C#•2y ago

❔ Circle line-segment collision detection

Tried following this https://stackoverflow.com/questions/1073336/circle-line-segment-collision-detection-algorithm

                    //item is line can be horizontal or vertical
                    float dx = item.X2- item.Position.X;  
                    float dy = item.Y2 - item.Position.Y; 

                    float a = dx * dx + dy * dy;
                    float b = 2 * (dx * (item.Position.X - ball.Position.X) + dy * (item.Position.Y - ball.Position.Y));
                    float c = (item.Position.X - ball.Position.X) * (item.Position.X - ball.Position.X) + (item.Position.Y - ball.Position.Y) * (item.Position.Y - ball.Position.Y) - ball.Radius * ball.Radius;

                    float discriminant = b * b - 4 * a * c;

                    //item is line can be horizontal or vertical
                    float dx = item.X2- item.Position.X;  
                    float dy = item.Y2 - item.Position.Y; 

                    float a = dx * dx + dy * dy;
                    float b = 2 * (dx * (item.Position.X - ball.Position.X) + dy * (item.Position.Y - ball.Position.Y));
                    float c = (item.Position.X - ball.Position.X) * (item.Position.X - ball.Position.X) + (item.Position.Y - ball.Position.Y) * (item.Position.Y - ball.Position.Y) - ball.Radius * ball.Radius;

                    float discriminant = b * b - 4 * a * c;

I dont know if what I tried is accurate to what the link answer does.

1 Reply

Accord•2y ago

Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.

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❔ Circle line-segment collision detection