Add code to limit paddle speed.

Signed-off-by: Matt Turner <mattst88@gmail.com>

1 files changed, 34 insertions, 2 deletions

diff --git a/paddle.c b/paddle.c
index 18b9962..7dcb2f2 100644
--- a/paddle.c
+++ b/paddle.c
@@ -1,3 +1,5 @@
+#include <math.h>
+
 #include "SDL.h"
 #include "SDL_opengl.h"
 
@@ -74,6 +76,11 @@ GLPong_PaddleInit(Paddle_t * paddle, GLfloat z, GLuint texture) {
 
 void
 GLPong_PaddleMove(Paddle_t * paddle, GLfloat x, GLfloat y) {
+	GLfloat old_x = paddle->coord.x;
+	GLfloat old_y = paddle->coord.y;
+	GLfloat mouse_x;
+	GLfloat mouse_y;
+
 	/* clamp paddle to border */
 	if (x <= -1.5f + (paddle->w / 2.0f)) {
 		x = -1.5f + (paddle->w / 2.0f);
@@ -87,6 +94,31 @@ GLPong_PaddleMove(Paddle_t * paddle, GLfloat x, GLfloat y) {
 		y = 1.0f - (paddle->h / 2.0f);
 	}
 
-	paddle->coord.x = x - (paddle->w / 2.0f);
-	paddle->coord.y = -(y + (paddle->h / 2.0f));
+	mouse_x = x - (paddle->w / 2.0f);
+	mouse_y = -(y + (paddle->h / 2.0f));
+	printf("(mouse_x, mouse_y) = (%.3f, %.3f)\n", mouse_x, mouse_y);
+
+	printf("x diff is %f\n", fabs(mouse_x - old_x));
+
+	if (fabs(mouse_x - old_x) > 0.33f / 2.0f) {
+		if (mouse_x > old_x) {
+			paddle->coord.x += 0.33f / 2.0f;
+		} else {
+			paddle->coord.x -= 0.33f / 2.0f;
+		}
+	} else {
+		paddle->coord.x = mouse_x;
+	}
+
+	printf("y diff is %f\n", fabs(mouse_y - old_y));
+
+	if (fabs(mouse_y - old_y) > 0.25f / 2.0f) {
+		if (mouse_y > old_y) {
+			paddle->coord.y += 0.25f / 2.0f;
+		} else {
+			paddle->coord.y -= 0.25f / 2.0f;
+		}
+	} else {
+		paddle->coord.y = mouse_y;
+	}
 }