tiny-tiger/index.html at main · adrocic/tiny-tiger · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Tiny Tiger - 2D Game Engine Demo</title>
    <style>
        body {
            background-color: #0f0f28;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            margin: 0;
            font-family: sans-serif;
            color: #ffffff;
        }

        h1 {
            margin-bottom: 16px;
            font-size: 2rem;
            letter-spacing: 2px;
        }

        #gameCanvas {
            border: 3px solid #e94560;
            display: block;
        }

        #instructions-panel {
            margin-top: 20px;
            text-align: center;
            color: #aaaacc;
            line-height: 1.8;
        }

        #instructions-panel strong {
            color: #e94560;
        }
    </style>
</head>
<body>
    <h1>&#x1F42F; Tiny Tiger Demo</h1>
    <canvas id="gameCanvas"></canvas>
    <div id="instructions-panel">
        <p>Move the red square with <strong>Arrow Keys</strong> or <strong>WASD</strong></p>
        <p>Left-click anywhere on the canvas to move the green target circle</p>
        <p>Hold <strong>Left Mouse Button</strong> to turn the player orange &nbsp;|&nbsp; Hold <strong>Space</strong> to pulse</p>
    </div>

    <script src="dist/tiny_tiger.js"></script>
    <script>
        Module.onRuntimeInitialized = function () {

            const canvasWidthInPixels = 800;
            const canvasHeightInPixels = 600;

            const engineInstance = new Module.Engine(canvasWidthInPixels, canvasHeightInPixels);
            const rendererReference = engineInstance.getRenderer();
            const keyboardInputReference = engineInstance.getKeyboardInput();
            const mouseInputReference = engineInstance.getMouseInput();

            const playerWidthInPixels = 50;
            const playerHeightInPixels = 50;
            const playerMovementSpeedInPixelsPerSecond = 220;

            let playerXPosition = (canvasWidthInPixels / 2) - (playerWidthInPixels / 2);
            let playerYPosition = (canvasHeightInPixels / 2) - (playerHeightInPixels / 2);

            let targetCircleXPosition = 150;
            let targetCircleYPosition = 150;
            const targetCircleRadius = 28;

            let playerPulseTimer = 0;

            const darkBackgroundColor = new Module.Color(15, 15, 40);
            const playerFillColor = new Module.Color(233, 69, 96);
            const playerBorderColor = new Module.Color(255, 150, 165);
            const targetFillColor = new Module.Color(80, 200, 120);
            const targetBorderColor = new Module.Color(200, 255, 220);
            const whiteColor = new Module.Color(255, 255, 255);
            const yellowColor = new Module.Color(255, 220, 80);
            const labelTextColor = new Module.Color(180, 180, 220);

            engineInstance.setUpdateCallback(function (deltaTimeInSeconds) {

                const movementDistanceThisFrame = playerMovementSpeedInPixelsPerSecond * deltaTimeInSeconds;

                const isMovingLeft = keyboardInputReference.isKeyCurrentlyHeld('ArrowLeft') ||
                                     keyboardInputReference.isKeyCurrentlyHeld('a');
                const isMovingRight = keyboardInputReference.isKeyCurrentlyHeld('ArrowRight') ||
                                      keyboardInputReference.isKeyCurrentlyHeld('d');
                const isMovingUp = keyboardInputReference.isKeyCurrentlyHeld('ArrowUp') ||
                                   keyboardInputReference.isKeyCurrentlyHeld('w');
                const isMovingDown = keyboardInputReference.isKeyCurrentlyHeld('ArrowDown') ||
                                     keyboardInputReference.isKeyCurrentlyHeld('s');

                if (isMovingLeft) {
                    playerXPosition = playerXPosition - movementDistanceThisFrame;
                }
                if (isMovingRight) {
                    playerXPosition = playerXPosition + movementDistanceThisFrame;
                }
                if (isMovingUp) {
                    playerYPosition = playerYPosition - movementDistanceThisFrame;
                }
                if (isMovingDown) {
                    playerYPosition = playerYPosition + movementDistanceThisFrame;
                }

