Function setupDebugDraw

plugins/box2d.js:2010–2076

()

    
    // box2d debug drawing
    function setupDebugDraw()
    {
        // setup debug draw
        const debugLineWidth = .1;
        const debugDraw = new box2d.instance.JSDraw();
        const box2dColor = (c)=> new Color(c.get_r(), c.get_g(), c.get_b());
        const box2dColorPointer = (c)=>
            box2dColor(box2d.instance.wrapPointer(c, box2d.instance.b2Color));
        const getDebugColor = (color)=>box2dColorPointer(color).scale(1,.8);
        const getPointsList = (vertices, vertexCount)=>
        {
            const points = [];
            for (let i=vertexCount; i--;)
                points.push(box2d.vec2FromPointer(vertices+i*8));
            return points;
        }
        debugDraw.DrawSegment = function(point1, point2, color)
        {
            color = getDebugColor(color);
            point1 = box2d.vec2FromPointer(point1);
            point2 = box2d.vec2FromPointer(point2);
            drawLine(point1, point2, debugLineWidth, color, vec2(), 0, false);
        };
        debugDraw.DrawPolygon = function(vertices, vertexCount, color)
        {
            color = getDebugColor(color);
            const points = getPointsList(vertices, vertexCount);
            drawPoly(points, CLEAR_WHITE, debugLineWidth, color, vec2(), 0, false);
        };
        debugDraw.DrawSolidPolygon = function(vertices, vertexCount, color)
        {
            color = getDebugColor(color);
            const points = getPointsList(vertices, vertexCount);
            drawPoly(points, color, 0, color, vec2(), 0, false);
        };
        debugDraw.DrawCircle = function(center, radius, color)
        {
            color = getDebugColor(color);
            center = box2d.vec2FromPointer(center);
            drawCircle(center, radius*2, CLEAR_WHITE, debugLineWidth, color, false);
        };
        debugDraw.DrawSolidCircle = function(center, radius, axis, color)
        {
            color = getDebugColor(color);
            center = box2d.vec2FromPointer(center);
            axis = box2d.vec2FromPointer(axis).scale(radius);
            drawCircle(center, radius*2, color, debugLineWidth, color, false);
            drawLine(vec2(), axis, debugLineWidth, color, center, 0, false);
        };
        debugDraw.DrawTransform = function(transform)
        {
            transform = box2d.instance.wrapPointer(transform, box2d.instance.b2Transform);
            const pos = box2d.vec2From(transform.get_p());
            const angle = -transform.get_q().GetAngle();
            const p1 = vec2(1,0), c1 = rgb(.75,0,0,.8);
            const p2 = vec2(0,1), c2 = rgb(0,.75,0,.8);
            drawLine(vec2(), p1, debugLineWidth, c1, pos, angle, false);
            drawLine(vec2(), p2, debugLineWidth, c2, pos, angle, false);