83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
// =========================================
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// | Spacewar-Physics.c |
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// | Copyright (C) 2023, Barra Ó Catháin |
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// | See end of file for copyright notice. |
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// =========================================
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#include "Spacewar-Physics.h"
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void doPhysicsTick(SpacewarState * state)
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{
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double gravityMagnitude, gravityAcceleration;
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for (int shipIndex = 0; shipIndex < 32; shipIndex++)
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{
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SpacewarShipState * currentShip = state->playerStates[shipIndex];
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if (currentShip->inPlay)
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{
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// Calculate Gravity:
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xyVectorBetweenPoints(currentShip->position.xComponent, currentShip->position.yComponent,
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0, 0, currentShip.gravity);
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gravityMagnitude = normalizeXYVector(currentShip.gravity);
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gravityAcceleration = 0;
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// Some maths that felt okay:
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if (gravityMagnitude >= 116)
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{
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gravityAcceleration = pow(2, (3000 / (gravityMagnitude << 1)))) >> 3;
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}
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// We're actually in the black hole; teleport:
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else
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{
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ship->position.xComponent = random() % 8000;
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ship->position.yComponent = random() % 8000;
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ship->velocity.xComponent *= 0.01;
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ship->velocity.yComponent *= 0.01;
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}
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multiplyXYVector(currentShip.gravity, gravityAcceleration);
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// Apply Inputs:
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// Apply Gravity and Velocity to Position:
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addXYVector(currentShip.position, currentShip.gravity);
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// Wrap position to game field:
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if (currentShip->position.xComponent > 8000)
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{
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state->playerStates[shipIndex].position.xComponent = -7999;
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state->playerStates[shipIndex].velocity.xComponent *= 0.9;
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}
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if (currentShip->position.xComponent < -8000)
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{
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state->playerStates[shipIndex].position.xComponent = 7999;
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state->playerStates[shipIndex].velocity.xComponent *= 0.9;
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}
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if (currentShip->position.yComponent > 8000)
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{
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state->playerStates[shipIndex].position.yComponent = -7999;
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state->playerStates[shipIndex].velocity.yComponent *= 0.9;
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}
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if (currentShip->position.yComponent < -8000)
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{
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state->playerStates[shipIndex].position.xComponent = 7999;
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state->playerStates[shipIndex].velocity.yComponent *= 0.9;
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}
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}
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}
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}
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// ========================================================
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// | End of Spacewar-Physics.c, copyright notice follows. |
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// ========================================================
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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