From 1f36b993d603c56251aa15eb6edc6b92ecf599ae Mon Sep 17 00:00:00 2001
From: Stijn Buys <ingar@osirion.org>
Date: Thu, 7 Aug 2008 14:15:17 +0000
Subject: off-screen target indicators

---
 src/client/targets.cc | 59 ++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 56 insertions(+), 3 deletions(-)

(limited to 'src/client/targets.cc')

diff --git a/src/client/targets.cc b/src/client/targets.cc
index 1fc7ec9..b913d55 100644
--- a/src/client/targets.cc
+++ b/src/client/targets.cc
@@ -332,7 +332,53 @@ void render_entity_sound(core::Entity *entity)
 	}
 }
 
-//core::Entity *entity = current_target;
+void draw_entity_offscreen_target(core::Entity *entity, bool is_active_target)
+{
+
+	math::Vector3f target(entity->state()->location() - render::Camera::eye());
+	target = render::Camera::axis().transpose() * target;
+
+	float cx = 0;
+	float cy = 0;
+
+	if ( target.y*target.y + target.z*target.z < 0.0001 ) {
+		// X - bound, behind (front is visible)
+		cx = 0.0f;
+		cy = -0.5f;
+	
+	} else if (fabs(target.y) > fabs(target.z)) {
+		// Y-bound
+		cx = math::sgnf(target.y) * 0.5f;
+		cy = 0.5f * target.z / fabs(target.y);
+	} else {
+		// Z-bound
+		cx = 0.5f * target.y / fabs(target.z);
+		cy = math::sgnf(target.z) * 0.5f;
+	}
+
+	const float r = 16;
+	cx = (0.5f - cx) * (float) video::width;
+	cy = (0.5f - cy) * (float)video::height;
+
+	render::gl::disable(GL_TEXTURE_2D);
+	render::gl::color(0, 0, 0, 1);
+	render::gl::begin(render::gl::LineLoop);
+	glVertex3f(cx+r, cy+2, 0);
+	glVertex3f(cx, cy+r+2, 0);
+	glVertex3f(cx-r, cy+2, 0);
+	glVertex3f(cx, cy-r+2, 0);
+	render::gl::end();
+
+	render::gl::color(1, 1, 1, 1);
+	render::gl::begin(render::gl::LineLoop);
+	glVertex3f(cx+r, cy, 0);
+	glVertex3f(cx, cy+r, 0);
+	glVertex3f(cx-r, cy, 0);
+	glVertex3f(cx, cy-r, 0);
+	render::gl::end();
+	render::gl::enable(GL_TEXTURE_2D);
+}
+
 void draw_entity_target(core::Entity *entity, bool is_active_target)
 {
 	using math::Vector3f;
@@ -343,10 +389,12 @@ void draw_entity_target(core::Entity *entity, bool is_active_target)
 
 	// don't draw target if it is outside the visible cone
 	Vector3f target(entity->state()->location() - render::Camera::eye());
-	if (math::dotproduct(render::Camera::axis().forward(), Vector3f::normalized(target)) < 0.75 )
+	if (math::dotproduct(render::Camera::axis().forward(), Vector3f::normalized(target)) < 0.75 ) {
+		draw_entity_offscreen_target(entity, is_active_target);
 		return;
+	}
 
-	// transform the target into the normalized coordinate system
+	// transform the target into the camera coordinate system
 	target = render::Camera::axis().transpose() * target;
 
 	// calculate the intersection between the line (0,0,0)-target and the frustum front
@@ -356,6 +404,11 @@ void draw_entity_target(core::Entity *entity, bool is_active_target)
 	float cx = video::width * (0.5 - center.y);
 	float cy = video::height * (0.5 - center.z  * render::Camera::aspect());
 
+	if ((cx < 0 ) || (cy < 0) || (cx > video::width) || (cy > video::height)) {
+		draw_entity_offscreen_target(entity, is_active_target);
+		return;
+	}
+
 	const float pointer_size = 48.0f;
 	float r = pointer_size;
 	if (!is_active_target)
-- 
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