41 lines
1.1 KiB
JavaScript
41 lines
1.1 KiB
JavaScript
function updateOrbital()
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{
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if( !getGUIObjectByName( 'arena' ).hidden )
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{
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g_ballx += g_balldx;
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g_bally += g_balldy;
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if (g_ballx > 600) {
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g_balldx *= -0.9;
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g_ballx = 600-(g_ballx-600);
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}
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else if (g_ballx < 0) {
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g_balldx *= -0.9;
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g_ballx = -g_ballx;
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}
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if (g_bally > 400) {
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g_balldy *= -0.9;
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g_bally = 400-(g_bally-400);
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}
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else if (g_bally < 0) {
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g_balldy *= -0.9;
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g_bally = -g_bally;
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}
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// Gravitate towards the mouse
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var vect_x = g_ballx-g_mousex;
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var vect_y = g_bally-g_mousey;
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var dsquared = vect_x*vect_x + vect_y*vect_y;
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if (dsquared < 1000) dsquared = 1000;
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var force = 10000.0 / dsquared;
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var mag = Math.sqrt(dsquared);
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vect_x /= mag; vect_y /= mag;
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g_balldx -= force * vect_x;
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g_balldy -= force * vect_y;
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var ball = getGUIObjectByName('ball');
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var r=5;
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ball.size = new GUISize(g_ballx-r, g_bally-r, g_ballx+r, g_bally+r);
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}
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}
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