100 lines
1.9 KiB
C
100 lines
1.9 KiB
C
/*
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Copyright (C) 2018 Parallel Realities
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (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.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "camera.h"
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void clipCamera(void);
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void cameraTrack(Entity *e)
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{
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camera.x = (int) e->x + e->w / 2;
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camera.y = (int) e->y + e->h / 2;
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camera.x -= (app.config.winWidth / 2);
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camera.y -= (app.config.winHeight / 2);
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clipCamera();
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}
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float cameraChase(Entity *e, int maxSpeed)
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{
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float x, y, tx, ty, diffX, diffY, dist;
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x = camera.x;
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y = camera.y;
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tx = e->x - (app.config.winWidth / 2);
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ty = e->y - (app.config.winHeight / 2);
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diffX = fabs(tx - x);
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diffY = fabs(ty - y);
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dist = MAX(diffX, diffY);
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diffX /= 20;
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diffY /= 20;
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diffX = MAX(0, MIN(maxSpeed, diffX));
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diffY = MAX(0, MIN(maxSpeed, diffY));
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if (x > tx)
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{
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x -= diffX;
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}
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if (x < tx)
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{
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x += diffX;
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}
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if (y > ty)
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{
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y -= diffY;
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}
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if (y < ty)
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{
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y += diffY;
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}
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camera.x = (int) x;
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camera.y = (int) y;
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clipCamera();
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return dist;
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}
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void clipCamera(void)
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{
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camera.x = (int) limit(camera.x, world.map.bounds.x, world.map.bounds.w);
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camera.y = (int) limit(camera.y, world.map.bounds.y, world.map.bounds.h);
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}
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int isOnScreen(Entity *e)
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{
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int x, y;
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x = (-camera.x + e->x);
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y = (-camera.y + e->y);
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return (x >= 0 && y >= 0 && x - e->w < app.config.winWidth && y - e->h < app.config.winHeight);
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}
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