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TODO:

• init buffers and local cache
• Program::eventhandler -> detect mouse drag
• Mouse.cpp
  • handleMouseDown()
  • getMousePos()
• setup shaders
• particle auto-update with mouse info
• render
• update

DEBUG

• testing particles data are auto-updated for each frame on CPU side
• pass camera matrix as uniform
• test data is actually passed to GPU
• test gl draw procedure is correct.
• fix click is off when cam is not centered
• color
• slow down resistance
• why it went crazy on long click?

Analysis

Animation

Particle movement is caused by gravitational force, the stronger the force the darker the color of its appearance.

• Click generates a force onto surrounding particles and leaving those particles with an initial speed the same as mouse moving speed;
• Particle color is determined by the acceleration speed.
• Acceleration is caused by gravitational force to the mouse. i.e. The closer a particle to the mouse(when clicked down) position, the bigger its acceleration.
  • If the click holds, each particle's the acceleration vector (in terms of both direction and magnitude) keeps changing towards the the pointer for every frame;
    (e.g. new_acceleration = current_acceleration + new_gravitational_acceleration)
  • If mouse releases, the particle will slow down, due to a constant resistence force, to stationary.

Interactivity

Mouse

Control	Description
Scroll Wheel	Zoom In/Out
Click	Applys gratational force to surrounding particles

Keyboard

Control	Description
Left⇧	Zoom In
Left⌃	Zoom Out
←, ↑, →, ↓	Move Around

Implementation

Structs

1. Particle

Particle
vec2 acceleration
vec2 speed
vec2 pos

2. MouseDown

MouseDown
vec2 pos

Globals/Constants

All constants are in constants.h file.