# HG changeset patch
# User Thibaut Girka <thib@sitedethib.com>
# Date 1329760687 -3600
# Node ID ab618c2bbce8c158abc437c3513d2d234531ad05
# Parent  3a81b607f974467ecd8e37f2ce8d8ab1e14ce011
Implement laser collision.

diff --git a/pytouhou/game/game.py b/pytouhou/game/game.py
--- a/pytouhou/game/game.py
+++ b/pytouhou/game/game.py
@@ -252,6 +252,16 @@ class Game(object):
             gx1, gx2 = px - ghalf_size, px + ghalf_size
             gy1, gy2 = py - ghalf_size, py + ghalf_size
 
+            for laser in self.lasers:
+                if laser.check_collision((px, py)):
+                    if player.state.invulnerable_time == 0:
+                        player.collide()
+                elif laser.check_grazing((px, py)):
+                    player.state.graze += 1 #TODO
+                    player.state.score += 500 #TODO
+                    self.modify_difficulty(+6) #TODO
+                    self.new_particle((px, py), 0, .8, 192) #TODO
+
             for bullet in self.bullets:
                 half_size = bullet.hitbox_half_size
                 bx, by = bullet.x, bullet.y
diff --git a/pytouhou/game/laser.py b/pytouhou/game/laser.py
--- a/pytouhou/game/laser.py
+++ b/pytouhou/game/laser.py
@@ -100,6 +100,46 @@ class Laser(object):
         self._anmrunner.run_frame()
 
 
+    def _check_collision(self, point, border_size):
+        x, y = point[0] - self.base_pos[0], point[1] - self.base_pos[1]
+        dx, dy = cos(self.angle), sin(self.angle)
+        dx2, dy2 = -dy, dx
+
+        length = min(self.end_offset - self.start_offset, self.max_length)
+        offset = self.end_offset - length - border_size / 2.
+        end_offset = self.end_offset + border_size / 2.
+        half_width = self.width / 4. + border_size / 2.
+
+        c1 = dx * offset - dx2 * half_width, dy * offset - dy2 * half_width
+        c2 = dx * offset + dx2 * half_width, dy * offset + dy2 * half_width
+        c3 = dx * end_offset + dx2 * half_width, dy * end_offset + dy2 * half_width
+        vx, vy = x - c2[0], y - c2[1]
+        v1x, v1y = c1[0] - c2[0], c1[1] - c2[1]
+        v2x, v2y = c3[0] - c2[0], c3[1] - c2[1]
+
+        return (0 <= vx * v1x + vy * v1y <= v1x * v1x + v1y * v1y
+                and 0 <= vx * v2x + vy * v2y <= v2x * v2x + v2y * v2y)
+
+
+    def check_collision(self, point):
+        if self.state != STARTED:
+            return False
+
+        return self._check_collision(point, 2.5)
+
+
+    def check_grazing(self, point):
+        #TODO: quadruple check!
+        if self.state == STOPPING and self.frame >= self.grazing_extra_duration:
+            return False
+        if self.state == STARTING and self.frame <= self.grazing_delay:
+            return False
+        if self.frame % 12 != 0:
+            return False
+
+        return self._check_collision(point, 96 + 2.5)
+
+
     def get_bullets_pos(self):
         #TODO: check
         length = min(self.end_offset - self.start_offset, self.max_length)
@@ -111,6 +151,7 @@ class Laser(object):
 
 
     def cancel(self):
+        self.grazing_extra_duration = 0
         if self.state != STOPPING:
             self.frame = 0
             self.state = STOPPING