66 lines
2.0 KiB
Plaintext
66 lines
2.0 KiB
Plaintext
//this is one layer
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import standard;
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import engine;
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import node;
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//TODO: replace with an empty node function (polyfill)
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fn loadChildEmpty(parent: opaque) {
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var child: opaque = loadNode("scripts:/empty.toy");
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parent.pushNode(child);
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return child;
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}
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fn onLoad(node: opaque) {
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//load the child node, with the tiling back image
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node.loadChildEmpty();
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}
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fn onInit(node: opaque) {
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node.getChildNode(0).loadTexture("sprites:/tile-background.png");
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}
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//drawing util
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fn drawLayer(node: opaque, camX, camY, camW, camH, depth) {
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//get the constants from root
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var root: opaque = getRootNode();
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var tileWidth: int const = root.callNodeFn("getTileWidth");
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var tileHeight: int const = root.callNodeFn("getTileHeight");
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var roomWidth: int const = root.callNodeFn("getRoomWidth");
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var roomHeight: int const = root.callNodeFn("getRoomHeight");
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var levelXCount: int const = root.callNodeFn("getLevelXCount");
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var levelYCount: int const = root.callNodeFn("getLevelYCount");
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//calc the modifier ratio to offset things
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var mod: float = float tileWidth / (tileWidth - depth);
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var tileWidth_mod: float = tileWidth * mod;
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var tileHeight_mod: float = tileHeight * mod;
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var camX_mod: float = (camX - camW) * mod + camW/2;
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var camY_mod: float = (camY - camH) * mod + camH/2;
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//calc the region to render
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var lowerX: int = round((camX - camW/2.0) / tileWidth);
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var upperX: int = round((camX - camW*1.5) / tileWidth);
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var lowerY: int = round((camY - camH/2.0) / tileHeight);
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var upperY: int = round((camY - camH*1.5) / tileHeight);
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//bounds check
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lowerX = max(0, abs(lowerX));
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upperX = min(upperX < 0 ? abs(upperX) : 0, levelXCount * roomWidth);
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lowerY = max(0, abs(lowerY));
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upperY = min(upperY < 0 ? abs(upperY) : 0, levelYCount * roomHeight);
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//render each tile
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for (var j = lowerY; j <= upperY; j++) {
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for (var i = lowerX; i <= upperX; i++) {
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node.getChildNode(0).drawNode(round(camX_mod + i * tileWidth_mod), round(camY_mod + j * tileHeight_mod), round(tileWidth_mod), round(tileHeight_mod));
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}
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}
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}
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