRectangle(void);        // Get texture source re
 RLAPI void DrawPixel(int posX, int posY, Color color);                                                   // Draw a pixel using geometry [Can be slow, use with care]
 RLAPI void DrawPixelV(Vector2 position, Color color);                                                    // Draw a pixel using geometry (Vector version) [Can be slow, use with care]
 RLAPI void DrawLine(int startPosX, int startPosY, int endPosX, int endPosY, Color color);                // Draw a line
-RLAPI void DrawLineDashed(Vector2 startPos, Vector2 endPos, int dashSize, int whiteSpaceSize, Color color); // Draw a dashed line
 RLAPI void DrawLineV(Vector2 startPos, Vector2 endPos, Color color);                                     // Draw a line (using gl lines)
 RLAPI void DrawLineEx(Vector2 startPos, Vector2 endPos, float thick, Color color);                       // Draw a line (using triangles/quads)
 RLAPI void DrawLineStrip(const Vector2 *points, int pointCount, Color color);                            // Draw lines sequence (using gl lines)
 RLAPI void DrawLineBezier(Vector2 startPos, Vector2 endPos, float thick, Color color);                   // Draw line segment cubic-bezier in-out interpolation
+RLAPI void DrawLineDashed(Vector2 startPos, Vector2 endPos, int dashSize, int spaceSize, Color color);   // Draw a dashed line
 RLAPI void DrawCircle(int centerX, int centerY, float radius, Color color);                              // Draw a color-filled circle
 RLAPI void DrawCircleSector(Vector2 center, float radius, float startAngle, float endAngle, int segments, Color color);      // Draw a piece of a circle
 RLAPI void DrawCircleSectorLines(Vector2 center, float radius, float startAngle, float endAngle, int segments, Color color); // Draw circle sector outline

src/rshapes.c

@@ -182,53 +182,26 @@ void DrawLine(int startPosX, int startPosY, int endPosX, int endPosY, Color colo
     rlEnd();
 }
 
-void DrawLineDashed(Vector2 startPos, Vector2 endPos, int dashSize, int whiteSpaceSize, Color color)
+// Draw a line defining thickness
+void DrawLineEx(Vector2 startPos, Vector2 endPos, float thick, Color color)
 {
-    // Calculate the vector and length of the line
-    float dx = endPos.x - startPos.x;
-    float dy = endPos.y - startPos.y;
-    float lineLength = sqrtf(dx*dx + dy*dy);
-
-    // If the line is too short for dashing or dash size is invalid, draw a solid thick line
-    if (lineLength < (dashSize + whiteSpaceSize) || dashSize <= 0)
-    {
-        DrawLineV(startPos, endPos, color);
-        return;
-    }
-
-    // Calculate the normalized direction vector of the line
-    float invLineLength = 1 / lineLength;
-    float dirX = dx * invLineLength;
-    float dirY = dy * invLineLength;
-
-    Vector2 currentPos = startPos;
-    float distanceTraveled = 0;
-
-    rlBegin(RL_LINES);
-    rlColor4ub(color.r, color.g, color.b, color.a);
+    Vector2 delta = { endPos.x - startPos.x, endPos.y - startPos.y };
+    float length = sqrtf(delta.x*delta.x + delta.y*delta.y);
 
-    while (distanceTraveled < lineLength)
+    if ((length > 0) && (thick > 0))
     {
-        // Calculate the end of the current dash
-        float dashEndDist = distanceTraveled + dashSize;
-        if (dashEndDist > lineLength)
-        {
-            dashEndDist = lineLength;
-        }
-
-        Vector2 dashEndPos = { startPos.x + dashEndDist * dirX, startPos.y + dashEndDist * dirY };
+        float scale = thick/(2*length);
 
-        // Draw the dash segment
-        rlVertex2f(currentPos.x, currentPos.y);
-        rlVertex2f(dashEndPos.x, dashEndPos.y);
+        Vector2 radius = { -scale*delta.y, scale*delta.x };
+        Vector2 strip[4] = {
+            { startPos.x - radius.x, startPos.y - radius.y },
+            { startPos.x + radius.x, startPos.y + radius.y },
+            { endPos.x - radius.x, endPos.y - radius.y },
+            { endPos.x + radius.x, endPos.y + radius.y }
+        };
 
-        // Update the distance traveled and move the current position for the next dash
-        distanceTraveled = dashEndDist + whiteSpaceSize;
-        currentPos.x = startPos.x + distanceTraveled * dirX;
-        currentPos.y = startPos.y + distanceTraveled * dirY;
+        DrawTriangleStrip(strip, 4, color);
     }
-
-    rlEnd();
 }
 
 // Draw a line (using gl lines)
@@ -295,26 +268,50 @@ void DrawLineBezier(Vector2 startPos, Vector2 endPos, float thick, Color color)
     DrawTriangleStrip(points, 2*SPLINE_SEGMENT_DIVISIONS + 2, color);
 }
 
-// Draw a line defining thickness
-void DrawLineEx(Vector2 startPos, Vector2 endPos, float thick, Color color)
+// Draw a dashed line
+void DrawLineDashed(Vector2 startPos, Vector2 endPos, int dashSize, int spaceSize, Color color)
 {
-    Vector2 delta = { endPos.x - startPos.x, endPos.y - startPos.y };
-    float length = sqrtf(delta.x*delta.x + delta.y*delta.y);
+    // Calculate the vector and length of the line
+    float dx = endPos.x - startPos.x;
+    float dy = endPos.y - startPos.y;
+    float lineLength = sqrtf(dx*dx + dy*dy);
 
-    if ((length > 0) && (thick > 0))
+    // If the line is too short for dashing or dash size is invalid, draw a solid thick line
+    if ((lineLength < (dashSize + spaceSize)) || (dashSize <= 0))
     {
-        float scale = thick/(2*length);
+        DrawLineV(startPos, endPos, color);
+        return;
+    }
 
-        Vector2 radius = { -scale*delta.y, scale*delta.x };
-        Vector2 strip[4] = {
-            { startPos.x - radius.x, startPos.y - radius.y },
-            { startPos.x + radius.x, startPos.y + radius.y },
-            { endPos.x - radius.x, endPos.y - radius.y },
-            { endPos.x + radius.x, endPos.y + radius.y }
-        };
+    // Calculate the normalized direction vector of the line
+    float invLineLength = 1.0f/lineLength;
+    float dirX = dx*invLineLength;
+    float dirY = dy*invLineLength;
 
-        DrawTriangleStrip(strip, 4, color);
-    }
+    Vector2 currentPos = startPos;
+    float distanceTraveled = 0;
+
+    rlBegin(RL_LINES);
+        rlColor4ub(color.r, color.g, color.b, color.a);
+
+        while (distanceTraveled < lineLength)
+        {
+            // Calculate the end of the current dash
+            float dashEndDist = distanceTraveled + dashSize;
+            if (dashEndDist > lineLength) dashEndDist = lineLength;
+
+            Vector2 dashEndPos = { startPos.x + dashEndDist*dirX, startPos.y + dashEndDist*dirY };
+
+            // Draw the dash segment
+            rlVertex2f(currentPos.x, currentPos.y);
+            rlVertex2f(dashEndPos.x, dashEndPos.y);
+
+            // Update the distance traveled and move the current position for the next dash
+            distanceTraveled = dashEndDist + spaceSize;
+            currentPos.x = startPos.x + distanceTraveled*dirX;
+            currentPos.y = startPos.y + distanceTraveled*dirY;
+        }
+    rlEnd();
 }
 
 // Draw a color-filled circle