HUD in Unity for Shift key thrust

  • Create an image element (name it “Frame”) in the canvas and attach a frame’s sprite to it.
  • Create an empty object (name it “ThrustBar”) and drag the image element above it to make it a child of this object.
  • Create another image element (name it “Fill”) and place it within the frame by using the alt + stretch option.
Unity
  • If interested, bring in a visual element in form of an image that can depict a thruster and make it a child of the empty object above as well as align as needed.
Unity
  • Add a slider component to the ThrustBar which is going to allow scaling of fill element.
  • Drag the fill element to the “rect” option of the slider component.
  • For the scale value, choose a number as per preference. (Whole number checkbox shall be clicked if the required change needs to happen in a whole number manner and not a real number.)
Unity
  • Add a script component to the ThrustBar that can contain a method to alter the scale value.
  • The thruster script should have a method to change the value of this slider scale.
C#
  • Drag the slider component to the public variable of this script of type “Slider”.
Unity
  • In the script that handles it, declare a variable of the type “ThrustBar” to get a reference.
public ThrustSlider _healthBar;
  • Create a method to decrement the slider value in the same script using the handle create above. (Do not forget to place a null verifier.)
C#
  • Create a coroutine to increment the slider value when the shift key is released. (A method can not work here because this must happen in parallel.)
  • The coroutine here should check if the value of the slider is less than 1 to decrease the increment speed a bit until it goes past 1 and then shifts gears. (This will stop the player from thrusting constantly.)
C#
  • Finally, use both these in the left shift key method. Also, get a handle on the current value of the slider to compare and alter accordingly.
C#

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