add lines bezier example

examples/shapes/lines_bezier.zig

@@ -0,0 +1,75 @@
+const rl = @import("raylib");
+
+fn collisionFmt(isColliding: bool) f32 {
+    if (isColliding) return 14.0;
+    return 8.0;
+}
+
+fn movingFmt(isMoving: bool) rl.Color {
+    if (isMoving) return rl.Color.red;
+    return rl.Color.blue;
+}
+
+pub fn main() anyerror!void {
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const screenWidth = 800;
+    const screenHeight = 450;
+
+    //rl.setConfigFlags(@enumFromInt(rl.ConfigFlags.flag_msaa_4x_hint));
+    rl.initWindow(screenWidth, screenHeight, "raylib-zig [shapes] example - cubic-bezier lines");
+    defer rl.closeWindow(); // Close window and OpenGL context
+
+    var startPoint = rl.Vector2{ .x = 30, .y = 30 };
+    var endPoint = rl.Vector2{ .x = screenWidth - 30, .y = screenHeight - 30 };
+    var moveStartPoint = false;
+    var moveEndPoint = false;
+
+    rl.setTargetFPS(60); // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!rl.windowShouldClose()) { // Detect window close button or ESC key
+        // Update
+        //----------------------------------------------------------------------------------
+        const mouse: rl.Vector2 = rl.getMousePosition();
+
+        if (rl.checkCollisionPointCircle(mouse, startPoint, 10.0) and rl.isMouseButtonDown(.left)) {
+            moveStartPoint = true;
+        } else if (rl.checkCollisionPointCircle(mouse, endPoint, 10.0) and rl.isMouseButtonDown(.left)) {
+            moveEndPoint = true;
+        }
+
+        if (moveStartPoint) {
+            startPoint = mouse;
+            if (rl.isMouseButtonReleased(.left)) {
+                moveStartPoint = false;
+            }
+        }
+
+        if (moveEndPoint) {
+            endPoint = mouse;
+            if (rl.isMouseButtonReleased(.left)) {
+                moveEndPoint = false;
+            }
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        rl.beginDrawing();
+        defer rl.endDrawing();
+
+        rl.clearBackground(rl.Color.ray_white);
+
+        rl.drawText("MOVE START-END POINTS WITH MOUSE", 15, 20, 20, rl.Color.gray);
+
+        // Draw line Cubic Bezier, in-out interpolation (easing), no control points
+        rl.drawLineBezier(startPoint, endPoint, 4.0, rl.Color.blue);
+
+        // Draw start-end spline circles with some details
+        rl.drawCircleV(startPoint, collisionFmt(rl.checkCollisionPointCircle(mouse, startPoint, 10.0)), movingFmt(moveStartPoint));
+        rl.drawCircleV(endPoint, collisionFmt(rl.checkCollisionPointCircle(mouse, endPoint, 10.0)), movingFmt(moveEndPoint));
+        //----------------------------------------------------------------------------------
+    }
+}