1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
// Rendering constants
const RENDER_CONSTANTS = {
VIEWPORT_BUFFER: 100,
SKY_COLORS: {
TOP: '#1a1a2e',
UPPER_MID: '#2d1b3d',
LOWER_MID: '#462639',
BOTTOM: '#1f1f2f'
},
GROUND_COLOR: '#4a4',
DEBUG_FONT: '14px monospace',
DEBUG_COLOR: '#ffffff'
};
// Helper functions for rendering
const createSkyGradient = (ctx, groundY) => {
const gradient = ctx.createLinearGradient(0, 0, 0, groundY);
gradient.addColorStop(0, RENDER_CONSTANTS.SKY_COLORS.TOP);
gradient.addColorStop(0.4, RENDER_CONSTANTS.SKY_COLORS.UPPER_MID);
gradient.addColorStop(0.7, RENDER_CONSTANTS.SKY_COLORS.LOWER_MID);
gradient.addColorStop(1, RENDER_CONSTANTS.SKY_COLORS.BOTTOM);
return gradient;
};
const getViewBounds = (camera) => ({
left: camera.x - RENDER_CONSTANTS.VIEWPORT_BUFFER,
right: camera.x + camera.width + RENDER_CONSTANTS.VIEWPORT_BUFFER,
top: camera.y - RENDER_CONSTANTS.VIEWPORT_BUFFER,
bottom: camera.y + camera.height + RENDER_CONSTANTS.VIEWPORT_BUFFER
});
const isInView = (x, viewBounds) =>
x > viewBounds.left && x < viewBounds.right;
// Layer rendering functions
const renderBackground = (ctx, state, groundY, viewBounds) => {
// Save the current transform
ctx.save();
// Reset transform for viewport-fixed sky
ctx.setTransform(1, 0, 0, 1, 0, 0);
// Sky (fixed to viewport)
ctx.fillStyle = state.cachedGradient;
ctx.fillRect(0, 0, ctx.canvas.width, groundY);
// Restore transform for underground
ctx.restore();
// Underground (follows camera)
ctx.fillStyle = '#000000';
ctx.fillRect(
viewBounds.left,
groundY,
viewBounds.right - viewBounds.left,
ctx.canvas.height
);
};
const renderBackgroundObjects = (ctx, state, groundY, viewBounds) => {
state.world.backgroundTrees
.filter(tree => isInView(tree.x, viewBounds))
.forEach(tree => renderTree(ctx, tree, groundY));
state.world.backgroundRocks
.filter(rock => isInView(rock.x, viewBounds))
.forEach(rock => renderRock(ctx, rock, groundY));
state.world.backgroundGrass
.filter(grass => isInView(grass.x, viewBounds))
.forEach(grass => renderGrass(ctx, grass, groundY, state.time));
};
const renderForegroundObjects = (ctx, state, groundY, viewBounds) => {
state.world.foregroundTrees
.filter(tree => isInView(tree.x, viewBounds))
.forEach(tree => renderTree(ctx, tree, groundY));
state.world.foregroundRocks
.filter(rock => isInView(rock.x, viewBounds))
.forEach(rock => renderRock(ctx, rock, groundY));
state.world.foregroundGrass
.filter(grass => isInView(grass.x, viewBounds))
.forEach(grass => renderGrass(ctx, grass, groundY, state.time));
};
const renderDebugInfo = (ctx, state) => {
ctx.fillStyle = RENDER_CONSTANTS.DEBUG_COLOR;
ctx.font = RENDER_CONSTANTS.DEBUG_FONT;
const text = `x: ${Math.round(state.debug.mouseX)}, y: ${Math.round(state.debug.mouseY)}`;
ctx.fillText(text, 10, ctx.canvas.height - 20);
};
|