diff --git a/app.c b/app.c
index 1efe61e..253ab75 100644
--- a/app.c
+++ b/app.c
@@ -52,9 +52,9 @@ void key_released(int key)
 
 v2 velocity = {0, 0};
 
-void reset_velocity(void)
+void set_velocity(float x, float y)
 {
-    velocity = (v2){0, 0};
+    velocity = (v2){x, y};
 }
 
 void rebondi(v2 *pos, int scale)
diff --git a/build.sh b/build.sh
index e103d18..f0958d6 100755
--- a/build.sh
+++ b/build.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-export_sym="init go key_pressed key_released reset_velocity BUFFER width height"
+export_sym="init go key_pressed key_released set_velocity BUFFER width height"
 export_cmd=""
 for e in $export_sym; do
     export_cmd="$export_cmd -Wl,--export=$e";
diff --git a/load.js b/load.js
index 0e45823..a8c24fa 100644
--- a/load.js
+++ b/load.js
@@ -17,7 +17,7 @@ window.onload = () => {
         scale_p.innerText = "scale: " + scale;
     }
     reset_but.onclick = () => {
-        global_instance.exports.reset_velocity();
+        global_instance.exports.set_velocity(0, 0);
     }
 };
 
diff --git a/penger.png b/penger.png
index 2208b1d..58c50f3 100644
Binary files a/penger.png and b/penger.png differ
diff --git a/png2c.c b/png2c.c
index e235235..f545b0f 100644
--- a/png2c.c
+++ b/png2c.c
@@ -26,7 +26,7 @@ int main(int argc, const char *argv[])
     for (int y = 0; y < height; y++) {
         printf("    ");
         for (int i = 0; i < width; i++) {
-            printf("0x%08X,", data[y*height + i]);
+            printf("0x%08X,", data[y*width + i]);
         }
         printf("\n");
     }