                if (mouseInputReference.wasMouseButtonPressedThisFrame(0)) {
                    targetCircleXPosition = mouseInputReference.getCursorXPosition();
                    targetCircleYPosition = mouseInputReference.getCursorYPosition();
                }
                const isSpaceHeld = keyboardInputReference.isKeyCurrentlyHeld(' ');
                if (isSpaceHeld) {
                    playerPulseTimer = playerPulseTimer + deltaTimeInSeconds * 6;
                } else {
                    playerPulseTimer = 0;
                }

                const leftBoundary = 0;
                const rightBoundary = canvasWidthInPixels - playerWidthInPixels;
                const topBoundary = 0;
                const bottomBoundary = canvasHeightInPixels - playerHeightInPixels;

                if (playerXPosition < leftBoundary) {
                    playerXPosition = leftBoundary;
                }
                if (playerXPosition > rightBoundary) {
                    playerXPosition = rightBoundary;
                }
                if (playerYPosition < topBoundary) {
                    playerYPosition = topBoundary;
                }
                if (playerYPosition > bottomBoundary) {
                    playerYPosition = bottomBoundary;
                }
            });

            engineInstance.setDrawCallback(function () {

                rendererReference.clearScreen(darkBackgroundColor);

                rendererReference.drawFilledCircle(targetCircleXPosition, targetCircleYPosition, targetCircleRadius, targetFillColor);
                rendererReference.drawOutlinedCircle(targetCircleXPosition, targetCircleYPosition, targetCircleRadius, targetBorderColor, 2);
                rendererReference.drawTextString('target', targetCircleXPosition - 16, targetCircleYPosition + targetCircleRadius + 16, 14, targetBorderColor);

                const pulseOffsetAmount = Math.sin(playerPulseTimer) * 8;
                const currentPlayerWidth = playerWidthInPixels + pulseOffsetAmount;
                const currentPlayerHeight = playerHeightInPixels + pulseOffsetAmount;
                const adjustedPlayerX = playerXPosition - (pulseOffsetAmount / 2);
                const adjustedPlayerY = playerYPosition - (pulseOffsetAmount / 2);

                const isLeftMouseButtonHeld = mouseInputReference.isMouseButtonHeld(0);
                const activePlayerFillColor = isLeftMouseButtonHeld
                    ? new Module.Color(255, 160, 80)
                    : playerFillColor;

                rendererReference.drawFilledRectangle(adjustedPlayerX, adjustedPlayerY, currentPlayerWidth, currentPlayerHeight, activePlayerFillColor);
                rendererReference.drawOutlinedRectangle(adjustedPlayerX, adjustedPlayerY, currentPlayerWidth, currentPlayerHeight, playerBorderColor, 2);

                const distanceToTargetX = targetCircleXPosition - (playerXPosition + playerWidthInPixels / 2);
                const distanceToTargetY = targetCircleYPosition - (playerYPosition + playerHeightInPixels / 2);
                const totalDistanceToTarget = Math.sqrt(distanceToTargetX * distanceToTargetX + distanceToTargetY * distanceToTargetY);

                if (totalDistanceToTarget < 200) {
                    const playerCenterX = playerXPosition + playerWidthInPixels / 2;
                    const playerCenterY = playerYPosition + playerHeightInPixels / 2;
                    rendererReference.drawLine(playerCenterX, playerCenterY, targetCircleXPosition, targetCircleYPosition, yellowColor, 1);
                }

                const currentFramesPerSecond = engineInstance.deltaTimeSinceLastFrame > 0
                    ? Math.round(1.0 / engineInstance.deltaTimeSinceLastFrame)
                    : 0;

                rendererReference.drawTextString('Tiny Tiger Engine', 10, 28, 22, whiteColor);
                rendererReference.drawTextString('FPS: ' + currentFramesPerSecond, 10, 54, 16, labelTextColor);
                rendererReference.drawTextString('Player: (' + Math.round(playerXPosition) + ', ' + Math.round(playerYPosition) + ')', 10, 74, 16, labelTextColor);

                const distanceDisplayValue = Math.round(totalDistanceToTarget);
                rendererReference.drawTextString('Distance to target: ' + distanceDisplayValue, 10, 94, 16, labelTextColor);
            });

            engineInstance.run();
        };
    </script>
</body>
</html>