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@ -1985,6 +1985,10 @@ static void ReportNewsProductionChangeIndustry(Industry *ind, CargoID type, int
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);
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}
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enum {
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PERCENT_TRANSPORTED_60 = 153,
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};
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/** Change industry production or do closure
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* @param i Industry for which changes are performed
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* @param monthly true if it's the monthly call, false if it's the random call
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@ -2036,18 +2040,23 @@ static void ChangeIndustryProduction(Industry *i, bool monthly)
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if (smooth_economy) {
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closeit = true;
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for (byte j = 0; j < 2 && i->produced_cargo[j] != CT_INVALID; j++){
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uint32 r = Random();
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int old_prod, new_prod, percent;
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int mult = (i->last_month_pct_transported[j] > PERCENT_TRANSPORTED_60) ? 1 : -1;
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new_prod = old_prod = i->production_rate[j];
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if (CHANCE16I(20, 1024, r)) new_prod -= max(((RandomRange(50) + 10) * old_prod) >> 8, 1U);
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/* Chance of increasing becomes better when more is transported */
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if (CHANCE16I(20 + (i->last_month_pct_transported[j] * 20 >> 8), 1024, r >> 16) && !only_decrease) {
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new_prod += max(((RandomRange(50) + 10) * old_prod) >> 8, 1U);
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if (only_decrease || CHANCE16(1, 3)) mult *= -1;
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if (CHANCE16(1, 22)) {
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new_prod += mult * (max(((RandomRange(50) + 10) * old_prod) >> 8, 1U));
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}
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/* Prevent production to overflow or Oil Rig passengers to be over-"produced" */
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new_prod = Clamp(new_prod, 1, 255);
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if (((indspec->behaviour & INDUSTRYBEH_BUILT_ONWATER) != 0) && j == 1)
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new_prod = Clamp(new_prod, 0, 16);
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/* Do not stop closing the industry when it has the lowest possible production rate */
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if (new_prod == old_prod && old_prod > 1) {
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closeit = false;
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@ -2067,7 +2076,7 @@ static void ChangeIndustryProduction(Industry *i, bool monthly)
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} else {
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if (only_decrease || CHANCE16(1, 3)) {
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/* If you transport > 60%, 66% chance we increase, else 33% chance we increase */
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if (!only_decrease && (i->last_month_pct_transported[0] > 153) != CHANCE16(1, 3)) {
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if (!only_decrease && (i->last_month_pct_transported[0] > PERCENT_TRANSPORTED_60) != CHANCE16(1, 3)) {
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mul = 1; // Increase production
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} else {
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div = 1; // Decrease production
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