56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
#include "horizon_line.h"
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HorizonLine horizonLine;
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void horizonLineInit() {
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horizonLine.width = HORIZON_LINE_WIDTH;
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horizonLine.height = HORIZON_LINE_HEIGHT;
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horizonLine.sourceXPos[0] = ATLAS_HORIZON_X;
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horizonLine.sourceXPos[1] = ATLAS_HORIZON_X + horizonLine.width;
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horizonLine.bumpThreshold = 0.5;
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horizonLine.xPos[0] = 0;
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horizonLine.xPos[1] = horizonLine.width;
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horizonLine.yPos = HORIZON_LINE_YPOS;
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horizonLineDraw();
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}
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void horizonLineDraw() {
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//printf("horizonLineDraw(); xPos[0] = %d, xPos[1] = %d, yPos = %d, width = %d, height = %d\n", horizonLine.xPos[0], horizonLine.xPos[1], horizonLine.yPos, horizonLine.width, horizonLine.height);
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graphicsBlitAtlasImage(horizonLine.sourceXPos[0], ATLAS_HORIZON_Y, horizonLine.xPos[0], horizonLine.yPos, horizonLine.width, horizonLine.height, false);
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graphicsBlitAtlasImage(horizonLine.sourceXPos[1], ATLAS_HORIZON_Y, horizonLine.xPos[1], horizonLine.yPos, horizonLine.width, horizonLine.height, false);
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}
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int horizonLineGetRandomType() {
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return (double)rand() / RAND_MAX > horizonLine.bumpThreshold ? horizonLine.width : 0;
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}
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void horizonLineUpdateXPos(int pos, int increment) {
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int line1 = pos;
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int line2 = pos == 0 ? 1 : 0;
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horizonLine.xPos[line1] -= increment;
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horizonLine.xPos[line2] = horizonLine.xPos[line1] + horizonLine.width;
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if (horizonLine.xPos[line1] <= -horizonLine.width) {
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horizonLine.xPos[line1] += horizonLine.width * 2;
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horizonLine.xPos[line2] = horizonLine.xPos[line1] - horizonLine.width;
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horizonLine.sourceXPos[line1] = horizonLineGetRandomType() + ATLAS_HORIZON_X;
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}
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}
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void horizonLineUpdate(int deltaTime, double speed) {
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int increment = floor(speed * (FPS / 1000.0) * deltaTime);
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if (horizonLine.xPos[0] <= 0) {
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horizonLineUpdateXPos(0, increment);
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}
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else {
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horizonLineUpdateXPos(1, increment);
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}
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horizonLineDraw();
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}
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void horizonLineReset() {
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horizonLine.xPos[0] = 0;
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horizonLine.xPos[1] = horizonLine.width;
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}
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