Magnum::Timeline class

Basic usage

Construct the timeline on initialization so the instance is available for whole lifetime of the application. Call start() before first draw event is performed, after everything is properly initialized.

In your draw event implementation don't forget to call nextFrame() after buffer swap. You can use previousFrameDuration() to compute animation speed. To limit application framerate you can use Platform::*Application::setSwapInterval() or Platform::*Application::setMinimalLoopPeriod(). Note that on Emscripten the framerate is governed by browser and you can't do anything about it.

Example usage:

MyApplication::MyApplication(const Arguments& arguments): Platform::Application{arguments} {
    // Initialization ...

    // Enable VSync or set minimal loop period for the application, if
    // needed/applicable ...

    timeline.start();
}

void MyApplication::drawEvent() {
    // Distance of object travelling at speed of 15 units per second
    Float distance = 15.0f*timeline.previousFrameDuration();

    // Move object, draw ...

    swapBuffers();
    redraw();
    timeline.nextFrame();
}

Constructors, destructors, conversion operators

Timeline() explicit

Constructor.

Public functions

void start()

Start timeline.

void stop()

Stop timeline.

void nextFrame()

Advance to next frame.

auto previousFrameTime() const -> Float

Time at previous frame (in seconds)

auto previousFrameDuration() const -> Float

Duration of previous frame (in seconds)

Function documentation